WO2003044997A1

WO2003044997A1 - Wireless receiver

Info

Publication number: WO2003044997A1
Application number: PCT/JP2001/010151
Authority: WO
Inventors: Kenichi Miyoshi; Takahisa Aoyama; Toyoki Ue
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2000-05-25
Filing date: 2001-11-21
Publication date: 2003-05-30
Also published as: JP2001339325A; JP3357653B2

Abstract

A wireless receiver capable of high-accuracy channel estimating and delay profile generating, wherein channel estimating and delay profile detecting are carried out based on not only an individual physical channel (DPCH) but a common channel signal (e.g., down-link shared channel (DSCH)).

Description

Technical field

The present invention relates to a wireless reception apparatus used for a CDMA (Code Division Multiple Access) wireless communication system, and more particularly to channel estimation and @@ 3⁄4 profile

Wireless receiver for generating a loop. Field

'Eye:

Of the conventional CDMA wireless communication systems, digital mobile communication will be described with reference to FIG. 1 and FIG. FIG. 1 is a schematic view showing an example of the appearance of a digital mobile communication system. FIG. 2 is a schematic view showing an example of channel assignment in the digital mobile communication system.

In FIG. 1, as an example, it is shown that the base station 11 performs wireless communication with three mobile stations (ie, mobile station 12 to mobile station 14). Between the base 11 and each of the above mobile stations, the transmission data and control signals are as shown in FIG. 2: DPCH (Dedicated Physical Channel), downlink shear channel (DSCH: Downlink Shared Channel) ) Is sent.

DSCH is a channel for transmitting data (packets) modulated by a high-rate modulation scheme (for example, modulation scheme such as 64 QAM or 16 QAM) to each mobile station in a time division manner. It is possible to change the previous mobile station. The DPCH is a channel for transmitting data such as voice, known signal (PL), and TFCI (Transmit Format Combination Indicator) to each mobile station simultaneously with DSCH.

In order to simplify the following description, a signal transmitted using DSCH is referred to as "DSCH signal", and a signal transmitted using DP CH is referred to as "DPCH signal". Each mobile station performs reception processing as described below. That is, the mobile station uses TFCI in the DP CH signal to recognize which mobile station the DSCH signal is for. Furthermore, this mobile station obtains a demodulated signal by performing despreading processing on the DSCH signal directed to the mobile station.

However, the DSCH signal received by the mobile station includes not only propagation @ ® but also phase fluctuation and amplitude fluctuation (hereinafter simply referred to as “fading fluctuation”) caused by fading or the like. There is. Therefore, the mobile station generates a delay profile using the known signal extracted from the DP CH signal after despreading processing, and detects the reverse ife spreading timing from the generated delay profile. Also, the mobile station performs channel estimation using the extracted known signal, and detects channel variation including phase variation and amplitude variation based on this channel estimation. Furthermore, the mobile station despreads the received signal according to the despreading timing detected as described above, extracts the DSCH signal, and extracts it using the channel estimation value detected as described above. Compensate for fading variations on the DSCH signal. As a result, the mobile station obtains a demodulated signal with reduced fading fluctuation.

In conventional digital mobile communications, it is desirable to perform channel estimation and delay profile generation with higher accuracy. That is, since the base station transmits a DsCH signal using a modulation scheme with a higher rate than the DPCH signal, the mobile station may not respond to the DsCH signal if the channel estimation and delay profile generation accuracy is poor. It is not possible to compensate for the jinging variations with high accuracy, and as a result, the quality of the demodulated signal can not be kept good.

For example, when QPSK modulation is used by the base station, the mobile station can correctly demodulate the received signal if it correctly detects only the phase of the received signal. However, QAM modulation is performed by the base station. If it is used, the mobile station can not correctly demodulate the received signal unless it correctly detects not only the phase but also the amplitude of the received signal.

For these reasons, mobile stations are desired to improve the accuracy of channel estimation and profile generation. Disclosure of the invention

An object of the present invention is to provide a wireless receiver that performs channel estimation and delay profile generation with high accuracy.

