Dynamic time-division-duplex wireless local loop

Junsong Li, Shayan Farahvash, Mohsen Kavehrad, Reinaldo Valenzuela

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


There are many benefits in using time division duplex (TDD) instead of frequency division duplex (FDD) schemes in fixed wireless cellular systems. To name a few; channel reciprocity for a single carrier frequency used on both up and down-links 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 down-link transmissions in other cells. Simulation results show in D-TDD cellular systems, performance is unacceptable, when omni-directional 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)1078-1085
Number of pages8
JournalIEEE Vehicular Technology Conference
Issue number52 ND
StatePublished - 2000
Event52nd Vehicular Technology Conference (IEEE VTS Fall VTC2000) - Boston, MA, USA
Duration: Sep 24 2000Sep 28 2000

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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