A novel adaptive MIMO precoding scheme for VBLAST systems

We develop a new adaptive space-time signaling scheme by using the optimal precoder and constellation rotation. Our approach sufficiently utilized both the channel state information (CSI) and the constellation of the information streams to optimize the overall system. We also find that some precoders can be greatly enhanced by the constellation rotation, while others achieve nearly no improvement. We give an explanation to this phenomenon and therefore develop some criteria to design the combination of them. Numerical simulations are presented and verify our results.