A distributed multiple description coding multicast resource allocation scheme in OFDM-based cognitive radio networks

Abstract

In this paper, we introduce multiple description coding multicast (MDCM) into orthogonal frequency division multiplexing based (OFDM-based) multi-cell cognitive radio networks (CRNs) and investigate the resource allocation problem aiming to maximize the weighted sum rate (WSR). An efficient distributed scheme including subcarrier assignment and power allocation is proposed. During subcarrier assignment, each cell heuristically selects the multicast group (MG) and the associated set of scheduled cognitive radio users (CRUs) for each subcarrier. During power allocation, each cell allocates power to subcarriers by a proposed iterative scheme considering pricing to enhance the efficiency of selfish iteration. The distributed scheme does not require global network information and each cognitive radio (CR) cell performs its own resource allocation through limited interaction with other CR cells. The effectiveness of the proposed scheme is illustrated by extensive simulation results.