Adaptable channel decomposition for MIMO communications

Assuming the availability of the channel state information at the transmitter (CSIT) and receiver (CSIR), we consider the joint optimal transceiver design for multi-input multi-output (MIMO) communication systems. Using our recently developed generalized triangular decomposition (GTD), we propose a scheme, which we refer to as adaptable channel decomposition (ACD), to decompose a MIMO channel into multiple subchannels with prescribed capacities, or equivalently, signal-to-interference-and-noise ratios (SINR). We also determine the subchannel capacity region such that the channel decomposition is capacity lossless. This scheme is particularly relevant to the applications where independent data streams with different quality-of-services (QoS) share the same MIMO channel.