Experiments in Pulse Communications With Filtered Sidebands

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  • Author: H.R. Walker
Any RF communications system that uses carrier on/off pulses can be designed to have better receiver sensitivity by using negative or zero group delay narrow band filters in the receiver. These filters greatly reduce the bandwidth normally required by removing the sidebands, while retaining the necessary information in the pulsed on/off carrier. SNR improvements greater than 40 dB are being obtained by means of bandwidth reduction alone (Processing Gain). The method is applicable to RADAR, TACAN, IFF, DME, PAM, PWM, UWB and UNB data methods. The information presented here enables any experimenter to duplicate the displayed results. There are no tricks or secrets, but readers should remember that this method only applies to on/off pulse communications, where the sidebands do not contain modulation information.