Dynamic TDD Fixed Cellular Systems Using Smart and Sectored Antennas

Junsong Li, Shayan Farahvash, Mohsen Kavehrad, Reinaldo Valenzuela

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)227-241
Number of pages15
JournalInternational Journal of Wireless Information Networks
Issue number4
StatePublished - Oct 2002

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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