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Efficient Feedback for Precoder Design in Single-and Multi-User MIMO Systems

Summary: Efficient Feedback for Precoder Design in
Single- and Multi-User MIMO Systems
Natasha Dharamdial and Raviraj Adve
Dept. of Elec. and Comp. Eng., Univ. of Toronto,
10 King's College Road
Toronto, Ontario M5S 3G4, Canada
Abstract-- Recently several researchers have proposed
downlink precoding to enhance the performance of
multiple-input, multiple-output (MIMO) systems. Precod-
ing has been used, for example, to transmit multiple data
streams to the same user, data streams to multiple users
and/or to improve the diversity order on a single data
transmission. These schemes, proposed for single- and
multi-user scenarios, combine data streams to achieve a
chosen optimality criterion. The precoding is based on
some channel knowledge, requiring feedback of channel
parameters from a mobile receiver to the transmitter.
Clearly, minimizing this overhead (measured here in terms
of an overall allocation for feedback bits) would be an im-
portant goal of any implementation. This paper develops a


Source: Adve, Raviraj - Department of Electrical and Computer Engineering, University of Toronto


Collections: Engineering