Signal delay estimator with absolute delay amount and direction estimation
First Claim
1. A signal delay estimator, comprising:
- an adjustable delay element for delaying a first signal to obtain a delayed first signal;
a delay amount estimator configured to estimate a delay amount between the delayed first signal and a second signal that is similar and delayed relative to the first signal;
a leading signal determiner configured to determine whether the delayed first signal leads the second signal or vice versa, and generate a corresponding indication signal based thereon; and
a feedback element to the adjustable delay element configured to control a delay of the adjustable delay element based on the delay amount and the indication signal.
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Accused Products
Abstract
A signal delay estimator includes an adjustable delay element for delaying a first signal to obtain a delayed first signal, a delay amount estimator for estimating a delay amount between the delayed first signal and a second signal that is similar and delayed relative to the first signal, and a leading signal determiner for determining whether the delayed first signal leads the second signal or vice versa, and for generating a corresponding binary signal. A selective inverter is provided for selectively inverting the delay amount depending on the binary signal. The signal delay estimator also includes a feedback element to the adjustable delay element for controlling a delay based on an output of the selective inverter. Another exemplary signal delay estimator includes a closed control loop with an adjustable delay element and separate first and second processing paths for absolute delay amount and delay direction, respectively.
15 Citations
22 Claims
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1. A signal delay estimator, comprising:
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an adjustable delay element for delaying a first signal to obtain a delayed first signal; a delay amount estimator configured to estimate a delay amount between the delayed first signal and a second signal that is similar and delayed relative to the first signal; a leading signal determiner configured to determine whether the delayed first signal leads the second signal or vice versa, and generate a corresponding indication signal based thereon; and a feedback element to the adjustable delay element configured to control a delay of the adjustable delay element based on the delay amount and the indication signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile communication device, comprising:
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an antenna port; a digital baseband processor; an analog-frontend coupled to the antenna port and to the digital baseband processor; and a signal delay estimator associated with the digital baseband processor and the analog-frontend, comprising; an adjustable delay element configured to delay a first signal to obtain a delayed first signal; a delay amount estimator configured to estimate a delay amount between the delayed first signal and a second signal that is similar and delayed relative to the first signal; a leading signal determiner configured to determine whether the delayed first signal leads the second signal or vice versa, and generate a corresponding indication signal; and a feedback element to the adjustable delay element configured to control a delay based on the delay amount and the indication signal. - View Dependent Claims (12)
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13. A method for estimating a delay between a first signal and a similar second signal, the method comprising:
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delaying the first signal by an adjustable delay to obtain a delayed first signal; estimating a delay amount between the delayed first signal and the second signal; determining whether the delayed first signal leads the second signal or vice versa and generating a corresponding indication signal based thereon; and adjusting the adjustable delay used for delaying the first signal based on the estimated delay amount and the indication signal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A transmitter path, comprising:
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an analog signal generator configured to receive an input transmit signal; an amplifier coupled to an output of the analog signal generator and configured to generate an output transmit signal; a delay tracking loop configured to estimate a delay between the input transmit signal and the output transmit signal; an evaluation circuit configured to output an adjustment signal to adjust one or more parameters of the analog signal generator or the amplifier based on a comparison of the input transmit signal and the output transmit signal according to the estimated delay. - View Dependent Claims (20, 21, 22)
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Specification