An investigation on capacity versus guard-bands in the TDD mode of UMTS

Harald Haas, Steve McLaughlin, Gordon J R Povey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


The UMTS terrestrial radio access (UTRA) is composed of a frequency division duplex (UTRA-FDD) mode and a time division duplex (UTRA-TDD) mode. In UTRA-TDD the uplink and downlink are on the same carrier frequency This creates additional interference scenarios, to be precise: MS <----> MS and BS <----> BS interference. Since power leakage between adjacent carriers cannot be avoided this inherent property of TDD has an impact on adjacent channel interference (ACI) and thus on cell capacity. The power leakage results from transmitter mask imperfections and non-ideal receiver filters. From interference power measurements using a 7th and a 9th order butterworth receiver filter the relationship between carrier spacing and adjacent channel interference power ratio (ACIR) is established. This relationship is used to find the best carrier spacing in UTRA-TDD considering several cell deployment scenarios. It is found that the ACIR must be greater than 30 dB, but the capacity gains from an ACIR greater than 40 dB converge rapidly.

Original languageEnglish
Title of host publication52nd IEEE Vehicular Technology Conference, 2000
Number of pages5
ISBN (Print)0-7803-6507-0
Publication statusPublished - 2000
Event52nd IEEE Vehicular Technology Conference - Boston, United States
Duration: 24 Sept 200028 Sept 2000


Conference52nd IEEE Vehicular Technology Conference
Abbreviated titleVTC 2000-Fall
Country/TerritoryUnited States


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