Digital Amplitude-Shift Keying (ASK) modulation is widely used in control systems such as health monitoring with bio-implants, tire pressuring monitoring systems etc. In binary ASK digital modulation, the time to transmit one bit of information depends on the length of the symbol. In a sound communication system, the symbol is transmitted as a sound pulse. The total transmission time of a message is associated with a symbol length. For a symbol length of 0.01 s, the transmission rate is 100 bps. But transmitting short sound pulses at low frequencies requires the use of low-quality factor emitters. This is necessary to be able to achieve fast decay for the small number of oscillations of the pulse being emitted. With a carrier frequency of 1000 Hz and a pulse duration of 0.01 s, the pulse contains 10 periods. On the other hand, to achieve the required received signal power that provides the desired Beet Error Rate (BER) levels, the use of high gain emitters allows the use of a lower power transmitting device. A contradiction arises between the two transmitter requirements due to the fact that a small quality factor does not allow a high gain factor to be achieved. In this paper, using a sound data transmission system with binary ASK digital modulation, how the BER levels change at different symbol lengths and carrier frequencies of the transmitted signal is investigated. The audio transmission and reception channels were implemented on a PC using the LabView.
Performance evaluation of ASK digital modulation for data transmission over an audio channel
14TH INTERNATIONAL SCIENTIFIC CONFERENCE ON AERONAUTICS, AUTOMOTIVE, AND RAILWAY ENGINEERING AND TECHNOLOGIES ; 2022 ; Sozopol, Bulgaria
AIP Conference Proceedings ; 3064 , 1
10.04.2024
6 pages
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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