A single-layer iterative joint demodulation and decoding structure and its algorithm

Abstract

The invention discloses a single-layer iteration combination demodulation decoding structure and an algorithm thereof. The structure comprises a MAP demodulator, a first de-interleaver, an inner decoder, a second de-interleaver, an outer decoder, a first interleaver and second interleaver, wherein the MAP demodulator, the first de-interleaver, the inner decoder, the second de-interleaver and the outer decoder are successively connected. An input terminal of the first interleaver is connected to an output terminal of the inner decoder, and an output terminal is connected to an input terminal of the MAP demodulator. An input terminal of the second interleaver is connected to an output terminal of the outer decoder, and an output terminal is connected to an input terminal of the inner decoder. A SCCC type Turbo code sequence Y to be decoded is input into the MAP demodulator and is demodulated. The MAP demodulator and an internal code decoder use code word symbol soft information output by the internal code decoder and an external code decoder as prior information respectively so as to carry out decoding. The structure and the algorithm have advantages that compared to a double layer iteration structure, complexity is reduced through using a single-layer iteration structure; and compared to traditional difference demodulation, by using the structure and the algorithm, a certain performance gain can be acquired under a condition that a signal to noise ratio is high.

Description

technical field [0001] The invention belongs to the field of channel demodulation and decoding, and in particular relates to a single-layer iterative joint demodulation and decoding structure and an algorithm thereof, which are suitable for differential serial concatenation (SCCC) turbo codes. Background technique [0002] In a wireless channel, it is difficult to accurately obtain carrier information. Compared with PSK modulation, DPSK based on non-coherent demodulation solves the carrier phase ambiguity, but compared with PSK coherent demodulation, there is a greater performance loss. M.Peleg, SShamai.Iterative decoding of coded and interleaved non-coherent multiplesymbols detected DPSK([J].Electron Lett,1997,33:1018-1020), proposed a method of iterative demodulation and decoding, and Turbo code The idea of ​​soft information iteration is applied to the joint demodulation and decoding of DPSK modulated convolutional codes, which greatly improves the decoding performance of...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a single-layer iterative joint demodulation and decoding structure and its algorithm to solve the problems of high computational complexity of the double-layer iterative demodulation and decoding structure and the low performance of traditional differential demodulation

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