Method for improved line-of-sight signal detection using RF model parameters
First Claim
1. A method comprising the step of:
- adjusting an identified time-of-arrival of a first-arriving multipath component of an incoming signal by an amount based on at least one parameter of an RF model that characterizes the scattering hostility of the RF environment in which said incoming signal traveled;
said adjustment thereby reducing a time-shift of said identified time of arrival due to a blocked line-of-sight path in said RF environment in which said incoming signal traveled.
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Abstract
The invention provides a method for “adjusting” an identified or measured time-of-arrival of the first-arriving component of an incoming to more accurately reflect the time-of-arrival of the line-of-sight component of the incoming signal by reducing the so-called time-shift due to multipathing. In accordance with the principles of the present invention, the adjustment to the identified time-of-arrival of the first-arriving component is based on at least one parameter of an RF model that characterizes the scattering hostility of the RF environment in which the incoming signal traveled. The resultant adjusted time-of-arrival reflects the time at which the line-of-sight component of the incoming signal would have arrived if the RF environment were scatter-free.
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Citations
12 Claims
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1. A method comprising the step of:
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adjusting an identified time-of-arrival of a first-arriving multipath component of an incoming signal by an amount based on at least one parameter of an RF model that characterizes the scattering hostility of the RF environment in which said incoming signal traveled;
said adjustment thereby reducing a time-shift of said identified time of arrival due to a blocked line-of-sight path in said RF environment in which said incoming signal traveled. - View Dependent Claims (2, 3, 4)
obtaining a basis parameter that characterizes the scattering hostility of a given region of the RF environment, said basis parameter having an associated basis time-shift that is a measure of the time between the time-of-arrival of the first-arriving component of a given incoming signal and an expected time-of-arrival of the line-of-sight component of the given signal, if the given region in which the given signal traveled was scatter-free; and
adjusting the basis time-shift by an amount based on the difference between the value of said basis parameter and said at least one parameter to obtain said time-shift of the first-arriving component of said incoming signal.
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5. A method, comprising:
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receiving an incoming signal from a region of an RF environment;
identifying a time-of-arrival of a first-arriving multipath component of the incoming signal;
obtaining a parameter that characterizes a scattering hostility of the region of the RF environment; and
adjusting the identified time-of-arrival of the first-arriving multipath component by an amount based on the parameter. - View Dependent Claims (6, 7, 8, 9, 10)
obtaining a basis parameter for the region of the RF environment, the basis parameter having a known basis time-shift;
calculating a difference between the parameter and the basis parameter; and
obtaining a time-shift of the first-arriving component from the difference and the known basis time-shift.
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10. The method of claim 9, wherein the step of adjusting includes adjusting the identified time-of-arrival of the first-arriving component based on the obtained time-shift of the first-arriving component.
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11. An apparatus to adjust an identified time-of-arrival of a first-arriving component of an incoming signal from a region of an RF environment, comprising:
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a processor having first and second inputs and an output, the first input being connected to a signal indicating the identified time-of-arrival of the first-arriving component of the incoming signal; and
a device connected to the second input and including a set of parameters characterizing a scattering hostility of different regions of the RF environment wherein the processor adjusts the identified time-of-arrival of the first-arriving multipath component by an amount based on at least one of the set of parameters. - View Dependent Claims (12)
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Specification