Performance improvement of multi-user MC-CDMA system using discrete hartley transform mapper

Abstract EN

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 (MCCDMA) 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.