JELE_V5_N1_RP2 M. Devarajan A. Karikalan Journal on Electronics Engineering 2249 – 0760 5 1 21 26 Optical Wireless, BPSK (Binary Phase Shift Keying), ASK (Amplitude Shift Keying), FSK (Frequency Shift Keying), QPSK (Quadrature Phase Shift Keying), OOK (ON-OFF Keying), Mobile Communications, BER (Bit Error Rate) This paper, presents a method to describe all modulation techniques such as BPSK, ASK, FSK, QPSK, OOK. These are compared based on bandwidth requirement, power efficiency, transmission capacity and bit error probability. The modulators are the basic requirement of optical communication systems and they have been designed to reduce the channel distortion, and hence many types of modulation techniques have been proposed here. This paper, mainly focuses on the hardware realization of such several modulation schemes with a minimum area strategy for the universal mobile telecommunication system when it comes to power and error performance. Here MATLAB software is used for simulation and result analysis. September – November 2014 Copyright © 2014 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3319