无线通信中基于导频的OFDM信道估计算法仿真研究

Analysis of Channel Estimation Algorithms Based on Pilot for Radio OFDM System

提出了利用三次样条插值算法和最小均方误差(MMSE)算法代替线性插值算法和基于变换域的插值算法对OFDM系统的数据符号处的信道系数进行估计,并且在导频间隔不同时对4种算法进行了比较分析。仿真结果表明:改进后的算法可以大大节省系统的信噪比增益;在同时考虑计算复杂度和估计性能的条件下,导频宽度不同时,应采用不同的插值算法。当子信道具有频率选择性时,三次样条插值算法是最佳选择。

This paper suggests that the cubic spline insertion value and minimum mean square error（MMSE） algorithms be used to replace the linear insertion value algorithm and the invertion value algorithm based on the transform field to estimate the number of signal channel coefficiet at data symbals in the OFDM system. Also, this paper makes a comparative analysis of 4 kinds of algorithms at the different intervals of pilot carriers. The simulation results indicate that the improved algorithms can greatly save the signal noise ratio benefits; and that in the case of considering calculation complexity and estimation performances, the insertion value algorithms of different kinds are adopted when the widths of pilot carriers are different, and that when the sub-signal channel has the frequency selection, the cubic spline insertion value algorithm is the best selection.