放大转发协作中继链路的能效性能研究  

Research on energy efficiency of amplify-and-forward relay transmission links

作　　者：陈芳芳[1] 王涛[1] 

机构地区：[1]上海大学特种光纤与光接入网重点实验室通信与信息工程学院,上海200072

出　　处：《电子测量技术》2015年第12期26-30,共5页Electronic Measurement Technology

基　　金：国家自然科学基金项目(61401266);高等学校博士学科点专项科研基金新教师类资助课题(20133108120015);上海市教育委员会科研创新项目(14ZZ096);上海市科委国际合作项目(13510721100);上海大学创新基金项目;上海高校特聘教授(东方学者)岗位计划

摘　　要：针对采用放大转发和MQAM调制的源-中继-终端的通信链路,研究了在保证终端解调误码率低于给定值的条件下,调制速率对能量效率(EE)的影响以及各个系统参数对最优能量效率的影响。推导了射频电路消耗的最小功率,进而在同时考虑电路功耗和解调能耗时得到了能效性能的函数表达式。通过数学理论分析证明能效性能是调制速率的拟凹函数,并且当调制速率增大时,能效先递增再递减。当误码率增大时,最优能效严格递增,最优调制速率严格递减。当电路功耗递增时,最优能效严格递减,最优调制速率严格递增。当接收机ML解调初始能耗递增时,最优能效严格递减;最优调制速率严格递增。The influence of modulation rate on energy efficiency（EE）and the various system parameters on the optimal EE for a source-relay-terminal communication link using amplify-and-forward（AF）protocol and MQAM are studied when bit error rate（BER）is prescribed.First,the transmission power consumption is calculated,then the total power consumption can be obtained when circuit power consumption and demodulation energy consumpton are taken into account.Finally,the expression of EE is derived and the influence of modulation rate on EE is studied.Through simulation results we find that when the modulation rate increases,the energy efficiency first increases and then decreases.When the error rate increases,the optimal EE strictly increases,the optimal modulation rate strictly decreases. When increasing the circuit power consumption,the optimal EE strictly decreasing and the optimal modulation rate strictly increasing.When the initial energy consumption increasing with ML demodulation receiver,the optimal EE strictly decreasing and the optimal modulation rate strictly increasing.

关 键 词：能量效率 调制速率 放大转发 系统参数 

分 类 号：TN925[电子电信—通信与信息系统]