A Cross-Layer Design Based on Precoding and Partial Feedback for Multiuser MIMO-OFDM Systems

A cross-layer design based on precoding and partial feedback for multiuser MIMO-OFDM systems is presented in this paper. First, we design precoder vectors with partial feedback in order to convert the MIMO channels into equivalent single-input single-output (SISO) channels. Then we can divide the radio resource into many space-time-frequency (STF) three dimension resource units. Then we present a novel cross-layer design that combines packet scheduling and resource allocation. The two parts function tightly together make use of the feedback channel state information (CSI) and packets characteristic such as packet arrival, delay constraint, packet size and users´ contentment and so on. Simulation results show that our scheme can satisfy most users´ QoS requirements and have very good performance in packet drop rate, packet delay and system throughput while reduces feedback greatly.