Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1996-06-07
2000-05-23
Tsang, Fan
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
455446, 455 381, 455561, 34082544, 370328, 370465, H04Q 0706
Patent
active
060674458
ABSTRACT:
The effective transmission range of a wireless paging system is varied by changing the transmission data rate. The transmission data rate is lowered in regions with sparse transmitter coverage to increase the effective transmission range of the transmitter. The dual transmission data rates are transmitted either on separate subcarriers on the same FM channel, on the same subcarrier of different FM channels or alternatively on different subcarriers of different FM channels. In a region with dense transmission coverage, the receiver decodes transmission messages at the faster transmission data rate. In regions with sparce transmission coverage, the receiver decodes messages at the slower transmission data rate.
REFERENCES:
patent: 5361399 (1994-11-01), Linquist et al.
patent: 5434859 (1995-07-01), Levardon
patent: 5590405 (1996-12-01), Daly et al.
patent: 5649297 (1997-07-01), Park
patent: 5841806 (1998-11-01), Gilhousen et al.
Gray Kenneth G.
Park Daniel J.
Galbi Elmer
Seiko Communications Systems Inc.
Sobutka Philip J.
Tsang Fan
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