TY - JOUR
T1 - Dynamic TDD and fixed cellular networks
AU - Li, Junsong
AU - Farahvash, Shayan
AU - Kavehrad, Mohsen
AU - Valenzuela, Reinaldo
N1 - Funding Information:
Manuscript received November 3, 1999. The associate editor coordinating the review of this letter and approving it for publication was Prof. C. Georghiades. This work was supported by the National Science Foundation under Grant CCR-9902846, by Lucent Technologies Inc. and by CICTR.
PY - 2000/7
Y1 - 2000/7
N2 - 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 antenna is used at base stations. Simulation results have also demonstrated a great potential for smart antennas in fixed D-TDD bandwidth-on-demand wireless systems.
AB - 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 antenna is used at base stations. Simulation results have also demonstrated a great potential for smart antennas in fixed D-TDD bandwidth-on-demand wireless systems.
UR - http://www.scopus.com/inward/record.url?scp=0034228574&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034228574&partnerID=8YFLogxK
U2 - 10.1109/4234.852920
DO - 10.1109/4234.852920
M3 - Article
AN - SCOPUS:0034228574
VL - 4
SP - 218
EP - 220
JO - IEEE Communications Letters
JF - IEEE Communications Letters
SN - 1089-7798
IS - 7
ER -