摘要
在非相干超宽带（Ultra-wideband,UWB）通信系统中,加权接收机一般用于抑制噪声或干扰。它将接收信号的自相关或能量积分区间分割成多个子区间,再把各子区间上的积分输出加权组合,通过优化加权系数来抑制噪声或干扰。为了提高优化效果,针对传输参考（Transmitted Reference,TR）UWB通信系统,提出了一种新的数字式加权自相关接收机。首先采用统计平均方法估计出信道特征向量,利用该特征向量将自相关序列重新排列后分段求和（积分）并输入自适应滤波器进行优化训练;最后利用优化后的加权系数向量进行自适应迭代检测。相比现有接收机,该方法在误码性能方面具有明显优势。
Weighted detection receivers are usually used to suppress noise or interference to obtain better detection performance for noncoherent ultra-wideband communication systems. In a weighted detection receiver,the integration interval of auto-correlated integral or energy integral of the received signal is divided into multiple sub-intervals or integration bins,and the corresponding integration outputs over these sub-intervals are linearly combined by using the weighting coefficients optimized to suppress noise or interference.To improve the optimization effect,this paper proposes a new digital weighted autocorrelation receiver,in which the sampled auto-correlated signal is first rearranged following a channel characteristic vector（ estimated by statistical averaging） that characterizes the monotonic energy distribution of multipath fading components,and then the rearranged sequence is divided into multiple partitions. The corresponding summation/integration outputs over these partitions are input to an adaptive filter to optimize the weighting coefficients by training based on the minimum mean square error（ MMSE） criterion. Finally,adaptive iterative detection is dynamically performed via the optimized weighting coefficients.Theoretical analysis and simulation results show that compared to the digital versions of existing weighted autocorrelation receivers,the proposed digital scheme can achieve significantly better bit error rate（ BER） performance with limited penalty in terms of implementation complexity.
作者
梁中华
LIANG Zhonghua(School of Information Engineering,Chang＇ an University,Xi＇ an 710064,China)
出处
《激光杂志》
北大核心
2018年第8期88-92,共5页
Laser Journal
基金
国家自然科学基金(No.61271262)
关键词
自相关接收机
传输参考
超宽带
加权优化
误码率
autocorrelation receiver （ AcR ）
transmitted reference （ TR ）
ultra - wideband （ UWB ）
weight optimization
bit error rate （BER）
