Kalman Filter For Phase Noise Tracking
First Claim
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1. A phase noise estimation system for estimating phase noise in a received signal, the system comprising:
- a hard-decision decoder operable to receive a transmitted symbol and to generate a hard decision regarding the value of the transmitted symbol; and
a forward Kalman filter comprising;
a state transition module operable to generate a forward estimate of the phase noise present in the received signal at a time t based on a forward estimate of the phase noise present in the received signal at a prior time t−
1; and
a measurement module operable to update the forward estimate of the phase noise based on a value of the received symbol and the hard decision generated by the hard decision decoder.
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Abstract
A forward-backward Kalman filter for estimating phase noise present in a received signal. Both the forward and backward Kalman filters use hard-decision measurements of the received symbols. The phase noise estimate from the forward Kalman filter is used as a coarse phase noise estimate for the backward Kalman filter and vice versa. The final phase noise estimate is an optimal combination of the forward phase noise estimate and backward phase noise estimate.
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Citations
27 Claims
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1. A phase noise estimation system for estimating phase noise in a received signal, the system comprising:
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a hard-decision decoder operable to receive a transmitted symbol and to generate a hard decision regarding the value of the transmitted symbol; and a forward Kalman filter comprising; a state transition module operable to generate a forward estimate of the phase noise present in the received signal at a time t based on a forward estimate of the phase noise present in the received signal at a prior time t−
1; anda measurement module operable to update the forward estimate of the phase noise based on a value of the received symbol and the hard decision generated by the hard decision decoder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of estimating the phase noise present in a received signal, comprising:
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receiving a transmitted signal; generating a hard decision regarding a transmitted value of a symbol in the received signal; generating a forward estimate of the phase noise present in the received signal at a time t based on a forward estimate of the phase noise present in the received signal at a prior time t−
1; andupdating the forward estimate of the phase noise based on a value of the received symbol and the hard decision. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification