Systems and methods for sharing reference frequency signals with

Details Systems and methods for sharing reference frequency signals with Systems and methods for sharing reference frequency signals with

1997-09-08

2000-03-21

Trost, William G.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455575, 455259, 4551881, H04B 140

Patent

active

060412224

ABSTRACT:
A wireless mobile terminal for a wireless communication system comprises a wireless transceiver, a global positioning system (GPS) receiver, wherein the wireless transceiver and the GPS receiver share a frequency reference signal. The frequency reference signal can be multiplied by an integer multiple to create a first local oscillator for a signal conversion to an intermediate frequency for signal processing of the GPS signal. In addition, the frequency reference signal can also be divided into a lower frequency to create a second local oscillator for a conversion to a second intermediate frequency. The frequency reference signal can also be divided to create a frequency necessary for other signal processing, such as an analog-to-digital converter sampling signal at the GPS receiver. The frequency reference signal can be taken from different places within the frequency synthesis mechanism of the wireless transceiver. For example, in one embodiment the frequency reference signal is a reference oscillator signal, in another embodiment the frequency reference signal is a radio frequency signal, and in yet another embodiment the frequency reference signal is a radio frequency control signal. Frequency error can be removed from the frequency reference signal by locking to a base station carrier.

REFERENCES:
patent: 5119504 (1992-06-01), Durboraw, III
patent: 5379224 (1995-01-01), Brown et al.
patent: 5535432 (1996-07-01), Dent
patent: 5663735 (1997-09-01), Eshenbach
patent: 5812591 (1998-09-01), Shumaker et al.
patent: 5841396 (1998-11-01), Krasner
International Search Report, PCT/US98/18304, Mar. 9, 1998.

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