Investigation of OFDM system enhancement by using DS SS system over wireless mobile radio channel

Abstract EN

Wireless digital communication is rapidly expanding resulting in a demand for systems that are reliable and have a high spectral efficiency.

In this work, an OFDM based system has been studied, since it is a good candidate for future wireless services.

The combination of direct sequence spread spectrum (DS / SS) with OFDM system was proposed to enhance the performance of system.

The designed OFDM system operates at high-speed datarate over Jadingchannel, with cyclic prefix and, zero padded, to preserve the carriers orthogonality. The simulation results are presented for a simulated Rayleigh fading channel.

The simulation process includes a comparison between single carrier system, OFDM system, DS / SS system, and the proposed DS / SS / OFDM.

The results show the signal performance enhancement of OFDM system by using the proposed system.