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Information transmission method based on PSK signal and LDPC joint iterative demodulation decoding

An LDPC code and joint iterative technology is applied in the field of transmission based on the joint iterative demodulation and decoding of PSK signals and LDPC codes. Effect

Active Publication Date: 2014-06-25
PLA UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a transmission method based on the joint iterative demodulation and decoding of PSK signal and LDPC code, so as to solve the problem that the phase synchronization of communication systems such as slow frequency hopping communication is difficult or the cost is too high

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  • Information transmission method based on PSK signal and LDPC joint iterative demodulation decoding
  • Information transmission method based on PSK signal and LDPC joint iterative demodulation decoding
  • Information transmission method based on PSK signal and LDPC joint iterative demodulation decoding

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] Step 1. At the sending end, perform encoding and modulation. The specific steps are as follows:

[0040] The basic composition of the communication system aimed at by the present invention is as follows: figure 1 As shown, the transmitted information is divided into several packets of length K, which are respectively subjected to LDPC encoding to obtain encoded data of length S. In this example, a regular quasi-cyclic LDPC code with a code length of S=4032 and a code rate of 1 / 2 is used. The block size is 168, and its mother matrix is ​​as follows

[0041][-1,-1,91,-1,-1,46,145,-1,-1,-1,98,-1,-1,-1,-1,41,-1,-1;-1 ,-1,-1,-1,-1,145,-1,45,-1,98,45,-1,-1,-1,-1,108,-1,-1;-1,-1,- 1,-1,-1,116,45,-1,-1,-1,-1,16,-1,-1,-1,-1,-1,-1;-1,157,-1,-1,116 ,-1,166,-1,-1,-1,-1,-1,-1,-1,132,-1,-1,-1;157,-1,-1,116,-1,-1,-1 ,45,-1,-1,-1,41,-1,-1,-1,-1,-1,-1;-1,-1,116,-1...

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Abstract

The invention discloses an information transmission method based on PSK signal and LDPC joint iterative demodulation decoding. The method includes the first step of conducting LDPC coding on an information sequence to be sent at the sending end, interweaving the coded information, adding auxiliary data and then conducting PSK modulation, the second step of sending a PSK signal to a receiving end through a segmentation non-coherent white gaussian noise channel, and the third step of combining PSK signal demodulation with LDPC decoding at the receiving end to conduct iteration demodulation decoding, and conducting recovery to obtain the sent information sequence. According to the method, demodulation decoding can be conducted without phase retrieval, the performance of the method is close to the performance of a method with coherent demodulation decoding, and the hardware implementation complexity is quite low. The method can be used for a communication system where phase synchronization such as slow frequency hopping is difficult to achieve or excessively high in cost.

Description

technical field [0001] The invention belongs to wireless communication technology, in particular to a transmission method based on joint iterative demodulation and decoding of PSK signal and LDPC code. Background technique [0002] LDPC (Low Density Check Code) codes have been proposed as early as the 1970s, but they have not been taken seriously for a long time. With the emergence and development of iterative decoding methods in the early 1990s, LDPC codes have a very good decoding method, and the performance is very close to the theoretical limit, thus full of vitality and rapid development, especially in this field It has been widely used in various new communication standards since the century. [0003] PSK (Phase Shift Keying) modulation method is a very traditional and mature modulation technology, which is widely used. Currently, this modulation method is used in many communication systems. There are also many communication systems that combine LDPC codes and PSK m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/36
Inventor 刘爱军张邦宁龚超潘小飞郭道省叶展潘克刚王恒方华晋军续欣王杭先童新海梁小虎
Owner PLA UNIV OF SCI & TECH