认知无线电中OFDM信号信噪比盲估计

刘明骞; 李兵兵; 唐宁洁; 李钊

doi:1000-436X(2011)11-0078-07

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认知无线电中OFDM信号信噪比盲估计

学术论文 | 更新时间：2024-06-05

- 认知无线电中OFDM信号信噪比盲估计
- Blind SNR estimation for OFDM signals in cognitive radio
- 通信学报 2011年32卷第11期页码：78-84
- 作者机构：
- 作者简介：
  
  [ "刘明骞（1982-），男，河南平顶山人，西安电子科技大学博士生，主要研究方向为通信信号处理、数字通信、通信对抗和认知无线电。" ]
  [ "李兵兵（1955-），男，江苏宿迁人，博士，西安电子科技大学教授、博士生导师，主要研究方向为通信信号处理、数字通信、无线通信和认知无线电。" ]
  [ "唐宁洁（1987-），女，河南新乡人，西安电子科技大学硕士生，主要研究方向为认知无线电中的信号处理。" ]
  [ "李钊（1981-），男，陕西西安人，博士，西安电子科技大学副教授、硕士生导师，主要研究方向为MIMO无线通信和认知无线电。" ]
- 基金信息：
  
  国家自然科学基金资助项目;The National Natural Science Foundation of China(60772138);国家自然科学基金资助项目;The National Natural Science Foundation of China(61102057);国家高技术研究发展计划（“863”计划）基金资助项目;The National High Technology Research and Development Program of China(2007AA01Z288);国家重点基础研究发展计划（“973”计划）基金资助项目(2009CB320404);教育部科学技术研究重点基金资助项目;Key Project of Chinese Ministry of Education(107103);国家科技重大专项基金资助项目;The National Science and Technology Major Specific Project of China(2009ZX03007-004);高等学校学科创新引智计划基金资助项目;The 111 Project(B08038)
- DOI：1000-436X(2011)11-0078-07
  中图分类号： TN911.7
- 网络首发：2011-11，
  
  纸质出版：2011-11-25
- 稿件说明：
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刘明骞, 李兵兵, 唐宁洁, 等. 认知无线电中OFDM信号信噪比盲估计[J]. 通信学报, 2011,32(11):78-84.

Ming-qian LIU, Bing-bing LI, Ning-jie TANG, et al. Blind SNR estimation for OFDM signals in cognitive radio[J]. Journal on Communications, 2011, 32(11): 78-84.
刘明骞, 李兵兵, 唐宁洁, 等. 认知无线电中OFDM信号信噪比盲估计[J]. 通信学报, 2011,32(11):78-84. DOI： 1000-436X(2011)11-0078-07.

Ming-qian LIU, Bing-bing LI, Ning-jie TANG, et al. Blind SNR estimation for OFDM signals in cognitive radio[J]. Journal on Communications, 2011, 32(11): 78-84. DOI： 1000-436X(2011)11-0078-07.

摘要

针对认知正交频分复用(OFDM

orthogonal frequency division multiplexing)系统中低信噪比多径信道下传统的OFDM信号信噪比盲估计算法的估计性能差，计算复杂度高的问题，提出一种新的OFDM信号信噪比盲估计方法，该方法首先利用自相关函数的特性粗略估计出信道阶数，确定循环前缀部分中不受符号间干扰的数据区间，然后根据选定区间的数据的自相关函数值估计接收信号的信号功率，最后利用循环前缀数据为部分有用数据的复制这一特性估计出噪声功率，从而估计出接收信号的信噪比。仿真实验结果表明，提出的方法无需任何先验信息，在低信噪比多径信道下具有良好的估计性能，且计算复杂度低，更适合于认知OFDM系统。

Abstract

The traditional blind SNR estimation algorithms had problems of poor performance and high computation complexity for OFDM systems in cognitive radio with low signal to noise ratio(SNR)and multi-path channel conditions

in view of which a novel blind SNR estimation method for orthogonal frequency division multiplexing(OFDM)signals was proposed.Firstly

the channel order was roughly estimated by utilizing the characteristics of autocorrelation function to determine the data interval which was free of inter-symbol interference(ISI).Secondly

the signal average power was estimated by computing the autocorrelation values of data in the determined interval.Finally

the noise average power was estimated by utilizing the characteristics that the data in cyclic prefix which was replication of part useful data.So the SNR of the received signals could be estimated.The simulation results show that the proposed method doesn’t need any prior information and has better performance and lower computation complexity

which is more suitable for OFDM systems in cognitive radio.

关键词

Keywords

references

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