Method of controlling synchronization signal power in a communication system
First Claim
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1. A method of synchronizing a first station to a second station in a communication system, comprising the steps of:
- (a) generating a synchronization signal at said first station;
(b) sending said synchronization signal from said first station to said second station at a first power level;
(c) detecting said synchronization signal at said second station and acquiring synchronization therewith;
(d) sending a synchronization-acquisition message from said second station to said first station;
(e) reducing said synchronization signal to a second power level lower than said first power level;
(f) generating, at said first station, a modulated data signal, said modulated data signal being modulated in synchronization with said synchronization signal;
(g) sending both said synchronization signal and said modulated data signal from said first station to said second station, said synchronization signal being at said second power level and said modulated data signal being at a power level higher than said second power level; and
(h) demodulating said modulated data signal at said second station, in synchronization with said synchronization signal.
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Abstract
To initiate communication, a first station generates a synchronization signal and sends the synchronization signal to a second station. When the second station detects the synchronization signal, the second station acquires synchronization and sends a synchronization-acquisition message back to the first station. The first station now reduces the power of the synchronization signal, while continuing to send the synchronization signal, and also begins sending a modulated data signal. The second station uses the synchronization signal to maintain synchronization for demodulating the data signal.
74 Citations
20 Claims
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1. A method of synchronizing a first station to a second station in a communication system, comprising the steps of:
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(a) generating a synchronization signal at said first station; (b) sending said synchronization signal from said first station to said second station at a first power level; (c) detecting said synchronization signal at said second station and acquiring synchronization therewith; (d) sending a synchronization-acquisition message from said second station to said first station; (e) reducing said synchronization signal to a second power level lower than said first power level; (f) generating, at said first station, a modulated data signal, said modulated data signal being modulated in synchronization with said synchronization signal; (g) sending both said synchronization signal and said modulated data signal from said first station to said second station, said synchronization signal being at said second power level and said modulated data signal being at a power level higher than said second power level; and (h) demodulating said modulated data signal at said second station, in synchronization with said synchronization signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for communication between a first station and a second station, comprising:
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a synchronization-signal generator disposed in said first station, for generating a synchronization signal; a variable-gain amplifier coupled to said synchronization-signal generator, for outputting said synchronization signal at a power level responsive to a first control signal; an adder coupled to said variable-gain amplifier, for adding a data signal to the synchronization signal output by said variable-gain amplifier, responsive to a second control signal, to create a first communication signal; a communication channel for transmitting said first communication signal from said first station to said second station, and for transmitting a second communication signal from said second station to said first station; a first controller coupled to said variable-gain amplifier, for detecting a synchronization-acquisition message in said second communication signal, and for generating said first control signal and said second control signal responsive to said synchronization-acquisition message; and a second controller disposed in said second station, for detecting said synchronization signal in said first communication signal, and for generating said synchronization-acquisition message. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification