Performance of DSTM MIMO Systems Based on Weyl Group in Time Selective Channel

Traditionally, the channel used for differential multiple-input-multiple-output (MIMO) systems is constant during one frame and changes randomly from one frame to another. This channel behavior is too simple to be realistic. In this paper, we propose a new time selective channel model for differential space-time modulation (DSTM) schemes. A sufficient number of Rayleigh channel matrices are randomly generated, and the other channel matrices are sinc interpolated according to the Nyquist's sampling theorem. The performance of DSTM schemes with two, four and eight transmit antennas are evaluated over this time selective channel model. Simulation results show slightly degraded but more realistic performance when this new channel model is used.