Multisensors receivers using a filtered reference: application to GSM

Abstract

There has been a great interest recently in multisensors receivers for reducing co-channel interferences (CCI) in radio-mobile communication systems like GSM. This paper first generalises the efficient multichannel Maximum Likelihood Sequence Estimator (MLSE) receiver introduced in [3] for stationary circular gaussian jammers to the more realistic model for GSM of cyclostationary non-circular jammers (modelling CCI) along with additive stationary circular Gaussian noise. Ideal adaptive structures for estimating the filters involved in the MLSE are then compared. Next, a suboptimal implementation of the resulting receiver is proposed: it consists of a spatio-temporal filter for CCI rejection followed by a Viterbi equalizer for IS1 processing. Simulations are performed in the GSM context.

Récepteurs SIMO MLSE Widely Linear. Structures et performances en présence d’interférences non circulaires

“…Pour cette raison, plusieurs récepteurs prenant en considération le caractère potentiellement non circulaire au second ordre des interférences co-canal ont été développés durant les 15 dernières années (Forster et al, 1998 ;Trigui, Slock, 1998 ;2000 ;Chevalier, Pipon, 2006 ;Meyer et al, 2006 ;Olivier, Kleynhans, 2007). Toutefois, alors que (Chevalier, Pipon, 2006 ;Meyer et al, 2006) supposent une absence d'interférence entre symboles, (Forster et al, 1998), et (Olivier, Kleynhans, 2007), ne proposent que des récepteurs sous-optimaux pour des canaux sélectifs en fréquence. Seul (Trigui, Slock, 1998 ;2000) considère le récepteur MLSE en présence d'interférence entre symboles et d'interférences co-canal potentiellement non circulaires au second ordre.…”

Optimal SIMO MLSE receivers for the detection of linear modulation corrupted by noncircular interference

“…To the best of our knowledge, few works about SIMO MLSE receivers for noncircular interferences have been published in the literature. Among them, [6] has derived the MLSE receiver in the context of real-valued SOI with no interference intersymbol and [7] has proposed a suboptimal MLSE receiver under the assumption of cyclostationarity and rectilinearity of the interference. Note that some other works have taken into account the potential noncircularity of the interference by proposing some suboptimal receivers (see, e.g., [8]).…”