Singh Pratik et al.; International Journal of Advance Research, Ideas and Innovations in Technology © 2018, www.IJARIIT.com All Rights Reserved Page | 55 ISSN: 2454-132X Impact factor: 4.295 (Volume 4, Issue 5) Available online at: www.ijariit.com A review article of signal to noise ratio using frequency division multiplexing PSO algorithm Pratik Singh pratikbsingh@gmail.com Scope College of Engineering, Bhopal, Madhya Pradesh Manish Gupta manish85399@gmail.com Scope College of Engineering, Bhopal, Madhya Pradesh Anshuj Jain echodscope@gmail.com Scope College of Engineering, Bhopal, Madhya Pradesh ABSTRACT The demand for high-speed mobile wireless communications is growing at a very fast rate. PSO OFDM technology is a key technique for achieving the high data rate and spectral efficiency requirements for wireless communication systems. Frequency Division Multiplexing (PSO OFDM) [3–6] has emerged as a successful air-interface technique. The Frequency division Multiplexing was originally developed from the multi-carrier modulation techniques used in high-Frequency military radios. This thesis presents, a Simulink based simulation system is implemented using Particle swarm optimization (PSO) to study the performance analysis of Bit Error Rate (BER) vs. Signal to Noise ratio (SNR). The model of PSO OFDM with Rician fading channel using Simulink in MATLAB is discussed. This model is used for performance enhancement of the PSO OFDM with QPSK and QAM modulation schemes and channel condition. The throughput and packet error rate is used to evaluate the performance of the MAC layer with the change in the physical layer parameter. The performance analysis of different technologies used in the QAM PSO OFDM is compared by visualizing the BER vs. SNR curve. Keywords— PSO OFDM (Frequency division multiplexing), QAM, PSO 1. INTRODUCTION Increasing in telecommunications services that demand large amounts of bandwidth. Services such as interactive multimedia, video conferencing and streaming audio have made the capacity of the existing optical fiber systems insufficient. To increase this capacity, time division multiplexing (TDM) has been used traditionally. However, TDM has a few drawbacks. The important is that the existing electronic technology allows multiplexing only up to about 10 Gb/s. Thus; an alternative optical multiplexing technique that avoids the 10 Gb/s electronic bottleneck is very attractive. PSO OFDM is one such promising technique that can be used to exploit the huge available bandwidth of the optical fiber. In PSO OFDM, the optical transmission spectrum is divided into a number of no overlapping Frequency bands, with each Frequency supporting a single communication channel operating at peak electronic speed. Thus, by allowing multiple PSO OFDM channels to coexist on a single fiber, the huge bandwidth can be tapped into. PSO OFDM is a technique for simultaneous transmission of two or more optical signals on the same fiber. The signals from different sources are combined by a multiplexer and fed into an optical fiber which is the transmission medium. At the receiving end, different signals are separated by a de- multiplexer and detected by photodetectors. The PSO OFDM scheme increases the transmission capacity of optical communication systems considerably. The two configurations of PSO OFDM systems that are possible are the one-way and the two-way (bidirectional optical fiber) transmission systems as illustrated in figure 1, while the one-way system requires only one receiver or one transmitter per channel at each end, the two-way system requires both receiver and transmitter at each end of every channel. Optical multiplexers and de-multiplexers may be classified into Frequency selective and Frequency nonselective devices. The Frequency selective devices are either active or passive. The active devices are implemented using multi-Frequency light Sources or multi-Frequency photodiodes [5]. 2. DIGITAL MODULATION TECHNIQUE The basic concept behind digital modulation is to identify efficient schemes taking M different symbols in a given digital alphabet and transforming them into waveforms that can successfully transmit the data over the transmission channel. There are three basic types of modulation schemes which are followed as 1. Frequency shift keying (FSK) 2. Amplitude shift keying (ASK) 3. Phase-shift keying (PSK)