Summary: Overview and Comparison of Equalization Schemes for SpaceTimeCoded
Signals with Application to EDGE
AT&T Shannon Laboratory
Florham Park, NJ 07932
Keywords : Equalizers, SpaceTime Coding, Broadband Wireless, MIMO, EDGE.
This paper describes and compares several practical equalization schemes for space--time--coded transmis
sions over broadband wireless channels. For space--time trellis codes, we describe and compare two reduced--
complexity trellis--based joint equalization and decoding schemes whose performance is further optimized by
a front--end FIR channel--shortening prefilter. For space--time block codes, we describe and compare three
joint equalization and decoding schemes based on a block--level implementation of the well--known Alamouti
scheme either in the time or frequency domains.
We consider the third--generation TDMA cellular system EDGE and recommend a promising equalization
scheme for space--time trellis--coded and for Alamouti--type space--time block--coded dual--antenna transmis
sions based on simulation results for typical urban channel conditions where the delay spread is few symbol
Achieving high bit rates over broadband wireless channels brings the dream of the wireless Internet,
and its plethora of interactive multimedia services and applications for users at any place and any time,