Hand-off filter for cellular mobile radio

Details Hand-off filter for cellular mobile radio Hand-off filter for cellular mobile radio

1984-06-11

1985-12-03

Rubinson, Gene Z.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 33, 455 56, 455 69, H04Q 704

Patent

active

045567603

ABSTRACT:
A cellular mobile radio-telephone system incorporates hand-off equipment for effecting a hand-off of communication links coupled to a mobile subscriber transceiver as the transceiver travels from one cell to an adjoining cell. The hand-off equipment includes a filter which smoothes voice channel signals received from the mobile transceivers so as to permit a more precise determination as to when a reduction in signal amplitude indicates the need for a hand-off. The operation of the filter includes long and short term averaging of a sequence of signal samples. Circuitry is also provided for predicting a time of signal fade-out based on differences in the amplitude of successive samples or groups of samples. Also disclosed is circuitry for commanding a change in transmitter gain in a transceiver as a function of signal fade-out.

REFERENCES:
patent: 4475010 (1984-10-01), Huensch et al.
patent: 4485486 (1984-11-01), Webb et al.

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