同信道干扰下中继选择网络的性能

PERFORMANCE OF RELAY SELECTION NETWORK IN THE PRESENCE OF CO-CHANNEL INTERFERENCE

使用端到端等效信干噪比的累积分布函数表达式,推导了瑞利衰落信道上同信道干扰下中继选择网络分别在M进制相移键控调制下的平均误符号率闭合表达式、M进制正交幅度调制下的平均误符号率的近似表达式和信道容量上界表达式。数值计算和仿真结果表明:高信干噪比时,M进制相移键控调制的平均误符号率理论结果与仿真结果相吻合,M进制正交幅度调制的平均误符号率的近似表达式具有较高的精度;中继的数目越多,信道容量的仿真结果与其理论上界越紧。

Based on the expression of cumulative distribution function( CDF) of the end-to-end equivalent signal-to-interference and noise ratio,new closed-form formula for the average symbol error probability( SER) under M-ary phase-shift keying( MPSK),closedform approximation formula for the average SER under M-ary quadrature amplitude modulation( MQAM) and an upper bound on channel capacity are derived respectively. Both numerical and simulation results show that in the high SINR region,the exact theoretical results of the average SER under MPSK match the simulation results,and the approximation theoretical results of the average SER under MQAM are highly accurate; The simulation results of the channel capacity are tighter with the upper bounds of the theoretical results with the increase of the number of the relay.