文档介绍：
AWGN 信道中一种改进 OFDM 系统信道估
计算法
任文超,姜军**
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(北京邮电大学信息与通信工程学院,北京 100876)
摘要:基于梳状导频的正交频分复用(OFDM)系统的信道估计算法主要有 LS 算法和 MMSE
算法,数据域的信道估计则通过线性插值、二阶插值、低通插值和时域插值等。本文介绍了
在 AWGN 信道下 OFDM 系统的一种基于最小均方误差准则的线性相位插入算法,并在
16QAM 调制方式下对各种插入算法进行了基于误码率的性能对比仿真。
关键词:信道估计;正交频分复用;最小均方误差;AWGN
中图分类号:
Modified Channel Estimation Method for OFDM
Communication System In AWGN Channel
REN Wenchao, JIANG Jun
(Information munications Engineering School, Beijing University of Posts &
munications, Beijing 100876)
Abstract: LS and MMSE is the main channel estimation algorithm in OFDM system of
Comb-Type Pilot Arrangement. Data domain’s channel estimation is implemented by
interpolation including linear interpolation, second order interpolation, low-pass interpolation,
spline cubic interpolation, and time domain interpolation. In this paper, we introduce a linear
phrase interpolation algorithm which is based on Minimum Mean Square Error criterion. We have
compared the performance of our proposed channel estimator with conventional channel
estimators by measuring bit error rate with 16QAM.
Keywords: Channel Estimation; OFDM; Least Mean-square Error; AWGN
0 引言
无线通信中采用 OFDM 技术来抵抗多径,在多径信道条件下基于梳状导频的 LS 和
MMSE 是常用的信道估计算法[1]。在终端测试中或者空旷的场景下,可认为信道条件足够理
想仅有加性高斯白噪声和由于通信双方没有完全同步而带来的采样延时,利用 LS 信道估计
算法估计出导频出的信道响应,接下来估计数据域的信道响应时传统的方法是进行插值,典
型的插值算法有线性插值、二阶插值、低通插值和 FFT