Title :
On improved multiuser detection with iterated soft decision interference cancellation
Author :
Lampe, Alexander ; Huber, Johonnes B.
Author_Institution :
Lehrstuhl fur Nachrichtentech. II, Erlangen-Nurnberg Univ., Germany
Abstract :
We present an iterated soft decision interference cancellation scheme (ISDIC) for multiuser detection applying a bank of adapted MMSE filters instead of matched filters. It is shown that in this way the performance of ISDIC for synchronous CDMA can be significantly improved. This includes a lower SER for a given transmit energy per bit and a considerable reduction in the number of required iterations. Next, considering transmission over an AWGN channel as well as a Rayleigh fading channel we show that the corresponding single user bounds can be achieved even in a fully loaded multiuser system with randomly chosen spreading sequences and without any user sorting according to fading amplitudes
Keywords :
AWGN channels; Rayleigh channels; adaptive signal detection; channel bank filters; error statistics; filtering theory; interference suppression; iterative methods; least mean squares methods; multiuser channels; radio links; spread spectrum communication; AWGN channel; ISDIC; Rayleigh fading channel; SER; adapted MMSE filter bank; baseband transmission model; fully loaded multiuser system; iterated soft decision interference cancellation; multiuser detection; randomly chosen spreading sequences; single user bounds; symbol error rate; synchronous CDMA; transmit energy per bit; uplink; AWGN channels; Baseband; Code division multiplexing; Fading; Filter bank; Interference cancellation; Matched filters; Multiaccess communication; Multiuser detection; Rayleigh channels;
Conference_Titel :
Communication Theory Mini-Conference, 1999
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5653-5
DOI :
10.1109/CTMC.1999.790259
