A Hybrid MIMO System Combining Switch of Space-Time Modes and AMC with Turbo Code for Link Adaptation

摘要

The Multi-Input Multi-Output (MIMO) system employing multiple antennae at both transmitter and the receiver increases the throughput significantly. However, the throughput of MIMO system depends on spatial channel characteristics. For maximizing the system throughput under a certain channel condition, only real-time switching the size of constellations and space-time modes between transmit diversity and spatial multiplexing schemes according to spatial channel will bring the throughput break at the switch point because the quality of service must be satisfied. In order to mitigate the throughput loss and improve the spectral efficiency of system dramatically, we propose and analyze a hybrid MIMO system, which combines adaptive Turbo coding rate, adaptive modulation (AM) and adaptive switch of space-time modes. Meantime, a simple and feasible switch criterion is used. Simulation results show this method of link adaptation (LA) can maximize the throughput of MIMO system.