Title :
On the impact of soft decision functions on the performance of multistage parallel interference cancelers for CDMA systems
Author :
Irmer, Ralf ; Nahler, Achim ; Fettweis, Gerhard
Author_Institution :
Technische Univ. Dresden, Germany
Abstract :
Since CDMA systems in multipath environments suffer from multiple access interference (MAI) multiuser detection (MUD) schemes are used in the receivers. Parallel interference cancellation (PIC) is an iterative nonlinear method to combat MAI with good performance and relatively low computational complexity, which is crucial for practical implementation. In this paper the decision function for the symbol estimates between these PIC stages is investigated for a multi-carrier spread-spectrum frequency code division multiple access (MC-SS FCDMA) system. Monte-Carlo simulations show the impact of the decision-function on the performance for several parameters
Keywords :
Monte Carlo methods; code division multiple access; decision theory; interference suppression; iterative methods; multipath channels; multiuser channels; parameter estimation; radio receivers; radiofrequency interference; signal detection; spread spectrum communication; CDMA systems; MAI MUD schemes; MC-SS FCDMA system; MonteCarlo simulations; computational complexity; iterative nonlinear method; multi-carrier spread-spectrum frequency code division multiple access; multipath environments; multiple access interference multiuser detection schemes; multistage parallel interference cancelers; parallel interference cancellation; receivers; soft decision functions; symbol estimates; AWGN; Concurrent computing; Frequency conversion; Frequency estimation; Interference cancellation; Iterative methods; Multiaccess communication; Multiple access interference; Multiuser detection; Spread spectrum communication;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944640
