TY - JOUR ID - 82182 TI - Performance Improvement of Multi-UserMC-CDMA system Using Discrete Hartly Transform Mapper JO - Engineering and Technology Journal JA - ETJ LA - en SN - 1681-6900 AU - T. Shaheen, Ali AD - Y1 - 2013 PY - 2013 VL - 31 IS - 9 SP - 1674 EP - 1691 KW - discrete Hartley transform KW - Hartley Mapper KW - CDMA DO - 10.30684/etj.2013.82182 N2 - 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 UR - https://etj.uotechnology.edu.iq/article_82182.html L1 - https://etj.uotechnology.edu.iq/article_82182_9ae48a2b797e8befc55ae7721a22948e.pdf ER -