Kalman filter for phase noise tracking
First Claim
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1. A method, comprising:
- receiving, with a receiver, a signal;
applying a backward phase noise correction estimate to the signal to produce a first intermediate signal;
generating, with the receiver, a first decision regarding a transmitted value of a symbol in the first intermediate signal, wherein the first decision has a first variance between the transmitted value and the first intermediate signal;
generating, with the receiver, a first forward phase noise correction estimate for the signal at a time t based on a second forward phase noise correction estimate for the signal at a prior time t−
1 and the first variance; and
updating, with the receiver, the backward phase noise correction estimate based on the first forward phase noise correction estimate, and the first decision regarding the transmitted value of the symbol to reduce the first variance.
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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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13 Claims
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1. A method, comprising:
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receiving, with a receiver, a signal; applying a backward phase noise correction estimate to the signal to produce a first intermediate signal; generating, with the receiver, a first decision regarding a transmitted value of a symbol in the first intermediate signal, wherein the first decision has a first variance between the transmitted value and the first intermediate signal; generating, with the receiver, a first forward phase noise correction estimate for the signal at a time t based on a second forward phase noise correction estimate for the signal at a prior time t−
1 and the first variance; andupdating, with the receiver, the backward phase noise correction estimate based on the first forward phase noise correction estimate, and the first decision regarding the transmitted value of the symbol to reduce the first variance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification