A Technique COFDM For Improving Efficiency To Transmitted An Images Through Modulation Technique For Wireless Communication Problem
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 2
Abstract
The GSM & CDMA technologies has been widely used in wireless 3G system, But today 4G system wireless transmitter and receiver are used in communication. In this paper we presents novel method for used maximum spectral efficiency from Coded Orthogonal Frequency Division Multiplexing (COFDM) system, and simulate for the transmission of an image of the size of 11,878 bytes in 120*90. Where COFDM show the effect of band pass filtering, for use of a raised cosine guard period, modulation BER rate, clipping distortion, frequency offset errors, and time synchronization error. These techniques utilize the knowledge of the radio channel response, to optimize the frequency, and subcarrier modulation. Modulation independently optimizes the modulation scheme, applied to each subcarrier so that the spectral efficiency is maximum, while maintain a target Bit Error Rate (BER). Also study OFDM technology with multipath current status of COFDM research appears a suitable, technique to modulation technique for high performance wireless telecommunications. And here one possible crucial problem in receiver side where receiver may require a very large memory range in order to handle the large signal strength variation between Tx and Rx.
Authors and Affiliations
Ms. Deepti Agrawal, Dr. J. S. Yadav
Keywords
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