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Dynamic TDD Fixed Cellular Systems Using Smart and Sectored Antennas

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Abstract

There are many benefits in using time division duplex (TDD) instead of frequency division duplex (FDD) schemes in fixed wireless cellular systems. For example, channel reciprocity for a single carrier frequency used on both uplinks and downlinks will allow easy access to channel state information, reduced complexity of RF design, much higher flexibility in handling dynamic traffic, simpler frequency plan, etc. However, there exists a serious limiting factor in using dynamic TDD (D-TDD) in cellular systems. This is due to a steady interference on an uplink in any cell caused by downlink transmissions in other cells. Simulation results show in D-TDD cellular systems, performance is unacceptable, when an omnidirectional antenna is used at base stations. Simulation results also suggest great potential for smart antennas in achieving substantial performance improvement in fixed D-TDD bandwidth-on-demand wireless systems.

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Authors and Affiliations

  1. Center for Information and Communications Technology Research (CICTR), Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania, [16802-2701

    Junsong Li, Shayan Farahvash & Mohsen Kavehrad

  2. Lucent Technologies Inc., Bell Laboratories, 791 Holmdel-Keyport Rd., Holmdel, New Jersey, 07733-0400

    Reinaldo Valenzuela

Authors
  1. Junsong Li
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  2. Shayan Farahvash
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  3. Mohsen Kavehrad
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  4. Reinaldo Valenzuela
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Li, J., Farahvash, S., Kavehrad, M. et al. Dynamic TDD Fixed Cellular Systems Using Smart and Sectored Antennas. International Journal of Wireless Information Networks 9, 227–241 (2002). https://doi.org/10.1023/A:1021099812131

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  • DOI: https://doi.org/10.1023/A:1021099812131

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