Analysing the Performance of OFDM-SPM With and Without channel Coding to Enhance the Spectral Efficiency and BER

¹ Department of Electronics and Communications Engineering, Faculty of Dentistry, University of Alkafeel, Iraq
² Department of Electronics and Communications Engineering, Faculty of Engineering, University of Alkafeel, Iraq
³ Department of Electronics and Communications Engineering, Faculty of Engineering, Imam Al-Sadeq University, Iraq
⁴ University of Alkafeel, Najaf, Iraq

^* Corresponding author: amneen.naji@alkafeel.edu.iq

Abstract

A modulation technique has recently developed known as “OFDM with Subcarrier Power Modulation (OFDM-SPM)”. This technique utilizes two types of modulation. The first one called power modulation, where the power level of each subcarrier changes depending on the bit stream while transmit uses another type of conventional modulation such as a QPSK. The results shows that the adoption of OFDM with SPM improve the throughput, save the power, reduce the complexity, and so on. On the negative side, it shows degradation in the “Bit Error Rate” (BER) performance. In this paper, the convolutional code is the proposed to improve the BER while paired with the vitribi hard decision decoder which is considered easy to implement of the hardware and costs. the suggested methods will be discussed in the terms of throughput and BER with the three power reallocation policies ) PRPs).