An antenna weight control method of downlink for adaptive array antennas at base station in DS‐CDMA cellular system

The application of adaptive array antennas in wireless base stations in cellular mobile communication systems is studied to improve frequency utilization. Since the propagation path information differs in the uplink and the downlink in Frequency Division Duplex (FDD) where the carrier frequencies in the downlink and uplink differ, the method for generating the antenna weights for the downlink is an important topic of study. In this paper, we propose a method that measures the location of the mobile station via the uplink (direction and distance from the base station) and controls the antenna weights of the downlink based on that information. Then we clearly show the improvement in the receive CINR performance in the mobile station when the proposed method was applied to a DS-CDMA cellular system. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 89(2): 57–68, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20199

[1]  Hiroyuki Tsuji,et al.  A novel approach to mobile-terminal positioning using single array antenna in urban environments , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[2]  T. Fujii,et al.  A study on the measurement method of the mobile station location in wide-band mobile communications , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[3]  Nobuo Nakajima,et al.  The future generations of mobile communications based on broadband access technologies , 2000, IEEE Commun. Mag..

[4]  Ernst Bonek,et al.  A real-time DOA-based smart antenna processor , 2002, IEEE Trans. Veh. Technol..

[5]  Jan-Erik Porath.  Minimum distance bounding techniques for individual trellis codes , 1995, IEEE Trans. Commun..

[6]  A. Paulraj,et al.  Adaptive transmitting antenna arrays with feedback , 1994, IEEE Signal Processing Letters.