计算机工程
計算機工程
계산궤공정
COMPUTER ENGINEERING
2015年
5期
139-143
,共5页
协作通信%中继选择%功率分配%物理层安全%安全中断概率%解码转发
協作通信%中繼選擇%功率分配%物理層安全%安全中斷概率%解碼轉髮
협작통신%중계선택%공솔분배%물리층안전%안전중단개솔%해마전발
cooperative communication%relay selection%power allocation%physical layer security%Secrecy Outage Probability(SOP)%Decode-and-Forward(DF)
传统的最佳中继选择方法仅依赖于合法用户的信道条件，在存在窃听用户的环境中无法保证信息传输的安全性与私密性。针对该问题，以最小化系统安全中断概率为目标，综合考虑合法用户与窃听用户的信道状态信息，提出一种新的机会中继选择方法。针对解码转发协作通信网络，给出系统总发射功率受限条件下的最佳功率分配方案，并在此基础上设计最佳中继节点的选择方法，推导得到系统安全中断概率的闭式表达式。仿真结果验证了该闭式表达式的正确性，并表明与传统中继选择方法相比，提出的中继选择方法可显著降低系统的安全中断概率。
傳統的最佳中繼選擇方法僅依賴于閤法用戶的信道條件，在存在竊聽用戶的環境中無法保證信息傳輸的安全性與私密性。針對該問題，以最小化繫統安全中斷概率為目標，綜閤攷慮閤法用戶與竊聽用戶的信道狀態信息，提齣一種新的機會中繼選擇方法。針對解碼轉髮協作通信網絡，給齣繫統總髮射功率受限條件下的最佳功率分配方案，併在此基礎上設計最佳中繼節點的選擇方法，推導得到繫統安全中斷概率的閉式錶達式。倣真結果驗證瞭該閉式錶達式的正確性，併錶明與傳統中繼選擇方法相比，提齣的中繼選擇方法可顯著降低繫統的安全中斷概率。
전통적최가중계선택방법부의뢰우합법용호적신도조건，재존재절은용호적배경중무법보증신식전수적안전성여사밀성。침대해문제，이최소화계통안전중단개솔위목표，종합고필합법용호여절은용호적신도상태신식，제출일충신적궤회중계선택방법。침대해마전발협작통신망락，급출계통총발사공솔수한조건하적최가공솔분배방안，병재차기출상설계최가중계절점적선택방법，추도득도계통안전중단개솔적폐식표체식。방진결과험증료해폐식표체식적정학성，병표명여전통중계선택방법상비，제출적중계선택방법가현저강저계통적안전중단개솔。
In cooperative communication network,a relay selection procedure is usually based on the channel conditions of legitimate channels in traditional relay selection methods,thus it is hard to guarantee the security and privacy of the transmission in the presence of eavesdroppers. To tackle this problem,an opportunistic relay selection method considering the Channel State Information ( CSI ) of both the legitimate users and the eavesdropper is proposed to minimize the Secrecy Outage Probability ( SOP ) in a cooperative Decode-and-Forward ( DF ) network. Firstly, the optimal power allocation method is given when the total transmit power of the source and relay is constrained. Based on that,the best relay selection algorithm is proposed and the closed form expression of secrecy outage probability is derived. Simulation results verify the correctness of the closed form expression of secrecy outage probability, and show that the proposed algorithm greatly reduces the secrecy outage probability of the system compared with the traditional methods.
