Dynamic time-division-duplex wireless local loop

Author

Li, Junsong ; Farahvash, S. ; Kavehrad, Mohsen ; Valenzuela, Reinaldo

Author_Institution

Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA

Volume

3

fYear

2000

fDate

2000

Firstpage

1078

Abstract

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-link 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 up-link in any cell caused by down-link transmissions in other cells. Simulation results show in D-TDD cellular systems, performance is unacceptable, when an 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

Keywords

adaptive antenna arrays; cellular radio; multiuser channels; radio access networks; radio links; radiofrequency interference; time division multiple access; RF; TDMA; bandwidth-on-demand wireless systems; base stations; channel reciprocity; channel state information; down-link; dynamic TDD wireless local loop; dynamic traffic; dynamic-TDD; fixed wireless cellular systems; frequency plan; interference; omni-directional antenna; performance; reduced RF design complexity; simulation results; single carrier frequency; smart antennas; time-division-duplex; up-link; Bandwidth; Base stations; Channel state information; Communications technology; Downlink; Frequency conversion; GSM; Interference; Radio frequency; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd

Conference_Location

Boston, MA

ISSN

1090-3038

Print_ISBN

0-7803-6507-0

Type

conf

DOI

10.1109/VETECF.2000.886273

Filename

886273