A mathematical scheme of multi-user receiver in W-CDMA mobile communication based on the conjugate gradient method

  • Authors:

  • Yumi Takizawa;Cindy Bernadeth Tjitrosoewarno;Atsushi Fukasawa

  • Affiliations:

  • Institute of Statistical Mathematics, Tokyo, Japan;Graduate School of Science and Technology, Chiba University, Chiba-shi, Chiba, Japan;Institute of Statistical Mathematics, Tokyo, Japan

  • Venue:
  • CONTROL'05 Proceedings of the 2005 WSEAS international conference on Dynamical systems and control
  • Year:
  • 2005

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Abstract

This paper describes a new scheme of multi-user receiver to improve the capacity of Wideband CDMA system. This scheme is obtained by applying Conjugate Gradient Method (CGM) based on mathematical approach. CGM gives an iterative solution of a large-scale matrix under multiple access interference environments. The relation between transmitted and received signal is represented by sparse matrix; which has diagonal components almost equal to one and other components approaching to 0. This matrix equation is expected to be solved effectively by using CGM. It is shown that the configuration is clearly simplified with equivalently increased capacity compared to the sequential configuration under single path and multi-path environment.