Measurement of time of arrival
First Claim
1. A method of measuring time of arrival of a signal transmitted from a transmitter to a receiver over a channel, said method comprising:
- modulating a plurality of narrowband signal portions onto different carrier frequencies;
transmitting, by said transmitter, each said modulated narrowband signal portion to said receiver, each of said modulated narrowband signal portions being transmitted separately over time and over a respective one of said different carrier frequencies;
receiving, by said receiver, the narrowband signal portions over said different carrier frequencies;
estimating an impulse response of the channel by combining the received narrowband signal portions; and
measuring the time of arrival using the estimated channel impulse response.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a method of measuring time of arrival of a signal transmitted from a transmitter (120) to a receiver (110-n). The method comprises: modulating a plurality of narrowband signal portions onto different carrier frequencies; transmitting, by the transmitter, each modulated signal portion to the receiver; receiving, by the receiver, the transmitted signal portions; estimating the channel impulse response by combining (610) the received signal portions; and measuring (620) the time of arrival using the estimated channel impulse response. Further disclosed is a method of measuring a time of arrival of a signal transmitted from a transmitter to a receiver. The method comprises: estimating a noise level (1310) in an impulse response of a channel between the transmitter and the receiver; finding a first peak (1330) in the channel impulse response that is not noise or a side lobe of a subsequent peak, using the estimated noise level; and measuring the time of arrival (1220) using the first peak.
58 Citations
20 Claims
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1. A method of measuring time of arrival of a signal transmitted from a transmitter to a receiver over a channel, said method comprising:
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modulating a plurality of narrowband signal portions onto different carrier frequencies; transmitting, by said transmitter, each said modulated narrowband signal portion to said receiver, each of said modulated narrowband signal portions being transmitted separately over time and over a respective one of said different carrier frequencies; receiving, by said receiver, the narrowband signal portions over said different carrier frequencies; estimating an impulse response of the channel by combining the received narrowband signal portions; and measuring the time of arrival using the estimated channel impulse response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17)
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11. A method of measuring a time of arrival of a signal transmitted from a transmitter to a receiver, said method comprising:
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estimating a noise level in an impulse response of a channel between said transmitter and said receiver; finding a first peak in the channel impulse response that is not noise or a side lobe of a subsequent peak, using said estimated noise level; and measuring the time of arrival using said first peak; wherein the measuring comprises; extracting a predetermined number of samples on a leading edge of said first peak; looking up a database of stored time of arrival offset values using said extracted leading edge samples; and obtaining the time of arrival from said database lookup. - View Dependent Claims (12, 13, 14, 15, 16)
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18. A method of measuring time of arrival of a signal transmitted from a transmitter to a receiver over a channel, said method comprising:
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receiving, by said receiver, a plurality of narrowband signal portions over different carrier frequencies, each narrowband signal portion having been modulated onto a respective one of said different carrier frequencies, each of said modulated narrowband signal portions having been transmitted separately over time by said transmitter; estimating an impulse response of the channel by combining the received narrowband signal portions; and measuring the time of arrival using the estimated channel impulse response.
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19. A system adapted to measure time of arrival, the system comprising:
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a transmitter adapted to; modulate a plurality of narrowband signal portions onto different carrier frequencies; and transmit each said modulated signal portion to said receiver over a channel, each of said modulated narrowband signal portions being transmitted separately over time and over a respective one of said different carrier frequencies; and a receiver adapted to; receive the narrowband signal portions over said different carrier frequencies; estimate an impulse response of the channel by combining the received narrowband signal portions; and measure the time of arrival using the estimated channel impulse response.
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20. A receiver adapted to measure time of arrival of a signal transmitted from a transmitter to a receiver over a channel, the receiver being adapted to:
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receive a plurality of narrowband signal portions over different carrier frequencies, each narrowband signal portion having been modulated onto a respective one of said different carrier frequencies, each of said modulated narrowband signal portions having been transmitted separately over time by said transmitter; estimate an impulse response of the channel by combining the received narrowband signal portions; and measure the time of arrival using the estimated channel impulse response.
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Specification