Combining pilot-symbol-based phase estimation with data-symbol-based phase estimation
First Claim
1. A method for a receiver to estimate phase of a carrier wave, comprising:
- receiving a carrier wave carrying pilot symbols and data symbols extending between the pilot symbols;
demodulating received pilot symbols, producing demodulated pilot symbols;
determining phase of the carrier wave at received pilot symbols based on a phase of the demodulated pilot symbols;
demodulating received data symbols, producing demodulated data symbols; and
interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on a phase of the demodulated data symbols,wherein;
(a) the interpolating comprises computing a phase trajectory function;
to approximately fit the phase trajectory function to the determined phase at the received pilot symbols; and
to approximately fit the estimated phases at the demodulated data symbols; and
(b) the computing the phase trajectory function further includes computing more than one phase trajectory function, and computing a linear combination of at least some of the more than one phase trajectory functions.
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Accused Products
Abstract
A method for a receiver to estimate phase of a carrier wave, including receiving a carrier wave carrying pilot symbols and data symbols extending between the pilot symbols, determining phase of the carrier wave at received pilot symbols, and interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on an estimated phase of demodulated data symbols. Apparatus for estimate phase of a carrier wave, including a unit for determining phase of the carrier wave at received pilot symbols, and a unit for interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on an estimated phase of demodulated data symbols. Related apparatus and methods are also described.
9 Citations
16 Claims
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1. A method for a receiver to estimate phase of a carrier wave, comprising:
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receiving a carrier wave carrying pilot symbols and data symbols extending between the pilot symbols; demodulating received pilot symbols, producing demodulated pilot symbols; determining phase of the carrier wave at received pilot symbols based on a phase of the demodulated pilot symbols; demodulating received data symbols, producing demodulated data symbols; and interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on a phase of the demodulated data symbols, wherein; (a) the interpolating comprises computing a phase trajectory function; to approximately fit the phase trajectory function to the determined phase at the received pilot symbols; and to approximately fit the estimated phases at the demodulated data symbols; and (b) the computing the phase trajectory function further includes computing more than one phase trajectory function, and computing a linear combination of at least some of the more than one phase trajectory functions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. Apparatus for estimating phase of a carrier wave, comprising:
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a unit for receiving a carrier wave carrying pilot symbols and data symbols extending between the pilot symbols; a unit for demodulating received pilot and data symbols, producing demodulated pilot symbols and demodulated data symbols; a unit for determining phase of the carrier wave at received pilot symbols based on a phase of the demodulated pilot symbols; and a unit for interpolating the phase of the carrier wave at points between pilot symbols based, at least in part, on an estimated phase of demodulated data symbols, wherein; (a) the unit for interpolating comprises computing a phase trajectory function; to approximately fit the phase trajectory function to the determined phase at the received pilot symbols; and to approximately fit the estimated phases at the demodulated data symbols, and (b) the computing further includes computing more than one phase trajectory function, and computing a linear combination of at least some of the more than one phase trajectory functions.
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Specification