Özet:

The main objective of software-defined radio (SDR) systems is to process radio signals fully numerically with a numerical sign processor. Modulation, demodulation, sign production, and line coding on these systems are done with a processor such as programable door series in the field significantly reduces the need for analog circuit-based equipment. Field Programmable Gate Array (FPGA) is a multi-integrated circuit of connections between programmable logic blocks with extensive application spaces. It is designed to fulfill the logical functions that the designer needs. Therefore, the function of every logic blog can be regulated by the user. In the programming phase of the FPGA, it is commonly used VHDL (Very High Speed Integrated Circuit Hardware Description Language). This study was first carried out on the VHDL code, the amplitude modulation (AM) transmitter, the FPGA card (Mimas Spartan 6). The sample audio recording to be used in modulation with the Audacity program is sent to the FPGA card through the audio card. The FPGA card receives an analog signal via the ADC (Analog/Digital Converter – LM4550) card and is received, demodulated, and recorded by HDSDR (High Definition Software Defined Radio) program. The FPGA card produces the transmitter signal in an analog form through the DAC (Digital / Analog Converter - LM4550) card and sends it to the laptop's audio card microphone entrance. And the last recorded transmitter signal was also demodulated offline with the matlab code and the result was recorded on the hard disk. The obtained demodulated signal is the same as the modulation signal in the head and the modulation is performed properly. As a result, a beautiful platform has been achieved for the implementation and training of software-defined radio systems (SDRs) on the programming gate series (FPGAs) in the field.

Anahtar Kelimeler:

Özet:

In SDR systems, the main purpose is to process the radio signals completely numerically with a digital signal processor. Performing operations such as modulation, demodulation, signal generation and line coding on these systems with a processor such as FPGA greatly reduces the need for analog circuit-based hardware. FPGA are digital integrated circuits that consist of interconnections between programmable logic blocks and have wide application areas. It is produced for the purpose of realizing the logic functions needed by the designer. Therefore, the function of each logic block can be edited by the user. VHDL is generally used in programming the FPGA. In this study, firstly, VHDL code was written and AM transmitter was realized on FPGA board (Mimas Spartan 6). The sample sound recording to be used in modulation with the Audacity program was sent to the FPGA card via the sound card. FPGA card received analog signal from ADC (LM4550) card, transmitter signal was received, demodulated and recorded with HDSDR program. FPGA card generated the transmitter signal in analog form via DAC (LM4550) card and sent it to the microphone input of the laptop's sound card. And finally, the recorded transmitter signal was demodulated offline with the matlab code and the result was saved on the hard disk. It has been observed that the demodulated signal obtained is the same as the initial modulation signal and the modulation is performed properly. As a result, a good platform for the implementation and training of SDR systems on FPGA has been obtained.