Abstract: In this paper, a new feedback scheme is presented based on comparison of several CQI feedback schemes using OFDMA(orthogonal frequency division multiple access). The number of feedback levels is decreased, while the number of feedback resource block(RB) is increased in each level in order to enrich the feedback information of radio channel. Simulation shows that the new scheme enhances description precision of radio channel and flexibility when it is used under different channel conditions without additional bit cost as compared to some current schemes.

Key words: feedback scheme
, orthogonal frequency division multiple access(OFDMA), CQI