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Joint Source and Channel Coding/Decoding Techniques for Wireless Communications

Author: SongDan
Tutor: PengHua
School: PLA Information Engineering University
Course: Signal and Information Processing
Keywords: Source channel codec Wireless Communications Rate allocation Embedded coding Rate compatible channel codeword Turbo Coded Modulation Variable-length code
CLC: TN911.2
Type: Master's thesis
Year: 2009
Downloads: 33
Quote: 0
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Abstract


Limited by the bandwidth of the radio channel, in order to improve the effectiveness of the transmission, it is necessary for efficient data compression, the stream compression but also increases the sensitivity to noise. Accordingly, in the error rate. Time-varying radio channel transmission, requires the use of strong error protection, which reduces the effectiveness. Traditional communication system using the method of separation of source coding and channel coding design can not be a reasonable solution to this contradiction. To this end, the letter joint source and channel coding and decoding (JSCC / JSCD, Joint Source and Channel Coding / Decoding) technology came into being, the source codec and channel codec optimized according to the characteristics of the source and channel conditions can be effectively use of bandwidth. Power and other resources and access to excellent. The stability of the end-to-end transmission performance. In this paper, the letter joint source and channel coding and decoding technology and its applications in wireless image transmission and low signal-to-noise ratio signal reception. The main work of the paper is divided into the following two aspects: 1. Joint coding rate allocation. Compatible embedded source coding and bit rate in the case of limited bandwidth the channel codeword bit allocation is given a unified description of the problem. The same time, a fast algorithm for rate allocation based on channel partition and two-way rate selected source, fixed-length packet mode and fixed-length channel grouping apply. Simulation results show that the algorithm performance with other algorithms are similar, and a lower computational complexity. In addition, for based on the channel condition feedback adaptive signal joint source and channel coding (JSCC) system, the improved sliding window bit rate selection, channel partition and bit rate choices are more accurate and improve the transmission performance further, for bandwidth is limited. Progressive image transmission under the average transmitted power is limited, this paper proposes an embedded source coding and Turbo Coded Modulation (T-TCM) adaptive source-channel joint coding and modulation strategy. Limited maximum distortion and loss of embedded code true - rate function monotonically non-increasing, the objective function by the average end-to-end distortion is minimized converted to the average throughput, simplifying the the best fading zoning and adaptive Parameters of the 2. joint source channel decoding. This paper analyzes and compares the variable-length code two types of source-channel decoder (JSCD) method: source control channel decoding (SCCD) and source-channel iterative decoding (ISCD), in-depth study of the residual redundancy of the source I and variable length codeword free distance decoding performance. And improved of the the ISCD method of decoding structure for channel coding system encoding. Extract information in the recipient first sequence soft decoding, the likelihood ratio as the first iteration of a priori information of the channel decoder. The structure cleverly the SCCD methods and ISCD combine to accelerate the convergence of the iteration. Finally, the transmission and decoding of the image source simulation experiment to test the effectiveness and feasibility of joint source channel decoding method

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