基于空子载波的信噪比估计算法  

A signal to noise ratio estimation algorithm by void subcarriers

作　　者：蔡梦[1] 张科峰[1] 邹雪城[1] 吴兰春[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2010年第3期69-71,83,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划资助项目(2006AA01Z226)

摘　　要：为了解决传统信噪比估计算法在多径信道下性能显著降低且复杂度较高的问题,提出一种基于空子载波的高性能信噪比估计算法.该算法联合数据辅助和非数据辅助的方法,利用空子载波进行噪声能量的估计,通过接收信号估计噪声与发送信号的能量之和.该算法不但能够在高斯信道下取得较好性能,而且可以提高系统在多径信道下的性能,对多普勒频移和信道时延扩展均不敏感.实验结果表明:与4种传统算法相比,该算法在多径信道下性能提升93.3%,并且具有较低的复杂度.The traditional signal to noise ratio （SNR） estimation algorithms often degrade dramatically in multi-path channel and are not efficient in computation.A high performance SNR estimation algorithm was presented,in which the data aided and non-data aided methods were combined.The void subcarriers were used to estimate the energy of noise,and the received data was used to do the energy of transmitted data and noise.The proposed algorithm not only can perform well in the additive white Guassian noise （AWGN） channel,but also improves the system performance in the multi-path channel.It is not sensitive to Doppler shift and multi-path delay spread.Simulation results show that the proposed method yields an improvement bit error rate of 93.3% compared with the four traditional algorithms at a much lower complexity.

关 键 词：无线局域网 正交频分复用 信噪比 空子载波 多径信道 导频 

分 类 号：TN911.72[电子电信—通信与信息系统]