Comparison of User Selection Methods for Multiuser MIMO-OFDM Downlink with Limited Feedback

摘要

In this study, we have proposed a net throughput as performance measure that maximizing limited feedback scheme for multiuser MIMO-OFDM downlink based on per time-frequency cluster user selection, in which system parameters determine the number of data streams to be assigned to one user to receive these streams through eigenmode transmission, while the remaining data streams are assigned to other users with Zero-Forcing (ZF) Receiver (Rx) processors and then compared its average net throughput with a number of Limited Feedback (LF) MIMO-OFDM downlink schemes. We obtain the net throughput maximizing cluster size for scheme I using analytical and a semi-analytical derivations approach. We compared two schemes using average net throughput and average sum rate: scheme I per-cluster user selection and scheme II ZF receiver processing with per-antenna user selection, both are Spatial Multiplexing (SM) MIMO-OFDM downlink transmission schemes based on limited feedback. The results showed scheme I has a greater average net throughput while, scheme II achieves a higher average sum rate over scheme I.