OFDM系统的抗窄带干扰性能分析  

Performance of OFDM System under Narrow-band Interference

作　　者：熊李娜[1] 李涛[1] 梅林[1] 沙学军[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,黑龙江哈尔滨150001

出　　处：《通信技术》2011年第10期25-26,29,共3页Communications Technology

基　　金：国家重点研究基础发展计划(973)项目(批准号:2007CB310606)

摘　　要：目前,2.4 GHz非授权频段越来越拥挤,使得工作在此频段下的WLAN系统很容易受到窄带干扰的影响。针对这种情况,主要研究窄带干扰环境下OFDM通信系统的性能。通过理论分析和仿真可以得到,在窄带干扰比较严重的环境下,OFDM通信系统性能急剧下降。当干扰信号的中心频点不是OFDM符号基本频率的整数倍时,这一点尤其明显。因此,在窄带干扰比较严重的场合,必须要采取一定的抗干扰措施来保证系统的正常工作。Nowadays,for the non-authorized frequency band of 2.4GHz is becoming busier and busier,the WLAN system under this frequency band would be affected easily by the narrow-band interference.Aiming at this condition;this paper focuses on the performance of OFDM system under the narrow-band interference.Theoretical analysis and simulation indicate that the performance of OFDM communication system would rapidly descend under the serious narrow-band interference,and this problem is particularly obvious when central frequency of the interference is not the integer times of the OFDM basic frequency.Therefore,some measures must be taken to guarantee normal work of the system under serious interference.

关 键 词：正交频分复用技术 窄带干扰 频谱泄漏 

分 类 号：TP802.6[自动化与计算机技术—检测技术与自动化装置]