Chen Zhigang,Zhang Taiyi,Liu Haiyuan
(School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract: A new data-aided carrier frequency offset (CFO) estimation
algorithm was proposed for orthogonal frequency division multiplexing (OFDM) systems. The
algorithm estimates CFO by exploiting the characteristics of correlative coded OFDM
systems in the frequency domain, which increases the tracking range of CFO. Meanwhile,CFO
estimation error caused by intercarrier interference is removed by using an improved
iterative residual CFO estimation method. Simulation results show that the algorithm
outperforms traditional data-aided estimation algorithms,the tracking range is increased
to (-1,1) and the variance of CFO estimate is visibly improved at higher signal to noise
ratios.
Keywords: orthogonal frequency division multiplexing; carrier frequency offset;
intercarrier interference