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Iterative demodulating-decoding method and apparatus for code modulation system having output external information

A technology of coding modulation and decoding method, which is applied in the direction of active electrical relay system, coding, coding components, etc., and can solve problems that do not involve amplitude and noise variance

Inactive Publication Date: 2004-11-03
COMM ENG COLLEGE SCI & ENGINEEIRNG UNIV PLA
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Problems solved by technology

[0012] In addition, in this patent application, the estimation of amplitude and noise variance is not involved, and accurate estimation of amplitude and noise variance is also very important for Turbo / LDPC decoding

Method used

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  • Iterative demodulating-decoding method and apparatus for code modulation system having output external information
  • Iterative demodulating-decoding method and apparatus for code modulation system having output external information
  • Iterative demodulating-decoding method and apparatus for code modulation system having output external information

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Embodiment Construction

[0161] Here, based on Alter's CPLD chip EP20K400EBC652-2X, an example of 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 is given in a typical channel with unknown frequency offset and phase. For the FPGA+DSP implementation structure of this example, see Figure 4 , to achieve a master clock of 32MHz, allowing a decoding rate of 115.2kbps. The system also has 2 external RAMs and a DSP chip (TMSC5402), and the Turbo decoding module is implemented in hardware in the CPLD chip, while image 3 The other modules of the shown receiver are implemented in software in DSP. in the right Figure 4 Before making further explanations, we first give the specific encoding parameters of the Turbo code selected in the example.

[0162] This example selects the channel coding of the third-generation mobile communication system IMT-2000 high-speed business. The Turbo ...

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Abstract

This invention relates to an iterative demodulation method and the device for the coding modulation system with output foreign information. An initial phase estimation module estimates an initial value of the phase and M2M4 evaluator gets the rough estimation of the amplitude and noise variance, the two values of which start a phase / offset tracing module outputting a tracing phase to a channel signal rectifier to be output to the amplitude / noise variance estimation module which starts its work to get a more accurate variance estimation sent to the iterative decoder to finish a process of iterative demodulation and decode to start the two modules for the next time iterative demodulation and decode to its foreign information.

Description

[0001] Technical Field: The present invention relates to the technical field of wireless and satellite communication, in particular to an iterative demodulation and decoding method and device for a coded modulation system with output external information. 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 codes and LDPC codes introduced in recent years are 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], w...

Claims

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Application Information

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