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Controlling Intercell Interference in CDMA-based Fixed Wireless Networks Through Multirate Techniques

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Abstract

A number of research works have suggested a possible capacity advantage when employing direct sequence-code division multiple access (DS-CDMA) instead of the more common time division multiple access option for fixed broadband wireless access networks operating at millimeter-waves. The choice of this multiple access scheme, which, up to now, has not been foreseen by recent WiMax (worldwide interoperability for microwave access) standards, exhibits an improved performance in terms of cochannel interference in the upstream, even though it experiences higher interference in the downstream. The present paper focuses on enhancing the bottleneck downstream performance of fixed wireless networks by proposing a methodology for controlling the signal-to-interference ratio throughout the cell, so that all subscribers meet the given interference quality-of-service specifications. This is accomplished by exploiting the properties of a combination of multirate CDMA techniques. The paper describes a simple policy for code assignment, which is proved to be optimal, incorporating the effect of rain fading over multiple paths. The performance of the algorithm is tested against single code DS-CDMA both under long term channel statistics (static code assignment) and under dynamic channel effects (dynamic code assignment). The first test verifies the compliance of all sector subscribers with more demanding SIR specifications, while the second yields a significant improvement in terms of resource utilization.

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Authors and Affiliations

  1. Wireless & Satellite Communications Group, Division of Information Transmission Systems and Materials Technology, School of Electrical & Computer Engineering, National Technical University of Athens, Athens, 15780, Greece

    Pantelis-Daniel M. Arapoglou, Petros I. Papaioannou, Athanasios D. Panagopoulos & Panayotis G. Cottis

Authors
  1. Pantelis-Daniel M. Arapoglou
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  2. Petros I. Papaioannou
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  3. Athanasios D. Panagopoulos
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  4. Panayotis G. Cottis
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Corresponding author

Correspondence to Pantelis-Daniel M. Arapoglou.

Additional information

This work is supported by the Programme of the 8th Session of the joint Greek-Italian Scientific and Technological Co-Operation 2006–2008.

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Arapoglou, PD.M., Papaioannou, P.I., Panagopoulos, A.D. et al. Controlling Intercell Interference in CDMA-based Fixed Wireless Networks Through Multirate Techniques. Wireless Pers Commun 54, 729–744 (2010). https://doi.org/10.1007/s11277-009-9779-z

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  • DOI: https://doi.org/10.1007/s11277-009-9779-z

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