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Research and Design of PN Code and Error-Correcting Code in the Spread Spectrum Communication System

Author: TianWenZuo
Tutor: ZhengLinHua
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Spreading code M-sequence Chaotic sequence Error correction coding RS code Volume-level code Related characteristics
CLC: TN914.42
Type: Master's thesis
Year: 2008
Downloads: 188
Quote: 2
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Abstract


In spread spectrum communication , anti-jamming , anti- multipath anti intercepted multiple access communication , synchronization and so closely related to the spreading sequence used . Therefore , the spreading sequence design is one of the core issues of the spread spectrum communication system . This paper focuses on the theory of spreading sequence , spreading sequence family theorists sequence of Hamming features in-depth research . Discuss several common pseudo-random sequence , graduate into a balanced Gold sequence , given a fast algorithm ; study M sequence generation method , the the classic generation M-sequence method based on proposed improved generation of M-sequence method faster , and can be specified series specified number of M sequence ; the chaos sequence of study precision effects related chaotic model , the effect of the different models on the accuracy is not the same . In addition, the comparison of their balance , self , cross correlation the sidelobe peak characteristics to look for a variety of communication systems transmit sequence ; discuss the impact of various factors on the nature of the sequence , and simulation . With the rapid development of communication technology , the increasingly high demand for data transmission reliability . Error correction coding can improve the reliability of digital transmission , more and more attention . This article discusses the error correction coding RS code and convolutional code . Very commonly used in the two codes , we introduce them to the basic principles on the basis of a common codec software implementation . RS code using frequency domain decoding algorithm is much simpler than the time-domain decoding algorithm , and domain elements make computing more convenient tabulation , in addition to discussion of the error correction performance comparison of the frequency domain decoding algorithm for the time domain decoding algorithm . The convolutional code focuses on the Viterbi algorithm in the butterfly diagram based on analysis of the the branch word calculation and the branch metric calculation simplified method , in order to optimize the entire process of \

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Spread spectrum communication
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