| Paper: | SPCOM-P13.7 | ||
| Session: | Broadcast Channels / Multi-User Detection | ||
| Time: | Friday, May 19, 16:30 - 18:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communication: Multi-rate, CDMA and spread spectrum communication | ||
| Title: | Integration of the Krylov Subspace Method in an Iterative Multi-User Detector for Time-Variant Channels | ||
| Authors: | Charlotte Dumard, Thomas Zemen, ftw. Forschungszentrum Telekommunikation Wien, Austria | ||
| Abstract: | Iterative multi-user detection and time-variant channel estimation in a multi-carrier (MC) code division multiple access (CDMA) uplink requires high computational complexity. This is mainly due to the linear minimum mean square error (LMMSE) filters that are used for multi-user detection and time-variant channel estimation. Krylov subspace methods allow for an efficient implementation of the LMMSE filter. We show that a suitable chosen starting value, exploiting the iterative receiver structure, allows for a further speedup of the Krylov method. We achieve a complexity reduction by more than one order of magnitude. The Krylov subspace method allows a parallelization of the computations of the multi-user detector, while keeping the receiver performance constant. Numerical simulation results for a fully loaded system with K=64 users are presented. | ||
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