Base station oscillator tuned with received clock signal

Details Base station oscillator tuned with received clock signal Base station oscillator tuned with received clock signal

1997-08-27

1998-10-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 375376, H03L 7085

Patent

active

058218190

ABSTRACT:
To generate a carrier frequency, a base station needs an oscillator with a long-term stability better than 5.multidot.10.sup.-8. In the case of crystal oscillators it is therefore necessary to regularly adjust the frequency so as to compensate for frequency drift due to aging. The oscillator (OSC) of a base station (BTS) is automatically tuned with the pulse repetition frequency of the clock (CLK) of a digital communication signal (STM). To prevent variations in the pulse repetition frequency of the clock (CLK) from affecting the stability of the carrier frequency (CAR), the oscillator (OSC) is only tuned during times that a quality indicator contained in the digital communication signal (STM) guarantees a high frequency accuracy of 10.sup.-11.

REFERENCES:
patent: 4847569 (1989-07-01), Dudziak et al.
patent: 5028885 (1991-07-01), Voigt et al.
patent: 5113416 (1992-05-01), Lindell
patent: 5392005 (1995-02-01), Bortolini et al.
patent: 5473284 (1995-12-01), Jantti et al.
ITU-T Recommendation G.70X (Draft); "General Aspects of Digital Transmission Systems: Network Node Interface for the Synchronous Digital Hierarchy (SDH)", Mar. 1995, pp. 55-56.
ITU-T Recommendation G.704, Study Group 15, Contribution 108, Oct. 1994, pp. 17-18.
ITU-T Recommendation G.8111, Digital Networks: Timing Requirements at the Outputs of Primary Reference Clocks Suitable for Plesio-chronous Operation of International Digital Links, 1988; 1993. pp. 1-6.
"Compact Ovenized Crystal Oscillators with Internal Synchronization to Standard Frequency Transmitters", B. Neubig et al, 15th Piezo-electric Devices Conf. and Exhibition, Washington DC, Sep. 21-23, 1993, pp. 20-23.

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