Implementation of Modulation Techniques

Abstract

The world is at the apex of a communications revolution. Computers are having an extraordinary impact on the world today. A technological transformation during the last two decades has provided a potential growth in the area of digital communication and lot of newer applications and technologies are coming up everyday due to these reasons. Any information in the form of electrical signal is termed as data and there is a huge requirement of efficient data transfer techniques between two or more places through any means available. The available communication systems have been efficient so far, now, the need to develop better and more secure communication system which can handle the problems of spectral congestion and co-channel interference is necessary. Digital communication techniques have given better results over its analog counterpart as it provides larger immunity to noise, at the price of large bandwidth requirements. The requirement of video, audio and data over the computer network or the mobile telephony network termed as the third generation (3G) mobile communication poses a serious problem for the bandwidth. So the existing modulation techniques need to be modified for the purpose where it can handle both the situations of noise and bandwidth efficiency. The major advantage of using digital modulation technique is that the use of digital signals reduces hardware noise and interference problems as compared to the analogue signal where large number of waveforms will be required resulting in a larger bandwidth for the symbol to be transmitted.