Design and Implementation of an Advanced Digital Communication System Based on SDR

Abstract

Simplicity, flexibility, and high scalability are mandatory for modern digital communication systems. This can be achieved using software-defined radio (SDR) technology, which depends on digital signal processing (DSP) software algorithms. This paper considers designing the modulation and the demodulation parts of a single carrier digital communication system based on a Microcontroller(MC),, in which the signal is modulated digitally using a lookup table (LUT) module, while the receiver demodulates the signal using a digital signal processing algorithm by utilizing a single carrier discrete Fourier transform (DFT), both the receiver and transmitter employ Teensy 4.0 microcontroller which can be programmed using C++ language. The target data rate that will be used as a test for this paper is 10 kilo symbols/sec (KS/s), and it will support multi-modulation types. For the transmitter, modulation schemes such as BPSK, QPSK, 8QAM, 8PSK, and 16QAM are generated, while at the receiver, the symbols phases are exploited to detect the signal, rather than the amplitude, and this method is suitable for any type of modulation schemes, as a summary in this paper will achieve the design of two new ideas first is modulate the signal using MC and the other is the method of demodulate the signal using the MC.