TY - JOUR
T1 - Dynamic TDD Fixed Cellular Systems Using Smart and Sectored Antennas
AU - Li, Junsong
AU - Farahvash, Shayan
AU - Kavehrad, Mohsen
AU - Valenzuela, Reinaldo
N1 - Funding Information:
This research was supported by the National Science Foundation Grant Number CCR-9902846, Lucent, and The Pennsylvania State University CICTR.
PY - 2002/10
Y1 - 2002/10
N2 - There are many benefits in using time division duplex (TDD) instead of frequency division duplex (FDD) schemes in fixed wireless cellular systems. For example, channel reciprocity for a single carrier frequency used on both uplinks 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 an uplink in any cell caused by downlink transmissions in other cells. Simulation results show in D-TDD cellular systems, performance is unacceptable, when an omnidirectional 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.
AB - There are many benefits in using time division duplex (TDD) instead of frequency division duplex (FDD) schemes in fixed wireless cellular systems. For example, channel reciprocity for a single carrier frequency used on both uplinks 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 an uplink in any cell caused by downlink transmissions in other cells. Simulation results show in D-TDD cellular systems, performance is unacceptable, when an omnidirectional 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.
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U2 - 10.1023/A:1021099812131
DO - 10.1023/A:1021099812131
M3 - Article
AN - SCOPUS:1942486699
SN - 1068-9605
VL - 9
SP - 227
EP - 241
JO - International Journal of Wireless Information Networks
JF - International Journal of Wireless Information Networks
IS - 4
ER -