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WO2017036161A1 - Appareil et procédé de filtrage auto-adaptatif - Google Patents

Appareil et procédé de filtrage auto-adaptatif Download PDF

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Publication number
WO2017036161A1
WO2017036161A1 PCT/CN2016/081167 CN2016081167W WO2017036161A1 WO 2017036161 A1 WO2017036161 A1 WO 2017036161A1 CN 2016081167 W CN2016081167 W CN 2016081167W WO 2017036161 A1 WO2017036161 A1 WO 2017036161A1
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Prior art keywords
interference ratio
filtering
channel
adjacent
interference
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PCT/CN2016/081167
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English (en)
Chinese (zh)
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刘兵
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中兴通讯股份有限公司
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Publication of WO2017036161A1 publication Critical patent/WO2017036161A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

Definitions

  • This document relates to, but is not limited to, the field of wireless communications, and relates to an adaptive filtering method and apparatus.
  • wireless interference is diverse.
  • a useful device transmits a useful signal, due to the limitation of the device itself and the out-of-band rejection of the filter, unwanted signals such as spurious, harmonic, and intermodulation are generated outside the operating band, and these signals fall to other wireless systems.
  • unwanted signals such as spurious, harmonic, and intermodulation are generated outside the operating band, and these signals fall to other wireless systems.
  • the working frequency band it will form interference, usually including adjacent channel interference and co-channel interference.
  • Narrowband communication systems such as GSM (Global System for Mobile Communication) do not configure adjacent carriers in the same cell. When a cell is configured with adjacent carriers, frequency hopping is used to resolve mutual interference of adjacent frequencies. ).
  • Broadband communication system such as E-UTRAN (Evolved Universal Terrestrial Radio Access Network) 20M carrier bandwidth, useful carrier only accounts for 18MHz bandwidth, and each side has a 1MHz bandwidth for carrier Inter-isolation protection reduces inter-carrier interference.
  • the guard interval of the carrier should also be considered between different wireless standards. Due to limited spectrum resources, in order to improve spectrum utilization, the guard interval between carriers is often reduced, resulting in adjacent channel interference. For example, between adjacent cells, there may be interference of adjacent frequencies. The frequency band spacing between different modes is reduced. Especially for the base station receiver, since the signal level range of the user equipment (UE, User Equipment) to the base station receiver is large, the adjacent frequency interference may be severe, which may seriously affect the reception performance.
  • UE User Equipment
  • the channel filter adopts a relatively fixed filtering mode to filter the carrier data to filter out-band interference.
  • the filter mode adopted by the channel filter is fixed, and its passband performance and out-of-band rejection performance are fixed.
  • the performance of the channel filter is a compromise result, which inevitably leads to the inability to achieve optimal filtering performance in all interference scenarios. .
  • the channel filter of the fixed filtering mode will lose more useful carrier signals and cannot obtain the best reception performance.
  • the filter of the fixed filtering mode does not suppress the adjacent channel interference, and can not obtain higher reception. performance.
  • the embodiment of the invention provides an adaptive filtering method and device, which solves the problem that the channel filter has poor filtering performance caused by adopting a fixed filtering mode for different interference scenarios.
  • An embodiment of the present invention discloses an adaptive filtering method, where the adaptive filtering method includes:
  • the wideband digital signal is channel filtered using the channel filtering mode.
  • acquiring an interference ratio of the wideband digital signal to be subjected to filtering processing includes:
  • the interference ratio includes an adjacent frequency interference ratio.
  • the channel filtering mode that matches the filtering performance according to the interference ratio setting and the interference ratio includes:
  • the preset neighboring interference ratio threshold includes a first preset adjacent interference ratio threshold and a second preset adjacent interference ratio threshold;
  • the channel filtering mode that determines that the filtering performance matches the adjacent frequency interference ratio according to the comparison result includes:
  • the adjacent-channel interference ratio is greater than or equal to the first preset adjacent-channel interference ratio threshold and less than or equal to the second preset adjacent-channel interference ratio threshold, setting the filtering performance to be out-of-band in the performance of the medium passband Channel filtering mode that suppresses performance;
  • the channel filtering mode with the filtering performance being the high pass band performance is set.
  • An embodiment of the present invention further provides an adaptive filtering apparatus, where the adaptive filtering apparatus includes: an interference ratio acquiring unit, a filtering mode setting unit, and a channel filtering unit;
  • the interference ratio acquisition unit is configured to acquire an interference ratio of the wideband digital signal to be subjected to filtering processing
  • the filtering mode setting unit is configured to set a channel filtering mode in which a filtering performance matches the interference ratio according to the interference ratio;
  • the channel filtering unit is configured to perform channel filtering on the wideband digital signal by using the channel filtering mode.
