Design and FPGA realization of MC-CDMA system using pseudo chaotic sequence generator

A novel chaotic spreading sequences for Multi-carrier code division multiple access (MC-CDMA) system is proposed. DS-CDMA is a type of spread-spectrum communication system in which multiple signal channels occupy the same frequency band, been distinguished by the use of different spreading codes. Implementation of Multi carrier CDMA transmitter and receiver using pseudo chaotic sequences for spreading digital data using Field Programmable Gate Array (FPGA) has been proposed in this paper. The generated pseudo-chaotic sequences are investigated for auto-correlation, cross-correlation and balance properties. The Bit error rate (BER) performance of the system is evaluated in multi-user environment under AWGN channel and reveals that the MC-CDMA system using pseudo-chaotic sequences as spreading sequences significantly outperforms the conventional PN sequences.