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Constellation mapping and demapping method, and coding, modulating, decoding and demodulating system

A technology of constellation mapping and demodulation system, applied in the field of digital information transmission, can solve the problems of inconvenient coding and modulation scheme design and implementation, high decoding complexity, and achieve the effect of easy design and implementation and low decoding complexity

Active Publication Date: 2013-08-07
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the constellation mapping, demapping method, coding modulation and decoding demodulation system in the prior art still have problems such as high decoding complexity and inconvenient design and implementation of coding and modulation schemes.

Method used

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  • Constellation mapping and demapping method, and coding, modulating, decoding and demodulating system
  • Constellation mapping and demapping method, and coding, modulating, decoding and demodulating system
  • Constellation mapping and demapping method, and coding, modulating, decoding and demodulating system

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Embodiment 1

[0041] In this embodiment, an example is given to illustrate the symbol-amplitude independent modulation constellation mapping method provided by the present invention.

[0042] Flowchart such as figure 1 A symbol-amplitude independent modulation constellation mapping method shown in , where the constellation mapping order M=2 m , the constellation mapping dimension is D, where m, D are positive integers, including steps:

[0043] S11. According to the constellation mapping order M, divide every m input bits into a group;

[0044] S12. Let the constellation mapping result, that is, the signal S to be transmitted, be a D-dimensional real number vector, S=[s 1 ,s 2 ,...,s D], where the sign of each dimension is determined by D input bits in each group of input bits, which is equivalent to a D-dimensional BPSK (Binary Phase Shift Keying, binary phase shift keying); the rest of each group of input bits The m-D input bits determine the absolute value of the amplitude of each d...

Embodiment 2

[0058] In this embodiment, an example is given to illustrate the demapping method corresponding to the symbol-amplitude independent modulation constellation mapping method described in Embodiment 1 of the present invention.

[0059] S21. Demapping the received signal as a D-dimensional binary phase-shift keying signal in combination with the channel state information to obtain D bits of demapping soft information;

[0060] S22. Take the absolute value of each dimension of the received signal, combined with the channel state information, demap the received signal after taking the absolute value in the first quadrant of the D-dimensional space, and obtain the demapped soft information of the remaining m-D bits.

[0061] Compared with the demapping method in the prior art that regards the constellation mapping as a whole, the method provided by the present invention is used for demapping, and the order of the constellation points required to be calculated is reduced to 1 / 2 of the ...

Embodiment 3

[0063] In this embodiment, the coding and modulation system and the decoding and demodulation system provided by the present invention are illustrated by using the coding and modulation system and the decoding and demodulation system based on Gray-APSK constellation mapping of symbol-amplitude independent modulation.

[0064] A coding and modulation system, which is located at the transmitting end, includes an encoder module, a bit interleaving module and a symbol-amplitude independent modulation constellation mapping module arranged in sequence;

[0065] An encoder module, configured to perform channel encoding on information bits to be transmitted to obtain encoded bits;

[0066] A bit interleaving module, configured to perform bit interleaving on coded bits to obtain interleaved bits;

[0067] The symbol-amplitude independent modulation constellation mapping module uses interleaving bits as input bits, and according to the constellation mapping method described in Embodimen...

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Abstract

The invention relates to the technical field of digital information transmission, in particular to a constellation mapping and demapping method, and a coding, modulating, decoding and demodulating system. In a sign-amplitude independent modulation constellation mapping method, constellation mapping order M equals to 2m, and the constellation mapping dimension is D. The constellation mapping method includes that S11, each m input bits are divided into a group according to the constellation mapping order M; S12, when a transmission signal S equaling to [s1,s2,...,sD] is a D-dimensional real-number vector, plus-minus of each dimension is determined by D input bits in each group of input bits, and rest input bits with number of subtracting D from m determine absolute values of each-dimensional range of to-be-transmitted signals. The absolute values refer to Iota s1 Iota, Iota s2 Iota,..., Iota sD Iota . The method and the system with the method have low decoding complexity, and design and implementation of coding and modulating schemes are facilitated.

Description

technical field [0001] The present invention relates to the technical field of digital information transmission, in particular to a constellation mapping, demapping method, coding modulation and decoding demodulation system. Background technique [0002] One of the fundamental tasks of digital communication systems, including typical wireless mobile communication systems and terrestrial digital broadcasting systems, is to realize the error-free transmission of digital information. Using channel coding for error control is the most effective method and means to realize this fundamental task. In order to meet the transmission requirements of digital information on common analog channels, channel coding technology usually needs to be combined with digital modulation technology. The combination of channel coding and modulation constitutes a coded modulation system. The coded modulation system is a subsystem of the digital communication system transmitter and one of its core mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/04H04L27/06
Inventor 潘长勇黄嘉晨彭克武阳辉
Owner TSINGHUA UNIV
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