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US 8,798,125 B2Granted
Phase tracking in communications systems
AssigneeBroadcom Corporation
InventorsTommy Yu, Amy Gayle Hundhausen
Life of this patent
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Abstract
The present invention includes a method of determining a phase estimate for an input signal having pilot symbols. The method includes receiving a plurality of pilot symbols, and then multiplying two or more pilot symbol slots by corresponding correlator coefficients to correct a phase estimate of the input signal.
Claims20
A method comprising:
- receiving a first set of pilot symbols and a second set of pilot symbols in a data stream, wherein the data stream comprises data symbols positioned between the first set of pilot symbols and the second set of pilot symbols, and wherein the first set of pilot symbols and the second set of pilot symbols each comprise one or more pilot symbols;
- generating a first phase estimate and a second phase estimate based on the first set of pilot symbols and the second set of pilot symbols respectively;
- determining a phase difference between the second phase estimate and the first phase estimate;
- and
- correcting phases associated with the data symbols in the data stream based on the phase difference, wherein correcting phases associated with the data symbols includes:
- generating a phase ramp signal representative of respective beginning and ending points associated with the first set of pilot symbols and the second set of pilot symbols;
- converting the phase ramp signal to a complex sinusoidal value;
- and
- multiplying the complex sinusoidal value with the data symbols to correct phases of the data symbols,
- wherein the receiving, generating, determining and correcting are performed by one or more circuits.
7 more elements
A method comprising:
- receiving first set of pilot symbols and a second set of pilot symbols in a data stream, wherein the data stream comprises data symbols positioned between the first set of pilot symbols and the second set of pilot symbols, and wherein the first set of pilot symbols and the second set of pilot symbols each comprise one or more pilot symbols;
- generating a first phase estimate and a second phase estimate based on the first set of pilot symbols and the second set of pilot symbols respectively, where generating the first phase estimate and the second phase estimate includes being triggered based on sensing a presence of the first set of pilot symbols and the second set of pilot symbols respectively;
- determining a phase difference between the second phase estimate and the first phase estimate;
- and
- correcting phases associated with the data symbols in the data stream based on the phase difference,
- wherein the receiving, generating, determining and correcting are performed by one or more circuits.
3 more elements
A system comprising:
- one or more circuits configured to:
- receive a first set of pilot symbols and a second set of pilot symbols in a data stream, wherein the data stream comprises data symbols positioned between the first set of pilot symbols and the second set of pilot symbols, and wherein the first set of pilot symbols and the second set of pilot symbols each comprise one or more pilot symbols;
- generate a first phase estimate and a second phase estimate based on the first set of pilot symbols and the second set of pilot symbols respectively;
- determine a phase difference between the second phase estimate and the first phase estimate;
- and
- correct phases associated with the data symbols in the data stream based on the phase difference, wherein the one or more circuits are further configured to correct phases associated with the data symbols by:
- generating a phase ramp signal representative of respective beginning and ending points associated with the first set of pilot symbols and the second set of pilot symbols;
- converting the phase ramp signal to a complex sinusoidal value;
- and
- multiplying the complex sinusoidal value with the data symbols to correct the phases associated with the data symbols.
7 more elements
A system comprising:
- one or more circuits configured to:
- receive a first set of pilot symbols and a second set of pilot symbols in a data stream, wherein the data stream comprises data symbols positioned between the first set of pilot symbols and the second set of pilot symbols, and wherein the first set of pilot symbols and the second set of pilot symbols each comprise one or more pilot symbols;
- generate a first phase estimate and a second phase estimate based on the first set of pilot symbols and the second set of pilot symbols respectively;
- determine a phase difference between the second phase estimate and the first phase estimate;
- and
- correct phases associated with the data symbols in the data stream based on the phase difference,
- wherein the one or more circuits are further configured to generate the first phase estimate and the second phase estimate by being triggered based on sensing a presence of the first set of pilot symbols and the second set of pilot symbols respectively.
4 more elements
Dependencies are inferred from the claim text.