Method and apparatus for synchronizing a receiver to a transmitted signal while conserving power
First Claim
1. A method for synchronizing a receiver to a transmitted signal, the transmitted signal having a first predetermined signal for indicating a start of a new transmission to the receiver and having a second predetermined signal inserted at periodic sampling time intervals for synchronizing the receiver to the transmitted signal, the method comprising the steps of:
- (a) synchronizing to the transmitted signal by detecting the first predetermined signal followed by the second predetermined signal, and establishing subsequent periodic sampling time intervals therefrom;
(b) conserving power in the receiver during a second portion of one of the periodic sampling time intervals following a detection of a first portion of the second predetermined signal during a first portion of the one of the periodic sampling time intervals; and
(c) searching for a portion of the first predetermined signal during the second portion of the one of the periodic sampling time intervals following a lack of detection of the first portion of the second predetermined signal during the first portion of the one of the periodic sampling time intervals.
1 Assignment
0 Petitions
Accused Products
Abstract
A receiver (200) receives (203) a transmitted signal having a first predetermined signal for indicating a start of a new transmission to the receiver and having a second predetermined signal inserted at periodic sampling time intervals for synchronizing the receiver to the transmitted signal. The receiver (200) synchronizes to the transmitted signal by detecting the first predetermined signal (208) followed by the second predetermined signal (210), and establishing subsequent periodic sampling time intervals therefrom. The receiver (200) conserves power (228) during a second portion of a periodic sampling time interval following a detection of a first portion of the second predetermined signal (210) during a first portion of the periodic sampling time interval. If the receiver (200) does not detect the first portion of the second predetermined signal (210) then the receiver (200) searches for a portion of the first predetermined signal (208) during the second portion of the periodic sampling time interval to determine a possible start of a new transmission.
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Citations
17 Claims
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1. A method for synchronizing a receiver to a transmitted signal, the transmitted signal having a first predetermined signal for indicating a start of a new transmission to the receiver and having a second predetermined signal inserted at periodic sampling time intervals for synchronizing the receiver to the transmitted signal, the method comprising the steps of:
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(a) synchronizing to the transmitted signal by detecting the first predetermined signal followed by the second predetermined signal, and establishing subsequent periodic sampling time intervals therefrom; (b) conserving power in the receiver during a second portion of one of the periodic sampling time intervals following a detection of a first portion of the second predetermined signal during a first portion of the one of the periodic sampling time intervals; and (c) searching for a portion of the first predetermined signal during the second portion of the one of the periodic sampling time intervals following a lack of detection of the first portion of the second predetermined signal during the first portion of the one of the periodic sampling time intervals. - View Dependent Claims (2)
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3. A method for synchronizing a receiver to a transmitted signal while conserving power within the receiver, the transmitted signal having a first predetermined signal for indicating the start of a new transmission to the receiver and having a second predetermined signal inserted at periodic sampling time intervals for synchronizing the receiver to the transmitted signal, the method comprising the steps of:
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(a) receiving and detecting the first predetermined signal followed by the second predetermined signal for obtaining synchronization of the receiver with the transmitted signal and for establishing periodic sampling time intervals from the second predetermined signal for detecting subsequently transmitted second predetermined signals; (b) receiving and recovering a first information signal during a first portion of one of the periodic sampling time intervals; (c) determining whether the first information signal matches a first portion of the second predetermined signal, thereby constituting a detection of the second predetermined signal to maintain synchronization with the transmitted signal; (d) conserving power during a second portion of the one of the periodic sampling time intervals following the detection of the second predetermined signal during the first portion of the one of the periodic sampling time intervals; (e) receiving and recovering a second information signal during the second portion of the one of the periodic sampling time intervals following the lack of detection of the second predetermined signal during the first portion of the one of the periodic sampling time intervals; and (f) determining whether the second information signal matches a portion of the first predetermined signal, thereby constituting a detection of the first predetermined signal indicating the start of a new transmission. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A receiver comprising:
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receiving means for receiving a transmitted signal having a first predetermined signal for indicating a start of a new transmission to the receiver, and having a second predetermined signal inserted at periodic sampling time intervals for synchronizing the receiver to the transmitted signal; control means coupled to the receiving means for obtaining synchronization to the transmitted signal in response to a detection of a first occurrence of the second predetermined signal, and for establishing periodic sampling time intervals therefrom, and further for maintaining synchronization to the transmitted signal by detecting a first portion of the second predetermined signal during the first portion of one of the established periodic sampling time intervals; power conserving means responsive to the control means for disabling the receiving means to conserve power during a second portion of one of the established periodic sampling time intervals following the detection of a first portion of the second predetermined signal during the first portion of the one of the established periodic sampling time intervals; and transmission synchronizing means coupled to the receiving means and the control means for determining the start of a new transmission in response to a detection of a portion of the first predetermined signal during the second portion of the one of the established periodic sampling time intervals following the lack of detection of the first portion of the second predetermined signal during the first portion of the one of the established periodic sampling time intervals. - View Dependent Claims (14, 15, 16, 17)
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Specification