摘要
针对传统正交频分复用系统对部分频带干扰敏感的问题,提出了一种结合线性星座预编码的部分频带干扰抑制方法.该方法通过估计受到强干扰影响的子载波位置并将该类子载波接收信号置零来构造不含强干扰分量的判决统计量.利用线性星座预编码优异的分集特性,将该统计量用于检测可恢复发送数据且消除强干扰的影响.相对于已有的编码正交频分复用及载波干涉正交频分复用两种干扰抑制方案,该方法对部分频带干扰有更好的鲁棒性,在强干扰下没有误码率底限.仿真结果表明,当信干比为-10 dB时,该方法的误码率随信噪比增加迅速减小,在信噪比达到20dB时误码率可降至10-3.
Aiming at the drawback of sensitivity to partial-band jamming in conventional orthogonal frequency division multiplexing systems, a partial-band jamming rejection method combined with linear constellation precoding was proposed. A new decision statistic excluding high-power interference was build through setting the signals from the severely jammed sub-carriers to zeros after estimating the indices of these sub-carriers. Then the new decision statistic was adopted to recover the transmitted data thanks to the remarkable diversity of linear constellation precoding. The effect of the strong jamming was also eliminated. Compared to the existing anti-jamming schemes, coded orthogonal frequency division multiplexing and carrier interferometry orthogonal frequency division multiplexing, the proposed method demonstrated better robustness to partial- band jamming and the floor of bit error rate under strong jamming was removed. Simulation results showed that, the bit error rate curve of the proposed method has a waterfall shape when sig-nal-interference-ratio is -10 dB. The bit error rate could achieve l0-s while signal-noise-ratio is 20dB.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2007年第10期1188-1192,共5页
Journal of Xi'an Jiaotong University
基金
国家高技术研究发展计划资助项目(2006AA01Z262)
国家自然科学基金资助项目(60372055)
教育部高等学校博士学科点专项科研基金资助项目(20030698027)
关键词
正交频分复用
线性星座预编码
部分频带干扰
orthogonal frequency division multiplexing
linear constellation precoding
partial-band jamming
