Power-Controlled Reverse Channel Training in a Multiuser TDD-MIMO Spatial Multiplexing System With CSIR

Bharath, BN and Murthy, Chandra R (2013) Power-Controlled Reverse Channel Training in a Multiuser TDD-MIMO Spatial Multiplexing System With CSIR. In: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 62 (9). pp. 4345-4356.

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Abstract

This paper considers the design of a power-controlled reverse channel training (RCT) scheme for spatial multiplexing (SM)-based data transmission along the dominant modes of the channel in a time-division duplex (TDD) multiple-input and multiple-output (MIMO) system, when channel knowledge is available at the receiver. A channel-dependent power-controlled RCT scheme is proposed, using which the transmitter estimates the beamforming (BF) vectors required for the forward-link SM data transmission. Tight approximate expressions for 1) the mean square error (MSE) in the estimate of the BF vectors, and 2) a capacity lower bound (CLB) for an SM system, are derived and used to optimize the parameters of the training sequence. Moreover, an extension of the channel-dependent training scheme and the data rate analysis to a multiuser scenario with M user terminals is presented. For the single-mode BF system, a closed-form expression for an upper bound on the average sum data rate is derived, which is shown to scale as ((L-c - L-B,L- tau)/L-c) log logM asymptotically in M, where L-c and L-B,L- tau are the channel coherence time and training duration, respectively. The significant performance gain offered by the proposed training sequence over the conventional constant-power orthogonal RCT sequence is demonstrated using Monte Carlo simulations.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	copyright for this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC,USA
Keywords:	Capacity lower bound (CLB); channel estimation; mean square error (MSE); reciprocal multiple-input-multiple-output (MIMO) system; spatial multiplexing (SM); training sequence design
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	22 Dec 2013 15:00
Last Modified:	22 Dec 2013 15:00
URI:	http://eprints.iisc.ac.in/id/eprint/47957

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