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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
coded modulation
出版社: 通訊工程研究所
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摘要: 為了減緩通道對無線通訊系統的影響,接收訊號的分集性時常被提出及採納。但是受限於成本及體積大小的限制,不是每個通訊裝置都可以裝設多支天線達到接收訊號分集性的目的;合作式通訊系統可以透過一個中繼點幫忙前送訊號,並在目的點建立一個虛擬的天線陣列達到接收訊號的分集性之目的卻又不必增加額外的天線及硬體花費。而我們的研究要討論如何將籬笆型編碼調變加入在解碼前送式之合作式通訊系統中,並且設計相對應之傳輸協定。不同於傳統的解碼前送式通訊系統在中繼點是前送硬解碼訊號;在我們的系統中,中繼點會前送軟解碼的訊號給目的點,再將多樣性的軟解碼訊號合併達到接收訊號分集性的目的。其中我們會將軟解碼之資訊做截斷與量化,使得傳送得以減少不必要的資訊以及數位化其軟解碼資訊。我們會以軟解碼資訊中每個階段之最小值的分布來找到截斷的值,並且以均勻量化的方式去量化數據。最後我們會用電腦模擬的方式去比較各個參數或其他傳輸之通訊協定的性能表現。
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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