Transmit optimization for MIMO channels with mixed delay-constrained and no-delay-constrained services

The paper studies the transmit optimization problem for MIMO channels with mixed delay-constrained (DC) and no-delay-constrained (NDC) services. Suppose that perfect channel state information is available to both transmitter and receiver sides, we propose a transmission scheme based on a sub-channel grouping (SCG) technique together with different power control policies designed for the grouped channels generated by SCG to support either DC or NDC services. Optimal and sub-optimal power allocation strategies are proposed. Computer simulations are given to evaluate the capacity achieved by the proposed scheme as well as to evaluate the throughput performance when practical bit-loading algorithms are applied.