ESTIMATION OF TIME DIFFERENCE OF ARRIVAL (TDOA) IN MULTIPATH ENVIRONMENTS BASED ON SUB-NYQUIST RATE SAMPLING
First Claim
1. A method for estimating time difference of arrival (TDOA) between first and second multipath signals, where each of the first and second signals represents a multipath channel, the comprising:
- sampling the first signal at a sub-Nyquist rate to provide a first sampled signal;
sampling the second signal at the sub-Nyquist rate to provide a second sampled signal;
cross-correlating the first and second sampled signals; and
determining an estimate of the TDOA between the first and second signals based on the cross-correlated first and second sampled signals.
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Abstract
A method is provided for to determining a time difference of arrival (TDOA) between a first signal and a second signal. The method includes sampling a first signal at a sub-Nyquist rate to provide a first sampled signal; sampling a second signal at the sub-Nyquist rate to provide a second sampled signal, the first and second signals representing corresponding multipath channels; cross-correlating the first and second sampled signals; and determining an estimate of the TDOA between the first and second signals based on the sampled first and second signals.
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Citations
20 Claims
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1. A method for estimating time difference of arrival (TDOA) between first and second multipath signals, where each of the first and second signals represents a multipath channel, the comprising:
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sampling the first signal at a sub-Nyquist rate to provide a first sampled signal; sampling the second signal at the sub-Nyquist rate to provide a second sampled signal;
cross-correlating the first and second sampled signals; anddetermining an estimate of the TDOA between the first and second signals based on the cross-correlated first and second sampled signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, instantiated in a computer readable medium storing programming instructions and executable by a processor, to determine time difference of arrival (TDOA) between a first signal and a second signal, the method comprising:
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sampling a first signal at a sub-Nyquist rate to provide a first sampled signal; sampling a second signal at the sub-Nyquist rate to provide a second sampled signal, the first and second signals representing corresponding multipath channels of an input signal from a transmitter; cross-correlating the first and second sampled signals; and determining an estimate of the TDOA between the first signal and the second signal based on the cross-correlated first and second sampled signals. - View Dependent Claims (10, 11, 12)
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13. An apparatus, comprising:
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a first device configured to sample a first signal from a first sensor at a sub-Nyquist rate to provide a first sampled signal; a second device configured to sample a second signal from a second sensor at the sub-Nyquist rate to provide a second sampled signal; and a module configured to cross-correlate the first and second sampled signals and to provide estimates of time difference of arrival (TDOA) between the first and second signals corresponding to a sampling period based on the cross-correlated first and second sampled signals, wherein the first and second signals correspond to an input signal from a transmitter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification