Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Patent
1990-07-27
1993-07-20
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
455 676, 4552261, 455296, 455343, H04B 1500, H04B 116
Patent
active
052300773
ABSTRACT:
In a receiving circuit of a mobile telephone apparatus the incoming baseband signals are demodulated and equalized so as to compensate for deficiencies (multipath propagation) of the radio medium between base station and mobile telephone apparatus. It is not, however, always necessary to equalize the demodulated signals, for instance at low symbol rates or in the case of monopath propagation. According to the invention, time dispersion of the received signals is estimated prior to demodulation, and demodulation with equalization (3a) is effected when the time dispersion is established to be higher than a given value, whereas demodulation without equalization (3b) is effected when the time dispersion is lower than this value. This will enable the power consumed by the receiving circuit to be reduced, particularly in the listening mode of the apparatus.
REFERENCES:
patent: 4803739 (1989-02-01), Daikoku et al.
patent: 4823398 (1989-04-01), Hashimoto
patent: 5014283 (1991-05-01), Baier
Belzer Christine K.
Eisenzopf Reinhard J.
Telefonaktiebolaget L M Ericsson
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