FPGA Implementation of MC-CDMA for High Security Applications

Abstract

The demand of wireless communications is increased in high speed, high security applications like missile communication, satellite communication etc. The communication with these features can be achieved by using different carrier modulation techniques like single carrier, multi carrier modulation etc. The multi carrier modulation with orthogonality of carriers provides high speed communication. This process is called Orthogonal Frequency Division Multiplexing (OFDM). The high speed and band width utilization can be achieved by using OFDM. The high security communication can be achieved by using coders and spreaders with different random generator sequences with the help of Spread Spectrum techniques. This can be done by using a method called Code Division Multiple Access (CDMA). The Multi Carrier CDMA is defined by adding the features of OFDM and CDMA and this is used for high speed and high secured communication system. The MC-CDMA uses convolution coder, viterbi decoder and spreader, de spreader etc to provide security. The MC-CDMA technique consists of a back to back connected transmitter and receiver with 8-point FFT/IFFT and QPSK modulation. This technique is designed by using Verilog HDL with Xilinx ISE Design suite 12.4 version tool. The design is implemented in Xilinx virtex-5 XUPV5LX110T FPGA board.