Performance of OFDM Systems with Residual Carrier Frequency Offset over Time-varying Rayleigh Channels
In this paper, the performance of orthogonal frequency division multiplexing (OFDM) systems with residual carrier frequency offset over time-varying Rayleigh channels is investigated. The power of different received signal components (the desired signal, the ICI signals caused by frequency offset and channel variations, and noise signals)are firstly calculated and analyzed, and the SINR (Signal to Interference plus Noise ratio) and BER (Bit Error Rates)calculations for 16-QAM OFDM systems are then investigated. Analytical analysis and computer simulations show the following important results: (1) residual frequency offset and channels time variations greatly degraded the performance of OFDM systems; (2) the intercarrier interference (ICI) energy caused by channel variations or frequency offset is concentrated in cyclically adjacent subcarriers, which is important for developing low complexity ICI cancellation techniques; (3) the influence of residual carrier frequency offset on OFDM system performance can be modeled as the effects of equivalent channels time variations, and a time-varying channel model including the residual carrier frequency offset effect is proposed.
Guangfa Dai Hongwen Tang Shaoping Chen
Department of Electronics and Information Engineering South-Central University for Nationalities, Wuhan 430074, China
国际会议
2006年IEEE信息理论国际会议(Proceedings of 2006 IEEE Information Theory Workshop ITW06)
成都
英文
517-521
2006-10-22（万方平台首次上网日期，不代表论文的发表时间）