Abstract: Per-antenna rate control (PARC) is an efficient way to increase throughput of multi-stream multipleinput multiple-output (MIMO) systems. In time-varying channels, however, the channel quality indicator (CQI) fed back to the transmitter becomes is outdated. There is a mismatch between the selected transmission scheme and actual situation. Therefore, the system performance may be degraded. We propose an improved transceiver structure for PARC based multi-stream MIMO system considering the channel delay effects of CQI feedback. The minimum mean square error (MMSE) channel predictor based on pilot symbol assisted modulation (PSAM) for MIMO systems is used for prediction. This scheme compensates for the performance degradation caused by transmission delay and offers a more precise application of the modulation and coding set (MCS) selection scheme for modulation and rate control. Simulations are performed to demonstrate the performance for the proposed system.

Key words:  MIMO, channel prediction, CQI, MCS, PARC