Title :
Precoded Block-Spread CDMA with Maximum User Support and Frequency-Domain Equalization
Author_Institution :
Toshiba Telecommun. Res. Lab., Bristol
Abstract :
Block-spread code-division multiple access (BS- CDMA) is a bandwidth efficient method by which multiple users can utilize a transmission medium simultaneously. One special property of BS-CDMA transmissions is that they facilitate the use of low-complexity frequency-domain equalization (FDE) at the receiver. Recently, it was shown that this property can only be preserved for multi-user interference (MUI) free reception when the number of simultaneously transmitting users does not exceed [M/2], where M is the length of the block spreading code. In this paper, a novel BS-CDMA technique is presented whereby user-specific preceding is employed along with special spreading codes to ensure MUI-free reception for M simultaneous users, while preserving the properties of the transmission that facilitate FDE at the receiver.
Keywords :
block codes; code division multiple access; equalisers; interference (signal); technical support services; CDMA; code-division multiple access; frequency-domain equalization; multi-user interference; precoded block-spread; user support; Bandwidth; Communications Society; Costs; Dispersion; Interference; Multiaccess communication; Quadrature phase shift keying; Transmitters;
Conference_Titel :
Communications, 2007. ICC '07. IEEE International Conference on
Conference_Location :
Glasgow
Print_ISBN :
1-4244-0353-7
DOI :
10.1109/ICC.2007.672