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引用次数: 0
摘要
信道估计是无线超宽带通信系统中必须解决的关键技术之一。本文针对直接序列UWB系统与跳时系统的差异，在分析了体系结构、信号和IEEE 802.15.3a信道模型以及最大似然信道估计性能的基础上，研究了附加字符数。接收端采用MRC (most ratio combined, MRC) Rake接收机，通过分析信道产生的时延和损耗，仿真结果表明，超宽带无线电在低信噪比下具有良好的性能。直接序列超宽带方案优于二进制跳时脉幅调制方案。
The Performance Analysis of Channel Estimation on Wireless Ultra-Wideband Communication Systems
Channel estimation is one of the key technologies in the wireless ultra wideband communication systems which must be solved. In this paper, aiming at the difference of Direct-Sequence UWB system and Time- Hopping system, after the analysis of architecture, signal and IEEE 802.15.3a channel model , and the performance of maximum likelihood channel estimation, research additional character number .At the receiving end adopting most ratio combined (MRC) Rake receiver, by analyzing the Delay and the Loss which generated by channels, the simulation results show that ultra wideband radio is of good performance in low SNR, direct sequence ultra wideband scheme are better than that of binary time- hopping pulse-amplitude-modulation scheme.
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