Implementation and analysis of recombination techniques within the receiver for IoT based applications

The growing popularity of IoT (Internet of Things) and its applications is evident from the increasing number of connected devices and IoT services. To enable connectivity for these devices, various wireless low-power and wide-area networks (LPWAN) have been established. In this paper, recombination mechanisms within the Receiver for IoT Based Applications were analyzed. Indeed, the principle on which the repetitions mechanism is based is simple: to emit a repetition is to increase the total energy dedicated to the information, and to increase this energy is theoretically to facilitate the demodulation of the information at the receiver stage. In this particular research, the focus is on evaluating the effectiveness of various diversity combiners employed at the receiver. To conduct the analysis, a transmission chain based on GMSK (Gaussian Minimum Shift Keying) modulation is proposed. Simulation results show that increasing the number of repetitions decreases the BER (Bit Error Rate) of the considered mechanism. Furthermore, simulation shows that the EGC (equal-gain combining) and SC (selection combining) mechanisms are very sensitive to the speed of evolution of the channel. However, the performance of MRC (maximal ratio combining) mechanism changes slightly when the transmitter speed increases; especially, at low SNR (signal-to-noise ratio).