Efficient Wireless Channel Quality Feedback Schemes Using Optimization Techniques

In this paper we propose different channel quality indication (CQI) feedback schemes for orthogonal frequency division multiple access (OFDMA) based future wireless broad-band systems. CQI information considered is the signal to noise ratio (SNR) values of the individual frequency subbands. The feedback schemes are based on linear regression methods that fit a quadratic polynomial to the SNR feedback values in an efficient manner. The Best-M feedback reporting method and the Max SNR scheduler are employed in the system used to evaluate the performance of the schemes. The simulations show that considerable gain in uplink throughput is obtained due to the less feedback bits requirement of the proposed schemes, especially for the future broadband networks that are designed to support a large number of users.