分布式STBC在UWB系统中的应用及其性能分析

The Application and Performance Analysis of Distributed STBC in UWB

基于STBC(space-tim e b lock cod ing)可以实现发射天线数确定的完全发射分集,并且仅仅对接收信号进行线性处理的非常简单的最大似然译码算法特点,文中将分布式STBC技术应用到UWB(u ltra w ideband)系统中,构建一个分布式STBC-UWB系统,以此来获得更好的系统性能。考虑只有单个中继节点的情况下,推导出该系统的误比特率表达式。在S-V信道模型环境下,利用MATLAB仿真了分布式STBC-UWB系统误码率性能,并与传统UWB系统进行比较,发现采用分布式STBC-UWB系统比传统系统在误码率性能上明显提高。

The space-time block codes can achieve the full transmit diversity specified by the number of the transmit antennas, while allowing a very simple maximum-likelihood decoding algorithm, based only on linear processing of the received signals. In this work, We design a distributed STBC-UWB system by applying the distributed STBC scheme to the UWB system, based on the simple and good characters of STBC, which can improve the system performance. Considering a special case of single relay, we derive a closed-form expression of the bit error rate （BER） based on perturbation theory. Under the S-V channel model environments, we simulate the BER performance of the distributed STBC-UWB systems using MATLAB, and then compare this model with the normal UWB systems. It is found that the performance of the distributed STBC-UWB system is evidently better than the normal system.