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Code modulation method based on complete response CPM (continuous phase modulation) and Turbo product code

A coding modulation and product code technology, applied in the field of modulation and error control coding, can solve the problems of high complexity of iterative decoding algorithm, large delay of iterative decoding and decoding, difficulty in finding LDPC codes, etc., and achieve simplified outer code design , Reduce the decoding delay and improve the efficiency of system design

Inactive Publication Date: 2011-10-19
XIDIAN UNIV
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Problems solved by technology

The shortcomings of this method are: at the receiving end, iterative decoding is required between the inner and outer codes, the delay is large, and the complexity of the iterative decoding algorithm is high, which makes it difficult to program and implement the decoding algorithm on programmable devices
The shortcomings of this method are: in order to avoid "four rings" when designing

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  • Code modulation method based on complete response CPM (continuous phase modulation) and Turbo product code
  • Code modulation method based on complete response CPM (continuous phase modulation) and Turbo product code
  • Code modulation method based on complete response CPM (continuous phase modulation) and Turbo product code

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[0030] The present invention will be further described below in conjunction with the drawings.

[0031] Reference attached figure 1 The detailed steps of the present invention are as follows:

[0032] Step 1. The Turbo product code row-column subcode in the Turbo product code encoder is initialized by the coding method of the extended Hamming code. Initialization means that the Turbo product code encoder sets n as the code word length of the Turbo product code subcode, sets k as the length of the Turbo product code subcode information bit, and initializes the encoding buffer of n rows and n columns to all 0s.

[0033] In the embodiment of the present invention, an extended Hamming code with code word length n=32 and information bit length k=26 is used as the sub-code of the Turbo product code. Therefore, the Turbo product code encoder sets 32 as the code word length of the Turbo product code subcode, 26 as the length of the Turbo product code subcode information bit, and initializes...

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Abstract

The invention discloses a code modulation method based on complete response CPM (continuous phase modulation) and a Turbo product code, and the method can be used for solving the problems of the requirement of iterative decoding of inner-outer codes, difficulty in seeking for the optimum outer code and the fixing of modulation parameters in the prior art. The the method provided by the invention is implemented through the following specific steps: (1) initializing a Turbo product code encoder; (2) reading in signal sequence; (3) decoding the Turbo product code; (4) interweaving randomly; (5) carrying out symbol mapping; (6) carrying out non-recursion continuous phase decoding; (7) carrying out memoryless modulation. According to the invention, the error bit ratio can be achieved well without iterative decoding between the inner-outer codes, the code delay is reduced, the complexity of programming for a decoding algorithm on a programmable device is reduced, and the outer code design is simplified; and the non-recursion continuous phase modulation parameters provided by the invention are flexible and variable, and different requirements on power efficiency, frequency spectrum efficiency and reliability of different communication systems can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a modulation and error control coding method in digital communication. The method is based on a non-recursive full-response continuous phase modulation (Continuous Phase Modulation, CPM) and Turbo product code combined serial concatenated coding modulation method, can be used in telemetry, satellite communication, deep space communication technology field, can improve the system spectral efficiency, power efficiency and reliability. Background technique [0002] At present, in domestic and foreign communication systems, CPM (Continuous Phase Modulation) is generally used as the cascading method of the inner code and the error control code with excellent performance to improve the spectral efficiency, power efficiency and reliability of the system. The cascading methods of CPM as inner code and error control coding with excellent performance mainly include: convolutio...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 孙锦华李梦良吴小钧
Owner XIDIAN UNIV
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