Dynamic TDD and fixed cellular networks

Author

Li, Junsong ; Farahvash, Shayan ; Kavehrad, Mohsen ; Valenzuela, Reinaldo

Author_Institution

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

Volume

4

Issue

7

fYear

2000

fDate

7/1/2000 12:00:00 AM

Firstpage

218

Lastpage

220

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 the single carrier frequency used on both up 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 uplinks in a cell, caused by downlink transmissions of other cells. Simulation results show in D-TDD cellular systems, performance is unacceptable, when omni-directional antennas are used at base stations. Simulation results have also demonstrated a great potential for smart antennas in fixed D-TDD bandwidth-on-demand wireless systems.

Keywords

adaptive antenna arrays; cellular radio; radiofrequency interference; time division multiplexing; RF design; bandwidth-on-demand wireless systems; channel reciprocity; channel state information; downlinks; dynamic TDD; dynamic traffic; fixed cellular networks; fixed wireless cellular systems; interference; omni-directional antennas; simulation results; single carrier frequency; smart antennas; time division duplex; uplinks; Bandwidth; Base stations; Channel state information; Downlink; Frequency conversion; Interference; Land mobile radio cellular systems; Radio frequency; Switches; Wireless cellular systems;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/4234.852920

Filename

852920