Abstract：To solve the problem of poor performance with large amount of calculation work for traditional orthogonal frequency division multiplexing(OFDM) bandwidth blind estimation scheme at low signal to noise ratio(SNR) over multipath channel, an OFDM bandwidth blind estimation strategy with low complexity was proposed. The Welch method was adopted to estimate the power spectrum of OFDM signals. The smooth spectrum was obtained by least square polynomial fitting. The derivation of smooth spectrum was calculated to extract the maximum and minimum positions. The statistical average value was considered as the final bandwidth blind estimation value by repeating many times. The steps of OFDM bandwidth blind estimation scheme were determined by theory analysis, and the simulation experiments were conducted under multi-path channel. The simulation results show that the correct rate of the bandwidth estimate scheme is 98.9% for SNR of 0 dB with multi-path channel. Compared with traditional method, the proposed method has better estimation performance with smaller calculation work at the conditions of low SNR and multi-path channel.
刘明骞, 李兵兵, 王婧舒, 李艳玲. 低信噪比下低复杂度的OFDM信号带宽盲估计方法[J]. 江苏大学学报（自然科学版）, 2013, 34(1): 76-80.
LIU Ming-Qian, LI Bing-Bing, WANG Jing-Shu, LI Yan-Ling. Bandwidth blind estimation scheme of OFDM signals with low complexity at low SNR[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2013, 34(1): 76-80.
2013, Vol. 34 