The purpose of this is to use a common channel (for example, downlink shielded channel) that is transmitted to stations other than the own station as well as the known signal (pi-port signal) included in the dedicated physical channel (DPCH) signal. It is coupled by performing channel estimation and delay profile generation based on. Brief description of the drawings

Fig. 1 is a schematic view showing an example of the configuration of the digital mobile communication system; Fig. 2 is a schematic view showing an example of channel assignment in the digital mobile communication system

FIG. 3 is a diagram showing the configuration of a mobile station apparatus equipped with the wireless reception apparatus according to the first embodiment of the present invention;

FIG. 4 is a block diagram showing the configuration of a mobile station apparatus provided with a wireless reception apparatus according to a second embodiment of the present invention;

FIG. 5 is a block diagram showing the configuration of a mobile station apparatus provided with a wireless reception apparatus according to a third embodiment of the present invention;

Fig. 6 (A) is a schematic view showing the arrangement of signal points in the Q P S K modulation method; Fig. 6 (B) is a schematic view showing the arrangement of signal points in the 16 Q AM modulation method;

Fig. 6 (C) is a schematic diagram showing the arrangement of signal points in the 64 QAM modulation method.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. (Embodiment 1) Here, as an example, in a mobile communication system as shown in FIG. 1, a mobile station apparatus provided with a wireless reception apparatus according to the following embodiment is a base station apparatus according to the channel assignment as shown in FIG. The case where the wireless communication is performed will be described.

(Embodiment 1)

FIG. 3 is a block diagram showing a configuration of a mobile station apparatus provided with the wireless reception apparatus according to the first embodiment of the present invention. In FIG. 3, DPCH despreading section 102 transmits a signal (received signal) received via antenna 101 to mobile station apparatus according to the despreading timing from delay profile combining section 115 described later. The DPCH signal is extracted by performing despreading using the assigned spreading code.

The PL extraction unit 103 extracts a known signal (“P L” in FIG. 2) from the extracted DP CH signal. The DATA section extraction unit 104 extracts data (“Da ta” in FIG. 2) from the extracted DP CH signal. The TFC I section extraction unit 105 extracts TFC I (“TFCI” in FIG. 2) from the extracted DPCH signal.

DSCH despreading section 116 performs despreading processing using the spreading code assigned to DSCH on the received signal from antenna 101 according to the despreading timing from delay profile combining section 115 described later. Extract the DSC H signal.

The first channel estimation unit 106 performs channel estimation using the extracted known signal and known pie slot pattern. The multiplication unit 107 multiplies the channel estimation value from the channel estimation value combining unit 110 described later and the extracted data. The multiplying unit 108 multiplies the channel estimation value from the channel estimation value combining unit 110 by the extracted TFC I unit. Multiplication section 109 multiplies the extracted DSCH signal by the channel estimation value from channel estimation value combining section 110.

The temporary determination unit 111 performs temporary determination on the multiplication result in the multiplication unit 109. Second channel estimation section 112 performs channel estimation using the extracted DSCH signal and the provisional determination result. The channel estimation value combining unit 110 combines the channel estimation value from the first channel estimation unit 106 and the channel estimation value from the second channel estimation unit 112. The TFCI demodulation unit 117 demodulates the multiplication result in the multiplication unit 108. The switch 118 outputs the multiplication result in the multiplication unit 109 as the DSCH demodulation result based on the demodulation result in the TFCI demodulation unit 117.

The first delay profile generation unit 113 generates a delay profile using the known signal extracted by the PL unit extraction unit 103. The second delay profile generator 114 generates a delay profile file using the DSCH signal extracted by the 03011 despreader 116. The delay profile combining unit 115 combines the delay profile generated by the first delay profile generating unit 113 and the delay profile generated by the second delay profile generating unit 114. Furthermore, the delay file combining unit 115 detects despreading timing using the delay profile after combining, and detects the despreading timing detected in the DP CH despreading unit 102 and the DSCH despreading unit 116 described above. send.

Next, the operation of the mobile station apparatus having the above configuration will be described. Here, as an example, the case of demodulating a D S CH signal of one frame will be described. A signal transmitted by the base station apparatus is received by the antenna 101. The received signal from the antenna 101 is sent to the D P C H despreading unit 102 and the D S C H despreading unit 116.

