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WO2018018579A1 - Appareil de démodulation basée sur des informations vectorielles, et procédé de démodulation - Google Patents

Appareil de démodulation basée sur des informations vectorielles, et procédé de démodulation Download PDF

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Publication number
WO2018018579A1
WO2018018579A1 PCT/CN2016/092221 CN2016092221W WO2018018579A1 WO 2018018579 A1 WO2018018579 A1 WO 2018018579A1 CN 2016092221 W CN2016092221 W CN 2016092221W WO 2018018579 A1 WO2018018579 A1 WO 2018018579A1
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WO
WIPO (PCT)
Prior art keywords
vector
signal
lookup table
demodulation
vector signal
Prior art date
Application number
PCT/CN2016/092221
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English (en)
Chinese (zh)
Inventor
张科峰
Original Assignee
武汉芯泰科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉芯泰科技有限公司 filed Critical 武汉芯泰科技有限公司
Priority to PCT/CN2016/092221 priority Critical patent/WO2018018579A1/fr
Publication of WO2018018579A1 publication Critical patent/WO2018018579A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits

Definitions

  • the present invention relates to the field of demodulation technologies, and in particular, to a vector-based demodulation device and a demodulation method.
  • Demodulation is the process of recovering a message from a modulated signal carrying a message.
  • the transmitting end modulates the carrier with the message to be transmitted to generate a signal carrying the message, and the receiving end must recover the transmitted message in order to utilize it.
  • Demodulation is the inverse of modulation.
  • the modulation method is different and the demodulation method is different.
  • demodulation can be divided into sine wave demodulation and pulse wave demodulation.
  • Sine wave demodulation can be further divided into amplitude demodulation, frequency demodulation and phase demodulation.
  • there are some variants such as single sideband signal demodulation and vestigial sideband signal demodulation.
  • pulse wave demodulation can be divided into pulse amplitude demodulation, pulse phase demodulation, pulse width demodulation, and pulse code demodulation.
  • Multiple modulation is required for multiple modulation. Since the digital baseband signal can only take discrete finite values, the corresponding carrier parameters can only take discrete finite values.
  • the modulated signal can be regarded as the result of switching the carrier of different parameters by the digital baseband signal.
  • This implementation method is called keying method. Therefore, the above three basic digital modulation methods are generally referred to as ASK (Amplitude Shift Keying), FSK (Frequency Shift Keying), and PSK (Phase Shift Keying).
  • QAM Quadratture Amplitude Modulation
  • the method of mapping from digital signals to modulation symbols is fixed, cannot be programmed, and is incompatible with each other. Accordingly, the demodulation methods corresponding to the modulation method are also not programmable and are not compatible with each other.
  • the relative positions between the constellation points in the constellation diagram are fixed, not programmable, and the constellation points cannot be randomly selected according to actual needs.
  • the demodulation technique the relative positions between constellation points in the constellation diagram are fixed, not programmable, and the constellation points cannot be randomly selected according to actual needs.
  • the method of mapping from digital signals to modulation symbols is fixed, cannot be programmed, and is incompatible with each other.
  • the demodulation corresponding to the modulation mode The way is also not programmable, and it is not compatible with each other.
  • the relative positions between the constellation points in the constellation diagram are fixed, not programmable, and the constellation points cannot be randomly selected according to actual needs.
  • the demodulation technique the relative positions between constellation points in the constellation diagram are fixed, not programmable, and the constellation points cannot be randomly selected according to actual needs.
  • the present invention provides a vector-based demodulation apparatus and a demodulation method.
  • a vector-based demodulation apparatus including:
  • a lookup table unit for storing a vector signal, a digital signal corresponding to the vector signal, and a mapping relationship thereof in the form of a lookup table
  • a comparing unit configured to compare the input vector signal with a vector signal stored in the lookup table unit, and the lookup table unit outputs a corresponding digital signal according to the comparison result of the comparing unit.
  • the vector signal is any vector signal in any quadrant of the constellation diagram, and is different in the constellation diagram.
  • the vector signals are independent of each other.
  • the lookup table unit is a register.
  • a vector-based demodulation method including the following steps:
  • the vector signal is any vector signal in any quadrant of the constellation diagram, and is different in the constellation diagram.
  • the vector signals are independent of each other.
  • the lookup table is stored in a register.
  • the embodiments of the present invention have the following beneficial effects:
  • the present application makes the demodulation mode of the signal compatible with any existing demodulation modes through the comparison unit and the lookup table unit, including rectangular QAM, heart-shaped QAM, PS K, and ASK and so on.
  • the demodulation method of the present application is vector-based, and has the functions of amplitude modulation and phase modulation.
  • FIG. 1 is a block diagram of a typical communication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of the demodulation device shown in FIG. 1;
  • FIG. 3 is a flow chart of a demodulation method provided by the present invention.
  • 4a and 4b are schematic diagrams showing the structure of a constellation diagram provided by an embodiment of the present invention.
  • the communication system 100 includes: a source encoding device 102, a channel encoding device 104, a modulating device 106, a channel 108, a demodulating device 110, a channel decrypting device 112, and a source encoding device 114.
  • the source encoder 102 is configured to receive the source 151 to be transmitted.
  • the source coding apparatus 102 is for encoding the source 151 and generating a source coded signal 152.
  • Channel coding means 104 is operative to channel encode source coded signal 152 and to generate channel coded signal 153.
  • Modulation means 106 is operative to modulate encoded signal 153 into signal 154 to be transmitted.
  • the to-be-transmitted signal 154 provides a receive signal 155 to the receiving end over the channel 108.
  • the channel 108 includes but not Limited to microwave radio links, satellite channels, fiber optic cables, composite fiber optic cable systems, or copper cables.
  • the channel 108 includes a propagation medium that can introduce interference and distortion into the signal 154 to be transmitted such that the received signal 155 is different from the signal 154 to be transmitted. Interference and distortion include, but are not limited to, noise, attenuation, phase shift changes, etc.
  • the demodulation device 110 is configured to demodulate the received signal 155 into a demodulated signal 156.
  • Channel decoding device 112 is operative to decode demodulated signal 156 into channel decoded signal 157.
