Modulation Comparison in Intrabody Communication System Realized on PsoC Microcontroller

Ovaj se rad bavi usporedbom različitih modulacijskih metoda temeljem implementacije predajničko-prijamničkog para koristeći Cypressove mikrokontrolere PSoC. Uspješno su implementirane tri modulacijske metode koje koriste nekoherentnu demodulaciju (FSK, MSK i OOK), dok su tri metode koje koriste (djelomično ili potpuno) koherentnu demodulaciju (BPSK, QPSK i DPSK) prepoznate kao neprikladne za implementaciju na zadanom sustavu. Implementirane modulacijske metode rade zadovoljavajućom stabilnošću te dovoljnom brzinom prijenosa za potrebe medicinske biotelemetrije. Zadaća predajnika je digitalnim podacima modulirati prijenosni signal koji se ljudskim tijelom (kao komunikacijskim kanalom) prenosi do prijamnika, gdje se iz primljenoga nosioca izdvajaju korisni podaci.The subject of this thesis is the comparison of various modulation techniques used to implement an intra-body communication node, comprised of both the transmitter and the receiver. Both the transmitter and the receiver were to be implemented in the PSoC microcontroller, so CY8CKIT-059 prototyping kit was used. Three modulation methods were implemented successfully: frequency-shift keying, minimum-shift keying and on-off keying. On the other hand, binary, quadrature and differential phase-shift keying were not implemented due to many factors elaborated in the thesis. Duty of the implemented transmitter is to generate analog signal which is modulated by the digital data which is to be transferred using human body as a channel, while the receiver should demodulate the received signal and extract the useful data