摘要
与直接序列扩频的方案相比,基于多频带OFDM的UWB系统能更有效地捕获多径能量。关于传统窄带OFDM信道估计的研究很多,但UWB系统与窄带系统的信道特性有很大不同。通过分析MB-OFDMUWB无线通信的体系结构、信号和信道模型,对UWB信道条件下采用前导训练序列和导频子载波的LS估计和MMSE估计的性能进行了研究和比较,并讨论了估计误差随SNR变化的特性,从而给出了适用于室内短距离UWB无线通信的信道估计方法。
The MB-OFDM UWB systems can capture multi-path energy more efficiently than DS-UWB. Much work has been done on the channel estimation of traditional narrow-band OFDM. However, there are many differences between the channel characteristic of narrow-band and UWB systems. After the analysis of architecture, signal and channel model of MB-OFDM UWB wireless systems, the performance of channel estimation approaches based on preamble training sequences and pilot sub-carriers according to the criterions of LS and MMSE respectively is investigated and compared, under different UWB channel conditions. The characteristic of estimation error changing with the SNR is also discussed. Consequently, the channel estimation techniques for indoor short-range UWB wireless communications are established.
出处
《科学技术与工程》
2006年第8期960-963,共4页
Science Technology and Engineering
基金
上海市重点学科建设项目(T0102)资助
关键词
无线通信
超宽带
正交频分复用
信道估计
wireless communications ultra-wideband orthogonal frequency-division multiplexing channel estimation
