Pseudo Chaotic Sequence Generator based DS-SS Communication System using FPGA

Spread spectrum (SS) technology is a data transfer technique designed to overcome the interference problems associated with narrow-band very high frequency and ultra high frequency Data transfer systems. Spread spectrum communication is used to reduce jamming of communication signal and provides a highly secure communication. In this paper we specifies the Field Programmable Gate Array (FPGA) implementation of a baseband spread spectrum communication system using pseudo-chaotic sequences (PCS) for spreading digital data.The sequence generator and the DS-SS (Direct Sequence Spread Spectrum) for a single user is implemented in FPGA as a prototype. The generated pseudo-chaotic sequences are investigated for autocorrelation, cross correlation and balance properties. The Bit error rate (BER) performance of the system is evaluated in multi-user environment under AWGN and reveal that the DS-SS system using pseudo-chaotic sequences as spreading sequences significantly outperforms the conventional PN sequences. Keywords— digital communication, spread spectrum, pseudonoise,chaos, chaotic sequence generator.