Layered Space-Time Codes Over Ricean Fading Channels by Reducing the Correlation of Spatial Shaping Pulses

In this paper, an asynchronous layered space-time architecture is proposed to realize the spatial multiplexing over the Ricean Multiple-Input Multiple-Output (MIMO) channels. Based on reducing the correlation of spatial shaping pulses between the multiplexed streams, this approach can be used to solve the problem of detection in the ill-conditioned channel matrix. It is shown that at the receiver, the reduction of the correlation enables the requirement on the number of the receive antennas to be removed by the Zero Forcing (ZF) detector compared with the conventional synchronous layered space-time architecture.