多用户多径环境下超宽带系统误码性能分析  

Performance analysis of multipath and multiple-access fading in UWB

作　　者：沙学军[1] 林迪[1] 吴宣利[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,黑龙江哈尔滨150001

出　　处：《江苏大学学报（自然科学版）》2009年第2期174-177,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(60432040)

摘　　要：为分析多径环境下脉冲超宽带跳时多址系统的性能,通过研究IEEE 802.15.3a工作组给出的多径信道参考模型,提出一个同时存在多用户干扰、多径干扰以及加性高斯白噪声情况下的超宽带系统相干解调的误码性能分析模型.针对超宽带信道环境中多径分量的泊松到达过程,采用概率理论对系统中的干扰进行分析,分别计算得到多用户干扰和多径干扰的方差,进而提出精确的系统误码率计算公式.为验证公式的有效性,在不同信道环境下将所提公式计算结果同计算机仿真以及高斯近似方法计算得到的结果进行对比,结果表明所提公式能够更好地逼近计算机仿真,从而为系统误码性能的评估及超宽带系统的设计提供依据.To analyze the time-hopping（TH） impulse radio ultra wideband（UWB） transmission performance in the presence of multipath environment,a model for bit error rate（BER） analysis of UWB systems with coherent demodulation in the presence of multipath interference,multiple access interference and additive Gaussian white noise was proposed by analyzing the statistics of mulitpath channel models defined by the IEEE 802.15.3a Task Group.By exploiting the property of Poisson path arrivals,the exact BER formulation was derived utilizing the theory of probability.In order to verify this formulation,the calculated result was compared with those by computer simulation and by Caussian approximate approach in different channel models.The comparison results show that the method proposed matches computer simulations better than Caussian approximate approach and can readily be applied to the perfor-mance evaluation and system design of realistic channel models.

关 键 词：超宽带 多址干扰 多径干扰 概率理论 系统模型 

分 类 号：TN914.5[电子电信—通信与信息系统]