单比特取样超宽带系统的时延估计误差分析  

The Estimation of Time Delay for Monobit IR-UWB Signals

作　　者：管伟[1] 龚卫林[1] 卫国[1] 

机构地区：[1]中国科学技术大学无线网络通信实验室,合肥230027

出　　处：《无线通信技术》2010年第3期9-13,18,共6页Wireless Communication Technology

摘　　要：本文研究在单比特量化取样条件下超宽带系统的时延估计问题。分别在加性高斯白噪声和多径衰落两种信道模型下,对单比特取样超宽带系统的时延估计误差进行了分析。利用线性近似的分析方法,分别给出了两种信道下单比特取样接收时延估计的Cramer-Rao界,并对此进行了分析。在加性高斯白噪声信道中,Cramer-Rao界与信噪比成反比;在多径衰落信道中,Cramer-Rao界随着路径数增多而增大。In this paper, we study the Cramer - Rao Lower Bounds for the Time Delay Estimation of monobit UWB communication system. The analysis is based on AWGN and Multipath Fading Channels respectively. By the method of linearization, we obtain and analyze the Cramer- Rao Lower Bounds of monobit IR - UWB system in two chnnels. In AWGN channel the Cramer - Rao Lower Bound is inversely proportional to SNR while In Multipath Fading Channel the Cramer - Rao Lower Bound increases when the number of path increases.

关 键 词：超宽带通信 同步 CRAMER-RAO界 

分 类 号：TN92[电子电信—通信与信息系统]