摘要
针对低信噪比条件下利用过零检测进行小数据量信号符号速率估计性能较差的问题,提出一种基于判决反馈的估计方法。该方法利用已知符号速率集,首先对基带信号进行判决,并根据判决结果生成方波作为匹配模板,与原始基带信号进行相关匹配,若相关值高于门限值则判定当前符号速率为估计结果。仿真试验表明,基于判决反馈的符号速率估计方法信噪比性能优于传统过零检测方法 6 d B以上。
The application of zero-crossing detection in less symbol samples has poor performance in the condition of low SNR.Aiming at this problem,this paper proposed a method based on decision feedback.By using a known symbol rates set,the decision for received baseband signal is made,and then a square wave model for matching is generated based on the decision result.If the correlation between the model and the received baseband signal is higher than a threshold which is determined before,the corresponding symbol rate is identified as the true symbol rate.The simulation results show that the proposed method outperforms the zero-crossing detection over 6 d B in terms of SNR performance.
出处
《无线电通信技术》
2018年第2期165-169,共5页
Radio Communications Technology
基金
河北省博士后科学基金重点资助项目(B2016005006)
关键词
符号速率
过零检测
判决反馈
symbol rate
zero-crossing detection
decision feedback
