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LTE in error correction coding and its DSP implementation

Author: ChenBin
Tutor: YanBo
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: LTE Channel codec Tail biting convolutional code Turbo codes DSP
CLC: TN911.22
Type: Master's thesis
Year: 2011
Downloads: 76
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Abstract


LTE (Long Term Evolution) is the evolution of the third generation mobile communication technology projects the 3GPP standardization organizations to start at the end of 2004 . Lower system latency, higher user data rate , greater system capacity , the greater the coverage and lower cost requirements in order to meet the LTE system , in the LTE system using OFDM ( Orthogonal Frequency Division Multiplexing used) and MIMO (Multiple input Multiple Output ) as the key technique and the use of flattened network structure ; LTE system supports a maximum of 20MHz bandwidth of the system can be expanded to achieve a peak transfer rate of 50Mbps 100Mbps and uplink direction in the downstream direction . Error correction codec technology is a vital part of the LTE mobile communication system , error correction encoding and decoding technology will directly affect the system capacity and system performance . Error correction codec technology for the LTE system , this paper carried out in-depth , theoretical analysis and study of the system , and complete the relevant codec algorithm DSP implementation . First , this paper reviews the principle of error correction encoding and decoding , including maximum likelihood decoding convolutional codes and Viterbi decoding . Secondly, tail biting convolutional codes and Turbo Code Decoding Principle depth analysis . For tail biting convolutional codes , the article focuses on maximum likelihood decoding algorithm and surround the Viterbi algorithm , and its performance the MATLAB simulation ; This article discusses the maximum a posteriori decoding MAP algorithm for Turbo codes , Log-MAP algorithm and Max-Log-MAP algorithm , and its decoding performance in LTE channel environment simulation . Finally, on the basis of the MATLAB simulation link , this article is based on Freescale's MSC8156 DSP tail biting convolutional coding and surround the Viterbi algorithm , Turbo codes encoding and decoding algorithm for Max-Log-MAP , and DSP implementation testing and analysis of test results prove that the algorithm works can be realized .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Information Theory > Channel coding theory
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