Apparatus and method for fine synchronization of a communication receiver
First Claim
1. A method for synchronizing a decoding means of a communication receiver, said method comprising the steps of:
- (a) receiving digitally encoded signals transmitted to the communication receiver, the digital signals including a bit synchronization signal(b) synchronizing the decoding means to the bit synchronization signal for generating a timing signal in response thereof;
(c) measuring a phase relationship between the timing signal and a subsequent portion of the received digitally encoded signals; and
(d) adjusting the timing signal on the basis of the measured phase relationship to establish a predetermined phase relationship between the timing signal and the remaining digitally encoded signals.
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Abstract
A system and method is described for synchronizing a paging receiver decoder to receive information in the form of digitally encoded signals. The digital signals include a synchronization signal followed by message data. The synchronization signal includes a first and second portion of the synchronization signal. The decoding means is synchronized to the first portion for generating a timing signal. The decoder then measures a phase relationship between the timing signal and the second portion of the synchronization signal. The timing signal generated by the decoder is adjusted according to the phase relationship to improve the decoding of the incoming information. In a second embodiment, a second synchronization signal is transmitted for statistically improving the accuracy of the timing signal.
101 Citations
31 Claims
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1. A method for synchronizing a decoding means of a communication receiver, said method comprising the steps of:
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(a) receiving digitally encoded signals transmitted to the communication receiver, the digital signals including a bit synchronization signal (b) synchronizing the decoding means to the bit synchronization signal for generating a timing signal in response thereof; (c) measuring a phase relationship between the timing signal and a subsequent portion of the received digitally encoded signals; and (d) adjusting the timing signal on the basis of the measured phase relationship to establish a predetermined phase relationship between the timing signal and the remaining digitally encoded signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for decoding information transmitted to a communication receiver, the information including a bit synchronization signal and message data having digitally encoded signals, the bit synchronization signal including a first digital synchronization portion and a second digital synchronization portion, the method comprising the steps of:
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(a) sampling the information at a first sampling rate for decoding the first digital synchronization portion and generating a first timing signal in response thereof; (b) sampling the second digital synchronization portion based upon the first timing signal for measuring a phase relationship between the first timing signal and the second digital synchronization portion; (c) adjusting the timing signal with the phase relationship for generating a second timing signal; and (d) sampling the information with the second timing signal for decoding the digitally encoded signals of the message data. - View Dependent Claims (14, 15, 16, 17)
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18. A method for decoding information transmitted to a communication receiver, the information being digitally encoded signals including a first bit synchronization signal, a second bit synchronization signal and message data, said method comprising the steps of:
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(a) sampling the information at a first sampling rate for decoding the first bit synchronization signal and generating a timing signal in response thereof; (b) sampling the second bit synchronization signal at a second sampling rate with the timing signal for measuring a phase relationship between the timing signal and the second bit synchronization signal; and (c) adjusting the timing signal for establishing a predetermined phase relationship between the timing signal and the message data. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An apparatus for decoding information transmitted to a communication receiver, the information having digitally encoded signals including a first bit synchronization signal and message data;
- the first bit synchronization signal including a first portion and a second portion;
said apparatus comprising;a clock signal circuit for generating a clocking signal; means for sampling, responsive to said clocking signal, to sample the information at a first sampling rate to decode the first bit synchronization portion to generate a timing signal synchronized to the first bit synchronization portion; means for measuring, to sample the second bit synchronization portion, for measuring a phase relationship between the timing signal and the second bit synchronization portion; and means for adjusting the timing signal for establishing a predetermined phase relationship between the timing signal and the message data. - View Dependent Claims (29, 30, 31)
- the first bit synchronization signal including a first portion and a second portion;
Specification