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Development of a Multiuser Detection Testbed

Potman, J. (2002) Development of a Multiuser Detection Testbed.

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Abstract:A study on the practicality of DSP implementation of multiuser detection techniques for CDMA systems has been performed. This study was started with an evaluation of various multiuser detection techniques described in literature based on their bit-error-rate performance, required knowledge of received signal parameters and computational complexity. As a result of this evaluation the blind adaptive MMSE (Minimum Mean Square Error) detector and the PIC (Parallel Interference Cancellation) detector are found to be the most suitable detectors for implementation. Further analysis of these detectors lead to an adaptive algorithm for implementation of the blind adaptive MMSE detector and two methods for implementation of the PIC detector. The developed implementations for these detectors were tested for various CDMA system and detector parameters using simulations. Simulation results were also used to study the effect of detector parameters on detector performance and to compare the detectors to each other. The simulation results show that the bit-error-rate performance of the blind adaptive MMSE detector is superior to the conventional CDMA detector in perfect power control CDMA systems as well as CDMA systems that suffer from the near-far effect. The PIC detector has similar performance as the blind adaptive MMSE detector in perfect power control systems. In systems that suffer from the near-far effect the PIC detector does not perform well because of the amplitude estimation technique it uses. The blind adaptive MMSE detector has been chosen for DSP implementation, because of its better overall bit-error-rate performance and because no DSP implementation of the blind adaptive MMSE detector is known in literature. The developed DSP implementation of the blind adaptive MMSE detector has been used to evaluate the detected-bits-per-second performance that can be achieved by this detector on the current generation of DSPs.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering MSc (60353)
Link to this item:http://purl.utwente.nl/essays/56303
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