Telecommunications – Transmitter and receiver at separate stations
Patent
1993-02-11
1995-04-25
Urban, Edward F.
Telecommunications
Transmitter and receiver at separate stations
455 561, 455 671, 455311, 4552262, H04Q 734
Patent
active
054107334
ABSTRACT:
A method, and apparatus for accomplishing the method, that causes the power of a narrow bandwidth signal to be spread to a wider bandwidth. The method operates by modulating the power of the spectral components that are located close to a carrier frequency. This reduces the DC component of a base band signal and correspondingly reduces the charging of a AC coupling capacitors in the base band circuitry. As a result, receiver recovery time is increased, and a more accurate signal strength estimate is made by a mobile telephone. In one embodiment of the invention a local oscillator signal (LO1) for an IF stage is first offset from a nominal frequency for an RF channel to be measured, and is then subsequently made equal to the nominal frequency. The variation in LO1 introduces phase noise which results in the modulation of the base band signal.
REFERENCES:
patent: 4872204 (1989-10-01), Hammer et al.
patent: 5003621 (1991-03-01), Gailus
patent: 5142695 (1992-08-01), Roberts et al.
patent: 5260943 (1993-11-01), Comroe et al.
EIA/TIA Interim Standard, "Cellular System Dual-Mode Mobile Station-Base Station Compatibility Standard", IS-54-B, Apr. 1992, pp. 102-106.
Niva Ilkka
Tuutijarvi Mika
Lin Mary M.
Nokia Mobile Phones Ltd.
Urban Edward F.
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