  • Source decoding device 114 is operative to further decode channel decode signal 157 into target signal 158.
  • the target signal 158 is provided to one or more receiver user devices.
  • the one or more receiver user devices include, but are not limited to, a personal computer, a digital terminal device, a telephone device, a personal digital assistant, a software application, or any other device that can transmit or receive data.
  • FIG. 2 is a schematic structural diagram of a demodulation apparatus according to an embodiment of the present invention.
  • the demodulation device 110 includes: a comparison unit 202 and a lookup table unit 204.
  • the lookup table unit 204 is for storing a vector signal, a digital signal corresponding to the vector signal, and a mapping relationship thereof in the form of a lookup table.
  • the vector signal and the mapping relationship are stored in the form of a lookup table, so that the vector signal and the mapping relationship can be freely changed. Because the mapping relationships are stored in a table rather than being solidified, they can be updated later.
  • the digital signal, the vector signal and the mapping relationship stored in the modulation device 106 are transmitted to the modulation device 110, thereby modulating the device 110.
  • the contents of its lookup table can be automatically updated accordingly.
  • the mapping between the digital signal and the vector signal is a one-to-one mapping.
  • the comparison unit 202 is for comparing the input vector signal 155 with the vector signal 2 51 stored in the lookup table unit 204, and the lookup table unit 204 outputs the corresponding digital signal 156 according to the comparison result 252 of the comparison unit 202.
  • lookup table unit 204 may employ a variety of data lookup methods to quickly find vector signal 251 that matches input vector signal 155 for input into comparison unit 202.
  • the data search method adopted by the lookup table unit 202 includes: a sequential search method, a binary search method, a binary tree, and the like.
  • the vector signal closest to the input quantity signal 155 is selected as the input vector.
  • the signal, and the digital signal 156 corresponding to the closest vector signal is used as the output of the lookup table unit 204.
  • the vector signals A1 ⁇ A8 may be any vector signals in any quadrant of the constellation and are different in the constellation.
  • the vector signals Al ⁇ A8 can be selected from the same quadrant of the constellation.
  • the vector signals A1 ⁇ A8 can also be selected from different quadrants of the constellation. However, whether it is from the same quadrant or from different quadrants, the vector signals A1 ⁇ A8 are different in the constellation, so that the mapping between the digital signal and the vector signal is guaranteed to be one-to-one mapping.
  • the vector signals A1 to A8 are independent of each other, and there is no dependency between the vector signals.
  • the user can select each vector signal in a targeted manner. It should be understood that the user can individually configure each vector signal according to actual needs so that there is a certain relationship between them. Thus, when it is necessary to be compatible with existing modulation schemes, vector signals can be configured to meet existing modulation schemes.
  • lookup table unit 204 is a register.
  • the input digital signal 153 can be the address signal of the register, and the vector signal 154 corresponding to the digital signal 154 can be stored in the register.
  • the register 204 automatically outputs the vector signal 154 stored in the address.
  • the correspondence between the address signal and the vector signal can be configured by the configuration unit 202.
  • the present application enables the demodulation of signals by the comparison unit and the lookup table unit to be compatible with any existing demodulation modes, including rectangular QAM, heart-shaped QAM, PSK, and ASK.
  • the demodulation method of the present application is vector-based, and has the functions of amplitude modulation and phase modulation.
  • This embodiment provides a vector-based demodulation method. As shown in FIG. 3, the vector-based demodulation method can be applied to a demodulation device as described above, and the method can include the following steps:
  • Sl storing a vector signal, a corresponding digital signal, and a mapping relationship thereof in the form of a lookup table
  • the vector signals A1 ⁇ A8 may be in the constellation diagram. Any vector signal in the image limit, and is different in the constellation. As shown in Figure 4a, the vector signals Al ⁇ A8 may be selected from the same quadrant of the constellation. As shown in Figure 4b, the vector signals A1 ⁇ A8 can also be selected from different quadrants of the constellation. However, whether it is from the same quadrant or from different quadrants, the vector signals A1 ⁇ A8 are different in the constellation, so that the mapping between the digital signal and the vector signal is guaranteed to be a one-to-one mapping.
  • the vector signals A1 to A8 are independent of each other, and there is no dependency between the vector signals.
  • the user can select each vector signal in a targeted manner. It should be understood that the user can individually configure each vector signal according to actual needs so that there is a certain relationship between them. Thus, when it is necessary to be compatible with existing modulation schemes, vector signals can be configured to meet existing modulation schemes.
  • the lookup table is stored in a register.
  • the lookup table 1 includes the input vector signals A1 to A8, and the digital signals 000 to 111 (assuming the address signals are 3 bits) corresponding to the vector signals one by one.
  • the number of bits of the address signal is only an example in this embodiment, and is not intended to limit the number of bits of the address signal.
  • the number of bits of the address signal can be designed to satisfy any modulation method as needed.
  • the lookup table unit 204 will one or more of the vector signals A1 to A8 in the lookup table according to a certain search method.
  • the input to comparator 202 compares with vector signal 155 and then outputs a corresponding digital signal 156 based on the comparison. For example, when the input vector signal 155 is the same as the vector signal A2 in the lookup table, the comparison unit 202 feeds back the comparison result 252 to the lookup table unit 204, and the lookup table unit 204 outputs the digital signal 000 corresponding to the vector signal A2. For another example, when the input vector signal 155 is different from the vector signals A1 ⁇ A8 in the lookup table, but the distance from A5 is closest, the comparison unit 252 feeds back the comparison result to the lookup table unit 204, and then looks up the table unit 204 output. A digital signal 110 corresponding to vector signal A5.
  • the present application enables the demodulation of signals by the comparison unit and the lookup table unit to be compatible with any existing demodulation modes, including rectangular QAM, heart-shaped QAM, PSK, and ASK.
  • the demodulation method of the present application is vector-based, and has the functions of amplitude modulation and phase modulation.
  • the digital signal is a Gray code to reduce the bit error rate.
  • Other binary codes may also be employed in other embodiments of the invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

