Field Trial of a Space-Time Equalizer for TDMA Mobile Communications in a Suburban Micro-Cell Environment

Takeshi TODA
Yuukichi AIHARA
Yukiyoshi KAMIO
Jun-ichi TAKADA

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.6    pp.1954-1960
Publication Date: 2003/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
delay spread,  envelope cross-correlation,  inter-symbol interference,  space and path diversity,  space-time equalizer,  TDMA mobile communications,  

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A field trial, within a suburban macro-cell environment, of a space-time (ST) equalizer for TDMA mobile communication systems is described. The ST equalizer was a cascade connection of two array processors for a four-antenna array and a two-branch-metric-combining maximum-likelihood sequence estimation (MLSE) that was designed to obtain full space- and path-diversity gains from first-arrival and one-symbol-delayed signals while suppressing excessively long-delayed inter-symbol interference (ISI). The radio frequency was 3.35 GHz, the transmission rate was 4.096 Mb/s, and the modulation was QPSK. The long-delayed ISI reduction and the space-path diversity effect of the ST equalizer was validated by Eb/N0 vs. bit-error-rate (BER) curves with respect to delay spread and antenna spacing as compared with the case of an array processor alone being used.