| Paper: | SPCOM-P11.7 | ||
| Session: | CDMA and Spread-Spectrum Systems | ||
| Time: | Friday, May 21, 09:30 - 11:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: Multiuser Detection and Signal Separation | ||
| Title: | A HYBRID SIC/PIC DETECTOR BASED ON A REDUCED NETWORK OF KALMAN FILTERS FOR DS-CDMA SYSTEMS OVER MULTIPATH FADING CHANNELS | ||
| Authors: | Bessem Sayadi; CNRS-SUPELEC | ||
| Sylvie Marcos; LSS-Supelec-Universite Paris-Sud | |||
| Abstract: | A Network of Kalman Filters (NKF)-based detector has recently been proposed or joint Multiple Access Interference (MAI) and Inter-Symbols Interference(ISI) compensation in DS-CDMA systems [1][2][3]. It is based on asymbol state space representation of the DS-CDMA system. The NKF-baseddetector presents an exponential complexity in term of the Kalman filters($Q^K$ where $Q$ represents the number ofpoints in the symbol constellation and $K$ represents the number of activeusers in the system). In thispaper, we propose to linearize the number of Kalman filters used in theaformentioned structure by combining a hybrid SIC/PIC structure and areduced Network of Kalman Filters-based on a reduced state spacerepresentation of the DS-CDMA system. Theproposed structure involves two steps. Thefirst, called \textit{forward} step, decodes the users in a serialapproach using a SIC structure.The second, called \textit{backward} step, is based on a hybridSIC/PIC structure in order to produce better estimates of the transmittedsymbols. The new resulting structure based on a reduced\textit{forward}-\textit{backward} NKF detector employs $2(K-1)Q$ Kalmanfilters. It exhibits better performances than the well knownexisting SIC-RAKE receiver especially in channels with a large delay spread. | ||
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