Optimum loop bandwidth of phase-locked modulators

Author

Field, P.L. ; Jones, A.E. ; Gardiner, J.G.

fYear

1992

fDate

16-16 Nov. 1992

Firstpage

42552

Lastpage

42494

Abstract

For the purposes of the paper, ´modulation coding´ is a generic term used to indicate the direct upward frequency translation of a unipolar baseband signal to that of a bipolar or higher-bipolar bandpass signal within the theoretical minimum bandwidth, or a sub-multiple thereof, by means of a single modulation process: the quasi-analogue nature of the resulting intersymbol interference waveform being eminently suitable for transmission media characterised by Doppler shift and fading due to multipath propagation. Data recovery is from a reconstituted three-level waveform derived from the structural information content of the received bandpass spectrum. Extrapolation of the results obtained with an experimental model is used to identify the inherent potential of the technique for achieving operational data capacities indeterminately greater than the theoretical maximum within the Nyquist bandwidth.<>

Keywords

data communication systems; encoding; mobile radio systems; modulation; signal detection; Doppler shift; Nyquist bandwidth; bandpass data transmission; bandpass spectrum; bipolar bandpass signal; data capacities; data recovery; experimental model; extrapolation; fading; intersymbol interference waveform; minimum bandwidth; modulation coding; multipath propagation; structural information content; transmission media; unipolar baseband signal; upward frequency translation; Data communication; Encoding; Modulation; Signal detection;

fLanguage

English

Publisher

iet

Conference_Titel

Advanced Modulation and Channel Coding Techniques for Mobile and Personal Communications, IEE Colloquium on

Conference_Location

London, UK

Type

conf

Filename

287291