A Fast Blind Multiple Access Interference Reduction in DS/CDMA Systems Based on Adaptive Projected Subgradient Method

• CAVALCANTE Renato L. G.

  Department of Communications and Integrated Systems, Tokyo Institute of Technology

• YAMADA Isao

  Department of Communications and Integrated Systems, Tokyo Institute of Technology

• SAKANIWA Kohichi

  Department of Communications and Integrated Systems, Tokyo Institute of Technology

Abstract

This paper presents a novel blind multiple access interference (MAI) suppression filter in DS/CDMA systems. The filter is adaptively updated by parallel projections onto a series of convex sets. These sets are defined based on the received signal as well as a priori knowledge about the desired user's signature. In order to achieve fast convergence and good performance at steady state, the adaptive projected subgradient method (Yamada et al., 2003) is applied. The proposed scheme also jointly estimates the desired signal amplitude and the filter coefficients based on an approximation of an EM type algorithm, following the original idea proposed by Park and Doherty, 1997. Simulation results highlight the fast convergence behavior and good performance at steady state of the proposed scheme.

Journal

• IEICE Trans. on Fundamentals, A

  IEICE Trans. on Fundamentals, A 87 (8), 1973-1980, 2004-08-01

  The Institute of Electronics, Information and Communication Engineers

Keywords

• DS
• CDMA
• multiple access interference (MAI)
• adaptive projected subgradient method
• interference suppression
• blind detection

Details

• CRID: 1571698602418850944
• NII Article ID: 110003213128
• NII Book ID: AA10826239
• ISSN: 09168508
• Text Lang: en
• Data Source:
  • CiNii Articles