Communication system with bit sampling method in portable receiver for simulcast communication
First Claim
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1. A method for calibrating a simulcast communication system comprising at least two transmitting sites and at least one selective call receiver, the method comprising the steps of:
- (a) sequentially transmitting from each of said at least two transmitting sites a predetermined signal to provide sequentially transmitted signals;
(b) receiving said sequentially transmitted signals by said at least one selective call receiver to provide received sequential signals;
(c) determining to what extent said received sequential signals overlap;
(d) transmitting a simulcast signal from said at least two transmitting sites; and
(e) receiving said simulcast signal by sampling said simulcast signal by a receiving means of said at least one selective call receiver at sample times determined in accordance with step (c).
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Abstract
Receivers synchronize to signals sequentially transmitted from several transmitters prior to receiving signals simulcast by the transmitters. The relative delay differential of the received sequential signals is measured and used to determine the optimal sampling positions for the simulcast signals.
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Citations
20 Claims
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1. A method for calibrating a simulcast communication system comprising at least two transmitting sites and at least one selective call receiver, the method comprising the steps of:
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(a) sequentially transmitting from each of said at least two transmitting sites a predetermined signal to provide sequentially transmitted signals; (b) receiving said sequentially transmitted signals by said at least one selective call receiver to provide received sequential signals; (c) determining to what extent said received sequential signals overlap; (d) transmitting a simulcast signal from said at least two transmitting sites; and (e) receiving said simulcast signal by sampling said simulcast signal by a receiving means of said at least one selective call receiver at sample times determined in accordance with step (c). - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for receiving a simulcast signal from a plurality of transmitters, said apparatus comprising:
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first means for receiving said simulcast signal and calibration signals, said calibration signals comprising sequential signals transmitted sequentially from said plurality of transmitters; second means coupled to said first means for determining to what extent said calibration signals overlap; third means coupled to said first means for sampling said simulcast signal at sampling times; and fourth means, coupled to said first means and said second means, for adjusting said third means by adjusting said sampling times in response to the extent said calibration signals overlap. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus for receiving a simulcast signal from a plurality of transmitters, said apparatus comprising:
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first means for receiving said simulcast signal and calibration signals, said calibration signals comprising sequential signals transmitted sequentially from said plurality of transmitters; second means coupled to said first means for determining to what extent said calibration signals overlap; third means coupled to said first means for sampling said simulcast signal at sampling times; and fourth means, coupled to said first means and said second means, for adjusting said third means by adjusting said sampling times to sample said simulcast signal at overlap times, said overlap times determined in response to the extent of said calibration signals overlap. - View Dependent Claims (13, 19)
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14. An apparatus for receiving a simulcast signal, said apparatus comprising:
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first means for receiving the simulcast signal; second means for receiving sequential calibration signals to provide received sequential signals; and third means coupled to said second means and said first means for calibrating said first means by comparing said received sequential signals and determining sampling times therefrom for sampling said simulcast signal. - View Dependent Claims (15, 16, 17, 18, 20)
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Specification