Universal transceivers and supplementary receivers with sparse coding technique option

Abstract

A transmitter is provided having a signal generator configured to generate a sparse code signal where the signal has a substantially small duty cycle of about 0.5% and substantially small pulse widths, with the distance between the pulses defined by the sparse code, and sufficiently low carrier signal level so that the signal can only be detected via a matched receiver.

What is claimed is: 
     
         1 . A transmitter comprising:
 a signal generator configured to generate a sparse code signal wherein said signal has a substantially small duty cycle of about 0.5% and substantially small pulse widths, with the distance between said pulses defined by said sparse code, and sufficiently low carrier signal level so that the signal can only be detected via a matched receiver.   
     
     
         2 . The transmitter according to  claim 1  wherein different devices have different bandwidths so that unmatched bandwidths producing sufficient inter-symbol interference energy resulting in that the signal can only be detected via a matched receiver. 
     
     
         3 . The transmitter according to  claim 1  wherein different devices have different carrier frequencies so that the signal can only be detected via a matched receiver. 
     
     
         4 . A receiver that has the matching characteristic which can detect signals from a transmitter constructed according to  claim 1 . 
     
     
         5 . A receiver that has the matching characteristic which can detect signals from a transmitter constructed according to  claim 2 . 
     
     
         6 . A receiver that has the matching characteristic which can detect signals from a transmitter constructed according to  claim 3 .