ADBU-Journal of Engineering Technology Timande, AJET, ISSN:2348-7305, Volume 9, Issue 2, December, 2020, 009020992(7PP) 1 A Review on PAPR Reduction in Perspective of BER Performance in MIMO-OFDM Based Next Generation Wireless Systems. Balram D. Timande 1 , Dr. Manoj Kumar Nigam 2 1 Research.Scholar, Department of Electronics and Telecommunication Engineering, MATS University, Raipur, Chattishgarh, India 1 balramtimande@gmail.com 2 Professor,Department of Electrical & Electronics Engineering, MATS University, Raipur, Chattishgarh, India 2 nigam74_123@yahoo.com Abstract: Today, high speed and trustworthy wireless communication over mobile is the requirement of society. As the mobile applications and the users are rapidly increasing, it is obligatory to have more reliable, high speed wireless network with high throughput, which will combat the disadvantages in existing system in this multiuser environment. In wireless system the received signal may be corrupted due to noise and interferences such as ‘inter symbol interference’ and ‘inter carrier interference’ when subjected to multi-path fading. Also the performance of the system may be affected due to poor ‘bit error rate’ and high ‘peak to average power ratio’ value, which further affect the signal power and spectral efficiency of transmitted signal. The blend of ‘orthogonal frequency division multiplexing’ and ‘multi input multi output’ antenna system referred as MIMO-OFDM system, which offers the improvement in quality of service and higher throughput to satisfy the tomorrow’s need. This review article mainly focuses on various technologies adopted by different researchers for enhancing the ‘bit error rates’, ‘peak to average power ratio’, ‘signal to noise ratio’ and ‘spectral efficiency’ performances in wirel ess systems. We continue by highlighting the limitations and comparing results of conventional methods, schemes and algorithms proposed by different researchers. We also focus on the multiple antenna system (MIMO), which is designed for future multiuser environment to enhance the capacity or to have high throughput along with good quality services. Keywords: 5G, Wireless, Antenna, Interference, Multicarrier, modulation, MIMO, OFDM, PAPR, BER. (Article history: Received: 14th May 2020 and accepted 24 th December 2020) I. INTRODUCTION In this modern era, the digital communications over wireless link have made remarkable development that connects entire world with ultra high speed digital communication. Today mobile users, applications, and protocols are rapidly changing, and the world is switching towards next generation 5G technologies [1, 2]. This switching to new generation faces many challenges as it deals with different wireless communication standards such as IEEE 802.11a, IEEE 802.16a, and protocol at same time. The primary objective of the next generation communication system is to reduce the system complexity due to involvement of different technologies and algorithms, to reduce the power, to utilize available bandwidth optimally and to provide errorless reliable high-speed wireless communication. To combat with various challenges in wireless link, an integration of MIMO (Multi-Input- Multi-Output) and OFDM (Orthogonal-Frequency-Division- Multiplexing) technology is playing key role in next generation system [3]. The MIMO-OFDM system combats frequency selective fading and avoids the application of complex equalizers. It is an endowed technology for reliable communication systems providing good spectral efficiency [4]. The MIMO-OFDM schemes take advantage of spatial diversity to provide exceptionally high capacity, throughput, and robustness against ISI (Inter-Symbol-Interference)[5]. The MIMO-OFDM has been adopted in several standards like Wi-Fi (wireless Fidelity), LTE (Long-Term-Evolution), LTE Advance or 3GPP (Third-Generation- Partnership- Project), Wi-MAX (Worldwide-Interoperability for Microwave-Access) / IEEE 802.16m, WLAN (Wireless- Local Area-Network) / IEEE802.11n [3, 6]. However, in multipath fading environment the MIMO-OFDM wireless systems are susceptible to different types of error rates like BER (Bit- error-rate), SER ( symbol-error-rate), and FER (Framing- error-rate), Interferences like ISI, ICI (Inter- carrier- interference) and High PAPR (Peak to Average-