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標題: 使用籬笆型編碼調變在解碼前送式之合作式通訊系統之傳輸設計
Transmission Design in Decode-and-Forward Cooperative Communication System Using TCM
作者: 周郁銘
Chou, Yu-Ming
關鍵字: cooperative communication system;合作式通訊系統;decode-and-forward;trellis-codemodulation;TCM;coded modulation;解碼前送式;籬笆型編碼調變;編碼調變
出版社: 通訊工程研究所
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The diversity technologies are often adopted to alleviate the impact of the channel variation. We introduce the concept of trellis-code modulation(TCM) into DF cooperative communication systems. Our investigation is that how to integrate TCM into the cooperative communication systems. In this work, two cooperation environments which are error-free backbond and wireless channel are considered. Not as same as the conventional DF cooperative communication with hard decoding, the soft decoding is used at the relay node in the DF protocol and design the corresponding cooperative mechanisms for our cooperation system. The results of the soft decoding of each stage of the Viterbi algorithm are then sent to the destination to be fused with those of signals from the source. Truncation and quantization of the results of the soft decoding are necessary to reduce the necessary bits to represent the results of the soft decoding. The distribution of the minimum of the branch metric helps us to find the optimal truncation level, and the uniform quantization is chosen due to its simplicity. Finally, the simulation presents the performance with some different parameters and some other transmission protocols.
其他識別: U0005-2108200918560000
Appears in Collections:通訊工程研究所

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