摘要
针对地面数字视频广播(DVB-T)系统中正交频分复用(OFDM)信号的盲检测问题,提出了一种基于差分处理结合相关运算的联合检测新算法。该算法利用了OFDM循环前缀的差分性质和相关特征,并对检测门限进行优化,最终达到了提高算法检测性能的目的。通过理论分析和计算机仿真结果表明,该算法能在较低的信噪比情况下正确地检测出信号,性能优于过去的算法。并且不需要很多先验信息,实用性好,还可为认知无线电领域的用户检测提供新方法途径。
Aiming at the blind detection problem of orthogonal frequency division multiplexing （OFDM） signal in digital video broadcasting-terrestrial （DVB-T） system,this paper puts forward a new joint detection algorithm based on differential processing combining with correlated operation. The algorithm uses the difference characteristic of OFDM cyclic prefix to optimize the detection threshold,which improves the performance of algorithm detection. The theoretical analysis and computer simulation result show：the proposed algorithm can be used for detecting signals correctly in the state of lower signal-to-noise ratio （SNR）, has performance better than traditional algo- rithms,and need not much prior information, has good practicability, moreover can provide a new path for user detection in cognitive radio domain.
出处
《舰船电子对抗》
2016年第4期77-81,共5页
Shipboard Electronic Countermeasure
关键词
DVB-T系统
OFDM信号
循环前缀
联合检测
DVB-T system
orthogonal frequency division multiplexing （OFDM） signal
cyclic pre- fix
joint detection
