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| OFDM信号循环谱分析及参数估计* | |
| 引用本文： | 蒋清平,杨士中,张天骐. OFDM信号循环谱分析及参数估计*[J]. 计算机应用研究, 2010, 27(3): 1133-1135. DOI: 10.3969/j.issn.1001-3695.2010.03.090 |
| 作者姓名： | 蒋清平 杨士中 张天骐 |
| 作者单位： | 1. 重庆大学,通信学院,重庆,400030;重庆邮电大学,通信学院,重庆,400065 2. 重庆大学,通信学院,重庆,400030 3. 重庆邮电大学,通信学院,重庆,400065 |
| 基金项目： | 国家自然科学—中物院NSAF联合基金资助项目（10776040）；重庆邮电大学移动通信技术重点实验室开放研究基金资助项目 |
| 摘 要： | 针对在无线电监测和认知无线电系统中，信号参数估计这一重要问题，证明了OFDM信号具有循环平稳性的必要条件是加循环前缀或有非矩形脉冲成型，并以线性周期时变变换(LPTV)模型为基础，推导了OFDM信号的循环谱表达式。通过对连续信号和离散信号进行计算机仿真，都得到了相同的OFDM信号循环谱图，实现了OFDM信号符号周期的估计，结果与理论分析相吻合。 |
| 关 键 词： | 循环谱；认知无线电；盲信号处理；正交频分复用 |
Cyclic spectrum analysis and parameters estimation of OFDM signals |
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| JIANG Qing-ping,YANG Shi-zhong,ZHANG Tian-qi. Cyclic spectrum analysis and parameters estimation of OFDM signals[J]. Application Research of Computers, 2010, 27(3): 1133-1135. DOI: 10.3969/j.issn.1001-3695.2010.03.090 | |
| Authors: | JIANG Qing-ping YANG Shi-zhong ZHANG Tian-qi |
| Affiliation: | 1.College of Communications Engineering/a>;Chongqing University/a>;Chongqing 400030/a>;China/a>;2.School of Communication & Information Engineering/a>;Chongqing University of Posts & Telecommunications/a>;Chongqing 400065/a>;China |
| Abstract: | To explore the signal parameters estimation in radio monitoring and cognitive radio systems, this paper demonstrated the cyclostationarity of the OFDM signals with cyclic prefix or non-rectangular pulse shape.Furthermore,obtained the cyclic spectrum expressions of OFDM signal based on the model of linear periodically time-variant transformation (LPTV).Computer simulation results of both the continuous signals and discrete signals are the same, and can estimate the symbol time of OFDM signals, results exactly match with the theoretical analysis. |
| Keywords: | cyclic spectrum cognitive radio blind signal processing OFDM(orthogonal frequency division multiplexing) |
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