1bit脉冲超宽带接收机采样抖动性能分析方法  

Novel method for analyzing the performance of the 1 bit IR-UWB receiver in the presence of timing jitter

作　　者：张超[1] 岳光荣[2] 尹华锐[3] 

机构地区：[1]西安交通大学电信学院,陕西西安710049 [2]电子科技大学通信抗干扰技术国家重点实验室,四川成都611731 [3]中国科学技术大学电子工程与信息科学系,安徽合肥230027

出　　处：《西安电子科技大学学报》2014年第1期140-146,共7页Journal of Xidian University

基　　金：国家自然科学基金资助项目(61102082;60802008);教育部博士点基金资助项目(20110201120011)

摘　　要：为了准确评估1bit脉冲超宽带接收机存在采样抖动时的性能,提出了一种基于中心极限定理的性能分析方法.首先将存在抖动的采样信号通过一阶泰勒展开为无抖动采样信号和采样抖动变量的线性函数,然后利用中心极限定理将接收机的判决变量建模为一个高斯分布的随机变量,从而得出接收机误码率表达式,最后根据采样抖动的随机分布模型,给出平均误码率上界表达式.该分析方法首次给出存在采样抖动时1bit数字接收机性能的解析表达式,并且可用于其他线性干扰存在情况下的性能评估.实验结果表明,给出的平均误码率上界可以很好地反映接收机的实际性能,并且可用于高斯分布和平均分布两种随机采样抖动模型.A novel method based on the Central Limit Theorem （CLT） is proposed to analyze the performance of the 1 bit Impulse-Radio Ultra-WideBand （IR-UWB） receiver in the presence of a timing jitter. First, the sampled signal with timing jitter is expressed as a linear function of the sampled signal without jitter and timing jitter through first-order Taylor series expansion. Then by the CLT, the decision variable of the 1 bit receiver is considered as Gaussian distributed and the bit error rate （BER） is derived. After that, an upper bound of the averaged BER is also provided based on the distribution o[ random timing jitter. The given analytical result is the first analytic expression of the BER performance of the 1 bit receiver with timing jitter and can be used for the case where the 1 bit receiver has a linear interference. Experimental results show that the proposed upper bound agrees with the actual performance of the 1 bit receiver very well and can be used for both Gaussian distributed and uniform distributed timing jitter.

关 键 词：脉冲超宽带 采样抖动 数字接收机 中心极限定理 

分 类 号：TN914.42[电子电信—通信与信息系统]