In the D S CH despreading section 116, the received signal from the antenna 101 is subjected to a despreading process using a spreading code assigned to the DSCH. By this, the DSCH signal is extracted. The despreading processing in the DSCH despreading unit 116 is performed in accordance with the despreading timing from the delay profile combining unit 115. The extracted DSCH signal is sent to the multiplier 109.

The DPC H despreading section 102 despreads the received signal from the antenna 101 using a spreading code assigned to the present mobile station apparatus. By this, the DPCH signal is extracted. The despreading processing in DPCH despreading section 102 is performed according to the despreading timing from delay profile combining section 115. The extracted DP CH signal is sent to the PL unit extraction unit 103, the DATA unit extraction unit 104, and the TFCI unit extraction unit 105. The DATA portion extraction unit 104 extracts a data portion from the extracted DP CH signal and sends the data portion to the multiplication unit 107. In the first part extraction unit 105, the TFCI part is extracted from the extracted DP CH signal and is sent to the multiplication unit 108.

The PL part extraction unit 103 extracts a known signal from the extracted D P CH signal and sends it to the first channel estimation unit 106. The first channel estimation unit 106 performs channel estimation using the extracted known signal and known pilot pattern. The channel estimation result obtained by the first channel estimation unit 106 is sent to the channel estimation value combining unit 110.

The channel estimation value combining unit 110 combines the channel estimation value from the first channel estimation unit 106 and the channel estimation value from the second channel estimation unit 112. At this point, since no channel estimation value is sent from the second channel estimation unit 112, the channel estimation value from the first channel estimation unit 106 is taken as the channel estimation value after combination. After this, the complex estimate of the channel estimation value after synthesis is sent from channel estimation value synthesis section 110 to multiplication section 109.

The multiplication unit 109 multiplies the DSCH signal from the DSCH despreading unit 116 by the complex conjugate from the channel estimation value combining unit 110. This results in a DSCH signal that is compensated for fading variations. Here, the fading fluctuation compensated here corresponds to the one estimated by the channel estimation value from the first channel estimation unit 106 (that is, the channel estimation value based on only the known signal in the DP CH signal). .

A temporary determination unit 111 makes a temporary determination on the DSCH signal in which the feedback fluctuation has been compensated. The DSCH signal after temporary determination is sent to second channel estimation unit 112. Second channel estimation unit 112 includes the DSCH signal after temporary determination from temporary determination unit 111 and the DSCH signal from DSCH despreading unit 116. Channel estimation is performed using and. Here, the DSCH signal after tentative determination is used as a known signal. The channel estimation value obtained by the second channel estimation unit 112 is sent to the channel estimation value combining unit 110. At present, the channel estimation value from the first channel estimation unit 106 described above and the channel estimation value from the second channel estimation unit 112 are input to the channel estimation value combining unit 110. Therefore, in the channel estimation value combining unit 110, the above-mentioned 32 channel estimation values are combined. Thereafter, channel estimated value combining section 110 outputs the complex conjugate of the channel estimation value after combining to multiplying section 1 07 to multiplying section 109. In multiplying section 107, the data from DATA section extracting section 104 And a complex conjugate from the channel estimation value combining unit 110 are multiplied. As a result, data with compensated fading fluctuation can be obtained. This schedule is output as the DPCH demodulation result. The multiplication unit 108 multiplies the TFCI from the TFC I unit extraction unit 105 with the complex conjugate from the channel estimated value synthesis unit 110. This provides TFCI with compensated aging variations. The obtained TFCI is sent to the TFC I demodulator 117.

The TFCI demodulation unit 11 1 demodulates the TFCI from the multiplication unit 108, and determines based on the demodulation result whether or not the D S CH signal has been transmitted to its own station. Furthermore, TFCI demodulation section 117 outputs the DSCH signal from multiplication section 1-9 as the result of the DSC H demodulation only when it is determined that the DSCH signal is transmitted to the local station. A control signal is generated. This control signal is sent to the switch 118 and to the multiplication unit 109 via a path (not shown).

