基于DVB-T的OFDM系统的信道估计研究  

The Research of Channel Estimation in OFDM for DVB-T

作　　者：张华清[1] 吴娱[1] 

机构地区：[1]中国传媒大学信息工程学院,北京100024

出　　处：《中国传媒大学学报（自然科学版）》2009年第4期62-66,84,共6页Journal of Communication University of China：Science and Technology

摘　　要：DVB-T标准中采用了OFDM编码调制技术来提高系统的频谱利用率和抗多径干扰的能力,为了能够准确地解调OFDM信号,需要对接收到的信号进行信道估计。而基于导频的信道估计是通过导频子信道的响应计算出整个信道的响应,它能够很好地跟踪信道的变化,在计算复杂度不是很高的情况下能够达到较好的性能,是一种比较实用的信道估计方法。本文讨论了DVB-T系统中基于导频的信道估计方法,并提出了一种时频二维插值信道估计方法。仿真结果表明,二维插值信道估计较一维插值具有更好的误码率性能。In DVB-T standard, OFDM was recommended which will benefit the system with better utilization of spectrum and anti-interference to multiplepath. In order to demodulate OFDM signal accurately, channel estimation is needed for received signal. Channel estimation based on pilot signal is one approach to estimate channel specification which measures the response of the pilot sub-channel to be analogy of which for whole channel＇ s. This estimation approach is superior in tracking the variance of channel and can achieve satisfied performance. It is one practical way to do channel estimation. In this article, the channel estimation approach based on pilot is discussed for DVB-T system. A new time-frequency 2-dimension interpolation estimation method is recommended. The simulation shows that this 2-dimension interpolation method possess better error rate performance than the single dimension.

关 键 词：DVB-T系统 OFDM 导频分布 信道估计 最小平方(LS)估计算法 插值算法 误码率 

分 类 号：TN934.3[电子电信—信号与信息处理]