System and method for determining absolute phase of a differentially-encoded, phase-modulated signal
First Claim
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1. A method for determining an absolute phase value of at least one symbol of a differentially-encoded, phase-modulated signal comprised of sequences of symbols transmitted to a receiver, said method comprising the steps of:
- storing values, to form thereby a stored set of values, representative of absolute phase values of a predetermined sequence of symbols of a portion of a desired, phase-modulated signal;
comparing the values of the stored set of values representative of the absolute phase values of the predetermined sequence of symbols with a sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver, thereby forming a comparison value comprised of at least one component portion wherein said comparison value is indicative of differences between the values of the stored set of values and the sequence of symbols transmitted to the receiver associated therewith;
determining an absolute phase value of the at least one symbol of the sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver responsive to values of said at least one component portion of the comparison value formed during said step of comparing.
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Abstract
System and method for determining an absolute phase value of a differentially-encoded, DQPSK signal. A stored set of sequences of an ID sequence is compared with a received ID-sequence of a differentially-encoded, DQPSK signal transmitted to the receiver. The stored and the received ID sequences are correlated, and the stored values of the ID sequence are adjusted by the value of the calculated correlation.
34 Citations
30 Claims
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1. A method for determining an absolute phase value of at least one symbol of a differentially-encoded, phase-modulated signal comprised of sequences of symbols transmitted to a receiver, said method comprising the steps of:
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storing values, to form thereby a stored set of values, representative of absolute phase values of a predetermined sequence of symbols of a portion of a desired, phase-modulated signal; comparing the values of the stored set of values representative of the absolute phase values of the predetermined sequence of symbols with a sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver, thereby forming a comparison value comprised of at least one component portion wherein said comparison value is indicative of differences between the values of the stored set of values and the sequence of symbols transmitted to the receiver associated therewith; determining an absolute phase value of the at least one symbol of the sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver responsive to values of said at least one component portion of the comparison value formed during said step of comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for determining an absolute phase value of at least one symbol of a differentially-encoded, phase-modulated signal comprised of sequences of symbols transmitted to a receiver, said system comprising:
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means for storing values, to form thereby a stored set of values, representative of absolute phase values of the predetermined sequence of symbols of a portion of a desired, phase-modulated signal; means for comparing the values of the stored set of values representative of the absolute phase values of the predetermined sequence of symbols with a sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver, thereby forming a comparison value comprised of at least one component portion wherein said comparison value is indicative of differences between the values of the stored set of values and the sequence of symbols transmitted to the receiver associated therewith; and means for determing an absolute phase value of the at least one symbol of the sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver responsive to values of said at least one component portion of the comparison value determined during said means for comparing. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. In a radio receiver having receiver circuitry operative to receive a sequence of symbols forming a portion of a differentially-encoded, phase-modulated signal transmitted thereto, the combination with the radio receive of:
- a system for determining an absolute phase value of at least one symbol of a differentially-encoded, phase-modulated signal comprised of sequences of symbols transmitted to the receiver, wherein said system comprises;
means for storing values, to form thereby a stored set of values, representative of absolute phase values of a predetermined sequence of symbols of a portion of a desired, phase-modulated signal; means for comparing the values of the stored set of values representative of the absolute phase values of the predetermined sequence of symbols with a sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver, thereby forming a comparison value having a phase angle indicative of phase differences between the values of the stored set of values and the sequence of symbols transmitted to the receiver associated therewith; means for quantizing the phase angle associated with the comparison value to form a quantized phase value thereby; and means for calculating an absolute phase value of the at least one symbol of the sequence of symbols of the differentially-encoded, phase-modulated signal transmitted to the receiver responsive to a value of the quantized phase value quantized by said means for quantizing.
- a system for determining an absolute phase value of at least one symbol of a differentially-encoded, phase-modulated signal comprised of sequences of symbols transmitted to the receiver, wherein said system comprises;
Specification