iJournals: International Journal of Software & Hardware Research in Engineering (IJSHRE) ISSN-2347-4890 Volume 11 Issue 1 January 2023 Ishwarlal Rathod; Ankit Saxena, Volume 11 Issue 1, pp 36-40 January 2023 Performance Estimation of 2*1 MISO-MC- CDMA in Different Modulation Technique Ishwarlal Rathod Asst. Professor Symbiosis University of Applied Sciences Indore (M.P) ishwarlal.rathod@suas.ac.in; en21el601003@medicaps.ac.in Ankit Saxena Assoc. Professor Medi-caps University Indore (M.P) Ankit.saxena@medicaps.ac.in In this research, we estimate the performance of a 2*1 MISO-MC-CDMA system in a Rayleigh fading channel using QPSK, 8-PSK, 8-QAM, 16- QAM, 32-QAM, and 64-QAM modulation schemes in MATLAB in order to lower the bit error rate (BER). CDMA is a multi-user technology that employs a spread spectrum system in which the transmitter's PN sequence generator is used to spread the sequence. This system is then integrated with OFDM (multi- carrier system), in which a single broadband frequency-selective carrier is converted into parallel narrowband flat-fading multiple sub- carriers in order to improve the system's performance, to form the MC-CDMA system. Implementing a 2*1 MISO system, consisting of two transmit antennas and one receive antenna, with a ZF decoder at the receiver to reduce bit error rate (BER) and transmit diversity 12 rate convolution ally encoded Altamonte STBC (Space Time Block Code) block code, optimises the performance of the 3G and 4G communication system by reducing BER and increasing gain. CDMA, OFDM, MISO, MISO-MC-CDMA, and MC-CDMA are terms of interest. 1. INTRODUCTION By decreasing BER, the combination of CDMA, OFDM, and MISO enhances the system's performance. Therefore, the combination of OFDM and CDMA yields MC-CDMA, and the combination of MC-CDMA and MISO yields the highly optimised MISO-MC-CDMA system. This is a result of an increase in user demand for high data rates and low error probabilities in existing systems, so in this paper we use MISO, CDMA, and OFDM to enhance the technique by minimising error rate. Multiple Input Single Output (MISO) is a multiple antenna system that uses receive diversity and transmit diversity to synchronise the system and reduce ISI. The ZF equaliser is utilised to reduce mean square error and detect orthogonally. The 12 convolution ally-encoded Altamonte STBC block code is used for transmit diversity. Lastly, the above system is analysed in a Rayleigh fading channel using various modulation techniques [3].2. LITERATUE SURVEY 2.1. Multiple Input Single Outputs (MIMO) MISO system consists of multiple transmitting and multiple receiving antennas for obtaining high data rates in multipath scattering settings with the existing transmission bandwidth or the existing total transmitted power of the system. Fig.1 depicts the MIMO channel of m transmit (Nt = m) and n receive (Nr = n) antennas. MISO approaches give good data rates by spatial multiplexing by increasing the system's spectral efficiency, which is abundant in situations with abundant scattering, and by providing spatial diversity. The number of transmit-receive