OFDM系统中基于导频的TGn信道估计

摘要

正交频分复用(OFDM)是一种正交的多载波复用技术,信道估计技术作为正交频分复用系统中的关键技术得到了广泛关注.研究了OFDM系统中基于导频的TGn D信道估计.基于导频的信道估计首先需要对训练序列进行信道频域响应估计,利用本地训练序列和接收到的训练序列进行最小二乘估计得到;随后再计算每个OFDM符号中导频子载波的信道频域响应;对导频子载波的信道频域响应进行插值,可得到数据符号的信道信息.常用的插值方法为线性插值法和平均值法.仿真对比了两种算法的估计效果,仿真结果表明平均值法计算量小,得到的信道估计效果更佳,易于硬件实现.%Frequency Division Multiplexing (OFDM) is a multiplexing technology of orthogonal multi-carrier. TGn D channel estimation technology, as the key technology in OFDM Communication system, is studied in this paper. The channel estimation based on pilot LS estimation is used to calculate training sequence channel response in frequency domain, then the pilot carriers of each symbol channel response in frequency domain are calculated, and the channel frequency response of each OFDM symbol pilot sub carrier, linear interpolation and average of pilot channel information are studied. The simulation results show that average algorithm is better with lower bit error rate and low computational cost, and it is easy to realize on hardware.