NB-IoT, short for NarrowBand IoT, is a communication standard designed to enable the communication of a large number of connected objects over long distances. One of the research areas in NB-IoT systems is the Peak-to-Average Power Ratio (PAPR). NB-IoT, which is an extension of the LTE (Long Term Evolution) technology of 4G, uses the Single Carrier Frequency Division Multiple Access (SC-FDMA) technique in the UpLink (UL), known for generating a low PAPR. However, due to power amplifier non-linearities, it is necessary to reduce the PAPR to optimize the transmitter's energy consumption. Drawing upon classical PAPR reduction techniques used in OFDM, we propose the application of the clipping" technique [1, 2] to the SC-FDMA system.
In this paper, we analyze the in uence of the Clipping Factor (CF) on PAPR reduction gain and investigate the impact of attenuation factors of two transmission filters, the Raised-Cosine (RC) filter and the Root Raised-Cosine (RRC) filter, on the PAPR probability distribution func- tion. The analysis shows a reduction gain of approximately 2.5 dB or 33.33% at a cumulative distribution function of 10􀀀3, which is lower compared to situations where no clipping technique is implemented in the system. Two scenarios were tested, namely the clipping system as- sociated with the Root Raised-Cosine filter and the clipping system as- sociated with the Raised-Cosine filter. The system associated with the Raised-Cosine filter yields better results.

Peak to Average Power Ratio (PAPR) Single-carrier FDMA (SC-FDMA) Narrowband { Internet of Things (NB-IoT) Networks