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Asymptotic analysis of SDMA systems with near-orthogonal user scheduling (NEOUS) under imperfect CSIT

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1 Author(s)
Lau, V.K.N. ; Dept. of Electr. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong

In this paper, we focus on the asymptotic cross layer analysis of multi-antenna systems with transmit MMSE (Tx- MMSE) beamforming, near orthogonal scheduling and outdated CSIT. To capture the effect of the potential packet outage, we introduce the average system goodput, which measures the average b/s/Hz delivered to the mobiles successfully, as the system performance objective. We derive closed-form expressions for the optimal power and rate allocations as well as a low complexity near orthogonal user scheduling (NEOUS) algorithm to solve the cross-layer optimization problem.We derive the asymptotic order of growth in system goodput for general CSIT error variance sigma2 and found that for sufficiently large nT (number of antennas at the base station) and K (number of users) where K = g-1(nT ) for some strictly increasing function g(x) = o(x), the the system goodput grows in the order of nT log[(1- sigma2 ) logK] when sigma2 < 1. This is the same order of growth as the optimal order of growth in broadcast channels with perfect CSIT and hence, the NEOUS is order-optimal. On the other hand, we need exponentially larger K to compensate for the penalty in multiuser diversity gain due to CSIT errors.

Published in:

Communications, IEEE Transactions on  (Volume:57 ,  Issue: 3 )