  • the interference ratio obtaining unit includes: a signal processing module and an interference ratio calculating module;
  • the signal processing module is configured to intercept at least one segment as a sample wideband digital signal from the wideband digital signal to be subjected to filtering processing;
  • the interference ratio calculation module is configured to extract an in-band signal and an interference signal of the sample wideband digital signal, calculate a power of the in-band signal and a power of the interference signal, and compare the power of the in-band signal with the The ratio of the power of the interference signal is taken as the interference ratio.
  • the interference ratio calculation module includes an adjacent frequency interference ratio calculation submodule, where the interference ratio includes an adjacent frequency interference ratio, and the adjacent frequency interference ratio calculation submodule is configured to extract the inband of the sample wideband digital signal.
  • the signal and the adjacent-frequency interference signal calculate the power of the in-band signal and the power of the adjacent-frequency interference signal, and the ratio of the power of the in-band signal to the power of the adjacent-frequency interference signal is used as an adjacent-channel interference ratio.
  • the filtering mode setting unit includes an adjacent frequency interference filtering setting module, and the adjacent frequency interference filtering setting module is configured to compare the adjacent frequency interference ratio with a preset adjacent frequency interference ratio threshold. Comparing, the adjacent channel interference channel filtering mode in which the filtering performance matches the adjacent frequency interference ratio is determined according to the comparison result.
  • the preset neighboring interference ratio threshold includes a first preset adjacent interference ratio threshold and a second preset adjacent interference ratio threshold; and the adjacent interference filtering setting module is determined according to the comparison result by: Channel filtering mode with filtering performance matching the adjacent frequency interference ratio:
  • the channel filtering mode with the filtering performance being high out-of-band rejection performance is set;
  • the adjacent-channel interference ratio is greater than or equal to the first preset adjacent-channel interference ratio threshold, and is less than or equal to the second preset adjacent-channel interference ratio threshold, setting a filtering performance to a medium passband performance Channel filtering mode with out-of-band rejection performance;
  • the channel filtering mode with the filtering performance being the high pass band performance is set.
  • the embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium stores computer executable instructions, and the computer executable instructions are implemented to implement an adaptive filtering method.
  • An embodiment of the present invention provides an adaptive filtering method and apparatus, which acquires an interference ratio of the wideband digital signal, that is, an interference condition of the wideband digital signal, before the obtained wideband digital signal is filtered;
  • the interference of the digital signal is set to a channel filtering mode in which the filtering performance matches the interference ratio; the wideband digital signal is filtered based on a channel filtering mode set in real time. It can be seen that, before filtering the obtained wideband digital signal, the embodiment of the present invention matches a filtering mode with the most suitable filtering performance in real time according to the current interference ratio of the current wideband digital signal, that is, according to the current filtering process.
  • the signal interference condition is adaptively matched to the optimal filtering mode. It is not uniformly filtered by the fixed filtering mode with performance compromise, and better filtering performance can be obtained.
  • FIG. 1 is a schematic flowchart of an adaptive filtering method according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic flowchart of acquiring an interference ratio according to Embodiment 1 of the present invention
  • Embodiment 3 is a system block diagram of a wideband receiver in Embodiment 2 of the present invention.
  • FIG. 4 is a schematic structural diagram of an adaptive filtering apparatus according to Embodiment 2 of the present invention.
  • FIG. 5 is another schematic structural diagram of an adaptive filtering apparatus according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of an adaptive filtering apparatus according to Embodiment 3 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the adaptive filtering method provided by this embodiment is applicable to various application scenarios, and is particularly suitable for processing a received wireless signal by a wideband receiver.
  • the application of the wideband receiver will be described below as an example.
  • the basic process of receiving a processed signal by a wideband receiver is: receiving a radio frequency signal, performing analog-to-digital conversion on the wideband digital signal, performing channel filtering on the obtained wideband digital signal, and obtaining a digital baseband signal, and then receiving the digital baseband information. Demodulation and decoding processing.
  • a filtering method capable of improving filtering performance is proposed for the channel filtering processing link in the above processing flow. The following examples are as follows:
  • the present embodiment does not immediately perform channel filtering processing, but first acquires the interference condition of the wideband digital signal.
  • the interference ratio of the wideband digital signal can be characterized by the interference ratio, and then According to the obtained interference condition, the filtering mode with the most matching filtering performance is set in real time for the wideband digital signal, and then the corresponding channel filter is used to filter the wideband digital signal by using the filtering mode.
