• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

Spectrum Sharing SDMA with Limited Feedback: Throughput Analysis

Vol. 6, No.12, December 31, 2012
10.3837/tiis.2012.12.012, Download Paper (Free):

Abstract

In the context of effective usage of a scarce spectrum resource, emerging wireless communication standards will demand spectrum sharing with existing systems as well as multiple access with higher spectral efficiency. We mathematically analyze the sum throughput of a spectrum sharing space-division multiple access (SDMA) system, which forms a transmit null in the direction of other coexisting systems while satisfying orthogonal beamforming constraints. For a large number of users , the SDMA throughput scales as at high signal-to-noise ratio (SNR) ((J - 1) at normal SNR), where is the number of transmit antennas. This indicates that multiplexing gain of the spectrum sharing SDMA is (J ? 1)/J__times less than that of the non-spectrum sharing SDMA only using orthogonal beamforming, whereas no loss in multiuser diversity gain. Although the spectrum sharing SDMA always has lower throughput compared to the non-spectrum sharing SDMA in the non-coexistence scenario, it offers an intriguing opportunity to reuse spectrum already allocated to other coexisting systems.


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Cite this article

[IEEE Style]
Han-Shin Jo, "Spectrum Sharing SDMA with Limited Feedback: Throughput Analysis," KSII Transactions on Internet and Information Systems, vol. 6, no. 12, pp. 3237-3256, 2012. DOI: 10.3837/tiis.2012.12.012

[ACM Style]
Jo, H. 2012. Spectrum Sharing SDMA with Limited Feedback: Throughput Analysis. KSII Transactions on Internet and Information Systems, 6, 12, (2012), 3237-3256. DOI: 10.3837/tiis.2012.12.012