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(b) Software
The software subsystem of the SDR is a digital part that processes the baseband signals. This processing is carried out via a Field Programmable Gate Array (FPGA), a type of digital signal processor used in conventional computers. The transmitter also has a digital-to-analog converter, while the receiver has an analog-to-digital converter, enabling the conversion between the analog and digital domains within the SDR architecture.
2) USRP B210: The GNU Radio project has designed the USRP B210 model, which has a digital interface for a computer¡¯s USB 3.0 port and an analog interface for an SDR device. This USRP B210 device provides radio access with a frequency coverage ranging from 70 MHz to 6 GHz, and can also operate as a 5G NSA (4G-5G) base station, thus offering an integrated solution for wireless communications.
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IEEE/ICACT20250024 Slide.14
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