Dual channel dual speed FM subcarrier paging system

Details Dual channel dual speed FM subcarrier paging system Dual channel dual speed FM subcarrier paging system

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.

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