Multichannel non-gaussian receiver and method
First Claim
1. A multichannel, non-Gaussian receiver for use with a host system, said host system receiving an observed data signal with a signal vector with a signal of interest obscured by Gaussian noise and non-Gaussian noise, said multichannel non-Gaussian receiver producing a detection signal containing H0 when the signal of interest is not present in the observed data signal, and H1 when the signal of interest is present in the observed data signal, said multichannel non-Gaussian receiver comprising:
- a means for subtracting the signal vector from the observed data signal from the host system to produce thereby a first subtraction signal;
a means for estimating the signal of interest from the observed data signal to produce an estimate signal;
a first linear prediction error filter which processes the first subtraction signal and the estimate signal to produce thereby a first output signal which has data;
a second linear prediction error filter which processes the observed data signal from the host system with the estimate signal to produce a second output signal which has data;
a means for transforming the first output signal of the first linear prediction error filter based upon the probability distribution function (pdf) of the data of the first output signal;
a means for transforming the second output signals of the second linear prediction error filter based upon the probability distribution function (pdf) of the data of the second output signal;
a means for subtracting a second Gaussian equivalent signal from a first Gaussian equivalent signal to produce thereby a second subtraction signal; and
a means for generating test statistic signals which receives and processes the second subtraction signal to produce thereby said detection signal for said host system via threshold comparison.
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Abstract
A process and system for improving the detection of signals in additive correlated non-Gaussian noise using multichannel data. This improves detection performance of receivers through the signal processing architecture when the observation data X(n) is first split into an upper and lower path. In the upper path, the known signal is first subtracted from the data and then passed directly to the prediction error filter. The output of the prediction error filters are then input to the zero-mean non-linear processor and their associated estimated variances are used to determine H0 and H1 where H0 denotes the condition where no signal is present in the data and H1 denotes the signal present case.
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Citations
16 Claims
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1. A multichannel, non-Gaussian receiver for use with a host system, said host system receiving an observed data signal with a signal vector with a signal of interest obscured by Gaussian noise and non-Gaussian noise, said multichannel non-Gaussian receiver producing a detection signal containing H0 when the signal of interest is not present in the observed data signal, and H1 when the signal of interest is present in the observed data signal, said multichannel non-Gaussian receiver comprising:
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a means for subtracting the signal vector from the observed data signal from the host system to produce thereby a first subtraction signal; a means for estimating the signal of interest from the observed data signal to produce an estimate signal; a first linear prediction error filter which processes the first subtraction signal and the estimate signal to produce thereby a first output signal which has data; a second linear prediction error filter which processes the observed data signal from the host system with the estimate signal to produce a second output signal which has data; a means for transforming the first output signal of the first linear prediction error filter based upon the probability distribution function (pdf) of the data of the first output signal; a means for transforming the second output signals of the second linear prediction error filter based upon the probability distribution function (pdf) of the data of the second output signal; a means for subtracting a second Gaussian equivalent signal from a first Gaussian equivalent signal to produce thereby a second subtraction signal; and a means for generating test statistic signals which receives and processes the second subtraction signal to produce thereby said detection signal for said host system via threshold comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A multichannel, non-Gaussian receiver process for use with a host system, said host system receiving an observed data signal with a signal vector with a signal of interest obscured by either Gaussian noise or non-Gaussian noise,
said multichannel non-Gaussian receiver process producing a detection signal for hypothesis H0 when the signal of interest is not present in the observed data signal, and H1 when the signal of interest is present in the observed data signal, said multichannel non-Gaussian receiver process comprising the steps of: -
a first subtracting step that comprises subtracting the signal vector from the observed data signal from the host system to produce thereby a first subtraction signal; estimating the signal of interest from the observed data signal to produce an estimate signal; a first step which uses a first linear prediction error filter which processes the first subtraction signal and the estimate signal to produce thereby an output signal; a second step which uses a second linear prediction error filter which processes the observed data signal from the host system with the estimate signal to produce an output signal; a transforming step that comprises transforming the output signal of the first linear prediction error filter using a first ZMNL transformation unit; a second transforming step that comprises transforming the output of the second linear prediction error filter using a second ZMNL transformation unit a second subtracting step that comprises subtracting the second ZMNL transformed signal from the first ZMNL transformed signal to produce thereby a second subtraction signal; and generating threshold signals from the second subtraction signal to produce thereby said detection signal for said host system. - View Dependent Claims (13, 14, 15, 16)
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Specification