Indonesian Journal of Electrical Engineering and Computer Science Vol. 26, No. 2, May 2022, pp. 888~894 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v26.i2.pp888-894  888 Journal homepage: http://ijeecs.iaescore.com Performance improvement on spectral efficiency and peak to avearge power reduction for 5G system Kavitha Thandapani 1 , Ganesamoorthy Raju 2 , Maniganda Pujali 1 1 Department of Electronics and Communication Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai, India 2 Department of Mechanical Engineering, Chennai Institute of Technology, Chennai, India Article Info ABSTRACT Article history: Received Jan 20, 2022 Revised Mar 12, 2022 Accepted Mar 23, 2022 Filter bank multicarrier with offset quadrature amplitude modulation (FMBC/OQAM) system which can offer higher data rate 1 Gbps and improved bandwidth efficiency because of not require of cyclic prefix (CP) to avoid interference from the adjacent channels compared to fourth generation (4G) orthogonal frequency division multiplexing (OFDM) and other wireless systems. Because of these advantages FBMC/OQAM are used in fifth generation (5G) technology. In this FBMC/OQAM system, bandwidth capacity will be further increased by using multiple input multiple output (MIMO) channel. But in our proposed scheme we can use hyper–MIMO channel, in which at base station (BS) more number of transmitting antennas are used that for the improve the spectral efficiency performance better than traditional MIMO channel. But the most important drawback of hyper MIMO FBMC/OQAM is the higher peak to average- power ratio (PAPR) that degrade overall system performance in 5G. In 4G technology, to reduce PAPR a number of techniques are used. In our proposed system we can use mu-law non-linear companding technique and precoding discrete cosine transform (DCT) to reduce PAPR value for multicarrier modulation system compare to other systems. Keywords: 5G Discrete cosines transform precoding Hyper multiple input multiple output Peak to average power reduction Spectral efficiency This is an open access article under the CC BY-SA license. Corresponding Author: Kavitha Thandapani Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr. Sagunthala R&D institute of Science and Technology No.42, Avadi-Vel Tech Road, Vel Nagar, Chennai, Tamil Nadu 600062, India Email: drkavitha@veltech.edu.in 1. INTRODUCTION The number of subcarriers in a wireless system are usually independent with each other but they are in same phase and may be aligned to produce constructive superposition that will produce the high values of envelope peaks. The huge power variation in the transmitted information signal is usually measured by PAPR parameter which is considered as severe problem in fifth generation (5G) systems. To decrease this peak to average-power ratio (PAPR) problem at 5G, many researcher are now using filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) system [1], [2]. To higher the throughput value as well as increase the reliability of particular wireless system and for more coverage, multiple input multiple output (MIMO) system are used with FBMC/OQAM. At both the MIMO transmitter and receiver, a number of multiple antennas are used [3], [4]. FBMC/OQAM with MIMO is a one among the most promising technology in wireless system of 5G [5]–[7]. A new scheme discrete cosine transforms (DCT) precoding with non-linear mu-law companding which is applied to MIMO FBMC/OQAM model for improving the spectral efficiency and also the reduction in PAPR is proposed in this paper. At the end of this paper, simulation