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FiniteLength MIMO Decision Feedback Equalization for SpaceTime BlockCoded Signals over Multipath Fading Channels \Lambda

Summary: Finite­Length MIMO Decision Feedback Equalization for Space­Time
Block­Coded Signals over Multipath Fading Channels \Lambda
Naofal Al­Dhahir, Ayman F. Naguib y , and A.R. Calderbank
AT&T Shannon Laboratory
Florham Park, NJ 07932
Keywords : Equalizers, MIMO Systems, Diversity Methods, Multipath Channels
A finite--length optimized--delay multi--input multi--output mean--square--error decision--feedback
equalizer for space--time block--coded transmissions over multipath fading channels is presented. Alam­
outi's space--time block code with 2 transmit and 2 receive antenna on a typical urban EDGE channel is
taken as a case study. We propose a combined equalization and decoding scheme under the constraint of
linear processing complexity (no trellis search) at the receiver. Performance comparisons are made with
the single--transmit/single--receive antenna case and the case of multi--input multi--output feedforward
linear equalization only with no decision feedback.
I. Introduction
Enhanced data rates for GSM evolution (EDGE) standardization efforts aim at providing a
smooth transition from the current TDMA second generation digital cellular system (IS--136 and
GSM) to third generation systems supporting higher data rates and enhanced services [7].
Space--time block codes (STBC) [5, 10] use multiple transmit antennas to build spatial redun­
dancy in the transmitted signal such that maximum spatial diversity is achieved. For example,


Source: Al-Dhahir, Naofal - Department of Electrical Engineering, University of Texas at Dallas


Collections: Engineering