摘要
针对信道冲击响应的稀疏性,提出了一种OFDM时域信道估计方法。该方法利用正交匹配追踪估计出信道冲击响应中非零抽头系数的位置和大小,通过DFT得到信道频域响应。算法复杂度低,需要的导频数量少,可以有效地提高系统的吞吐量。仿真结果表明：与传统方法相比,在导频数量相同时,该方法具有较好的误码率（BER）和均方误差（MSE）性能。
A channel estimation algorithm for OFDM systems in time domain is proposed by exploiting the sparsity property of channel impulse response. The position and the value of nonzero components in the channel impulse response were estimated By using orthogonal matching pursuit, and then, we can get the fre-quency response through DFT. The algorithm can improve the throughput effectively since it needs a small number of pilot symbols and has a low computation complexity. Simulation results show that the proposed al- gorithm has a better BER and MSE performance compared with the traditional Least Square algorithm which have the same pilots.
出处
《通信对抗》
2012年第1期6-8,15,共4页
Communication Countermeasures
关键词
正交频分复用
稀疏信道
正交匹配追踪
信道估计
orthogonal frequency division multiplexing （OFDM）
sparse channel
orthogonal matching pur-suit （OMP）
channel estimation
