Capacity improvement with a multihop access scheme in broadband CDMA cellular systems

Abstract

AbstractThe use of multihop connection, in which a station in between the mobile station and the base station performs hopping relay of the transmission, in CDMA cellular systems should expand the area coverage and reduce the transmitted power per hop. There is a possibility that interference power may be reduced and that system capacity may be enlarged by this approach. Depending on the method of application, however, the system capacity may be decreased due to the interference during hopping. In this study, a basic investigation of interference reduction by multihop connection is first presented. Then, a procedure for selection of the hop stations with a strong capability for reducing the interference power is proposed. Considering a multicellular environment with a CDMA (code division multiple access) cellular scheme, the characteristics of multihop connections are evaluated by computer simulation, assuming packet access. It is shown that multihop connection has the effect of improving system capacity. © 2003 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 86(10): 17–24, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.10185