MIMO-MB-OFDM UWB通信系统中空时频编码技术研究

针对MB—OFDM UWB系统的性能特征，基于理论分析系统的成对错误概率，获知编码增益和分集增益的计算公式，从而得到空时频编码方案的设计准则．在此基础上，提出一种简化结构的空时频编码方案，并分析基于空时频编码的系统传输性能，为提高MB—OFDM UWB系统的性能给出了一个可行的方法．仿真结果表明，相比于传统的未编码的SISO—MB—OFDM UWB系统，该方案具有良好的系统误码率性能．而与8阶正交空时频编码方案相比，该编码方案结构简单，编解码复杂度比较低．

Research of Space-time-frequency Codes in MIMO-MB-OFDM UWB Communications

Recently, the application of multi input multi output technology in uhra-wideband system is considered as a hot research topic. The channel coding technology is one of the principal technologies. Aiming at the performance characteristics of MB-OFDM UWB, the formula for coding gain and diversity gain is worked out based on pairwise error probability of theoretical analyzing system. Thus, a design principle of space-time-frequency codes is laid down which helps to propose a simplified method of this kind. This paper also examines the transmission performance of the space-time-frequency code system, which provides a feasible method for improving the performance of the MB-OFDM UWB system. Compared with the the traditonal uncoded SISO-MB-OFDM UWB system, the error code rate of this method is much lower. Moreover, this coding method is simpler and the codes are less complicated compared to the present order-8 space-time-frequency coding method.