摘要
针对两路同频OFDM信号混合的符号速率估计问题,提出了一种基于循环谱特性的符号速率估计算法。该算法比较混叠前和混叠后OFDM信号在循环谱特性上存在的差异,并利用该差异识别OFDM信号是否存在混叠现象,同时提取符号速率的相关信息,实现单通道混叠信号的速率估计。该算法不需要任何先验信息,可以直接在中频实现。仿真结果表明该算法的有效性,且对噪声不敏感。
In this paper, a symbol rate estimation algorithm based on cyclic spectrum is proposed for singlechannel two co-channel mixed 0FDM signals, which analyzes the character of cyclic spectrum of a single OFDM signal and the mixed OFDM signal respectively. The receiver can identify the mixed OFDM signal and simultaneously estimate the symbol rates of two co-channel 0FDM signals from the difference of cyclic spectrum. The main feature of the proposed approach is needless to know any prior information of the mixed signals, which can be applied to intermediate frequency signal. Simulation results demonstrate good availability of the proposed method, and verify that it is not sensitive to the noise.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2015年第6期818-823,共6页
Journal of University of Electronic Science and Technology of China
基金
国家863项目(2014AA01A707)
关键词
循环谱
混叠信号
OFDM
单通道
cyclic spectrum
mixed signal
OFDM
single-channel
