DISTANCE ESTIMATION
First Claim
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1. A method, comprising:
- enabling reception of an orthogonal frequency division multiplexed signal at a receiver, every first time, the orthogonal frequency division multiplexed signal comprising a plurality of sub-carriers;
transforming a received orthogonal frequency division multiplexed signal in order to determine data from the sub-carriers of the received orthogonal frequency divisional multiplexed signal;
comparing the data determined from the sub-carriers with reference data; and
using the difference between the data determined from the sub-carriers and the reference data to estimate a correction to a multiple of the first time in order to determine a distance between the receiver and an origin of the orthogonal frequency division multiplexed signal.
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Abstract
A method, comprising: periodically enabling reception of a signal at a receiver, every first time; transforming the received signal in order to determine data in the received signal; comparing the determined data with reference data; and using the difference between the determined data and the reference data to estimate a correction to a multiple of the first time in order to determine a distance between the receiver and an origin of the signal.
40 Citations
28 Claims
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1. A method, comprising:
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enabling reception of an orthogonal frequency division multiplexed signal at a receiver, every first time, the orthogonal frequency division multiplexed signal comprising a plurality of sub-carriers; transforming a received orthogonal frequency division multiplexed signal in order to determine data from the sub-carriers of the received orthogonal frequency divisional multiplexed signal; comparing the data determined from the sub-carriers with reference data; and using the difference between the data determined from the sub-carriers and the reference data to estimate a correction to a multiple of the first time in order to determine a distance between the receiver and an origin of the orthogonal frequency division multiplexed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus, comprising:
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transformation circuitry configured to transform a received orthogonal frequency division multiplexed signal comprising a plurality of sub-carriers, in order to determine data from the sub-carriers of the received orthogonal frequency division multiplexed signal;
the orthogonal frequency divisional multiplexed signal being received periodically every first time;a comparator configured to compare the data determined from the sub-carriers with reference data; and estimation circuitry configured to use the difference between the data determined from the sub-carriers and the reference data to estimate a correction to a multiple of the first time, in order to determine a distance between the receiver and an origin of the orthogonal frequency division multiplexed signal. - View Dependent Claims (11, 12, 13, 14, 15, 28)
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16. (canceled)
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17. (canceled)
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18. (canceled)
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19. (canceled)
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20. (canceled)
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21. (canceled)
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22. A computer-readable storage medium storing a computer program comprising computer program instructions that, when executed by at least one processor, cause an apparatus to perform at least the following:
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for transforming a received orthogonal frequency division multiplexed signal comprising a plurality of sub-carriers, to determine data in a received orthogonal frequency division multiplexed signal, wherein the orthogonal frequency division multiplexed signal is received periodically every first time; comparing the data determined from the sub-carriers with reference data; and using the difference between the data determined from the sub-carriers and the reference data to estimate a correction to a multiple of the first time, in order to determine a distance between the receiver and an origin of the orthogonal frequency division multiplexed signal. - View Dependent Claims (23, 24, 25)
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26. (canceled)
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27. (canceled)
Specification