Scale adaptive filtering
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorPaul Gendron
Life of this patent
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Abstract
A scale adaptive filtering scheme is developed for underspread channels based on a model of the linear time varying channel operator as a process in scale. Recursions serve the purpose of adding detail to the filter estimate until a suitable measure of fidelity and complexity is achieved.
Claims13
A method for scale adaptive filtering to identify a relationship between a source signal and an actual received signal, said method comprising:
- calculating a scale wherein said scale includes a time delay of a channel operator of the actual received signal, and a frequency spread;
- estimating at least one wavelet coefficient;
- determining an estimated received signal at the scale using the wavelet coefficient;
- determining when the estimated received signal is sufficiently similar with respect to the actual received signal;
- and
- re-calculating the scale by a factor when the estimated received signal is not sufficiently similar with respect to the actual received signal.
A system for scale adaptive filtering operable to identify a relationship between a source signal and an actual received signal, said system comprises:
- a receiver operable to receive said actual received signal;
- and
- a processor operable to calculate a scale wherein said scale includes a time delay and a frequency spread, estimate at least one wavelet coefficient, determine an estimated received signal at the scale using the wavelet coefficient, determine when the estimated received signal is sufficiently similar with respect to the actual received signal, and re-calculate the scale by a factor when the estimated received signal is not sufficiently similar with respect to the actual received signal.
A computer readable medium of instruction for adaptive filtering to identify a relationship between a source signal and an actual received signal, comprising:
- a first set of instruction adapted to calculate a scale wherein said scale includes a time delay and a frequency spread;
- a second set of instructions adapted to estimate at least one wavelet coefficient;
- a third set of instructions adapted to determine an estimated received signal at the scale using the wavelet coefficient;
- a fourth set of instructions adapted to determine when the estimated received signal is sufficiently similar with respect to the actual received signal;
- and
- a fifth set of instructions adapted to re-calculate the scale by a factor when the estimated received signal is not sufficiently similar with respect to the actual received signal.
Dependencies are inferred from the claim text.