That is, when it is determined that the DSCH signal is transmitted to the local station, multiplying section 109 calculates the DSCH signal from DSCH despreading section 116 and channel estimated value combining section 1 The complex conjugate from 10 is multiplied by This results in a D S CH signal compensated for fading variations. The fading-compensated DSCH signal is output via switch 118 as the D S CH demodulation result.

At this time, the feedback variation compensated by the multiplying unit 107, the multiplying unit 108 and the multiplying unit 109 is the channel estimation value from the channel estimation value combining unit 110 (ie, That is, it corresponds to the one estimated by the known signal in the DPCH signal and the channel estimation value by the DSCH signal.

On the other hand, in parallel with the above-described channel estimation, despreading timings in the DPCH despreading unit 102 and the DSCH despreading unit 116 are detected as described below. First, the known signal extracted by the PL extraction unit 103 is sent to the first delay profile generation unit 113. The DSCH signal extracted by the 03 11 11 despreading unit 116 is sent to the second delay profile generating unit 114.

The first delay profile generation unit 113 generates a delay profile using the known signal. The generated delay profile is sent to the delay profile synthesizer 115. The second delay profile generation unit 114 generates a delay profile using the DSCH signal. The generated delay profile is sent to the delay file combining unit 115.

The delay profile combining unit 115 combines the delay profiles generated by the first delay profile generating unit 113 and the second delay profile generating unit 114. Furthermore, in the synthesized delay profile, the peak whose magnitude is the largest is detected as reverse scatter timing. The detected despreading timing is sent to the DPCH despreading unit 102 and the DSCH despreading unit 116 described above.

Next, the effects of the mobile station apparatus having the above configuration will be described focusing on channel estimation and delay profile generation. First, the effects in channel estimation are explained. In the conventional method, as shown in FIG. 2, while channel estimation is performed using a known signal inserted in the DP CH signal of one frame, in the present embodiment, a channel similar to the conventional method is used. In addition to estimation, channel estimation is performed using DSCH signal. That is, in the present embodiment, the number of data used for channel estimation is significantly increased compared to the conventional method. As a result, highly accurate channel estimation can be performed.

Furthermore, when the period of the flooding variation is shorter than the period corresponding to one frame, the channel estimation accuracy is degraded in the conventional method, but in the present embodiment, DP Since channel estimation is performed using not only a known signal inserted in the CH signal but also a DSCH signal for one frame, the accuracy of channel estimation can be kept good. Next, the effect of delay profile generation will be described. In the ^ method, as shown in FIG. 2, while the delay profile is generated using a known symbol inserted in the DPCH signal of one frame, in the present embodiment, the same method as in the conventional method is used. In addition to the delay profile generation, the DSCH signal is used to perform delay profile generation. That is, in the present embodiment, the delay number used for delay profile generation is significantly increased as compared with the conventional method. As a result, it is possible to detect reverse diffusion timing with high accuracy.

As described above, according to the present embodiment, channel estimation and delay profile generation are performed using not only the DSCH signal transmitted to the own station but also the DSCH signal transmitted to the other station (despreading (despreading). By performing timing detection, it is possible to extract a highly accurate demodulated signal using not only a normal DPC signal but also a DSC signal transmitted using a high rate modulation method.

In the present embodiment, as an example for obtaining the maximum effect, the case where channel estimation and delay profile generation are performed in parallel using known signals and DSCH signals in DPCH signals has been described. It goes without saying that even when either one of the channel estimation and the delay profile generation is applied alone, it is possible to extract a demodulated signal with high accuracy as compared with the conventional method.

Further, in the present embodiment, the base station apparatus uses DPCH to transmit de-tune (such as voice) and various known signals to different mobile stations through different channels. The case has been described where the station apparatus uses the DSCH to transmit a packet (such as a packet) on the same channel to each mobile station apparatus. However, the present invention is not limited to DSCH. In short, channel estimation and delay profile generation may be performed based on common channel signals that may be transmitted to stations other than the own station. The same effect as that of the embodiment can be obtained. The same applies to the embodiments described later. Second Embodiment

In the present embodiment, a case will be described in which only the signal of which received signal exceeds a predetermined threshold among the received S CH signals in the first embodiment is used for channel estimation and delay profile generation.

