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Investigation of OFDM System Enhancement by Using DS / SS System over Wireless Mobile Radio Channel | ||
| Engineering and Technology Journal | ||
| Volume 24, Issue 2, February 2005, Pages 172-184 PDF (1.6 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.30684/etj.24.2A.11 | ||
| Author | ||
| Wa'il Abdul - Hasan Hadi | ||
| Dep. of Electrical and Electronic Engineering University of Technology | ||
| Abstract | ||
| Abstract: 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 data rate over fading channel , 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 . | ||
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