On the Capacity of Large-MIMO Block-Fading Channels
Artikel i vetenskaplig tidskrift, 2013

We characterize the capacity of Rayleigh block-fading multiple-input multiple-output (MIMO) channels in the noncoherent setting where transmitter and receiver have no a priori knowledge of the realizations of the fading channel. We prove that unitary space-time modulation (USTM) is not capacity-achieving in the high signal-to-noise ratio (SNR) regime when the total number of antennas exceeds the coherence time of the fading channel (expressed in multiples of the symbol duration), a situation that is relevant for MIMO systems with large antenna arrays (large-MIMO systems). This result settles a conjecture by Zheng & Tse (2002) in the affirmative. The capacity-achieving input signal, which we refer to as Beta-variate space-time modulation (BSTM), turns out to be the product of a unitary isotropically distributed random matrix, and a diagonal matrix whose nonzero entries are distributed as the square-root of the eigenvalues of a Beta-distributed random matrix of appropriate size. Numerical results illustrate that using BSTM instead of USTM in large-MIMO systems yields a rate gain as large as 13% for SNR values of practical interest.

noncoherent setting

large-MIMO systems

ergodic capacity

Block-fading channel

Författare

Wei Yang

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Giuseppe Durisi

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Erwin Riegler

Technische Universität Wien

IEEE Journal on Selected Areas in Communications

0733-8716 (ISSN)

Vol. 31 2 117-132 6415385

Styrkeområden

Informations- och kommunikationsteknik

Ämneskategorier

Telekommunikation

DOI

10.1109/JSAC.2013.130202

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Senast uppdaterat

2018-03-02