Channel Quality Indicator Feedback in Long Term Evolution (LTE) System
نویسنده
چکیده
LTE is a 3GPP evolution of UMTS that is envisaged to provide high data rate and low latency in order to satisfy the data rate requirement of current high data rate applications. To achieve this and guaranty transmission at all times, LTE system adjust transmission parameters like PMI, RI and CQI dynamically. Accomplished via feedback from UE, the feedbacks are set after every transmission time interval based on the measured link quality as adjudged by post detection SINR at the receiver. This paper examined CIQ feedback in LTE using Vienna LTE Link Level Simulator for ITU-T Pedestrian A and Vehicular A channels for different receiver and channel knowledge. It was seen that CQI feedback brings performance improvement for the different scenarios studied. In all, Pedestrian A channel showed better performance compared to Vehicular A channel.
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