Europhys. Lett.
Volume 76, Number 6, December 2006
Page(s) 1193 - 1199
Section Interdisciplinary physics and related areas of science and technology
Published online 16 November 2006
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. Kabashima1

1  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

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.

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.

© EDP Sciences 2006