计算机工程
計算機工程
계산궤공정
COMPUTER ENGINEERING
2014年
10期
127-131
,共5页
协同通信%选择协同%过时信道状态信息%中断概率%分集复用折中%瑞利衰落
協同通信%選擇協同%過時信道狀態信息%中斷概率%分集複用摺中%瑞利衰落
협동통신%선택협동%과시신도상태신식%중단개솔%분집복용절중%서리쇠락
cooperative communication%selection cooperation%outdated Channel State Information(CSI)%outage probability%Diversity-multiplexing Tradeoff( DMT)%Rayleigh fading
在无线协同通信系统中，由于信道的时变特性，导致中继选择和数据发送时的信道状态信息不同。针对该问题，对基于过时反馈的选择协同策略进行研究。介绍系统模型及基于过时反馈的中继选择过程，推导系统的中断概率闭式结果和高信噪比下的近似逼近结果，通过分集复用折中性能分析得出，过时信道状态信息导致系统的最大分集阶数为2。数值仿真结果验证了理论分析的正确性，并且得到中继选择时的信道状态信息与数据发送的信道状态信息稍有不同，其中断性能就会大大降低的结论。
在無線協同通信繫統中，由于信道的時變特性，導緻中繼選擇和數據髮送時的信道狀態信息不同。針對該問題，對基于過時反饋的選擇協同策略進行研究。介紹繫統模型及基于過時反饋的中繼選擇過程，推導繫統的中斷概率閉式結果和高信譟比下的近似逼近結果，通過分集複用摺中性能分析得齣，過時信道狀態信息導緻繫統的最大分集階數為2。數值倣真結果驗證瞭理論分析的正確性，併且得到中繼選擇時的信道狀態信息與數據髮送的信道狀態信息稍有不同，其中斷性能就會大大降低的結論。
재무선협동통신계통중，유우신도적시변특성，도치중계선택화수거발송시적신도상태신식불동。침대해문제，대기우과시반궤적선택협동책략진행연구。개소계통모형급기우과시반궤적중계선택과정，추도계통적중단개솔폐식결과화고신조비하적근사핍근결과，통과분집복용절중성능분석득출，과시신도상태신식도치계통적최대분집계수위2。수치방진결과험증료이론분석적정학성，병차득도중계선택시적신도상태신식여수거발송적신도상태신식초유불동，기중단성능취회대대강저적결론。
Due to characteristics of time-varying channel in the wireless cooperative communication system,the Channel State Information( CSI) at the time of relay selection may be different from that at the time of data transmission. Aiming at this problem,the selection cooperation with outdated feedback is investigated in this paper. First,the system model and the relay selection process with outdated feedback are introduced, and the closed-form result of outage probability and closed approximation in the high SNR regime are derived. By analyzing Diversity-multiplexing Tradeoff ( DMT ) , it obtains the maximum diversity order which is 2 when the CSI used in relay selection is outdated. Finally, numerical simulation results verify the correctness of theoretical analysis,and show the outage performance will be greatly reduced when the CSI at the time of relay selection is slightly different form it at the time of data transmission.
