IJIMT 2018 Vol.9(6): 278-284 ISSN: 2010-0248
doi: 10.18178/ijimt.2018.9.6.825

A New Generation of OFCDMA Based on Innovative Integration Techniques

Ahmed Hassan Mansour, Mona Zakria Saleh, and Salwa H. ElRamly
Abstract— Orthogonal Frequency Code Division Multiple Access (OFCDMA) system is one of the most promising multi-user wireless communications systems. It outperforms Orthogonal Frequency Division Multiplexing (OFDM) because of the utilization of two dimensional (2D) spreading. This paper proposes innovative integration techniques with OFCDMA system for better data rate increase and Bit Error Rate (BER) performance enhancement. The paper is divided into two parts; integration techniques that target improvement in the downlink transmission, and the other part targets the uplink transmission improvement. In the downlink, the proposed system represents an integration of Multiple–Input Multiple Output (MIMO) and OFCDMA systems through the usage of Space Time Spreading (STS) and OFCDMA. This exploits transmit diversity needed for BER enhancing and data rate boosting. Further BER improvement was achieved through applying an effective Iterative Interference Cancellation (IIC) algorithm at the receiver. In the uplink, A MIMO-OFCDMA system based on new set of codes called Complete Complementary Codes (CCC) is proposed. The authors present an analytical analysis for the proposed systems performance in addition to simulation results. The proposed systems attained better BER performance compared to Single-Input Single-Output (SISO) OFCDMA systems and the OFCDMA system that use the traditional codes. The achieved BER performance was very close to Maximal Ratio Receive Combining (MRRC) diversity system with 1Tx and 4Rx. A considerable improvement was also obtained by increasing the number of IIC iteration loops.

Index Terms— 5G, CCC, MIMO, OFCDMA, spatial diversity (STS).

Ahmed Hassan Mansour is with the Arab Organization for Industrialization, Cairo, Egypt (e-mail: ahmedha@ aav.com.eg). Mona Zakria Saleh and Salwa H. ElRamly are with the Electronics and communications Engineering Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt (e-mail: monazsaleh@gmail.com, salwa_elramly@eng.asu.edu.eg).


Cite: Ahmed Hassan Mansour, Mona Zakria Saleh, and Salwa H. ElRamly, " A New Generation of OFCDMA Based on Innovative Integration Techniques," International Journal of Innovation, Management and Technology vol. 9, no. 6, pp. 278-284, 2018.

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