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

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

Inactive Publication Date: 2003-12-24
COMM ENG COLLEGE SCI & ENGINEEIRNG UNIV PLA
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Problems solved by technology

[0057] 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 approach

[0124] For the overall scheme of the iterative demodulation and decoding method of the present invention, see Figure 6 .

[0125] 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 split signal received in the channel is transferred to two sub decoders. With the channel receiving signal being received, the subdecoder 1 calculates out the external information and the information bits size of the equivalent system by using the module in soft-in and sort-out. The sub decoder 2 receives the said information from the output of the decoder 1. Then, the sub decoder 2 calculates and outputs the external information, transferring the information to the decoder 1. Thus, one time of iteration is completed. When the number of iteration reaches a preset value, with the interlacement of the external information output from the decoder 2 being removed, the hard decision is carried out to obtain a estimate value for each information bit, and the decoding procedure is completed.The invention features simple, practical and easy to implement in digital format, suitable to wireless and satellite communications area.

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 Applications(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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