Paging satelite line receiver having automatic signal acquisition

• US 5,708,964 A
• Filed: 08/10/1995
• Issued: 01/13/1998
• Est. Priority Date: 08/10/1995
• Status: Expired due to Term

• Current Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Original Assignee: Glenayre Electronics Incorporated (EDCI Holdings Incorporated)
• Inventors: Meger, Eric A., Hoyt, Riley S.
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US08/513,546
• Time in Patent Office: 887 Days
• Field of Search: 455/161.1, 455/161.2, 455/161.3, 455/184.1, 455/164.1, 455/164.2, 455/12.1, 455/23.1, 455/13.2, 455/33.1, 455/34.2, 455/51.2, 455/54.1, 455/56.1, 455/227, 455/226.1, 455/229, 455/226.2, 455/67.1, 455/67.3, 455/38.1, 455/38.2, 455/458, 455/426, 455/427, 455/31.3, 340/825.44, 340/825.21
• US Class Current: 455/12.1
• CPC Class Codes: H04B 7/18517 Transmission equipment in earth stations
• CPC Class Codes: H04B 7/18567 Arrangements for providing additional services to the basic mobile satellite telephony service

Abstract

A satellite receiver includes a signal acquisition unit that is operative to receive a validation signal from a station controller located at a paging station. The satellite receiver is operative to lock onto a satellite signal. When the satellite receiver locks onto a satellite signal, the satellite receiver demodulates the satellite signal into a digital data stream that is forwarded to the station controller for packaging and retransmission as a page. The station controller includes circuitry to determine if the digital data stream is correct and intended for the station controller. If the digital data stream is correct, the station controller generates a validation signal and forwards the validation signal to the signal acquisition unit of the satellite receiver. If the digital data stream is incorrect, the station controller will forward a negative validation signal to the signal acquisition unit. In response to the negative validation signal, the signal acquisition unit will cause the satellite receiver to continue scanning the predetermined frequency range for other satellite signals.

Claims

1. A satellite receiver for use in a paging system having a plurality of paging stations, said plurality of paging stations each having resident therein a station controller, said satellite receiver associated with one of said paging stations, said satellite receiver comprising:

(a) an antenna for receiving a satellite signal and routing said satellite signal to said station controller of said one of said paging stations, said station controller including circuitry for analyzing said satellite signal and providing a positive validation signal if said satellite signal is valid and providing a negative validation signal if said satellite signal is invalid;

(b) a tuner for tuning to a specified frequency within a predetermined frequency range such that said satellite signal is received; and

(c) a signal acquisition unit coupled to said tuner and operative to receive said validation signal from said station controller, said signal acquisition unit operative upon receipt of said positive validation signal to cause said tuner to lock onto said satellite signal, and said signal acquisition unit operative upon receipt of said negative validation signal to cause said tuner to continue scanning said predetermined frequency range for another said satellite signal.

2. The satellite receiver of claim 1 further including a demodulator coupled to said antenna and operative to demodulate said satellite signal into a digital data stream, said demodulator providing said digital data stream to said station controller resident in each of said paging stations, said station controller analyzing said digital data stream and providing said positive validation signal if said digital data stream is valid and providing said negative validation signal if said digital data stream in invalid.

3. A method of locking onto a valid satellite signal transmitted by a satellite to a paging station, said paging station associated with a satellite receiver and including a station controller, said station controller for issuing validation signals, said method comprising the steps of:

(a) scanning a predetermined frequency range for a candidate signal;

(b) locking onto said candidate signal;

(c) providing said candidate signal to said station controller;

(d) awaiting and receiving a positive validation signal or a negative validation signal from said station controller, said validation signal from said station controller indicative of the validity of said candidate signal;

(e) locking onto said candidate signal as said valid satellite signal if said validation signal is positive; and

(f) repeating steps (a)-(e) until said validation signal is positive if said validation signal is negative.

4. The method of claim 3, further including the step of demodulating said candidate signal into a digital data stream prior to providing said digital data stream to said station controller.

5. The method of claim 4 further including the step of wherein said station controller provides a positive validation signal if said digital data stream includes a link D that is assigned to said satellite receiver.

6. A satellite receiver for use in a paging system having a plurality of paging stations, said plurality of paging stations each having resident therein a station controller, said satellite receiver associated with one of said paging stations, said satellite receiver comprising:

(a) an antenna for receiving a satellite signal and routing said satellite signal to said station controller of said one of said paging stations, said station controller including circuitry for analyzing said satellite signal and providing a positive validation signal if said satellite signal is valid;

(b) a tuner for tuning to a specified frequency within a predetermined frequency range such that said satellite signal is received; and

(c) a signal acquisition unit operative to receive said validation signal from said station controller, said signal acquisition unit operative upon receipt of said validation signal to cause said tuner to lock onto said satellite signal, and said signal acquisition unit operative in the absence of said validation signal to cause said tuner to continue scanning said predetermined frequency range for another said satellite signal.

7. The satellite receiver of claim 6 further including a demodulator coupled to said antenna and operative to demodulate said satellite signal into a digital data stream, said demodulator providing said digital data stream to said station controller resident in each of said paging stations, said station controller analyzing said digital data stream and providing said validation signal only if said digital data stream is valid.

8. A method of locking onto a valid satellite signal transmitted by a satellite to a paging station, said paging station associated with a satellite receiver and including a station controller, said station controller for issuing validation signals, said method comprising the steps of:

(a) scanning a predetermined frequency range for a candidate signal;

(b) locking onto said candidate signal;

(c) providing said candidate signal to said station controller;

(d) awaiting and receiving a positive validation signal from said station controller, said validation signal from said station controller indicative of the validity of said candidate signal;

(e) locking onto said candidate signal as said valid satellite signal if said validation signal is received; and

(f) repeating steps (a)-(e) until said validation signal is received.

9. The method of claim 8, further including the step of demodulating said candidate signal into a digital data stream prior to providing said digital data stream to said station controller.