分析了加窗和实信号情况下相干线谱检测器的检测性能。从频谱泄漏现象出发,通过对实信号做加窗处理,有效地降低了信号傅里叶变换后频谱泄漏的旁瓣级,提升了弱信号的探测能力;针对分段处理时同一频率不同数据段出现的相位差,采用相位补...分析了加窗和实信号情况下相干线谱检测器的检测性能。从频谱泄漏现象出发,通过对实信号做加窗处理,有效地降低了信号傅里叶变换后频谱泄漏的旁瓣级,提升了弱信号的探测能力;针对分段处理时同一频率不同数据段出现的相位差,采用相位补偿的方法,实现了各段数据的相干叠加。理论分析和计算机仿真表明,相比于平均功率谱检测器(Average Power Processor,AVGPR),加窗相位补偿检测器(Window Phase-Compensated Processor,WPCPR)有10 lg L(L为分段数)信噪比的提高,从而拓宽了相干线谱检测的适用范围。此外,还从频域波束形成的角度,给出了WPCPR能提高信噪比的一种物理解释,并指出了仿真中信噪比增益与理论值存在差异的原因。展开更多
A novel iterative technique,the phase descent search(PDS) algorithm,for M-ary phase shift keying(M-PSK) symbols detection was proposed.This technique constrained the solution to have a unit magnitude and it was based ...A novel iterative technique,the phase descent search(PDS) algorithm,for M-ary phase shift keying(M-PSK) symbols detection was proposed.This technique constrained the solution to have a unit magnitude and it was based on coordinate descent iterations where coordinates were the unknown symbol phases.The PDS algorithm,together with a descent local search(also implemented as a version of the PDS algorithm),was used multiple times with different initializations in a proposed multiple phase detector;the solution with the minimum cost was then chosen as the final solution.The simulation results show that for highly loaded multiuser scenarios,the proposed technique has a detection performance that is close to the single-user bound.The results also show that the multiple phase detector allows detection in highly overloaded scenarios and it exhibits near-far resistance.In particular,the detector has a performance that is significantly better,and complexity that is significantly lower,than that of the detector based on semi-definite relaxation.展开更多
文摘分析了加窗和实信号情况下相干线谱检测器的检测性能。从频谱泄漏现象出发,通过对实信号做加窗处理,有效地降低了信号傅里叶变换后频谱泄漏的旁瓣级,提升了弱信号的探测能力;针对分段处理时同一频率不同数据段出现的相位差,采用相位补偿的方法,实现了各段数据的相干叠加。理论分析和计算机仿真表明,相比于平均功率谱检测器(Average Power Processor,AVGPR),加窗相位补偿检测器(Window Phase-Compensated Processor,WPCPR)有10 lg L(L为分段数)信噪比的提高,从而拓宽了相干线谱检测的适用范围。此外,还从频域波束形成的角度,给出了WPCPR能提高信噪比的一种物理解释,并指出了仿真中信噪比增益与理论值存在差异的原因。
文摘A novel iterative technique,the phase descent search(PDS) algorithm,for M-ary phase shift keying(M-PSK) symbols detection was proposed.This technique constrained the solution to have a unit magnitude and it was based on coordinate descent iterations where coordinates were the unknown symbol phases.The PDS algorithm,together with a descent local search(also implemented as a version of the PDS algorithm),was used multiple times with different initializations in a proposed multiple phase detector;the solution with the minimum cost was then chosen as the final solution.The simulation results show that for highly loaded multiuser scenarios,the proposed technique has a detection performance that is close to the single-user bound.The results also show that the multiple phase detector allows detection in highly overloaded scenarios and it exhibits near-far resistance.In particular,the detector has a performance that is significantly better,and complexity that is significantly lower,than that of the detector based on semi-definite relaxation.
