Title :
Downlink Site Selection Transmit Diversity with Power Allocation for a 2-Dimensional Block Spread DS-CDMA Cellular System
Author :
Liu, L. ; Adachi, Fumiyuki
Author_Institution :
Dept. of Electr. & Commun. Eng., Tohoku Univ.
Abstract :
2D block spread direct sequence-code division multiple access (DS-CDMA) allows multi-rate/multi-connection without causing downlink multi-access interference (MAI) in the presence of a frequency-selective fading channel. However, in a cellular system, the inter-cell interference remains. The site selection diversity transmission (SSDT) can be used to reduce the inter-cell interference and increase the downlink capacity. In this paper, we show that if adaptive power allocation is applied, where the BS allocates different power levels to different users according to their channel conditions, 2D block spread DS-CDMA with SSDT provides larger downlink capacity than the conventional DS-CDMA with SSDT.
Keywords :
code division multiple access; fading channels; 2D block spread DS-CDMA cellular system; direct sequence-code division multiple access; downlink site selection transmit diversity; frequency-selective fading channel; multi-access interference; power allocation; site selection diversity transmission; Communications Society; Downlink; Filters; Multiaccess communication; Multiple access interference; Multiuser detection; Power control; Power engineering and energy; Signal to noise ratio; Transmitters;
Conference_Titel :
Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE
Conference_Location :
Kowloon
Print_ISBN :
1-4244-0658-7
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2007.377
