Improved transceiver structure based on PARC scheme for multi-stream MIMO systems
Per-antenna rate control (PARC) has been proved to be an efficient way to increase throughput of multi-stream MIMO systems. In time-varying channels, however, the channel quality indicator (CQI) fed back to the transmitter becomes outdated. That is, there is a mismatch between the selected transmission scheme and actual situation. Therefore, the system performance may decrease. In this paper, we proposed 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 decrease 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 this proposed system.