  • the obtained wideband digital signal may be subjected to delay processing, and the filtering mode is set in the delay, and the specific time value of the delay may be It is set in accordance with the time required to complete the setting process of the above filter mode.
  • FIG. 1 The process of adaptive filtering in this embodiment is shown in FIG. 1 and includes:
  • Step 101 Acquire a wideband digital signal interference ratio to be filtered
  • Step 102 Set a channel filtering mode that matches a filtering performance and the interference ratio according to the interference ratio.
  • Step 103 Perform channel filtering on the wideband digital signal by using the set channel filtering mode.
  • the channel filtering in this embodiment may filter the adjacent channel interference of the signal, but is not limited to filtering for the adjacent channel interference of the signal.
  • the interference ratio includes an adjacent frequency interference ratio.
  • acquiring the interference ratio of the wideband digital signal to be filtered includes:
  • Step 201 intercepting at least one segment from the wideband digital signal to be subjected to filtering processing as a sample wideband digital signal;
  • the number of interception in this step can be flexibly selected according to specific application scenarios (such as requirements for accuracy and real-time requirements for filtering processing), and a segment of a preset length can be intercepted as a sample wideband digital signal in a bandwidth digital signal period.
  • a segment of a preset length can be intercepted as a sample wideband digital signal in a bandwidth digital signal period.
  • the interference situation provides a better basis for the setting of the subsequent interference mode; the wideband digital signal of the entire period can also be directly intercepted as the sample bandwidth digital signal, so as to accurately characterize the interference situation.
  • Step 202 Extract an in-band signal and an adjacent-frequency interference signal of the sample wideband digital signal.
  • the extraction method of the in-band signal and the adjacent-frequency interference signal may be extracted by using a corresponding filter, or may be extracted by any other effective method.
  • Step 203 Calculate the power of the in-band signal and the power of the adjacent-frequency interference signal, and use the ratio of the power of the in-band signal to the power of the adjacent-frequency interference signal as the adjacent-channel interference ratio.
  • the obtained adjacent channel interference ratio may be compared with the corresponding adjacent channel interference ratio threshold in the foregoing step 102, so that the channel filtering mode in which the filtering performance matches the adjacent frequency interference ratio is set according to the comparison result.
  • the number of interference ratio thresholds can be flexibly set according to requirements, for example, it can be set to one, and a relatively coarse division of the interference scene can be performed, or multiple settings can be set to perform a more precise fine on the interference scene. Minute.
  • the following embodiment is exemplified by setting the preset adjacent channel interference ratio threshold to two.
  • the preset adjacent channel interference ratio threshold set at this time includes a first preset adjacent channel interference ratio threshold and a second preset adjacent channel interference ratio threshold (the second preset adjacent channel interference ratio threshold is greater than the first preset adjacent channel interference ratio) Threshold), comparing the obtained adjacent channel interference ratio with a preset first set adjacent channel interference ratio threshold and a second preset adjacent channel interference ratio threshold, and setting a corresponding channel filtering mode according to the comparison result, as follows:
  • the filtering performance is high.
  • the out-of-band adjacent-frequency interference is generally indicated, so filtering is set.
  • the performance is a channel filtering mode with out-of-band rejection performance in the performance of the medium pass band;
  • the outband adjacent channel interference is weak, which is a low adjacent frequency interference scenario, and sufficient passband performance is required to minimize the useful carrier.
  • the signal is lost, so the filtering performance is set to the channel filtering mode of the high pass band performance.
  • the channel filtering mode in this embodiment is mainly for different filtering performances, that is, the corresponding filter coefficients are correspondingly adjusted to meet different filtering performances, and different filtering performances are corresponding. Different filtering modes.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the adaptive filtering device in this embodiment can be used in various application scenarios, and is suitable for processing a received wireless signal by a wideband receiver.
  • the application of the wideband receiver will be described below as an example.
  • FIG. 3 is a schematic structural diagram of a wideband receiver, which includes an antenna 11, an RF channel 12, an ADC (Analog-to-Digital Converter) module 13, a digital intermediate frequency module 14, and a baseband.
  • Module 15 the signal processing process is:
  • the RF channel 12 receives the RF signal through the antenna 11 and performs analog filtering, amplification, and frequency shifting to obtain an analog intermediate frequency or baseband signal, and the ADC module 13 performs analog-to-digital conversion on the analog intermediate frequency or baseband signal to obtain a wideband digital intermediate frequency signal, which is provided to Digital intermediate frequency module 14.
