Adaptive Multiplexing Technique for Mobile Networks based on SNR

Adaptive multiplexing techniques are used in wireless upcoming and new access systems to meet requirements of high data rates according to channel condition. As number of mobile users are expanding gradually and multimedia demand is also increasing among the mobile users, so now it becomes important to increase the data rates. Multi-carrier code division multiple access (MC-CDMA) and Orthogonal frequency division multiplexing (OFDM) systems are achieved a lot of attraction of researchers as both systems in wireless communication have great ability of providing high data rates. As both systems have ability to overcome many impairments of wireless channel. As both systems are multicarrier, so performance of system in terms of overall system capacity and BER can efficiently and effectively be enhance by using adaptive technique among OFDM and MC-CDMA. By using OFDM and MC-CDMA combination in a system with adaptive concept to get the more data rate efficiency is an effective way. In this paper, performance of adaptive system is analyzed. System is consisting of two sub system OFDM and MC-CDMA. First the OFDM and MC-CDMA performance is separately analyzed in terms of BER. Each system performance is analyzed over Rayleigh channel and AWGN channel by sending and receiving data in terms of BER. Then system is attached with adaptive system. The adaptive system is designed using switch cases between OFDM and MC-CDMA. The switching parameter is SNR of the channel.