DSSS-DRMC BASED SECURE TRANSMISSION WITH FPGA IMPLEMENTATION

In Direct Sequence Spread Spectrum (DSSS), the information signal is denoted by a spreading signal over a band that is much larger than the original bandwidth, the main advantage of DSSS technique is to provide more security to the transmitted signal. In this paper, new structures are proposed and implemented to enhance transmission's security over traditional DSSS, while the Field Programmable Gate Array (FPGA) implementation of DSSS-based communication system is considered. The proposed techniques used different random multiple codes (DRMC) in DSSS, the spreading code with the size of 11 bits is used as single, double and triple bits sequence. The MATLAB-based simulated results of DSSSDRMC show that the spreading and modulated signals look like noise. The standard DSSS system with baseband transmission is implemented in FPGA hardware using System Generator, Vivado 2017.4, NEXYS 4 DDR board with ARTIX 7 XC7A100T. The device utilization results show that the DSP % used in single bit DSSS is 23.75%, while the bounded IO is 20.48%.