%0 Journal Article %T Performance Improvement of Multi-UserMC-CDMA system Using Discrete Hartly Transform Mapper %J Engineering and Technology Journal %I University of Technology-Iraq %Z 1681-6900 %A T. Shaheen, Ali %D 2013 %\ 06/01/2013 %V 31 %N 9 %P 1674-1691 %! Performance Improvement of Multi-UserMC-CDMA system Using Discrete Hartly Transform Mapper %K discrete Hartley transform %K Hartley Mapper %K CDMA %R 10.30684/etj.2013.82182 %X Future wireless communication systems must be able to accommodate a large number of users and simultaneously to provide the high data rates at the required quality of service. In this paper a method is proposed to perform the N-Discrete Hartley Transform (N-DHT) mapper, which are equivalent to 4-Quadrature Amplitude Modulation (QAM), 16-QAM, 64-QAM, 256-QAM, … etc. in spectral efficiency. The N-DHT mapper is chosen in the Multi Carrier Code Division Multiple Access (MC-CDMA) structure to serve as a data mapper instead of the conventional data mapping techniques like QPSK and QAM schemes. The proposed system is simulated using MATLAB and compared with conventional MC-CDMA for Additive White Gaussian Noise, flat, and multi-path selective fading channels. Simulation results are provided to demonstrate that the proposed system improves the BER performance and reduce the constellation energy as compared with the conventional system %U https://etj.uotechnology.edu.iq/article_82182_9ae48a2b797e8befc55ae7721a22948e.pdf