摘要
为了补偿无线信道群时延特性所带来的影响,基于盲均衡器结构提出了一种优化的自适应均衡算法。该算法是基于最小均方误差准则的变步长LMS算法,通过自适应调节判决反馈均衡器两组横向滤波器的抽头系数,实现对信道群时延的自适应补偿。通过对16-QAM信号的仿真结果表明,新算法能够对有效补偿信道群时延带来的影响,并且明显降低系统的误码率。
Based on the structure of blind equalizer,a optimized adaptive equalizer algorithm is proposed to compensate the influence of group delay in wireless channel.Based on the principle of minimum mean square error,a modified variable step size LMS algorithm is adapted to adjust the coefficients of two filters in decision feedback equalizer.By the simulation of 16-QAM,the results show that the influence of group delay can be compensated by this new algorithm effectively,where the bit error rate is significantly reduced.
出处
《电视技术》
北大核心
2009年第S2期166-168,174,共4页
Video Engineering
基金
国家自然科学基金项目(60872030)
