RADIO CHANNEL ANALYZER TO DETERMINE DOPPLER SHIFTS ACROSS MULTIPLE FREQUENCIES OF A WIDEBAND SIGNAL
First Claim
1. A method implemented in a wireless device of analyzing multi-path signals received over a wireless communication channel to characterize scattering objects in the wireless communication channel, the method comprising:
- receiving a reference value for each of a plurality of frequencies within a signal bandwidth at a plurality of different signal times;
processing said reference values or complex propagation channel coefficients estimated therefrom to determine one of;
a set of Doppler shifts of scattered wave energy and a corresponding set of complex wave amplitudes for each of multiple frequencies within the signal bandwidth, each Doppler shift corresponding to a different angle of arrival; and
a set of path delays and a corresponding set of complex wave amplitudes for each of multiple signal times within an analysis interval; and
processing said complex wave amplitudes to determine;
a set of path delays corresponding to each angle of arrival or a set of angles of arrival corresponding to each determined path delay; and
a complex scattering coefficient for each combination of path delay and angle of arrival, wherein each complex scattering coefficient corresponds to a respective scattering object in the wireless communication channel.
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Abstract
A receiver and receive processing method described herein improves the accuracy of channel estimates by correcting for the assumption that the Doppler shift (or rate-of-change-of-delay) stays constant for each frequency within a signal bandwidth of a received signal. To that end, a receiver according to the present invention comprises a channel processor having multiple processing units. A first processing unit processes reference values (e.g., pilot signals) received for each of a plurality of frequencies within a signal bandwidth at a plurality of different signal times (or the complex propagation channel coefficients estimated therefrom) to determine a set of complex wave amplitudes either for each of multiple frequencies in the signal bandwidth or for each of the different signal times. A second processing unit subsequently processes the complex wave amplitudes to determine complex scattering coefficients, where each complex scattering coefficient corresponds to a respective scattering object in the wireless communication channel.
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Citations
38 Claims
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1. A method implemented in a wireless device of analyzing multi-path signals received over a wireless communication channel to characterize scattering objects in the wireless communication channel, the method comprising:
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receiving a reference value for each of a plurality of frequencies within a signal bandwidth at a plurality of different signal times; processing said reference values or complex propagation channel coefficients estimated therefrom to determine one of; a set of Doppler shifts of scattered wave energy and a corresponding set of complex wave amplitudes for each of multiple frequencies within the signal bandwidth, each Doppler shift corresponding to a different angle of arrival; and a set of path delays and a corresponding set of complex wave amplitudes for each of multiple signal times within an analysis interval; and processing said complex wave amplitudes to determine; a set of path delays corresponding to each angle of arrival or a set of angles of arrival corresponding to each determined path delay; and a complex scattering coefficient for each combination of path delay and angle of arrival, wherein each complex scattering coefficient corresponds to a respective scattering object in the wireless communication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless device for analyzing multi-path signals received over a wireless communication channel to characterize scattering objects in the wireless communication channel, the device comprising:
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a receiver configured to receive a reference value for each of a plurality of frequencies within a signal bandwidth at a plurality of different signal times; a first processing unit configured to process said reference values or complex propagation channel coefficients estimated therefrom to determine one of; a set of Doppler shifts of scattered wave energy and a corresponding set of complex wave amplitudes for each of multiple frequencies within the signal bandwidth, each Doppler shift corresponding to a different angle of arrival; and a set of path delays and a corresponding set of complex wave amplitudes for each of multiple signal times within an analysis interval; and a second processing unit configured to process said complex wave amplitudes output by the first processing unit to determine; a set of path delays corresponding to each angle of arrival or a set of angles of arrival corresponding to each determined path delay; and a complex scattering coefficient for each combination of path delay and angle of arrival, wherein each complex scattering coefficient corresponds to a respective scattering object in the wireless communication channel. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification