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Performance of cellular packet CDMA in an integrated voice/data network

  • Rajamani Ganesh
  • Kuriacose Joseph
  • Newman D. Wilson
  • Dipankar Raychaudhuri
Technical Papers

Abstract

This paper presents a simulation-based study of cellular packet CDMA systems operating in an integrated voice/data traffic scenario. Spread-spectrum CDMA provides a suitable framework for resource-shared packet transport capable of combining isochronous (voice, ISDN) and bursty data services. In this work, a general network model for cellular packet CDMA with mixed voice/data traffic is described and used to evaluate the capacity/performance impact of several key system parameters. First, the effect of spreading factor (N) and forward error correction (FEC) rate are studied, confirming earlier work indicating a weak dependence onN and a well-defined optimum code rate in the range of 0.5–0.7 (with BCH coding). Next, the effect of propagation loss coefficient (γ) on network capacity is investigated over a range of possible assumptions forγ, including both constant and distance-dependent models. The results show that system capacity depends strongly onγ, varying by as much as a factor of 2 over the range of parameters considered. For a given distance-dependentγ assumption, performance results are also obtained for different cell sizes in order to understand the overall spatial reuse efficiency achievable in different cellular and microcellular scenarios. This is followed by an investigation of traffic source model effects: first the capacity improvement from voice activity detection VAD) is presented, showing the expected ∼2∶1 gains. Results for varying proportions of voice and data traffic intensities indicate that the operating efficiency does not change significantly as the proportion of bursty data relative to voice is varied.

Key words

Cellular packet CDMA voice/data network spreading factor forward error correction propagation loss coefficient 

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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Rajamani Ganesh
    • 2
  • Kuriacose Joseph
    • 2
  • Newman D. Wilson
    • 2
  • Dipankar Raychaudhuri
    • 1
  1. 1.C&C Research LaboratoriesNEC USAPrinceton
  2. 2.David Sarnoff Research CenterPrinceton

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