Title :
A review of time division duplex-CDMA techniques
Author :
Povey, Gordon J R ; Nakagawa, Masao
Author_Institution :
Edinburgh Univ., UK
Abstract :
The basic concepts of a time division duplex system are introduced. The advantages of using TDD-CDMA for mobile radio communications is shown to be related to its ability to handle asymmetric data and benefits resulting from the reciprocal nature of the channel. Synchronisation difficulties and the associated interference problems are seen as the primary limiting factors. The use of TDD-CDMA in UMTS is highlighted and the proposal for sharing FDD bandwidth allocations with the TDD system is explained and outage problems are identified
Keywords :
cellular radio; code division multiple access; diversity reception; radiofrequency interference; synchronisation; FDD bandwidth allocations sharing; UMTS; asymmetric data; cellular radio; interference problems; mobile radio communications; outage problems; pre-RAKE diversity; space diversity; synchronisation; time division duplex system; time division duplex-CDMA techniques; 3G mobile communication; Bandwidth; Channel allocation; Downlink; Frequency synchronization; Land mobile radio; Land mobile radio cellular systems; Mobile communication; Multiaccess communication; Telecommunication standards;
Conference_Titel :
Spread Spectrum Techniques and Applications, 1998. Proceedings., 1998 IEEE 5th International Symposium on
Conference_Location :
Sun City
Print_ISBN :
0-7803-4281-X
DOI :
10.1109/ISSSTA.1998.723862
