Research Article
Distributed Multicast Resource Allocation in OFDM-based Cognitive Radio Networks
@INPROCEEDINGS{10.1109/ChinaCom.2013.6694565, author={Kewen Yang and Wenjun Xu and Shengyu Li and Jiaru Lin}, title={Distributed Multicast Resource Allocation in OFDM-based Cognitive Radio Networks}, proceedings={8th International Conference on Communications and Networking in China}, publisher={IEEE}, proceedings_a={CHINACOM}, year={2013}, month={11}, keywords={distributed resource allocation multiple description coding multicast cognitive radio networks geometric programming multi-cell orthogonal frequency division multiplexing}, doi={10.1109/ChinaCom.2013.6694565} }- Kewen Yang
Wenjun Xu
Shengyu Li
Jiaru Lin
Year: 2013
Distributed Multicast Resource Allocation in OFDM-based Cognitive Radio Networks
CHINACOM
IEEE
DOI: 10.1109/ChinaCom.2013.6694565
Abstract
In this paper, the resource allocation problem, which aims to maximize the weighted sum rate in orthogonal frequency division multiplexing based (OFDM-based) multi-cell cognitive radio networks (CRNs) with multiple description coding multicast (MDCM), is investigated. A two-phase distributed scheme including subcarrier assignment and power allocation is proposed. During subcarrier assignment phase, each cell determines the multicast group (MG) selection for each subcarrier and the set of scheduled cognitive radio users (CRUs) in the selected MG by a proposed heuristic scheme to maximize its weighted sum rate under uniform power distribution assumption. During power allocation, each cell allocates power on subcarriers by a proposed distributed geometric programming (GP) power allocation algorithm. Unlike the existing centralized solutions in the literature, it does not require global network information and each cognitive radio (CR) cell performs its own resource allocation through limited collaboration with other CR cells and primary networks (PNs). Numerical results demonstrate the validity of the proposed resource allocation scheme and the advantages of MDCM over conventional multicast (CM).