摘要
基于Parseval定理和基扩展(BEM)信道模型,可实现栅格正交频分复用(L OFDM)系统双散射信道下时延扩展的有效估计。同时利用时延扩展参数的估计值近似信道功率时延剖面(P DP),提出了双散射信道下基于近似PDP的线性最小均方误差(LMMSE)信道估计算法,实现了LOFDM系统信道响应和时延扩展的联合估计。理论与仿真分析表明,该算法具有较好的归一化均方误差性能,且系统基于该算法估计的信道响应进行解调时具有良好的误符号率(SER)性能。
The delay spread of doubly-dispersive channels in a lattice orthogonal frequency divi- sion multiplexing （LOFDM） system can be effectively estimated by using the Parseval theorem and the basis expansion model （BEM）. ~Furthermore, using the estimated value of the delay spread as an approximation of the power delay profile （PDP） of the channel, a linear minimum mean square error （LMMSE） channel estimation algorithm for doubly-dispersive channels based on the approximate PDP is proposed, thus realizing the joint estimation of both the delay spread and the channel response of an LOFDM system. The theoretical analysis and the simulation re- sult demonstrate that the proposed algorithm has a good mean square error （MSE） performance. And the symbol error rate （SER） performance is good when signals are demodulated based on the channel response estimated by the algorithm.
出处
《指挥信息系统与技术》
2013年第5期35-38,62,共5页
Command Information System and Technology
关键词
栅格正交频分复用
功率时延剖面
双散射信道
联合估计
lattice orthogonal frequency division multiplexing （LOFDM）
power delay profile（PDP）
doubly-dispersive channel
joint estimation
