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DESIGN AND SIMULATION OF PARALLEL CDMA SYSTEM BASED ON 3D-HADAMARD TRANSFORM | ||
| DIYALA JOURNAL OF ENGINEERING SCIENCES | ||
| Article 8, Volume 6, Issue 4, 2013, Pages 54-69 PDF (0 K) | ||
| Author | ||
| Ali T. Shaheen | ||
| Abstract | ||
| Future wireless systems aim to provide higher transmission data rates, improved spectral efficiency and greater capacity. In this paper a spectral efficient two dimensional (2-D) parallel code division multiple access (CDMA) system is proposed for generating and transmitting (2-D CDMA) symbols through 2-D Inter-Symbol Interference (ISI) channel to increase the transmission speed. The 3D-Hadamard matrix is used to generate the 2-D spreading codes required to spread the two-dimensional data for each user row wise and column wise. The quadrature amplitude modulation (QAM) is used as a data mapping technique due to the increased spectral efficiency offered. The new structure simulated using MATLAB and a comparison of performance for serial one-dimensional (1-D) CDMA and parallel (2-D) CDMA is made under Additive White Gaussian Noise (AWGN), flat fading and multi-path selective fading channels conditions. It is found that 2-D CDMA has better speed and performance than serial 1-D CDMA. | ||
| Keywords | ||
| CDMA; D Hadamard; D Spreading Codes; D CDMA; D ISI Channel | ||
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