Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Information Theory

Design and Implemetation of Concatenated System Based on CPM and LDPC

Author ShiKeXian
Tutor XuYouYun;HuYaoMing
School Shanghai Jiaotong University
Course Electronics and Communication Engineering
Keywords Low Density Parity Check Continuous Phase Modulation Serially concatenated BCJR SISO Iterative Decoding FPGA
CLC TN911.2
Type Master's thesis
Year 2011
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Continuous phase modulation (CPM) can be decomposed into a continuous phase encoder (CPE) and a memoryless modulator (MM). The continuous phase encoder which is essentially a CPE convolutional encoder with a coding gain . Therefore, the phase modulation as the inner code , and a low density parity check LDPC code as an outer code , can form a concatenated code in the traditional sense system . Such a system to improve the effectiveness of the power is self-evident , the key is to control the complexity of the range that can be achieved . LDPC codes are very popular in recent years, an error correction coding. The use of information in the check node and variable node for transfer between the iterative decoding , has excellent performance and relatively low implementation complexity . This article describes the LDPC code encoding and decoding algorithms , H array design methods. Describes the CPM signal decomposition methods, the most commonly used Viterbi algorithm . Introduced CPM soft input soft output BCJR algorithm and proposed MSK cascade system with LDPC . Analysis of the cascade system performance, as well as interleaver impact on system performance , and proposed interleaver general design methods. Finally, a kind of LDPC codes codec FPGA implementation.

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