关键词: 正交频分复用（OFDM）, 信道估计, 最小平方（LS）算法, 有限长单位冲激响应（FIR）滤波器, 均方误差（MSE）

Abstract: LS algorithm has been widely used in the OFDM channel estimation because of its simple operation. In actual systems, however, the algorithm is influenced by the noise of Inter-Carrier Interference（ICI） due to the presence of non-ideal factors. Meanwhile channel response will be interfered with outside noise in the burst transmission, which makes the estimated channel response amplitude fluctuate a certain range and have spikes and glitches. In order to solve this problem, an OFDM channel estimation based on the optimization of the FIR filter（Chebyshev filter） algorithms is proposed. Chebyshev filter attenuates quickly in the transition zone, and the error between it and the ideal filer frequency response curve is the smallest. So this algorithm can guarantee the performances of the local frequency are optimal compared to the traditional filer algorithm by simulation. The unexpected noise is introduced in the white Gaussian channel environment and a simulation of the proposed scheme is given. The simulation results show that this method can effectively eliminate the spikes and glitches in the passband caused by burst transmission.

Key words: Orthogonal Frequency Division Multiplexing（OFDM）, channel estimation, Least Square（LS） algorithm, Finite Impulse Response（FIR） filter, Mean Squared Error（MSE）