Angle-of-departure-aided opportunistic space-division multiple access for MIMO applications

• Published in: IEEE transactions on wireless communications Vol. 9; no. 4; pp. 1303 - 1307
• Main Authors: Dahman, Ghassan, Hafez, Roshdy H M, Bultitude, Robert J C
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2010; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Angle-of-departure (AOD) estimation; Applied sciences; Array signal processing; beam-forming; Beams (structural); Broadcasting; Channel state information; Channels; Design engineering; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Feedback; Gain; Information, signal and communications theory; MIMO; Multiaccess communication; Multiple access; Signal and communications theory; Signal design; Signal representation. Spectral analysis; Signal, noise; space-division multiple access (SDMA); Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Throughput; Transmission and modulation (techniques and equipments); Transmitters; Wireless communication; MIMO system; Automatic classification; Parameter estimation; Wireless telecommunication; Signal classification; Beam forming; Space division multiple access; Angle of emergence; Channel estimation; Telecommunication channels; Broadcasting; space-division multiple access (SDMA); Angle-of-departure (AOD) estimation; beamforming
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2010.04.091074

This paper introduces a novel transmission technique for MIMO broadcasting directional channels, herein called the Angle-of-Departure-Aided Opportunistic Space-Division Multiple Access (AOD-OSDMA) technique. In AOD-OSDMA, the knowledge of angles-of-departure (AODs) at the BS of the strongest signal received by each user is used to design multiple opportunistic beams so that advantage is made of the clustering nature of wireless channels. Compared to the OSDMA-S using 4 × 2 (8 × 2) MIMO system, the proposed technique provides gains in system capacity of up to 50% (160%), and reduces the number of channel directional feedback bits by 33% (55%), when evaluated using MIMO directional channel model such as WINNER.