In the first embodiment described above, all received DSCH signals are used for channel estimation and delay profile generation. However, the received DSCH signal contains a signal whose receiving noise is decreasing due to the effect of fading. There is a high possibility that the judgment result of the D S CH signal such that the reception power is small includes an error. If such a DSC H signal is used for channel estimation and delay profile generation, the accuracy of the extracted demodulated signal will be degraded.

Therefore, in the present embodiment, among the received DSCH signals, only signals whose reception power exceeds a predetermined threshold are used for channel estimation and delay profile generation. The radio receiving apparatus according to the present embodiment will be described below with reference to FIG.

FIG. 4 is a block diagram showing a configuration of a mobile station apparatus provided with a wireless reception apparatus according to a second embodiment of the present invention. The same components in FIG. 4 as those in Embodiment 1 (FIG. 3) will be assigned the same reference numerals as in FIG. 3 and detailed explanations thereof will be omitted.

In FIG. 4, the performance calculation unit 201 calculates the received power (power) of the DSCH signal from the DSCH despreading unit 116, and compares the calculated received power with a predetermined threshold. The patch calculation unit 201 controls a switch 202 and a switch 203, which will be described later, based on the comparison result. That is, when the calculated reception power is larger than the threshold, the performance calculation unit 201 controls the switch 202 so as to output the channel estimation value from the second channel estimation unit 112 to the channel estimation value synthesis unit 110. The switch 203 is controlled to output the delay profile from the second delay profile generator 114 to the mute file synthesizer 115. Conversely, if the calculated reception power is less than or equal to the threshold value, the performance calculation unit 201 determines the second channel. While controlling the switch 202 so as not to output the channel estimation value from the estimation unit 112 to the channel estimation value combining unit 110, it is also possible not to output the delay profile from the second delay profile generation unit 114 to the delay profile combining unit 115. Control the switch 203.

The switch 202 and the switch 203 perform output switching of the channel estimation value and the delay profile based on the control by the above-described power calculation unit 201.

As described above, according to the present embodiment, only signals whose received power exceeds a predetermined threshold among the received DSCH signals are used for channel estimation and delay profile generation, whereby DSCH reception due to the influence of fading is realized. Even when there is a possibility that the power loss will be small, a highly accurate demodulated signal can be extracted.

Embodiment 3

In the present embodiment, among the received DSCH signals in the first embodiment, a DSCH signal in which a modulation scheme having a smaller modulation multi-value number is used, and the reception power exceeds a predetermined threshold. The case where only DSCH signals are used for channel estimation and delay profile generation will be described.

In general, the base station apparatus uses high-speed data such as QPSK (see FIG. 6 (A)), 16 Q AM (see FIG. 6 (B)) or 64 QAM (see FIG. 6 (C)). Transmit as DSCH signal. The mobile station apparatus accurately determines that amplitude information is not accurately detected for a DS CH signal using the 16 QAM scheme or the 64 QAM scheme on the condition that the DS CH signal is received with the same average received power. On the other hand, for the DSCH signal in which the QP SK method is used, accurate provisional determination can be performed if only phase information is accurately detected.

Therefore, in the present embodiment, in order to perform channel estimation and delay profile generation with higher accuracy, it is a DS CH signal in which a modulation scheme with a smaller modulation multi-level number is used, and the reception power is a predetermined value. Only DSCH signals that exceed the threshold are used for channel estimation and delay profile generation. This enables channel estimation and delay profile generation with high accuracy. The radio receiving apparatus according to the present embodiment will be described below with reference to FIG. FIG. 5 is a block diagram showing a configuration of a mobile station apparatus provided with a wireless reception apparatus according to a third embodiment of the present invention. The same components in FIG. 5 as those in Embodiment 1 (FIG. 3) can be assigned the same reference numerals as those in FIG. 3 and detailed explanations thereof can be omitted.

