Smart antenna based OVSF code assignment for WCDMA networks

KAVAK A., Karakoc M.

WIRELESS PERSONAL COMMUNICATIONS, vol.43, no.4, pp.1761-1766, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 4
  • Publication Date: 2007
  • Doi Number: 10.1007/s11277-007-9343-7
  • Journal Name: WIRELESS PERSONAL COMMUNICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1761-1766
  • Kocaeli University Affiliated: Yes

Abstract

This paper presents a new method for dynamic allocation of orthogonal variable spreading factor (OVSF) codes in WCDMA networks where each base station is equipped with an adaptive antenna array (AAA). Previous works about OVSF code assignment problem deal with the code limitedcase. Here, we investigate the feasibility to turn the problem into the SIR limited case. With our scheme, the new call request is allocated an OVSF code that may be currently used by an active user whose downlink beam has the smallest spatial correlation with the channel vector of the requesting user, as long as desired SIR level is achieved. The performance of the new scheme is justified through computer simulations under different traffic load conditions.