滤波器组多载波系统的干扰分析和性能验证

Interference analysis and performance verification of filter bank multi-carrier systems

分析了多普勒频偏以及多径时延对滤波器组多载波(FBMC)系统的影响,给出了多普勒频偏以及多径时延造成干扰的闭合定量分析式,该分析式对正交频分复用(OFDM)系统同样适用,并据此对无线多径衰落信道场景中的FBMC系统与传统OFDM系统性能进行了对比。研究结果表明,FBMC系统对多普勒频偏的抵抗性优于OFDM系统,但是系统性能会随信道多径时延的增大而降低。在多径时延相对较小的快衰落信道中,符号间干扰并非影响系统性能的主要因素,FBMC系统可以利用简单的频域均衡获得足够好的性能,仿真结果验证了这一点。

In this paper, the effect of Doppler frequency offset and multi-path delay on filter bank multi-carrier （FBMC） systems is analyzed and a closed expression for the interference caused by Doppler frequency offset and multi-path delay, which could be used in orthogonal frequency division multiplexing （OFDM） systems as well, is proposed. Based on this expression, the performance comparison between a FBMC system and an OFDM system in wireless multi-path and fading channels is conducted and the results show that FBMC systems are more robust to Doppler frequency offset than OFDM systems. However, the multi-path delay can degrade the system performance. In the fast fading channel with small multipath delay, inter-symbol interference is not the key factor to system performance. Consequently, the considerably satisfactory performance can be achieved by using the simple frequency domain equalization. This was verified by simulation.