Welch bound analysis on generic code division multiple access codes with interference free windows

Authors:
Xiangming Li;Hsiao-Hwa Chen;Yi Qian;Bo Rong;Mohammad Reza Soleymani
Affiliations:
School of Information and Electronics Engineering, Beijing Institute of Technology, China;Department of Engineering Science, National Cheng Kung University, Tainan City, Taiwan;National Institute of Standards and Technology, Gaithersburg, MD;Department of Electrical Engineering, Ecole de Technologie Superieure, Universite du Quebec, Montreal, Canada;Department of Electrical and Computer Engineering, Concordia University, Canada
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

Code-division multiple access (CDMA) technology has been applied to many wireless communication systems. CDMA system suffers from both multiple access interference (MAI) and inter-symbol interference (ISI) over a multipath channel. To suppress MAI and ISI, this paper proposes the spreading codes with interference free windows. In particular, we will develop several upper bounds on the efficiency of generalized spreading codes (for both unitary and complementary codes) in terms of the width of their interference free windows.