In FIG. 5, the performance calculation unit 201 calculates the reception performance of the DSCH signal from the DSCH despreading unit 116 as in the second embodiment, and compares the calculated reception performance with a predetermined threshold value. The performance calculation unit 201 outputs the comparison result to the determination unit 302. The modulation scheme detection unit 301 detects the modulation scheme used for the D S C H signal from the D S C H despreading unit 116, and outputs the detection result to the determination unit 302.

The determination unit 302 controls the switch 202 and the switch 203 based on the comparison result from the threshold calculation unit 201 and the detection result from the modulation scheme detection unit 301. That is, the determination unit 302 uses a modulation scheme with high received power exceeding a predetermined threshold value (that is, a modulation scheme with a smaller number of modulation levels (eg, QPSK scheme)): only the DSCH signal Control switch 202 and switch 203 so that they are used for channel estimation and delay profile generation. In other words, the determination unit 302 controls the switches 202 and 203 so that channel estimation and delay profile generation can be performed using only the DSCH signal that can make a tentative determination more accurately. The specific operations of the switch 202 and the switch 203 are the same as those described in the second embodiment.

As described above, according to the present embodiment, among the received DSCH signals, the DSCH signal is a DSCH signal in which a modulation scheme with a smaller number of modulations is used, and the reception power has exceeded a predetermined threshold! By using only the SCH signal for channel estimation and delay profile generation, a more accurate demodulated signal can be extracted. In this embodiment, although the case of detecting the modulation scheme using the extracted DSCH signal has been described as an example, when the information for notifying the modulation scheme is included in the TFCI, the TFCI demodulation result is used. Modulation scheme can be detected. 1

13 Furthermore, the present invention is not limited to the embodiments described above, and can be implemented with various modifications.

The radio receiving apparatus according to the present invention comprises: despreading means for despreading a common channel signal; channel estimation means for obtaining a channel estimate based on the reverse spread common channel signal; and despreading based on the determined channel estimate. And demodulation means for performing propagation path compensation on the spread signal to demodulate the reception signal.

According to this configuration, since the channel estimation value is obtained using a common channel signal with a large number of data, it is possible to perform channel estimation with high accuracy. As a result, propagation path compensation can be performed on the received signal with high accuracy to obtain a high quality demodulated signal. The radio receiving apparatus according to the present invention further comprises: a despreading means for despreading the common channel signal; and a «profile generation means for generating a delay profile based on the despread signal, the despreading means comprising The despreading process is performed at the timing based on the delay profile.

According to this configuration, since the delay profile is generated using the common channel signal with a large number of data, it is possible to generate a high-precision delay profile. As a result, the despreading process can be performed at the despreading timing with high accuracy, so that a high quality demodulated signal can be obtained.

The wireless receiving apparatus according to the present invention further comprises: a temporary judgment means for provisionally judging the common channel signal after propagation path compensation, and the channel estimation means regards the provisional judgment result as a known signal and a signal before the propagation path compensation. The channel estimation value is obtained by comparing with.

According to this configuration, channel estimation values can be easily obtained. The radio receiving apparatus according to the present invention determines the first channel estimation value based on the despreading means for despreading the dedicated physical channel signal and the common channel signal addressed to the own station, and the dedicated physical channel signal after the despreading. A first channel estimation means, a second channel estimation means for obtaining a second channel estimate value based on the despread common channel signal, and a combined channel estimate combining the first and second channel estimate values. Combining means for obtaining values, and despreading individual physical channel signals and common channels after despreading based on the combined channel values And demodulation means for propagation path compensation and demodulation of the loop signal.

According to this configuration, since the combined channel estimation value is obtained using the dedicated physical channel signal and the common channel signal, it becomes a very accurate channel estimation value based on a very large number of signals. As a result, propagation path compensation can be performed on the received signal with high accuracy to obtain a high quality demodulated signal.

Further, the wireless reception device of the present invention generates a first delay profile based on the despreading means for despreading the dedicated physical channel signal and common channel signal addressed to the own station, and the dedicated physical channel signal after despreading. A first delay profile generating means, a second delay profile generating means for generating a second delay profile based on the despread common channel signal, and a combined delay obtained by combining the first and second delay profiles. The despreading means is configured to perform despreading processing at a timing based on the combined delay profile.