  • the digital intermediate frequency module 14 performs channel filtering and the like on the wideband digital intermediate frequency signal to obtain a digital baseband signal of the carrier, and the baseband module 15 performs processing such as reception demodulation and decoding.
  • a filtering device capable of improving filtering performance is proposed mainly for the channel filtering processing link in the above processing flow.
  • the following examples are as follows:
  • the present embodiment does not immediately perform channel filtering processing, but first acquires the interference condition of the wideband digital signal.
  • the interference ratio can be used to characterize the interference of the wideband digital signal, and then according to the obtained
  • the interference condition is that the wideband digital signal sets the filtering mode with the most matching filtering performance in real time, and then the corresponding channel filter uses the filtering mode to filter the wideband digital signal.
  • the obtained wideband digital signal may be subjected to delay processing by the delay unit, and the filtering mode is set in the delay, and the specific time value of the delay may be completed according to the above.
  • the setting process of the filter mode is set by the time required.
  • the adaptive filtering apparatus of this embodiment includes an interference ratio acquiring unit 21, a filtering mode setting unit 22, and a channel filtering unit 23.
  • the interference ratio acquisition unit 21 is configured to acquire an interference ratio of the wideband digital signal to be subjected to the filtering process
  • the filter mode setting unit 22 is configured to set a channel filtering mode of the wideband digital signal according to the interference ratio
  • the channel filtering unit 23 is configured to perform channel filtering on the wideband digital signal by using the channel filtering mode
  • the device further includes: a delay unit 24 configured to perform delay processing on the obtained wideband digital signal, and complete setting of the filtering mode in a delay, and the time value of the delay unit 24 may be completed according to the completion.
  • the setting process of the above filter mode is set by the time required.
  • the channel filtering in this embodiment may filter the adjacent channel interference of the signal, but is not limited to filtering for the adjacent channel interference of the signal.
  • the interference ratio acquisition unit 21 further includes a signal processing module 211 and an interference ratio calculation module 212.
  • the signal processing module 211 is configured to intercept at least one segment from the wideband digital signal to be subjected to filtering processing. Sample wideband digital signal; it should be understood that the number of intercepts can be flexibly selected according to specific application scenarios (such as requirements for accuracy and real-time requirements for filtering processing), and the preset length can be intercepted in the wideband digital signal period.
  • the interference ratio calculation module 212 is configured to extract the in-band signal and the interference signal of the sample wideband digital signal, calculate the power of the in-band signal and the power of the interference signal, and use the ratio of the power of the in-band signal to the power of the interference signal as Interference ratio.
  • the interference ratio calculation module 212 in this embodiment includes an adjacent frequency interference signal processing sub-module, and the interference ratio includes an adjacent frequency interference ratio; the adjacent frequency interference signal processing sub-module is configured to extract an in-band signal and an adjacent frequency of the sample wideband digital signal.
  • the interference signal calculates a power of the in-band signal and a power of the adjacent-frequency interference signal, and uses a ratio of a power of the in-band signal to a power of the adjacent-frequency interference signal as an adjacent-channel interference ratio.
  • the filtering mode setting unit 22 in this embodiment includes an adjacent frequency interference filtering setting module, and the adjacent frequency interference filtering setting module is configured to set the adjacent frequency interference ratio to a preset neighbor when the interference ratio includes an adjacent frequency interference ratio.
  • the frequency interference is compared with the threshold, and the adjacent channel interference channel filtering mode whose filtering performance matches the adjacent frequency interference ratio is determined according to the comparison result.
  • the number of the interference ratio thresholds in this embodiment can be flexibly set according to the requirements. For example, it can be set to one.
  • the interference scene can be divided into a rougher one, or multiple, to accurately compare the interference scene. Subdivision.
  • the following embodiment is exemplified by setting the preset adjacent channel interference ratio threshold to two.
  • the preset adjacent channel interference ratio threshold set at this time includes a first preset adjacent channel interference ratio threshold and a second preset adjacent channel interference ratio threshold (the second preset adjacent channel interference ratio threshold is greater than the first preset adjacent channel interference ratio) Threshold).
  • the channel filtering mode with the filtering performance being high out-of-band rejection performance is set;
  • the filtering performance is set to the medium-passband performance.
  • the channel filtering mode with the filtering performance being the high pass band performance is set.
  • the interference ratio obtaining unit 61 includes a signal processing module 611 and an interference ratio calculating module 612.
  • the signal processing module 611 is configured to intercept at least one segment from the wideband digital signal as a sample wideband digital signal. It should be understood that the number of interceptions can be flexibly selected according to specific application scenarios (such as requirements for accuracy and real-time requirements for filtering processing), and a segment of a preset length can be intercepted as a sample bandwidth during the period of the wideband digital signal.
