MHPM the best adaptive modulation technique for OFDMA and MC CDMA techniques using improved rate turbo coder for future wireless communication

Abstract

Today the wireless communication has attracted around two third of world population due to its linear development both in technology as well as increase in user demand The development of cellular and mobile communication has been classified in terms of generation Long term Evolution or 4G would be the next generation mobile standard to be introduced shortly before the end of 2012 The salient features of LTE includes increased download and upload rates use of Multiple Input and Multiple Output as antenna technology Orthogonal Frequency Division Multiplexing as the modulation newlinetechnique improved spectral efficiency quality of service better integration with existing standards embedded security and an all IP network OFDM transmits large amount of digital data over the radio wave OFDM works by splitting the radio signal into multiple smaller sub signals and then transmitted simultaneously at different frequencies to the receiver Adaptive modulation based schemes like m ary PSK m ary QAM m ary newlineCPM and m ary MHPM system in Multi Carrier Code Division Multiple Access and Orthogonal Frequency Division Multiple Access system incorporated with 1 2 rate Turbo encoder and 1 3 rate Turbo encoder was designed for the user rate of up to 32 numbers The simulation results were taken up in Rayleigh fading channel using Matlab newlineand Simulink software newline newline