Excess bandwidth is necessary for ISI-free double-filter receivers

Author

Mengali, Umberto ; Vitetta, Giorgio M. ; Taylor, Desmond P.

Author_Institution

Dept. of Inf. Eng., Pisa Univ., Italy

Volume

2

Issue

2

fYear

1998

Firstpage

48

Lastpage

50

Abstract

Previous work has indicated that highly effective double-filter receivers can be implemented for phase-shift keying (PSK) transmissions over linearly time-selective fading channels provided that the transmitter and receiver filters have root-raised-cosine transfer functions with unity rolloff factor. Revisiting the detection problem within the frame of maximum-likelihood (ML) sequence estimation we prove that this filter design is unique within the class of signaling pulses which are band limited to the symbol rate. It is concluded that some waste of bandwidth is inevitable for achieving ISI-free operation with double-filter receivers.

Keywords

estimation theory; fading; filtering theory; interference suppression; intersymbol interference; maximum likelihood detection; maximum likelihood estimation; phase shift keying; receivers; telecommunication signalling; transfer functions; transmitters; ISI-free double-filter receivers; PSK transmissions; band limited signaling pulses; bandwidth; detection problem; linearly time-selective fading channels; maximum-likelihood sequence estimation; phase-shift keying; root-raised-cosine transfer functions; symbol rate; unity rolloff factor; Bandwidth; Fading; Filtering theory; Filters; Maximum likelihood estimation; Phase shift keying; Pulse shaping methods; Signal detection; Signal processing; Transmitters;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/4234.660800

Filename

660800