基于OFDM的认知无线电频谱检测算法研究

摘要

This paper introduced a novel spectrum detection scheme for OFDM-based system, which based on energy detection exploits CP unaffected by the effects of pollution of an OFDM symbol as well as idle period containing no information symbols.The simulation results show that the proposed algorithm has a good performance whether it is used in AWGN channels or frequency selective fading channels.%针对OFDM系统的特点,提出了一种新的频谱检测算法.该算法通过对OFDM收发双方的信号建模,以能量检测的方法为基础,充分利用了正交频分复用符号中的未受多径效应污染的循环前缀(CP)和空闲时间来提高检测的精度.计算机仿真结果表明,与传统的只利用空闲时间的能量检测方法和利用所有CP符号信息的方法相比,该算法更有效地提高了频谱检测的概率.