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Open Access Research

Resource allocation for clustered network MIMO OFDMA systems

Jingya Li1*, Carmen Botella2 and Tommy Svensson1

Author Affiliations

1 Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden

2 Institute of Robotics and Information & Communication Technologies (IRTIC), Universitat de València, València, Spain

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EURASIP Journal on Wireless Communications and Networking 2012, 2012:175  doi:10.1186/1687-1499-2012-175

Published: 18 May 2012

Abstract

In this article, we address the resource allocation problem for the downlink of a large network multiple input multiple output orthogonal frequency division multiplexing system with 3-sector base stations. The system is statically divided into a number of disjoint clusters of sectors. A two-step resource allocation scheme is proposed involving the inter-cluster and the intra-cluster levels. As a first step or inter-cluster level, two cooperative frequency reuse approaches are designed to mitigate the inter-cluster interference. A user partition method is proposed to divide the users of each cluster into cluster-edge and cluster-center users. To balance the cell-edge and the cell-average performance, a fairness jug function is introduced to determine the frequency partition of the cooperative frequency reuse approaches. Then, as a second step or intra-cluster level, a utility-based joint scheduling and power allocation algorithm is proposed for each cluster, to maximize the sum utility of all users in the cluster under per-sector power constraints. Zero-forcing joint transmission is used across multiple sectors within the same cluster. Simulation results show that the proposed scheme can efficiently reduce the inter-cluster interference and provide considerable performance improvement in terms of both the cell-edge and cell-average user data rate. The proposed two-step resource allocation scheme can be implemented independently in each cluster without inter-cluster information exchange, which is an attractive property for practical systems, since it reduces both the network signaling overhead and the computational complexity.

Keywords:
OFDMA; network MIMO; frequency reuse; resource allocation; interference coordination