Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/6462
標題: 一個在合作式通訊系統中新的適應性調變方式
A novel adaptive modulation scheme in cooperative communication systems
作者: 何翰昇
Ho, Han-Sheng
關鍵字: Cooperative communications;合作式通訊系統;Adaptive modulation;Decode-and-Forward;適應性調變;解碼前送式
出版社: 電機工程學系所
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摘要: 
Cooperative communication has became popular research recently. Since the mobile users can help sending the information each other in cooperative communication system, it can achieve cooperative diversity similar to the multiple-input multiple output (MIMO) system and overcome some limitation of MIMO systems. Furthermore, the cooperative communication with adaptive modulation (AM) can improve the system performance. The adaptive modulation can increase the data throughput and satisfy the required error rate. In general, we use thresholds to decide the transmission rate. However, the fixed thresholds cause ine ciency of the system performance. Therefore, a novel adaptive modulation method is proposed in this thesis. We can improve the performance intensely by changing the thresholds and modulation scheme of each average signal to noise rate (SNR). This method can be compared to fixed thresholds and verify that our proposed method is better than fixed threshold. We also compare our method to optimum thresholds and the results prove complexity of our proposed method is lower than optimum thresholds.
URI: http://hdl.handle.net/11455/6462
其他識別: U0005-1508201114142700
Appears in Collections:電機工程學系所

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