Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-08-15
2000-04-04
Le, Thanh Cong
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455561, 455 671, H04Q 730
Patent
active
060471999
ABSTRACT:
A system and method for transmitting cellular signals has linear power amplifiers mounted on a cellular tower within a tower circuit. The linear power amplifiers provide the primary amplification of the signals which are transmitted by the antennas on the tower. By moving the amplifiers from a base station to the tower circuit, the system and method can employ less-expensive and more-reliable amplifiers and need not employ high-cost low-loss feeder lines. The tower circuit also includes a modulator for transmitting status signals down to the base station. The base station includes a demodulator for receiving the status signals and a control circuit for placing a switching circuit in a desired one of a plurality of modes based on the status of the tower circuit. The switching circuit, in a first mode, passes radio signals from combiners to their respective feeder lines and thus to their respective amplifiers and antennas when all transmission paths are operational. If a fault occurs along one or more transmission path, the switching circuit combines the radio signals from the combiners associated with the faulty amplifiers with the radio signals associated with an operational antenna and directs the combined set of radio signals to the operational antenna. In this manner, the system and method provide a redundancy path whereby a fault in the tower circuit does not result in any transmission loss.
REFERENCES:
patent: 5570098 (1996-10-01), Searle et al.
patent: 5675371 (1997-10-01), Barringer
patent: 5752161 (1998-05-01), Jantti et al.
patent: 5809395 (1998-09-01), Hamilton-Piercy
BellSouth Intellectual Property Corporation
Cong Le Thanh
Ewing, IV James L.
Sutcliffe Geoff L.
Wyche Myron K.
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