  • Digital signal as long as the sampled wideband digital signal intercepted can effectively characterize the interference of the wideband digital signal; or two or more segments of the wideband digital signal can be intercepted as a sample wideband digital signal for more accurate characterization
  • the interference condition of the wideband digital signal provides a better basis for the setting of the subsequent interference mode; the wideband digital signal of the entire period can also be directly intercepted as the sample bandwidth digital signal, so as to accurately characterize the interference situation.
  • the interference ratio calculation module 612 is configured to extract an in-band signal and an interference signal of the sample wideband digital signal, calculate a power of the in-band signal and a power of the interference signal, and compare the power of the in-band signal with the The ratio of the power of the interference signal is used as the interference ratio.
  • the interference ratio calculation module 612 includes an adjacent interference ratio calculation submodule 6121, the interference ratio includes an adjacent frequency interference ratio, and the adjacent frequency interference ratio calculation submodule 6121 is configured to extract the sample wideband digital signal. In-band signal and adjacent-frequency interference signal, calculating a power of the in-band signal and a power of the adjacent-frequency interference signal, and using a ratio of a power of the in-band signal to a power of the adjacent-frequency interference signal as an adjacent frequency Interference ratio.
  • the adjacent-frequency interference ratio calculation sub-module 6121 includes a first low-pass filter configured to extract an in-band signal of the sample wideband digital signal, and the adjacent-frequency interference ratio calculation sub-module 6121 further includes a second a low pass filter (or first band pass filter) configured to extract a left adjacent frequency interference signal after the spectrum is shifted right in the sample wideband digital signal, the adjacent frequency interference ratio calculation submodule 6121 including a third low pass A filter (or a second band pass filter) is arranged to extract a right adjacent frequency interference signal after the left shift of the spectrum in the sample wideband digital signal.
  • the filtering mode setting unit 62 in this embodiment includes an adjacent frequency interference filtering setting module 621, and the adjacent frequency interference filtering setting unit 621 is configured to compare the adjacent frequency interference ratio when the interference ratio includes an adjacent frequency interference ratio. Comparing with the preset adjacent-channel interference ratio threshold, determining, according to the comparison result, the adjacent-frequency interference channel filtering mode in which the filtering performance matches the adjacent-frequency interference ratio;
  • the number of adjacent interferences in the present embodiment can be flexibly set according to the requirements of the threshold, for example, it can be set to one, and a relatively coarse division of the interference scene can be performed, or multiple settings can be performed to perform an interference scenario. More precise subdivision.
  • the preset adjacent-channel interference ratio threshold in the adjacent-frequency interference filtering setting sub-unit is compared with the adjacent-frequency interference ratio, and the channel filtering mode in which the filtering performance matches the adjacent-frequency interference ratio is determined according to the comparison result.
  • the adjacent channel interference ratio threshold when the adjacent channel interference ratio threshold is set to two, the first adjacent channel interference ratio threshold and the second adjacent channel interference ratio threshold may be set, and the second adjacent channel interference ratio threshold is greater than the first neighbor. Frequency interference ratio threshold.
  • the channel filtering mode with the filtering performance being high out-of-band rejection performance is set; when the comparison result is that the adjacent-frequency interference ratio is greater than or When the first preset adjacent channel interference ratio threshold is equal to or less than or equal to the second preset adjacent channel interference ratio threshold, the channel filtering mode with the filtering performance being the outband suppression performance in the middle passband performance is set; As a result, when the adjacent-channel interference ratio is greater than the second preset adjacent-channel interference ratio threshold, the channel filtering mode in which the filtering performance is high-passband performance is set.
  • the channel filtering unit 63 in this embodiment includes a filter 631 for filtering, and the channel filtering unit 63 is provided with at least one filter 631 whose filter parameters are adjustable, or a plurality of filters 631 having different filter parameters.
  • the channel filtering unit 23 is provided with a filter 631 with adjustable filter coefficients, and the filter parameters are adjusted accordingly for different filtering performances. Filtering for different wideband digital signals.
  • the embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium stores computer executable instructions, and the computer executable instructions are implemented to implement an adaptive filtering method.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function.
  • This application is not limited to any specific combination of hardware and software.
  • the above technical solution solves the performance tradeoff of the fixed channel filter in different in-band signals and adjacent-band interference scenarios, and the filtering effect is not good, so that the signal filtering effect is better.

