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Iterative decoding method based on extended Turbo code and continuous phase modulation

A phase modulation and iterative technology, applied in the field of iterative decoding, can solve the problem of increasing the complexity of the receiver, and achieve the effects of effective and reliable transmission, reduced complexity, and good bit error effect.

Pending Publication Date: 2022-07-29
XIDIAN UNIV +1
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Problems solved by technology

Although this method can achieve a lower bit error rate under the condition of low signal-to-noise ratio, it increases the complexity of the receiver because it needs to iterate 8 times to improve the convergence of the system.

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  • Iterative decoding method based on extended Turbo code and continuous phase modulation
  • Iterative decoding method based on extended Turbo code and continuous phase modulation
  • Iterative decoding method based on extended Turbo code and continuous phase modulation

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Embodiment Construction

[0025] The specific embodiments and effects of the present invention will be described in further detail below with reference to the accompanying drawings.

[0026] refer to figure 1 , the implementation steps of this example are as follows:

[0027] Step 1, use the Turbo encoder to Turbo encode the source sequence d to generate Bit to be modulated sequence α.

[0028] refer to figure 2 , the turbo encoder consists of an interleaver, two component code encoders with the same structure, and a puncturing matrix.

[0029] The specific implementation of this step is as follows:

[0030] (1.1) Add m bits of tail bits to the randomly generated l-bit source sequence d to generate N l bit to be encoded sequence T s , and the to-be-encoded sequence T s Interleave through the interleaver in the turbo encoder to obtain the interleaved sequence T 0 s , where l≥1, N l =m+l, m represents the number of registers in the turbo encoder plus 1, this embodiment takes l=253, m=3, N l ...

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Abstract

The invention discloses an iterative decoding method for extended Turbo codes and continuous phase modulation, and mainly solves the problems of too many iterations and high bit error rate in the prior art. According to the implementation scheme, CPM code word priori information is obtained from a CPM signal through a continuous phase modulation detector, CPM information symbol extrinsic information is obtained from the priori information and initial CPM information symbol priori information through a CPM decoder, the extrinsic information is subjected to de-interleaving to obtain Turbo code priori information, then Turbo code extrinsic information is obtained from the priori information through an extended Turbo decoder, and the Turbo code extrinsic information is obtained through a Turbo decoder. And carrying out interleaving by using the extrinsic information to obtain CPM information symbol priori information, and inputting the priori information into a CPM decoder to carry out second cascade decoding to obtain a final decoding output sequence. Compared with the prior art, the decoding iteration frequency is reduced, the bit error rate performance is improved, the complexity of the system is reduced, and the method can be used for receiver detection.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an iterative decoding method, which can be applied to receiver detection of Turbo codes and concatenated signals of continuous phase modulation under low signal-to-noise ratio. Background technique [0002] Turbo code was proposed by C.Berrou et al at the ICC'93 academic exchange conference. The turbo code encoder is formed by two feedback convolutional code encoders connected in parallel through a random interleaver, and then through the deletion matrix, It can generate codewords with different code rates and realize random coding; the turbo code decoder is composed of two component code decoders and a deinterleaver. The decoding process is to use the soft output information of one of the component code decoders as the other. The input information of a component code decoder is decoded iteratively for several times, which can achieve the effect close t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/29H03M13/37
CPCH03M13/2957H03M13/3746H03M13/6502
Inventor 王英孙锦华王方孙铭
Owner XIDIAN UNIV