定时误差对时域正交调制系统影响分析

非正弦时域正交调制是一种新颖的调制方式,可快速提高系统的单位频带利用率。针对该非正弦时域正交调制系统的解调接收和定时误差的影响问题,在最小差错概率准则下分析了理想同步情况下系统相关接收的误码率性能,公式推导了由于定时误差产生的干扰分量,并通过仿真定量分析了定时误差对误码性能的影响。理论分析和仿真结果表明:该调制系统对定时误差非常敏感,定时误差的存在会同时引起支路间干扰和码间干扰。

Timing Error Effects on Orthogonal Modulation System in Time Domain

Nonsinusoidal orthogonal modulation in time domain is a novel method which can improve the bandwidth efficiency quickly.For the issue of demodulation and timing error effects of the system,based on the Rule of Minimal Error Probability,the BER performance is analyzed when the system is ideally synchronized,the formula of interference component caused by timing error is derived,meanwhile,the impact of timing error on BER performance is simulated.The mathematical deduction and simulation results both show that the non-sinusoidal modulation system is sensitive to the timing error,and the existence of timing error may cause interchannel interference and intersymbol interference simultaneously.