Method and device of iterative demodulation and decode for BPSK modulating system by Turbo encoding

A modulation system and decoding device technology, applied in the field of communication

Inactive Publication Date: 2005-07-06
COMM ENG COLLEGE SCI & ENGINEEIRNG UNIV PLA
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Problems solved by technology

[0075] The purpose of this invention is to provide a method that can solve how to calculate A 2 P 2 Method and device for iterative demodulation and decoding of Turbo codes for the measurement problem of the second subcode system information symbol sequence of the module

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  • Method and device of iterative demodulation and decode for BPSK modulating system by Turbo encoding
  • Method and device of iterative demodulation and decode for BPSK modulating system by Turbo encoding
  • Method and device of iterative demodulation and decode for BPSK modulating system by Turbo encoding

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Embodiment Construction

[0144] For the overall scheme of the iterative demodulation and decoding method of the present invention, see Figure 6 .

[0145] This implementation plan is based on the CPLD chip EP20K400EBC652-2X of Alter Company, and provides the development of the demodulation and decoding algorithm of the Turbo code suggested in the high-speed service of the third-generation mobile communication system IMT-2000 under a typical channel with unknown frequency offset and phase instance. For the FPGA implementation structure of this example, see Figure 7 , to achieve a master clock of 32MHz, allowing a decoding rate of 115.2kbps. The system also has 5 external RAMs and a DSP chip (TMSC5402), and the initial frequency deviation and phase estimation are completed in DSP. The division operation in the CPE module is realized by using a look-up table. in the right Figure 7 Before making further explanations, we first give the specific encoding parameters of the Turbo code selected in the ...

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Abstract

The present invention relates to an iterative demodulation and decoding method and device of a Turbo coded BPSK modulation system, which splits the channel received signal and transmits it to two corresponding sub-decoders. After sub-decoder 1 receives the channel received signal, it passes the The soft-in and soft-out module calculates the output external information and the equivalent system information bit metric; the sub-decoder 2 receives the external information output by the sub-decoder 1 and the interleaved equivalent system information bit metric, calculates the output external information, and Transmit it to sub-decoder 1 to complete an iteration; after the number of iterations reaches the preset value, perform hard judgment on the output external information of sub-decoder 2 to obtain the estimation of each information bit, and complete decoding. It can be used to effectively solve the measurement calculation problem of the system information bits of the second subcode brought by the turbo code interleaver; it is simple and practical, and easy to realize digitally; it can be widely used in wireless and satellite communication fields.

Description

Technical field: [0001] The invention relates to the communication field, in particular to a method and device for iterative demodulation and decoding of Turbo codes modulated by BPSK in wireless and satellite communication systems. Background technique: [0002] In wireless and satellite communication systems, transmitted bits are affected by random noise in the channel and generate random errors. It has been proved by theory and practice that the error-correcting coding method, which provides transmission reliability by introducing redundancy, is a kind of effective means. The Turbo code introduced in recent years is one of the coding schemes with the strongest error correction ability found so far. [0003] Turbo codes were proposed by C.Berrou et al. in 1993 [C.Berrou, A.Glavieux, and P.Thitimajshima, "Near Shannon limit error-correcting coding and decoding: Turbo-codes," in ICC'93, Geneva, Switcherland, May , 1993, pp.1064-1070], which is considered to be one of the g...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/00H03M13/29H04B7/15H04L27/22
Inventor 吴晓富崔龙项海格
Owner COMM ENG COLLEGE SCI & ENGINEEIRNG UNIV PLA
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