Title :
Multi-user decision-feedback space-time equalization and diversity reception
Author :
Roy, Sebastien ; Falconer, David D.
Author_Institution :
Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada
Abstract :
This paper investigates optimum infinite-length multi-user decision-feedback space-time equalization implemented with cross-feedback filters in order to remove not only post-cursor ISI but also post-cursor CCI. Closed-form expressions are derived for the optimal feedforward and feedback filters as well as the minimum achievable MSE (mean-square error) as a function of channel spectra for a one-antenna system in the ideal case, i.e. where cross-feedback filters are available for all interferers. Those results are then generalized with the help of a single-channel equivalent model to the multiple-antenna (space-time) case. Monte Carlo simulation results are provided comparing the MMSE obtainable with multi-user DFE, with standard DFE, with linear equalization (LE) and the matched filter bound in Rayleigh fading channels
Keywords :
Monte Carlo methods; Rayleigh channels; cellular radio; decision feedback equalisers; digital simulation; diversity reception; feedforward; filtering theory; interference suppression; intersymbol interference; least mean squares methods; multiuser channels; MMSE; MSE; Monte Carlo simulation results; Rayleigh fading channels; cellular radio; channel spectra; closed-form expressions; cross-feedback filters; diversity reception; linear equalization; matched filter bound; mean-square error; multi-user DFE; multi-user decision-feedback space-time equalization; multiple-antenna; one-antenna system; optimal feedback filter; optimal feedforward filter; optimum infinite-length equalization; post-cursor CCI; post-cursor ISI; single-channel equivalent model; standard DFE; Antenna arrays; Closed-form solution; Decision feedback equalizers; Diversity reception; Electronic mail; Fading; Frequency; Matched filters; Radiofrequency interference; Systems engineering and theory;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.778104
