A Resource Allocation Scheme for OFDMA-SDMA Downlink

doi:10.13190/jbupt.200706.116.songxh

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2007, Vol. 30 ›› Issue (6): 116-120.doi: 10.13190/jbupt.200706.116.songxh

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A Resource Allocation Scheme for OFDMA-SDMA Downlink

SONG Xing-hua, HE Zhi-qiang, NIU Kai, WU Wei-ling

(School of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China)

Received:2007-03-25 Revised:2007-05-22 Online:2007-12-31 Published:2007-12-31
Contact: Song Xing-Hua

Abstract

Abstract:

The resource allocation problem for the downlink of orthogonal frequency division multiple access-spatial division multiple access (OFDMA-SDMA) systems is studied. A simple and efficient algorithm is proposed, it jointly takes the constraints posed by the physical layer (in terms of bit error rate (BER) performance and spatial orthogonality) and the constraints posed by the media access control layer (in terms of quality of service requirements and user fairness). The resource allocation is divided into two steps: user selection and power allocation. Simulations show that the proposal enjoys a low implementation complexity. It improves the spectral efficiency significantly while maintaining quality of service (QoS) guarantees and certain fairness.

Key words: beamforming, cross-layer design, spatial division multiple access, spatial orthogonality

CLC Number:

TN911.22

SONG Xing-hua, HE Zhi-qiang, NIU Kai, WU Wei-ling

. A Resource Allocation Scheme for OFDMA-SDMA Downlink[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2007, 30(6): 116-120.

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A Resource Allocation Scheme for OFDMA-SDMA Downlink

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