计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2014年
7期
221-224
,共4页
协作通信%中继选择%译码转发%门限比较%功率分配
協作通信%中繼選擇%譯碼轉髮%門限比較%功率分配
협작통신%중계선택%역마전발%문한비교%공솔분배
cooperative communications%relay selection%decode-and-forward%threshold comparison%power allocation
中继选择是协作通信领域的关键问题，尤其对于电池供电能量有限的无线移动设备。与基于两跳瞬时信道信息的中继选择算法不同，介绍了一种基于源到中继信道信息的SR门限比较算法。该算法在中继节点设置合适的信噪比门限，将源和多个中继节点的信噪比与门限值比较，选择出最优中继进行传输。在该算法的基础上，理论分析了最优中继及目的节点处的输出信噪比，仿真结果表明该算法可以获得与基于两跳瞬时信道信息算法相近的性能。但由于中继只需考虑自身和源节点之间的瞬时信道状态，所以中继的功耗大大减小，算法的复杂性降低。
中繼選擇是協作通信領域的關鍵問題，尤其對于電池供電能量有限的無線移動設備。與基于兩跳瞬時信道信息的中繼選擇算法不同，介紹瞭一種基于源到中繼信道信息的SR門限比較算法。該算法在中繼節點設置閤適的信譟比門限，將源和多箇中繼節點的信譟比與門限值比較，選擇齣最優中繼進行傳輸。在該算法的基礎上，理論分析瞭最優中繼及目的節點處的輸齣信譟比，倣真結果錶明該算法可以穫得與基于兩跳瞬時信道信息算法相近的性能。但由于中繼隻需攷慮自身和源節點之間的瞬時信道狀態，所以中繼的功耗大大減小，算法的複雜性降低。
중계선택시협작통신영역적관건문제，우기대우전지공전능량유한적무선이동설비。여기우량도순시신도신식적중계선택산법불동，개소료일충기우원도중계신도신식적SR문한비교산법。해산법재중계절점설치합괄적신조비문한，장원화다개중계절점적신조비여문한치비교，선택출최우중계진행전수。재해산법적기출상，이론분석료최우중계급목적절점처적수출신조비，방진결과표명해산법가이획득여기우량도순시신도신식산법상근적성능。단유우중계지수고필자신화원절점지간적순시신도상태，소이중계적공모대대감소，산법적복잡성강저。
Relay selection is a key problem in the field of cooperative communications, especially for mobile devices using battery to supply power. Different from the relay selection algorithm which is based on the instantaneous Channel State Information(CSI)of two hops, the proposed algorithm which is called threshold comparison algorithm is just based on the instantaneous CSI of the first hop. In this algorithm, a predetermined threshold is set at the relay node and is compared with the Signal-to-Noise Ratio(SNR)between source and relay node. The optimal relay is selected. This paper analyzes the output SNR at the suboptimal relay node theoretically. The simulation results show that the proposed algorithm can achieve similar performance compared with the former algorithm which is based on the instantaneous CSI of two hops. However, it simply considers the instantaneous CSI between the relay node and the source node, so the relay power consumption as well as the complexity of the algorithm is greatly reduced.
