基于MIMO系统的准正交空时分组码的容量分析

Analysis of Capacity of Quasi-Orthogonal Space-Time Block Codes for MIMO Systems

应用于MIMO系统的准正交空时分组码可以获得较大的容量,同时能够提供较低的误码率。文中比较了MIMO系统的准正交空时分组码的容量与SIMO系统的容量。结果显示,在低SNR和接收天线数少的情况下,应用于MIMO系统的准正交空时分组码会产生较大的容量增益,但随着SNR和天线数目的增加,容量增益越来越不明显。另外,文中比较了MIMO系统中准正交空时分组码和正交空时分组码的容量,仿真结果表明前者的容量明显高于后者。

QSTBC for MIMO systems can achieve larger capacity and lower symbol error rate. A comparison is made between the capacity of QSTBC for MIMO systems and that of SIMO system, which shows that in the low signal - to - noise ratio and the small number of receive antennas regime, QSTBC for MIMO systems yields larger capacity gain. As SNR and number of antennas increase, capacity gain becomes unapparent. The capacity of QSTBC is also compared with that of OSTBC for MIMO systems, and numerical simulations show that the capacity of QSTBC is significantly higher than that of OSTBC.