频偏与高速移动场景中的协作OFDM系统性能分析

Performance Analysis of Cooperative OFDM Systems in Presence of Carrier Frequency Offset and in High Mobility Environment

理论分析频偏与信道时变引起的子载波间干扰(ICI),以及其对协作正交频分复用(OFDM)系统接收性能的影响,并通过数值仿真得到ICI的分布及系统误码率.实验结果表明:一方面频偏与信道时变共同作用下的ICI更加严重,并由此导致系统性能的严重恶化;另一方面,频偏与信道时变作用下的ICI随子载波间隔的增加而减小.说明低复杂度ICI均衡是可行的.

Intercarrier Interference （ICI） caused by frequency offset and channel time variation and the resulting impac- tions on the receiver performance of the cooperative orthogonal frequency division multiplexing （OFDM） system are ana- lyzed theoretically, and the ICI distributions along with the system bit error rate are also obtained by numerical simula- tions. The simulation results show that： on one hand, the ICI under both frequency offset and channel time variation be- comes more severe, and accordingly causes the system performance degraded severely, and on the other hand, the ICI un- der both frequency offset and channel time variation decreases with the increasing of subcarrier intervals, which indicate that the low complexity ICI equalization is possible.