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AssigneeThe United States of America as represented by the Secretary of the Navy
InventorRobert D. Pierce
Estimating the term…
A complex signal correlator such as can be implemented in a correlation detector system affords a unique algorithm which estimates the codifference correlation between two complex signals based on the sum and difference of codifference estimates, each codifference estimate having equivalently associated therewith a dispersion estimate. Typical embodiments provide a receiving antenna and a receiver inclusive of the codifference correlator, wherein radio frequency waves are down converted and sampled, the sampled signals are correlated with a reference signal contained in a memory, and the resultant correlation signal is detected and transduced. The inventive correlator is based on an alpha-stable distribution and, in comparison with conventional alpha-stable distribution-based correlators, can more effectively operate in a realm wherein alpha is less than one.
In a communication system of the type including antenna means for receiving electromagnetic waves, down converter means for down converting a modulated signal received from the antenna means, sampler means for sampling a down converted signal received from the down converter means, and memory means for storing a reference signal, a correlator for correlating said reference signal and a sampler signal received from said sampling means, said correlator comprising algorithmic means for calculating the codifference correlation based on the sum and difference of codifference estimates, wherein each said codifference estimate is equated with a corresponding dispersion estimate.
A correlation detection system for use in association with a modulated signal such as produced by an antenna receiving electromagnetic waves such as radio frequency waves, said correlation detection system comprising:
A method for producing an output signal which is indicative of a correlation of at least two input signals, said method comprising:
In a communication system of the type including antenna means for receiving electromagnetic waves and filtering means for filtering associated electromagnetic signals via a plurality of channels, a correlator for correlating at least one pair of said filtered signals transmitted via separate said channels, said correlator comprising algorithmic means for calculating the codifference correlation between a least one pair of said filtered signals based on the sum and difference of codifference estimates, wherein each said codifference estimate is equated with a corresponding dispersion estimate.
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