Implementation of DCSK modulator and demodulator in FPGA

U ovom radu opisan je postupak izrade DCSK modulatora i demodulatora temeljenih na teoriji kaosa, odnosno kaotičnim signalima, opisanih koristeći VHDL jezik za opisivanje sklopovlja te implementirnih na FPGA integrirani krug Zybo Z – 7000. Prvo je opisana teorija kaosa te kako se od te teorije došlo do kaotičnih signala i DCSK modulacije. Zatim su opisani VHDL jezik za opisivanje sklopovlja i zbog čega je nastao te kako se pomoću njega opisuju sklopovi, te Zybo razvojna pločica i sve njene komponente i mogućnosti. Zatim je opisan proces izrade DCSK modulatora i demodulatora te što svaki blok u dizajnu predstavlja i kako radi. Nakon toga, opisani su Vivado i ModelSim alati koji su korišteni za simulaciju i implementaciju dizajna. Završno, prikazano je zauzeće dizajna na samoj Zybo pločici te testiranje ispravnosti rada samog dizajna pomoću računala, preko USB - UART adaptera odnosno UART protokola.This paper describes the procedure for designing DCSK modulator and demodulator, based on Chaos theory and chaotic signals. VHDL hardware description language is used to describe the design, while FPGA integrated circuit, Zybo Z – 7000, is used for implementation. Firstly, the Chaos theory was described and how DCSK modulation was derived from the knowledge about chaos. Secondly, the VHDL hardware description language was introduced and an explaination on how to use it to describe electrical circuits and why it was made in the first place is given. Thirdly, Zybo development board and all it's components and functionalities are described. Then the proces of designing the DCSK modulator and demodulator is described, along with what each block of the design represents and how it works. Afterwards, Vivado, ModelSim and their use for simulation and implementation of the design is given. Finally, the design's usage of the Zybo board and the testing of the design itself using a computer and an USB – UART adapter is show