Feedback Reduction for Multiuser OFDM Systems
Feedback reduction in multiuser Orthogonal Frequency Division Multiplexing (OFDM) systems becomes an important issue due to the excessive amount of feedback required to use opportunistic scheduling, especially when the number of users and carriers is large. In this paper, the authors propose a novel feedback reduction scheme for efficient downlink scheduling. In the proposed scheme, each user determines the amount of feedback based on the so called feedback efficiency in a distributed manner. The key idea is to give more feedback opportunity to users who are more often scheduled. Simulation results demonstrate that the proposed scheme can substantially decrease the feedback load while achieving almost the same scheduling performance as in the case of full feedback.