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

fYear

1999

fDate

6-10 Jun 1999

Firstpage

172

Lastpage

176

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Theory Mini-Conference, 1999

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-5653-5

Type

conf

DOI

10.1109/CTMC.1999.790259

Filename

790259