OFDM信号循环谱结构分析

黄奇珊; 彭启琮; 路友荣; 韩猛

doi:10.3724/SP.J.1146.2006.00721

OFDM信号循环谱结构分析

doi: 10.3724/SP.J.1146.2006.00721

黄奇珊^{①②;彭启琮},
彭启琮,
路友荣,
韩猛

基金项目:

国家自然科学基金重大项目(60496313)资助课题

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出版历程
- 收稿日期: 2006-05-29
- 修回日期: 2006-11-06
- 刊出日期: 2008-01-19

Cyclic Spectrum Analysis of OFDM Signals

摘要

摘要: 利用数字调制信号的循环平稳特性可以完成许多盲信号处理任务，但前提是必须清楚信号的循环谱结构。该文把数字调制信号建模成线性周期时变变换，结合非周期的齐次马尔可夫链模型，推导和计算OFDM信号的循环谱公式，并通过计算机仿真给出了双频面上的OFDM循环谱幅度，结果与理论分析相吻合。
- 循环谱; 盲信号处理; 正交频分复用
Abstract: Based on cyclostationarity of digital modulated signals, many blind signal processing applications can be completed. But the cyclic spectrum structure of signals must be known in premise. Based on Linear Periodically Time-Variant transformation (LPTV) model and aperiodic homogeneous Markov chain model, the Spectral Correlation Density (SCD) expression of OFDM signals is derived. The magnitudes of cyclic spectrum are graphed as the heights of surfaces above a bifrequency plane. Computer simulation results confirm theoretical analysis.

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