According to this configuration, the combined delay profile is generated using the dedicated physical channel signal and the common channel signal, resulting in a very accurate delay profile based on a very large number of signals. As a result, since despreading processing can be performed with high precision despreading timing, a high quality demodulated signal can be obtained. The wireless receiving apparatus according to the present invention further comprises: a temporary judging means for provisionally judging the common channel signal after propagation path compensation, and the second channel estimation means regards the provisional judgment result as a known signal and carries out a propagation path compensation. The second channel estimated value is obtained by comparing with the previous signal.

According to this configuration, the second channel estimation value can be easily obtained.

The wireless receiving apparatus according to the present invention further comprises reliability detection means for detecting the reliability of the common channel signal after despreading, and the combining means is operable to execute the first method when the reliability exceeds a predetermined threshold. A combined channel estimation value is determined by combining the first and second channel estimation values, and the first channel estimation value is used as a combined channel estimation value when the reliability is less than or equal to a predetermined threshold.

According to this configuration, for example, the received common channel signal is affected by fading. If the reliability is low due to the use of a common channel signal for channel estimation, then the dedicated physical channel only needs to be used, taking into account that the accuracy of the channel estimation value may deteriorate. By using channel estimation, the best channel estimation can be performed according to the channel state.

The wireless receiving apparatus according to the present invention further comprises reliability detection means for detecting the reliability of the common channel signal after despreading, and the combining means is operable to execute the first method when the reliability exceeds a predetermined threshold. The first and second delay profiles are combined to obtain a combined delay profile, and when the reliability is less than a predetermined threshold value, the first delay profile file is used as the combined delay profile.

According to this configuration, for example, when the received common channel signal has low reliability due to the influence of fading, the accuracy of the despreading timing may be degraded if the common channel signal is used for setting the despreading timing. In such a case, it is possible to determine the best despreading timing according to the channel condition by determining the despreading timing using only the dedicated physical channel in consideration of the possibility of such a situation. The communication terminal apparatus according to the present invention is a communication terminal apparatus having a wireless receiving apparatus, and the wireless receiving apparatus comprises channel estimation based on despreading means for despreading the common channel signal, and the common channel signal after despreading. A channel estimation means for obtaining a value, and a demodulation means for demodulating the reception signal by propagation path compensation for the despread signal based on the obtained channel estimation value are adopted.

According to this configuration, since it is possible to perform propagation channel compensation with high accuracy based on the channel estimation value with high accuracy, it is possible to realize a communication terminal apparatus that can obtain a high quality demodulated signal.

The communication terminal apparatus of the present invention is a communication terminal apparatus having a wireless receiving apparatus, and the wireless receiving apparatus generates a delay profile based on the despreading means for despreading the common channel signal, and the despread signal. And a despreading unit configured to perform despreading processing at a timing based on the delay profile.

According to this configuration, the high accuracy despreading timing is obtained based on the high accuracy delay profile. Since the despreading process can be performed by the ringing, it is possible to realize a communication terminal that can obtain a high quality demodulated signal.

As described above, according to the present invention, by performing channel estimation and delay profile detection based on a common channel signal, it is possible to perform channel estimation and delay profile generation with high accuracy. Can be realized. This specification is based on Japanese Patent Application No. 2000-155372 filed on May 25, 2000. All this content is included here. Industrial applicability

The present invention can be applied to a wireless receiver performing channel estimation and delay profile generation among wireless receivers used in a CDMA wireless communication system.

Claims

The scope of the claims

1. A despreading means for despreading the common channel signal, a channel estimation means for obtaining a channel estimation value based on the despreading common channel signal, and a despreading signal based on the obtained channel estimation value A radio receiving apparatus comprising: demodulation means for performing channel compensation and demodulating a received signal.

2. A despreading means for despreading the common channel signal, and a delay profile generating means for producing a delay profile based on the despread signal, the despreading means comprising: timing based on the delay profile A radio receiver characterized in that despreading processing is performed.

3. A temporary determination means for temporarily determining the common channel signal after propagation path compensation is further provided, and the channel estimation means regards the temporary determination result as a known signal and compares it with the signal before propagation path compensation. The value is determined as described in claim 1.

