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Enhanced architecture for residue number system-based CDMA for high-rate data transmission

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2 Author(s)
Madhukumar, A.S. ; Sch. of Comput. Eng., Nanyang Technol. Univ., Singapore, Singapore ; Chin, F.

This paper presents an advanced architecture for residue number system (RNS)-based code-division multiple-access (CDMA) system for high-rate data transmission by combining RNS representation, phase shift keying/quadrature amplitude modulation (PSK/QAM) and orthogonal modulation. The residues obtained from a fixed number of bits are again divided into spread code index and data symbol for modulation. The modulated data symbol is spread using the indexed orthogonal codes and transmitted through a communication channel. The proposed system uses a lower number of orthogonal codes than conventional RNS-based CDMA and the performance is comparable. The computational complexity of the proposed system is compared against alternative schemes such as M-ary CDMA and conventional RNS-based CDMA. The modified system is simulated extensively for different channel conditions and the results are discussed.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:3 ,  Issue: 5 )

Date of Publication:

Sept. 2004

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