华南理工大学学报(自然科学版)
華南理工大學學報(自然科學版)
화남리공대학학보(자연과학판)
Journal of South China University of Technology (Natural Science Edition)
2015年
9期
54-59
,共6页
娄毅%马永奎%赵洪林%郑岩
婁毅%馬永奎%趙洪林%鄭巖
루의%마영규%조홍림%정암
通信网络%协作通信%选择组合%放大转发%Nakagami-m衰落
通信網絡%協作通信%選擇組閤%放大轉髮%Nakagami-m衰落
통신망락%협작통신%선택조합%방대전발%Nakagami-m쇠락
communication networks%cooperative communication%selection combining%amplify-and-forward%Nakagami-m fading
在差分协作分集系统中,传统的差分最大比合并器(MRC)需要各链路的二阶统计量作为合并器的权。选择合并器(SC)可以直接根据接收信号构造决策变量,接收机根据决策变量选择接收链路并进行非相关检测。文中分析了使用 SC 的差分放大转发(AF)系统在 Nakagami-m 衰落信道模型下的性能,应用矩生成函数的方法推导出系统误比特率的精确解析表达式和中断概率,并给出了最优功率分配。理论分析和仿真结果表明:使用SC、MRC 方案的差分 AF 系统性能均优于直接传输;与 MRC 方案相比,SC 方案不需要任何信道状态信息,在降低复杂度的同时可以获得近似于 MRC 方案的性能。
在差分協作分集繫統中,傳統的差分最大比閤併器(MRC)需要各鏈路的二階統計量作為閤併器的權。選擇閤併器(SC)可以直接根據接收信號構造決策變量,接收機根據決策變量選擇接收鏈路併進行非相關檢測。文中分析瞭使用 SC 的差分放大轉髮(AF)繫統在 Nakagami-m 衰落信道模型下的性能,應用矩生成函數的方法推導齣繫統誤比特率的精確解析錶達式和中斷概率,併給齣瞭最優功率分配。理論分析和倣真結果錶明:使用SC、MRC 方案的差分 AF 繫統性能均優于直接傳輸;與 MRC 方案相比,SC 方案不需要任何信道狀態信息,在降低複雜度的同時可以穫得近似于 MRC 方案的性能。
재차분협작분집계통중,전통적차분최대비합병기(MRC)수요각련로적이계통계량작위합병기적권。선택합병기(SC)가이직접근거접수신호구조결책변량,접수궤근거결책변량선택접수련로병진행비상관검측。문중분석료사용 SC 적차분방대전발(AF)계통재 Nakagami-m 쇠락신도모형하적성능,응용구생성함수적방법추도출계통오비특솔적정학해석표체식화중단개솔,병급출료최우공솔분배。이론분석화방진결과표명:사용SC、MRC 방안적차분 AF 계통성능균우우직접전수;여 MRC 방안상비,SC 방안불수요임하신도상태신식,재강저복잡도적동시가이획득근사우 MRC 방안적성능。
In differential cooperative diversity systems,the traditional maximal ratio combiner (MRC)needs the second-order statistics of all channels as the weights of the combiner.Meanwhile,a selection combiner (SC)can form a decision variable based on the received signals,and the link with the maximum magnitude of the decision variable is chosen for non-coherent detection.In this paper,the performance of a differential amplify-and-forward system employing a SC is analyzed.Then,an exact analytical expression of the average bit error rate (BER)and the outage probability are derived by means of the moment generating function (MGF)method and the optimal power allocation point is put forward.Theoretical analysis and simulation results demonstrate that the performance of the differential amplify-and-forward system employing the SC and the MRC is better than that of direct transmission, and in comparison with the MRC scheme,the SC scheme without any channel state information reduces the com-plexity and achieves a similar performance.