Improvement of CQI feedback schemes based on OFDMA system

Abstract

In this paper, a new feedback scheme is presented based on the comparison of several CQI feedback schemes for OFDMA systems. The number of feedback level is decreased. And the number of feedback RBs (Resource Blocks) is increased in each level, in order to enrich the feedback information of the radio channel. Simulation results show that the new scheme enhances the description precision of the radio channel and is quite flexibile when used under different channel conditions, with hardly no more bit cost compared to some current schemes.