Comparison on PAPR and BER in resource allocation for MIMO-OFDMA based cognitive radio using diversity technique / Nur Ariffin Abdul Razak

Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier Frequency Division Multiple Access (SC-FDMA) is suitable for high speed transmission in downlink transmission and uplink transmission respectively. Recently, spectrum sharing is widely used in the OFDMA-based system. Cognitive radio (CR) is one of the spectrums sharing that emerging in the mobile wireless network and creates opportunity for the network to be use when the network is vacant. However, OFDMA has high Power-to-Peak Average Ratio (PAPR) and consists of minimum diversity order system. This paper objective is to evaluate the performance of both resource allocation for MIMO-OFDMA and SC-FDMA based on cognitive radio network (CRN) parameters. It aims to achieve maximum diversity order system by implementing Space-Time-Frequency Block Code (SFTBC) technique and to compare PAPR between both systems, for better performance in application that requiring low PAPR in cognitive radio (CR). The result obtained proves that the present of STFBC reduce the bit error rate (BER) while improve the signal at the receiving end and achieve lower PAPR compared to the existing OFDMA and SC-FDMA system.