A novel transmit optimization scheme for MIMO spatial multiplexing systems

In this paper, we propose a new kind of adaptive MIMO signaling scheme. Compared with other adaptive scheme, our approach utilize both the channel state information (CSI) and the constellation of the information streams. We also find that some precoders can be greatly enhanced by the constellation rotation, while others achieve nearly no improvement. We analyze this phenomenon and therefore develop some criteria to generalize the combination of them. Numerical simulations are presented and verify our results.