Method for sinusoidal modeling and prediction of fast fading processes
First Claim
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1. A method for compensating for multipath fading in a wireless network using multiple receiving antennas comprising:
- receiving a plurality of incoming signals on a plurality of antennas, said plurality of incoming signals including known data;
low pass filtering each incoming signal individually to produce a corresponding set of filtered data;
building a sinusoidal model of fading behavior for the incoming signals based on said corresponding set of filtered data and the known data, the sinusoidal model including a number of sinusoids to define the fading behavior, the number of sinusoids being obtained based on a maximum Doppler frequency of the plurality of incoming signals;
calculating combiner weights for each incoming signal based on the sinusoidal model; and
combining said incoming signals using said combiner weights.
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Abstract
The present invention discloses a method for predicting fast fading using sinusoidal modeling techniques. The method first applies a finite impulse response low pass filter to the incoming signal thus increasing the fading power to noise ratio. Applying a root-MUSIC frequency estimation model, a sinusoidal model for the fading process is obtained. This model can be used to enhance the performance of spatial diversity schemes or temporal processing schemes to reduce the effect of the fading.
25 Citations
2 Claims
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1. A method for compensating for multipath fading in a wireless network using multiple receiving antennas comprising:
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receiving a plurality of incoming signals on a plurality of antennas, said plurality of incoming signals including known data;
low pass filtering each incoming signal individually to produce a corresponding set of filtered data;
building a sinusoidal model of fading behavior for the incoming signals based on said corresponding set of filtered data and the known data, the sinusoidal model including a number of sinusoids to define the fading behavior, the number of sinusoids being obtained based on a maximum Doppler frequency of the plurality of incoming signals;
calculating combiner weights for each incoming signal based on the sinusoidal model; and
combining said incoming signals using said combiner weights.
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2. A program storage device readable by a machine, tangibly embodying a program of executable instructions to perform a method for compensating for multipath fading in a wireless network using multiple receiving antennas, the method comprising:
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receiving a plurality of incoming signals on a plurality of antennas, said plurality of incoming signals including known data;
low pass filtering each incoming signal individually to produce a corresponding set of filtered data;
building a sinusoidal model of fading behavior for the incoming signals based on said corresponding set of filtered data and the known data, the sinusoidal model including a number of sinusoids to define the fading behavior, the number of sinusoids being obtained based on a maximum Doppler frequency of the plurality of incoming signals;
calculating combiner weights for each incoming signal based on the sinusoidal model; and
combining said incoming signals using said combiner weights.
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Specification
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Current AssigneeAT&T Corporation (AT&T, Inc.)
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Original AssigneeAT&T Corporation (AT&T, Inc.)
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InventorsWinters, Jack Harriman, Hwang, Jeng-Kuang
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Primary Examiner(s)Nguyen, Lee
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Application NumberUS10/223,898Time in Patent Office469 DaysField of Search455/272, 455/273, 455/276.1, 455/295, 455/296, 455/306, 455/132, 455/137, 455/504, 455/506, 375/346, 375/347, 375/349, 342/380, 342/363US Class Current455/504CPC Class CodesH04B 17/3913 Predictive models, e.g. bas...
