Carrier to noise ratio estimations from a received signal
First Claim
Patent Images
1. A method for measuring a carrier to noise ratio in a received signal, comprising:
- receiving a phase-shift keyed signal;
processing the phase-shift keyed signal through a carrier recovery loop to produce signal points relative to ideal signal nodes; and
determining a carrier to noise ratio (CNR) measurement from the average difference between the signal points and respective ideal signal nodes.
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Abstract
Techniques for measuring the carrier to noise ratio (CNR) in a received digital signal are disclosed. The methods can operate on a received digital signal, such as a layered modulation signal used in a satellite television system. The CNR measurement can be made at the output of a carrier recovery loop or a timing recovery loop in a demodulator. Alternately, the CNR measurement can be made when the received signal is digitized in an analog to digital (A/D) converter at base-band by the demodulator.
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Citations
30 Claims
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1. A method for measuring a carrier to noise ratio in a received signal, comprising:
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receiving a phase-shift keyed signal;
processing the phase-shift keyed signal through a carrier recovery loop to produce signal points relative to ideal signal nodes; and
determining a carrier to noise ratio (CNR) measurement from the average difference between the signal points and respective ideal signal nodes. - View Dependent Claims (2, 3, 4, 5)
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6. A method for measuring a carrier to noise ratio in a received signal, comprising:
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receiving a phase-shift keyed signal;
sampling the phase-shift keyed signal at tracked peak symbol times to determine signal point magnitudes; and
determining a carrier to noise ratio (CNR) measurement from the average difference between an average value of the signal point magnitudes and the signal point magnitudes. - View Dependent Claims (7, 8, 9, 10)
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11. A method for measuring a carrier to noise ratio in a received signal, comprising:
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receiving a phase-shift keyed signal;
digitizing the phase-shift keyed signal at base-band to determine digitized signal values; and
determining a carrier to noise ratio (CNR) measurement from the signal raised to its N-th power by comparing the power ratio between the DC and AC components of the powered signals. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus for measuring a carrier to noise ratio in a received signal, comprising:
a demodulator for receiving a phase-shift keyed signal, for processing the phase-shift keyed signal through a carrier recovery loop to produce signal points relative to ideal signal nodes, and for determining a carrier to noise ratio (CNR) measurement from the average difference between the signal points and respective ideal signal nodes. - View Dependent Claims (17, 18, 19, 20)
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21. An apparatus for measuring a carrier to noise ratio in a received signal, comprising:
a demodulator for receiving a phase-shift keyed signal, for sampling the phase-shift keyed signal at tracked peak symbol times to determine signal point magnitudes, and for determining a carrier to noise ratio (CNR) measurement from the average difference between an average value of the signal point magnitudes and the signal point magnitudes. - View Dependent Claims (22, 23, 24, 25)
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26. An apparatus for measuring a carrier to noise ratio in a received signal, comprising:
a demodulator for receiving a phase-shift keyed signal, for digitizing the phase-shift keyed signal at base-band to determine digitized signal values, and for determining a carrier to noise ratio (CNR) measurement from the signal raised to its N-th power by comparing the power ratio between the DC and AC components of the powered signals. - View Dependent Claims (27, 28, 29, 30)
Specification