METHOD TO DETECT SIGNALS WITHOUT CARRIER Russian patent published in 2013 - IPC H04K1/00 

FIELD: radio engineering, communications.

SUBSTANCE: received and digitised signal is divided into fragments of equal length. Then the second fragment is element-by-element added to the first fragment, and in the sum produced a time count of highest module is identified and saved. Afterwards in the second fragment the counts are shifted by one position so that the first one occupies the position of the second one, and the last one - of the first one, and after summation again the time count of highest modulation is identified and saved. The specified actions are repeated until the first count occupies the position of the last one, and the last one - of the last but one. Then the sum is chosen, to which the maximum of the saves values corresponds. Then the remaining fragments are similarly added to the selected sum. In the resulting summary fragment the negative and positive values of maximum module are defined as parameters of a digitised signal, which are compared with the threshold value of the noise level equal to the tripled value of the mean square value of time counts of the summary fragment. The decision on signal detection is made, if at least one of the identified parameters exceeds the value of the specified threshold.

EFFECT: possibility to detect short-term single signals without a carrier.

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