Increasing System Capacity in Uplink Multiuser MIMO Using Sparsity Exploiting Receiver

Datta, Tanumay and Chockalingam, A (2012) Increasing System Capacity in Uplink Multiuser MIMO Using Sparsity Exploiting Receiver. In: IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC),, SEP 09-12, 2012, Sydney, AUSTRALIA,, pp. 2220-2225.

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Abstract

In multiuser communication on the uplink, all subscribed users may not be active simultaneously. This leads to sparsity in the activity pattern in the users' transmissions, which can be exploited in the multiuser MIMO receiver at the base station (BS). Because of no transmissions from inactive users, joint detection at the BS has to consider an augmented signal set that includes zero. In this paper, we propose a receiver that exploits this inactivity-induced sparsity and considers the zero-augmented signal set. The proposed receiver is based on Markov Chain Monte Carlo techniques. Near-optimal performance and increased system capacity (in terms of number of users in the system) are demonstrated. For example, a multiuser MIMO system with N = 32 receive antennas at the BS and an user activity factor of 0.2 supports 51 uplink users meeting a QoS of 10(-3) coded bit error rate.

Item Type:	Conference Paper
Series.:	IEEE International Symposium on Personal Indoor and Mobile Radio Communications Workshops-PIMRC
Publisher:	IEEE
Additional Information:	Copyright for this article belongs to IEEE, NEW YORK
Keywords:	Sparse signal detection;uplink multiuser MIMO;user activity;MCMC techniques;system capacity
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	12 Feb 2013 10:59
Last Modified:	12 Feb 2013 10:59
URI:	http://eprints.iisc.ac.in/id/eprint/45803

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