Fine synchronization of a signal in the presence of time shift caused by doppler estimation error
First Claim
1. A radio frequency receiver, comprising:
- a receiving circuit for receiving and decoding an incoming radio frequency signal including a correlation signal;
a timing estimation circuit, the timing circuit comprising;
a signal buffer receiving a plurality of correlation signal segments;
a first peak detection and Doppler estimation circuit for determining a first timing of a first segment and the associated first Doppler shift;
a memory coupled to the signal buffer, the memory receiving a plurality of segment correlation metrics;
a second peak detection and Doppler estimation circuit for determining a second timing of a second segment and the associated second Doppler shift; and
a final correlation circuit for determining a final timing estimate based on the first Doppler shift, the second Doppler shift, and the first timing estimate and based on the correlation metrics of at least some of the plurality of correlation segments.
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Accused Products
Abstract
A radio frequency receiver includes a receiving circuit for receiving and decoding an incoming radio frequency signal including a correlation signal. The receiver also includes a timing estimation circuit. The timing estimation circuit comprises a signal buffer receiving a plurality of correlation signal segments, and a first peak detection and Doppler estimation circuit for determining a first timing of a first segment and the associated first Doppler shift. The timing estimation circuit also comprises a memory coupled to the signal buffer, the memory receiving a plurality of segment correlation metrics, and a second peak detection and Doppler estimation circuit for determining a second timing of a second segment and the associated second Doppler shift. Further included in the timing circuit is a final correlation circuit for determining a final timing estimate based on the first Doppler shift, the second Doppler shift, and the first timing estimate and based on the correlation metrics of at least some of the plurality of correlation segments.
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Citations
21 Claims
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1. A radio frequency receiver, comprising:
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a receiving circuit for receiving and decoding an incoming radio frequency signal including a correlation signal; a timing estimation circuit, the timing circuit comprising; a signal buffer receiving a plurality of correlation signal segments; a first peak detection and Doppler estimation circuit for determining a first timing of a first segment and the associated first Doppler shift; a memory coupled to the signal buffer, the memory receiving a plurality of segment correlation metrics; a second peak detection and Doppler estimation circuit for determining a second timing of a second segment and the associated second Doppler shift; and a final correlation circuit for determining a final timing estimate based on the first Doppler shift, the second Doppler shift, and the first timing estimate and based on the correlation metrics of at least some of the plurality of correlation segments. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining a timing estimate and Doppler shift estimate for a received radio frequency signal, comprising:
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receiving and decoding an incoming radio frequency signal including a correlation signal; segmenting the correlation signal into segments in a signal buffer; determining a first timing of a first segment and the associated first Doppler shift by a first peak detection and Doppler estimation circuit; determining a plurality of correlation metrics based on the first timing estimate and the first Doppler shift; storing the plurality of correlation metrics in a memory; determining a second timing of a second segment segment and the associated second Doppler shift by a second peak detection and Doppler estimation circuit; and determining a final timing estimate based on the first Doppler shift, the second Doppler shift, and the first timing estimate by a final correlation circuit and based on at least some of the plurality of correlation segments. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for determining a timing estimate and Doppler shift estimate for a received radio frequency signal, comprising:
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a means for receiving and decoding an incoming radio frequency signal including a correlation signal; a means for segmenting the correlation signal into segments in a signal buffer; a means for determining a first timing of a first segment and the associated first Doppler shift by a first peak detection and Doppler estimation circuit; a means for determining a plurality of correlation metrics based on the first timing estimate and the first Doppler shift a means for storing the plurality of correlation metrics in a memory; a means for determining a second timing of a second segment and the associated second Doppler shift by a second peak detection and Doppler estimation circuit; and a means for determining a final timing estimate based on the first Doppler shift, the second Doppler shift, and the first timing estimate by a final correlation circuit and based on at least some of the plurality of correlation segments. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification