存在定时偏移的UFMC系统信号与干扰分析

通用滤波多载波（universal filtered multi-carrier，UFMC）接收机接收到的信号到达时间与预期到达时间不一致时，会产生定时偏移（timing offset，TO），引入符号间干扰（inter symbol interference，ISI），从而破坏子载波正交性造成通信质量下降。为了分析TO对UFMC系统的影响，本文研究存在TO的UFMC系统信号和干扰分析，推导其数学表达式，数值计算并分析对比不同波形滤波器长度与不同定时偏移下的信干比（signal to interference ratio，SIR），仿真对比不同情形的误符号率（symbol error rate，SER）。结果表明，定时偏移数值与信号干扰强度呈正向相关，滤波器长度与系统SER数值呈反向相关。

Signal and Interference Analysis of UFMC System with Timing Offset

As the actual arrival time of a signal arriving universal a filtered multi-carrier (UFMC) receiver is inconsistent with the expected arrival time, timing offset (TO) occurs, which introduces inter symbol interference (ISI), destroys the orthogonality of subcarriers, and decreases the communication quality. In order to analyze the influence of TO on UFMC systems, this paper analyzes the signal and interference of UFMC systems with TO, derives corresponding theoretical expressions, numerically calculates and compares the signal to interference ratio (SIR) under different waveform filter lengths and different TOs, and simulates and compares the symbol error rate (SER) of UFMC systems in different situations. Simulation results show that the value of TO is positively correlated with the signal interference intensity, and the filter length is inversely correlated with the SER of systems.