Performance Evaluation of Multiuser Detectors with V-BLAST to MIMO Channel

In this thesis, we evaluate the performance of multiuser detectors over an uplink using AWGN, Rayleigh flat fading single-input single-output (SISO) and multiple-input multiple-output (MIMO) channel models. First, we review the performance of three multiuser receivers; the decorrelator, the MMSE receiver and the multistage parallel interference cancellation receiver in an AWGN and Rayleigh flat fading SISO channel. Next, the V-BLAST algorithm is reviewed and the error propagation of this algorithm is investigated. Then, the V-BLAST algorithm is combined with multiuser receivers to achieve high channel capacity while sharing the spectral resources over a MIMO channel. A bias reduction technique is considered for multistage parallel interference cancellation receiver on both SISO and MIMO channel. Finally, the effect of channel estimation error and timing delay estimation error is evaluated for MIMO systems with multiple users. Acknowledgements I would like to express thanks to my advisor Dr. Brian D. Woerner for his invaluable advice and comments from deciding the thesis topic to revising the writing. His guidance and consistent encouragement allowed me complete this work. I am extremely impressed with his teaching, advising and generosity. I am deeply grateful to Dr. accepting to be on my thesis committee and for providing advice in and out of class. Thanks to Haesoo Kim and Kyehun Lee for helpful discussion and comments. I appreciate other VT faculty members, staffs and colleagues. Finally, I thank my parents for their support and endless love through my life.