Performance Analysis of PAPR and BER with Peak Clipping Under DFT Spreading and Trellis Coding In 5g Communications

Abstract

The wireless (mobile) communication system took time to evolve to where it is today, changed drastically since Guglielmo Marconi first demonstrated radio s ability to provide continuous contact with ships sailing the English Channel. Nowadays, in a world of high mobility, transmission system speed and capacity are essential components to maintain communication and connectivity among remote people all around the world. The early digital communication systems were based on single carrier modulation. Generally, by reducing the symbol duration, I can increase the bit rate of a transmission system. However, the presence of a multipath channel introduces inter symbol interference (ISI) requiring complex equalization. Multicarrier modulation (MCM) is a good alternative in order to counteract the multipath fading effects. In multicarrier communications the data is transmitted over many frequencies instead of a single carrier, dividing the wideband frequency selective communication channel into several sub bands with mildly selective fading. The subcarriers are generally selected to be orthogonal, in such a way that their spectra overlap but without causing interference to the other subcarriers. The bandwidth of each sub channel is smaller than coherence bandwidth of the propagation channel. It means, the maximum delay spread of the channel is much lower than the symbol duration. Consequently, each sub channel experiences a flat fading and the ISI in each sub channel becomes very small. newlineToday, the search for a new waveform for 5G and beyond wireless communication systems continues, with high spectral efficiency, low cost and less disadvantages of multicarrier systems. The high Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) is one of the major challenges in 5G communication systems. In this thesis report, I analyze the performance of PAPR and Bit Error Rate (BER) with peak clipping under DFT spreading and Trellis coding in 5G communication systems. DFT Spreading is a technique that