4. The wireless receiver according to claim 1, wherein the common channel signal is a downlink shared channel signal.

5. The wireless receiving apparatus according to claim 2, wherein the common channel signal is a downlink shared channel signal.

6. The method further comprises a profile generation means for generating a delay profile based on the signal after despreading, wherein the despreading means performs despreading processing at timing based on the delay profile. The wireless reception device according to Item 1.

7. First channel estimation means for obtaining a first channel estimation value based on the despreading means for despreading the dedicated physical channel signal and the common channel signal addressed to the own station, and the dedicated physical channel signal after the despreading And second channel estimation means for obtaining a second channel estimate value based on the despread common channel signal, and combining means for obtaining a combined channel estimate value combining the first and second channel estimate values. And a demodulation unit for performing channel compensation and demodulation on the individual physical channel signal and the common channel signal after despreading based on the combined channel value.

8. Despreading means for despreading the dedicated physical channel signal and common channel signal for the own station Stage, first delay profile generation means for generating a first delay profile based on the despread individual physical channel signal, and second delay profile based on the despread common channel signal. And second synthesizing means for generating a second delay profile generating means; and synthetic means for obtaining a synthetic delay profile obtained by synthesizing the first and second delay profiles, wherein the despreading means is a tie based on the synthetic delay profile. And performing despreading processing at the same time.

9. A first delay profile generating means for generating a first delay profile isolation based on the despread individual physical channel signal, and a second delay profile for generating a second delay profile based on the despread common channel signal. And a combining means for obtaining a combined delay profile combining the first and second delay profiles, and the despreading means performs a despreading process at a timing based on the combined delay profile. The wireless receiving device according to claim 7, characterized in that.

1 0. A temporary determination means for temporarily determining the common channel signal after propagation path compensation is further provided, and the second channel estimation means considers the temporary determination result as a known signal and compares it with the signal before propagation path compensation. The radio receiving apparatus according to claim 7, wherein the second channel estimation value is obtained by performing the processing.

1 1. A reliability detection means for detecting the reliability of the common channel signal after despreading is further provided, and the combining means is configured to estimate the first and second channel when the reliability exceeds a predetermined threshold. The combined channel estimation value is determined by combining the values, and the first channel estimation value is set as a combined channel estimation value when the reliability is less than a predetermined threshold value. Wireless receiver.

1 2. A reliability detection means for detecting the reliability of the common channel signal after despreading is further provided, and the combining means is configured to calculate the first and second delay profiles when the reliability exceeds a predetermined threshold. 9. The combined delay profile according to claim 8, wherein the combined delay profile is determined by combining the files, and the first delay profile is set as a combined delay profile when the reliability is less than a predetermined threshold. Wireless receiver.

The wireless receiver according to claim 12, wherein the reliability detection means detects the reliability based on the power of the common channel signal after despreading.

The wireless reception device according to claim 12, wherein the reliability detection means detects the reliability based on the power of the common channel signal after despreading.

The wireless receiving apparatus according to claim 12, wherein the reliability detection means detects the reliability based on a modulation scheme of the common channel signal.

The wireless receiver according to claim 12, wherein the reliability detection means detects the reliability based on a modulation scheme of the common channel signal.

A communication terminal apparatus having a wireless receiving apparatus, the wireless receiving apparatus comprising: despreading means for despreading the common channel signal; and channel estimation for obtaining a channel estimate based on the despread common channel signal. A communication terminal apparatus comprising: means; and demodulation means for performing channel compensation on a despread signal based on the determined channel estimation value to demodulate a received signal.

A communication terminal apparatus having a wireless receiving apparatus, wherein the wireless receiving apparatus includes: despreading means for despreading the common channel signal; and delay profile generation for generating a delay profile based on the despread signal. And the despreading means performs despreading processing at a timing based on the delay profile.

The wireless receiver according to claim 17, wherein the common channel signal is a downlink shared channel signal.

20. The wireless receiving apparatus according to claim 18, wherein the common channel signal is a downlink shared channel signal.