An Adaptive CQI Feedback Algorithm Based on SINR

Abstract

In order to increase the stability and accuracy of Channel Quality Indication (CQI) feedback and improve the performance of the system and the transmission rate of user equipment (UE) without increasing system bandwidth in LTE-Advanced system, this paper proposes an improved adaptive CQI feedback algorithm. In this algorithm, the initial value of CQI is estimated by using the smoothing value of the signal and interference plus noise ratio (SINR), and then the value of CQI feedback is corrected by the error block rate (BLER). Finally, the algorithm is simulated so as to verify the feasibility and effectiveness of this algorithm by using MATLAB in the channel environment such as EPA5 and EVA5, and it is showed in simulation results that this algorithm can achieve good performance gain.