Injected coded reference for adaptive array systems
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorPeder M. Hansen
Life of this patent
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Abstract
A coded signal is added in the transmitting channel of a communications sem to provide, at the receiver site, an adaptive processor with a reference signal for adaption. At the receiver site, the reference signal is removed to provide an error signal which is fed to the adaptive array processor. The error signal is also fed directly to the communications receiver without further processing.
Claims5
In a communication system having adaptive signal processing the improvement comprising:
- (a) first means for generating a coded reference signal filtered to match the bandpass of the system;
- (b) second means for generating a signal representing information to be transmitted by said communication system;
- (c) third means for combining said coded reference signal with said information signal;
- (d) transmitter means for transmitting said combined signals;
- (e) a receiving system for receiving the signal transmitted by said transmitter means, said receiving system including a reference signal recovery loop for recovering said reference signal that can be combined with the output signal from an adaptive array to form the error signal for adaptive signal processing.
A method of providing an existing communication system having an existing signal with a coded reference signal that can be used by an adaptive signal processor the steps of:
- (a) adding a coded reference signal to the existing signal
- (b) transmitting said combined signals so that both signals are transmitted in the same bandwidth;
- (c) generating an approximation of the transmitted coded reference signal and;
- (d) generating an error signal for use by an adaptive array processor by substracting said approximation of the transmitted coded reference signal from said transmitted signal.
Dependencies are inferred from the claim text.