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US 9,001,905 B2Granted
Distance estimation
AssigneeNokia Corporation
InventorsAri Henrik Hamalainen, Ilari Aleksi Teikari
Life of this patent
Estimating the term…
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.
Claims17
A method, comprising:
- transforming an orthogonal frequency division multiplexed signal, received at a receiver, in order to determine data from sub-carriers of the received orthogonal frequency division multiplexed signal, wherein the orthogonal frequency division multiplexed signal comprises phase shift keying symbols;
- comparing data determined from a first sub-carrier of the orthogonal frequency division multiplexed signal with first reference data to determine a first phase difference between a phase of the first sub-carrier when transmitted and a phase of the first sub-carrier when received;
- comparing data determined from a second sub-carrier of the orthogonal frequency division multiplexed signal with second reference data to determine a second phase difference between a phase of the second sub-carrier when transmitted and a phase of the second sub-carrier when received;
- and
- using the determined first phase difference and the determined second phase difference to determine an average distance between the receiver and an origin of the orthogonal frequency division multiplexed signal,
- wherein the average distance is an average of a first distance for the first sub-carrier of the orthogonal frequency division multiplexed signal and a second distance for the second sub-carrier of the orthogonal frequency division multiplexed signal.
3 more elements
An apparatus, comprising:
- transformation circuitry configured to transform an orthogonal frequency division multiplexed signal, received at a receiver, in order to determine data from sub-carriers of the received orthogonal frequency division multiplexed signal, wherein the orthogonal frequency division multiplexed signal comprises phase shift keying symbols;
- a comparator configured to compare the data determined from a first sub-carrier of the orthogonal frequency division multiplexed signal with first reference data to determine a first phase difference between a phase of the first sub-carrier when transmitted and a phase of the first sub-carrier when received, and configured to compare the data determined from a second sub-carrier of the orthogonal frequency division multiplexed signal with second reference data to determine a second phase difference between a phase of the second sub-carrier when transmitted and a phase of the second sub-carrier when received;
- and
- estimation circuitry configured to use the determined first phase difference and the determined second phase difference to determine an average distance between the apparatus and an origin of the orthogonal frequency division multiplexed signal,
- wherein the average distance is an average of a first distance for the first sub-carrier of the orthogonal frequency division multiplexed signal and a second distance for the second sub-carrier of the orthogonal frequency division multiplexed signal.
2 more elements
A non-transitory 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:
- transforming an orthogonal frequency division multiplexed signal, received at a receiver, in order to determine data from the sub carriers of the received orthogonal frequency division multiplexed signal, wherein the orthogonal frequency division multiplexed signal comprises phase shift keying symbols;
- comparing the data determined from a first sub-carrier of the orthogonal frequency division multiplexed signal with first reference data to determine a first phase difference between a phase of the first sub-carrier when transmitted and a phase of the first sub-carrier when received;
- comparing the data determined from a second sub-carrier of the orthogonal frequency division multiplexed signal with second reference data to determine a second phase difference between a phase of the second sub-carrier when transmitted and a phase of the second sub-carrier when received;
- and
- using the determined first phase difference and the determined second phase difference to determine an average distance between the receiver and an origin of the orthogonal frequency division multiplexed signal,
- wherein the average distance is an average of a first distance for the first sub-carrier of the orthogonal frequency division multiplexed signal and a second distance for the second sub-carrier of the orthogonal frequency division multiplexed signal.
3 more elements
Dependencies are inferred from the claim text.