Europhys. Lett., 76 (6), pp. 1193-1199 (2006)
DOI: 10.1209/epl/i2006-10380-5

Analysis of CDMA systems that are characterized by eigenvalue spectrum

K. Takeda¹, S. Uda² and Y. Kabashima<sup>1

1</sup>  Department of Computational Intelligence and Systems Science Tokyo Institute of Technology - Yokohama 2268502, Japan
²  The Institute of Japanese Union Scientists & Enginners 5-10-11 Sendagaya, Shibuyaku, Tokyo 1510051, Japan

received 11 July 2006; accepted in final form 19 October 2006
published online 16 November 2006

Abstract
An approach to analyze the performance of the code division multiple access (CDMA) scheme, which is a core technology used in modern wireless communication systems, is provided. The approach characterizes the objective system by the eigenvalue spectrum of a cross-correlation matrix composed of signature sequences used in CDMA communication, which enable us to handle a wider class of CDMA systems beyond the basic model reported by Tanaka in Europhys. Lett., 54 (2001) 540. The utility of the scheme is shown by analyzing a system in which the generation of signature sequences is designed for enhancing the orthogonality.

PACS
84.40.Ua - Telecommunications: signal transmission and processing; communication satellites.
75.10.Nr - Spin-glass and other random models.
89.70.+c - Information theory and communication theory.

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