AMPLITUDE MANIPULATION SIGNAL DEMODULATOR WITH ADAPTIVE DECISION THRESHOLD

The purpose of this work is to develop a method for adaptive adjustment of the decision threshold value, which will allow demodulation of signal packets in the form of long sequences of amplitude-manipulated zeros (ones) transmitted in channels with fading with minimal errors. To achieve this goal, an analysis of existing prototype devices was carried out, the conditions of their applicability, weaknesses and properties were identified, on the basis of which a block diagram of the device was developed. To substantiate the advantages of the proposed demodulator, its experimental verification was performed. The experimental results show that the developed device has higher noise immunity indicators compared to the considered signal demodulators, providing, under certain parameters, almost error-free demodulation of amplitude manipulation signals, which include long sequences of zeros and ones in the presence of fading in the channel. The developed device can significantly increase the noise immunity of radio communication systems in the decameter range.