Title :
Novel smart antennas for applying SDMA to cellular mobile communication systems
Author :
Cho, Keizo ; Takatori, Yasushi ; Komiya, Kazuhiro ; Nishimori, Kentaro ; MIZUNO, Hideki
Author_Institution :
Network Innovation Labs., NTT Corp., Tokyo, Japan
Abstract :
The popularization of mobile communication has necessitated efficient use of the radio spectrum. Space-division-multiple-access (SDMA), which enables several users to use the same communication channel simultaneously by forming individual radiation patterns for the users, is an attractive candidate to reuse the frequency spectrum efficiently. However, there still remain problems for applying SDMA to actual cellular systems. These problems are summarized. Then, as solutions to overcome the problems, a new smart antenna configuration comprising sub-arrays and utilizing a space time coding (STC) technique, and a new smart antenna system utilizing space and polarization control are proposed. The effectiveness of the proposed antennas is presented.
Keywords :
adaptive antenna arrays; antenna radiation patterns; array signal processing; cellular radio; electromagnetic wave polarisation; frequency allocation; space division multiple access; telecommunication channels; SDMA; cellular mobile communication; communication channel; frequency spectrum reuse; individual radiation patterns; polarization control; smart antennas; space time coding; space-division-multiple-access; Antenna radiation patterns; Antennas and propagation; Base stations; Cellular networks; Control systems; Downlink; Mobile antennas; Mobile communication; Multiaccess communication; Transmitting antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2002. IEEE
Print_ISBN :
0-7803-7330-8
DOI :
10.1109/APS.2002.1017068
