Abstract

To reduce the feedback load of OFDM-based wireless multicast systems, an opportunistic feedback scheme (OFS) is proposed. OFS aims to only feed the key channel gains that can significantly affect the system throughput back to the base station (BS). By mathematical derivation, the key channel gains are proved to belong to a channel gain interval, which can be estimated by a proposed statistical method. Simulation results show that OFS can significantly reduce the feedback load of OFDM-based multicast system, while remaining 99% multicast throughput performance compared with the full feedback scheme. Besides, the channel fading type of the BS-user link is not required, which would be more realistic.

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