L'invention concerne un appareil de démodulation basée sur des informations vectorielles, et un procédé de démodulation. L'appareil de démodulation basée sur des informations vectorielles comprend une unité de configuration pour recevoir des informations de configuration d'utilisateur qui sont utilisées pour mapper un signal numérique sur un signal vectoriel correspondant ; et une unité de consultation de table pour stocker le signal numérique, le signal vectoriel correspondant et la relation de correspondance entre ceux-ci sous la forme d'une table à consulter, et pour interroger en outre la table à consulter d'après le signal numérique d'entrée et produire le signal vectoriel correspondant. Dans la présente invention, un procédé de modulation de signal peut être configuré au moyen d'une unité de configuration et d'une unité de consultation de table. En outre, un signal numérique est mappé sur un signal vectoriel, de sorte qu'une modulation de phase et une modulation d'amplitude peuvent être implémentées simultanément. Le procédé de modulation selon la présente invention est donc compatible avec l'un quelconque des procédés de modulation existants : QAM de constellation rectangulaire, QAM en forme de cœur, PSK, ASK, etc.
PCT/CN2016/092221 2016-07-29 2016-07-29 Appareil de démodulation basée sur des informations vectorielles, et procédé de démodulation WO2018018579A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030156659A1 (en) * 2002-02-21 2003-08-21 Seishi Hanaoka Mapping method of code word with QAM modulation
CN1913416A (zh) * 2005-08-12 2007-02-14 华为技术有限公司 一种多用户映射信号的解调方法
CN101515919A (zh) * 2008-02-22 2009-08-26 北京大学 一种数字通信方法
CN103378921A (zh) * 2012-04-17 2013-10-30 华为技术有限公司 信号解调方法和装置
CN106059985A (zh) * 2016-07-29 2016-10-26 武汉芯泰科技有限公司 一种基于矢量的解调装置及解调方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030156659A1 (en) * 2002-02-21 2003-08-21 Seishi Hanaoka Mapping method of code word with QAM modulation
CN1913416A (zh) * 2005-08-12 2007-02-14 华为技术有限公司 一种多用户映射信号的解调方法
CN101515919A (zh) * 2008-02-22 2009-08-26 北京大学 一种数字通信方法
CN103378921A (zh) * 2012-04-17 2013-10-30 华为技术有限公司 信号解调方法和装置
CN106059985A (zh) * 2016-07-29 2016-10-26 武汉芯泰科技有限公司 一种基于矢量的解调装置及解调方法

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