超宽带发射参考系统中的多级并行检测  

Multiple-level parallel detection in ultra-wideband transmitted reference systems

作　　者：廖学文[1] 朱世华[1] 曾二林[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《电波科学学报》2007年第6期995-1001,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(60372055);博士点基金(20030698027)

摘　　要：针对超宽带技术中块发送结构下的发射参考技术,提出了一种新的多级并行检测算法。该方法利用少量参考帧与块内接收数据帧对理想接收波形进行多级联合估计,通过软判决逐级逼近理想接收波形,最大限度地利用了数据帧本身包含的脉冲接收波形信息,提高了误码性能。利用随机向量二次型的矩生成函数及其积分,推导了该检测算法在任意给定块结构时的性能下界。采用IEEE802.15.3a的室内多径信道模型仿真表明,与传统发射参考接收机和其他块发送结构下的检测方案相比,该检测算法具有更好的误码性能,并由仿真性能和分析下界得到了关于块结构和不同块长对性能影响的一系列结论。On the basis of ultra-wideband （UWB） block-structured transmitted reference （TR） technology, a new multiple-level parallel detection scheme was proposed in this paper. Resorting to the scheme, the ideal pulse received waveform was estimated with the joint use of the reference frames, data frames and the previous-level soft decision of the unknown data symbols. The received pulse waveform information contained in data frames is used to obtain the optimal correlation template, and the bit error rate performance is improved level by level. The performance lower bounds of the detection algorithm for arbitrary block structure are investigated via the moment generating function and its integration of the quadratic forms of random variables. Simulation results using the IEEE 802. 15. 3a indoor multipath channel models reveal that the new detection scheme outperforms the conventional TR technology and other block-structured TR detection schemes. Some more conclusions about the structure and the length of data blocks are derived from the simulation and lower bound analysis.

关 键 词：超宽带 发射参考 广义似然比检测 多级并行检测 矩生成函数 

分 类 号：TN914.3[电子电信—通信与信息系统]