Partial Channel Quality Indication Feedback for OFDMA-Based Systems

The challenge of our work is to enhance the effec- tiveness of Channel Quality Indicator (CQI)reporting schemes in multi-user OFDMA-based communication systems. Based on information theory, we propose a novel CQI reporting scheme that exploits instantaneous mutual information at the User Equipment (UE) in order to choose the best Physical Resource Blocks (PRBs) / CQI pairs to be fed back. While predicting the channel outage instances, the CQI feedback signalling is improved and is still compatible with any classical reporting schemes. As can be seen in our simulation results, the proposed CQI reporting scheme can significantly enhance the overall cell capacity, UE throughput, packet latency and Packet Error Rate PER) while reducing multi-user scheduling complexity at the Base Station (BS).