The evolution path of 4G networks: FDD or TDD?

Frequency-division duplexing and time-division duplexing are two common duplexing methods used in various wireless systems. However, there are advantages and technical issues associated with them. In this article we discuss in detail the features, and the design and implementation challenges of FDD...

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Bibliographic Details
Published in:IEEE communications magazine 2006-12, Vol.44 (12), p.42-50
Main Authors: C. Chan, Peter W., Lo, Ernest S., Wang, Ray R., S. Au, Edward K., N. Lau, Vincent K., Cheng, Roger S., Mow, Wai Ho, Murch, Ross D., Letaief, Khaled Ben
Format: Magazinearticle
Language:English
Subjects:
Automatic repeat request
Base stations
Cellular communication
Channel state information
Channels
Degradation
Design engineering
Downlink
Evolution
Flexibility
Frequency
Interference
Networks
Quantitative analysis
Quantization
State feedback
Transmitters
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Summary:Frequency-division duplexing and time-division duplexing are two common duplexing methods used in various wireless systems. However, there are advantages and technical issues associated with them. In this article we discuss in detail the features, and the design and implementation challenges of FDD and TDD systems for 4G wireless systems. In particular, we present a number of advantages and flexibilities an TDD system can bring to 4G systems that an FDD system cannot offer, and identify the major challenges, including cross-slot interference, in applying TDD in practice. Due to the fact that cross-slot interference is one of the critical challenges to employing TDD in cellular networks, we also provide a quantitative analysis on its impact on co-channel and adjacent channel interfering cells
ISSN:0163-6804
1558-1896
DOI:10.1109/MCOM.2006.273098