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  • Computer Networks & Wireless Communication (AREA)
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  • Noise Elimination (AREA)

Abstract

L'invention concerne un procédé de filtrage auto-adaptatif, consistant à : acquérir un rapport d'interférence d'un signal numérique à large bande devant être soumis à un traitement de filtrage ; établir une performance de filtrage et un mode de filtrage de canal correspondant au rapport d'interférence selon le rapport d'interférence ; et utiliser le mode de filtrage de canal pour soumettre le signal numérique à large bande au filtrage de canal. La solution technique résout les problèmes posés par un compromis de performance et un mauvais effet de filtrage d'un filtre de canal fixe dans différents scénarios d'interférence de signal dans la bande et de canal adjacent, de sorte à obtenir un meilleur effet de filtrage de signal.
PCT/CN2016/081167 2015-08-28 2016-05-05 Appareil et procédé de filtrage auto-adaptatif WO2017036161A1 (fr)

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CN201510540500.9A CN106487403A (zh) 2015-08-28 2015-08-28 一种自适应滤波方法和装置

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Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0578007A1 (fr) * 1992-07-08 1994-01-12 Blaupunkt-Werke GmbH Circuit pour détecter et supprimer l'interférence des canaux adjacents
US5493717A (en) * 1993-06-11 1996-02-20 Blaupunkt-Werke Gmbh Adjacent channel interference detection & suppression circuit
CN1288609A (zh) * 1998-01-08 2001-03-21 艾利森公司 用多中频滤波器抗邻信道干扰的方法和装置
CN102387097A (zh) * 2010-09-03 2012-03-21 诺基亚公司 无线电链路质量估计的偏差去除

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578007A1 (fr) * 1992-07-08 1994-01-12 Blaupunkt-Werke GmbH Circuit pour détecter et supprimer l'interférence des canaux adjacents
US5493717A (en) * 1993-06-11 1996-02-20 Blaupunkt-Werke Gmbh Adjacent channel interference detection & suppression circuit
CN1288609A (zh) * 1998-01-08 2001-03-21 艾利森公司 用多中频滤波器抗邻信道干扰的方法和装置
CN102387097A (zh) * 2010-09-03 2012-03-21 诺基亚公司 无线电链路质量估计的偏差去除

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