Abstract
The resource allocation problem for the downlink of orthogonal frequency division multiple access (OFDMA) wireless multicast systems is investigated. It is assumed that both the base station (BS) and a user are equipped with a single antenna, and the allocation unit is not the subcarrier, as in conventional OFDMA systems, but a set of contiguous subcarriers referred to as a chunk. The multicasting technology is able to support several groups of users with flexible quality of service requirements. A general mathematical formulation is provided, but achieving the optimal solution has a high computational cost. Thus, a heuristic but efficient algorithm is proposed in order to maximize the total throughput; the novelty of this algorithm is that it is subject to constraints on the total available power, the average bit error rate over a chunk, and proportional data rates among multicast groups. In addition, it considers different user classes with distinct QoS requirements. Simulation and complexity analysis are provided to support the benefits of chunk-based resource allocation to multicast OFDMA systems with tight QoS constraints for user classes.
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