Performance analysis of RAKE receiver in W‐CDMA downlink

Abstract

Abstract In this paper, we theoretically analyze the received signal performance during reception by a RAKE receiver at the terminal in wideband DS‐CDMA (W‐CDMA: wideband code division multiple access) downlink and evaluate the characteristics by a simulation. This theoretical analysis considers the long code and Walsh code used in the W‐CDMA downlink, signal transmission to many users, and transmission beamforming at the base station. We derive an exact solution of the signal‐to‐interference‐plus‐noise ratio (SINR) after RAKE reception at the terminal. In this process, the interference signals exhibit correlation between the RAKE fingers of the terminal in the W‐CDMA downlink. The simulation verifies the derived SINR equation. In addition, we evaluate the signal characteristics of the RAKE reception at the terminal in a fading environment and discuss the differences from the theoretical values. © 2002 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 86(1): 24–37, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecja.10037