Phase ambiguity removing device
First Claim
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1. A phase ambiguity removing device comprising:
- counting means for counting a number of error bits of received synchronizing words of two predetermined phases among four phases due to phase slip of a received QPSK signal;
first phase information controlling means for generating a first phase information indicative of the phases for which the received synchronizing words are detected on the basis of said number of error bits detected by said counting means;
second phase information controlling means for generating a second phase information indicative of the phases for which a probability of existence of said synchronizing word is high when the received synchronizing words cannot be detected on the basis of said number of error bits detected by said counting means;
selecting means for selecting a phase information from said first phase information controller when the received synchronizing words are detected or from said second phase information controller when the received synchronizing words cannot be detected; and
removing means for removing phase ambiguity from received signals on the basis of an output of said selecting means.
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Abstract
A phase ambiguity removing device for determining the proper phase of the Pch, Qch data demodulated by a receive side demodulator of a Quadrature Phase Shift Keying (QPSK) system includes a second phase information controller for determining the most probable phase of the received signals when detection of synchronizing words fail in the Pch and Qch signals.
9 Citations
6 Claims
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1. A phase ambiguity removing device comprising:
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counting means for counting a number of error bits of received synchronizing words of two predetermined phases among four phases due to phase slip of a received QPSK signal; first phase information controlling means for generating a first phase information indicative of the phases for which the received synchronizing words are detected on the basis of said number of error bits detected by said counting means; second phase information controlling means for generating a second phase information indicative of the phases for which a probability of existence of said synchronizing word is high when the received synchronizing words cannot be detected on the basis of said number of error bits detected by said counting means; selecting means for selecting a phase information from said first phase information controller when the received synchronizing words are detected or from said second phase information controller when the received synchronizing words cannot be detected; and removing means for removing phase ambiguity from received signals on the basis of an output of said selecting means. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling a phase ambiguity, the method comprising the steps of:
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(a) counting a number of error bits of synchronizing words of two predetermined phases among four phases due to a received QPSK signal; (b) generating a first phase information indicative of phases for which the received synchronizing word is detected on the basis of said number of error bits detected by said counting means; (c) generating a second phase information indicative of phases in which a probability of existence of said synchronizing word is high when the received synchronizing words cannot be detected on the basis of said number of error bits detected by said counting means; (d) selecting a phase information from said first phase information controller when the received synchronizing words are detected or from said second phase information controller when the received synchronizing words cannot be detected,. (e) removing phase ambiguity from received signals on the basis of said first and said second phase informations.
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Specification