Title :
Vector groupwise interference cancellation in multi-rate DS-CDMA systems
Author :
Pedersen, Klaus I. ; Mogensen, Preben E.
Author_Institution :
Center for Person Kommunikation, Aalborg Univ., Denmark
Abstract :
A concatenated receiver structure is proposed, where an antenna array is used to form a simple spatial filter which provides protection against fast fading and spatial white interference and noise. Subsequently, a multiuser detector (MUD) is applied, which cancels the residual interference from the dominant high bit rate users. Low bit rate users are not considered in the MUD. A decision directed MUD is implemented, where a new adaptive scheme for reducing the cost of wrong interference estimates is proposed. Simulation results indicate that such a structure provides a significant gain of 69% in throughput when implemented for UMTS
Keywords :
adaptive signal detection; antenna arrays; array signal processing; code division multiple access; fading channels; filtering theory; interference suppression; land mobile radio; radio receivers; radiofrequency interference; spread spectrum communication; UMTS; adaptive signal detection; antenna array; antenna array processing; concatenated receiver structure; decision directed MUD; fast fading; high bit rate users; interference estimates; low bit rate users; multi-rate DS-CDMA systems; multiuser detection; multiuser detector; noise; residual interference; simulation results; spatial filter; spatial white interference; throughput; vector groupwise interference cancellation; Antenna arrays; Bit rate; Concatenated codes; Fading; Interference cancellation; Multiaccess communication; Multiuser detection; Protection; Receiving antennas; Spatial filters;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851225
