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多天线正交频分复用(M IM O-OFDM)系统作为一种高速率无线通信的有效方式,其信道估计技术占有非常重要的位置。基于M IM O-OFDM系统的导频设计准则及特性,该文提出一种多径M IM O信道下用于多径定位和时域信道估计的算法。该算法从时域出发,首先利用所设计导频在时域上的循环移位正交性来获取多径信道的定位,从而利用时域导频符号来获取多径信道时域响应信息。仿真实验结果表明相比传统的频域信道估计插值算法,该算法在较低运算复杂度下可以获得信道估计性能的明显改善,同时作为导频符号的G o lay互补码有效降低OFDM系统功率峰均比(PAPR)2~5 dB。
Multi-antenna Orthogonal Frequency Division Multiplexing (M IM O-OFDM) system as an efficient way of high-rate wireless communication, its channel estimation technology occupies a very important position. Based on the pilot design criteria and characteristics of M IM O-OFDM system, this paper proposes an algorithm for multipath locating and time-domain channel estimation under multi-path MIMO channel. The algorithm starts from the time domain. Firstly, the orthogonality of the cyclic shift in the time domain of the designed pilot is used to obtain the location of the multipath channel, so that the time domain pilot symbol is used to obtain the time domain response information of the multipath channel. The simulation results show that compared with the traditional interpolation algorithm of frequency domain channel estimation, this algorithm can obtain significant improvement of channel estimation performance with lower computational complexity. Meanwhile, G o lay complementary code as the pilot symbol effectively reduces the power peak of OFDM system Average (PAPR) 2 ~ 5 dB.