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US 7,072,999 B1Granted
Robust packet arrival time detector using estimated signal power
Assignee2Wire, Inc.
InventorsPhilip DesJardins, Scott A. Lery, Carl Alelyunas
Life of this patent
Estimating the term…
Abstract
A robust packet arrival time detector using a power estimate to validate a packet arrival time measurement. A packet arrival time measurement is considered valid when the value of the power estimate signal indicates that a packet is being received. A power estimator comprises a bandpass filter, a Hilbert transform, two squaring devices, an adder, and a lowpass filter.
Claims30
A system for packet arrival time detection, comprising:
- a receiver configured to receive a signal;
- a packet arrival time detector, coupled to the receiver, configured to produce a packet arrival time output;
- and
- a power estimator, coupled to the receiver, configured to estimate the power in the received signal and provide the estimated power to the packet arrival time detector to validate the packet arrival time output.
1 more element
A method for packet arrival time detection, comprising the steps of:
- receiving a signal;
- processing the received signal to produce a packet arrival time output;
- processing the received signal to produce an estimated power;
- and
- validating the packet arrival time output using the estimated power.
2 more elements
A system for packet arrival detection, comprising:
- means for receiving a signal;
- means for processing the received signal to produce a packet arrival time output;
- means for processing the received signal to produce an estimated power;
- and
- means for validating the packet arrival time output using the estimated power.
2 more elements
A system for packet arrival time detection, comprising:
- a receiver configured to receive a signal;
- a packet arrival time detector, coupled to the receiver, configured to produce a packet arrival time output;
- a power estimator, coupled to the receiver, configured to determine an estimated power of the received signal and to provide the estimated power to the packet arrival time detector to validate the packet arrival time output, where the power estimator generates an analytic signal including a real component equal to the received signal and an imaginary component equal to a Hilbert transform of the received signal, and the power estimator squares the real and imaginary components of the analytic signal and adds together the squared real and imaginary components of the analytic signal to produce the estimated power.
Dependencies are inferred from the claim text.