相關信源編碼及在中繼協(xié)作通信中的應用
[Abstract]:With the rapid development of multimedia mobile communication technology, the demand for reliable and effective transmission of information is increasing day by day. However, due to the influence of wireless bandwidth resources and multipath fading, it is difficult to achieve high-speed and reliable data transmission. In order to solve this contradiction, we must adopt new communication theory and technology. Relay cooperative communication technology acquires spatial diversity through relay transmission, which avoids the influence of multipath fading. In addition, it can reduce user transmission power and extend network coverage. It is an efficient wireless resource allocation solution. Compress-and-forward CF is a good choice in relay transmission scheme. The relay node compresses and forwards the received signal by using the correlation between the received signal and the destination node. Theoretical research shows that the compression-forwarding strategy can obtain many reachable rate points which other strategies cannot obtain, but the practical CF scheme lags far behind the theory. This paper mainly focuses on the encoding and decoding methods of related sources and the design of CF relay cooperative communication scheme. In this paper, the related theories of source coding are introduced, including source coding, source coding and its distributed coding scheme. The joint source-channel coding (JSCC) of correlated sources takes the source coding and channel coding into account, which makes the system achieve the best balance point and become the research hotspot in the field of modern coding. Then, based on the encoding and decoding theory of Turbo code, the joint source-channel encoding and decoding algorithm of two correlated sources in Gao Si channel is studied. It includes the generation of related sources, the joint source-channel coding of the source, the joint source-channel decoding algorithm of the destination node and so on. The performance of the system with different correlation coefficients is simulated and it is proved that it is very close to the limit value of the combination of Shannon and Slepian-Wolf theory. Finally, a decode-Compress-and-forward (DCF) relay transmission scheme is studied for a three-node relay channel model. The relay node decodes, quantizes and encodes the received source node information and forwards it to the destination node. Using the correlation between direct signal and relay received signal, the joint decoding algorithm of correlation source is used to decode the node. The effects of different tradeoff factors f and the location of relay nodes on the system performance are analyzed and compared with the existing Decode-Amplify-Forward-DAF schemes.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN911.21;TN929.5
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