Thesis multiuser detector decorrelator

Rasmussen and Teng Joon Lim Abstract—Parallel interference cancellation PIC is a promis- By selecting mutually orthogonal codes for all users, the ing detection technique for code-division multiple access CDMA conventional matched-filter detector achieves single-user per- systems. It has previously been shown that the weighted multistage PIC can be seen as an implementation of the formance for each user. It is however not possible to main- steepest descent algorithm used to minimise the mean squared tain orthogonality in a mobile environment, hence the mul- error MSE. Following this interpretation, a unique set of tiple access interference MAI that results may degrade weights, based on the eigenvalues of the correlation matrix, was found to lead to the minimum achievable MSE for a the performance of a CDMA system severely.

Thesis multiuser detector decorrelator

Catalogue record for this book is available from the Library of Congress. Printed in the Netherlands. A historical overview of multiuser communications.

Continuous time linear multiple-access channel. Sampling of the modulation waveform. The modulation vectors sk [i]. Structure of the cross-correlation matrix.

Symbol synchronous single-user correlation detection for antipodal modulation.

Mohammad Saquib: Ph.D. Thesis Abstract

Modulating waveform built from chip waveforms. Multiple transmit and receive antennas. Satellite spot beam up-link. Example of a discrete memoryless multiple-access channel.

Two-user achievable rate region. Three-user achievable rate region. Two-user binary adder channel. Convex hull of two achievable rate regions for the two-user binary adder channel.

Capacity region of the two-user binary adder channel. Capacity region of the two-user binary multiplier channel. Example of Gaussian multiple-access channel capacity region. Rates achievable with orthogonal multiple-access.

Convergence of spectral density. Random sequence capacity with Rayleigh fading. Rates achieved by some existing codes for the BAC. Combined 2 user trellis for the BAC. Two user nonlinear trellis code for the BAC.

Successive cancellation approach to achieve vertex of capacity region. Two-user MAC with perfect feedback. Capacity region for the two-user binary adder channel with feedback. Simple feedback scheme for the binary adder channel.

Channel seen by V. Capacity region for the two-user GMAC channel with feedback.

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Capacity region for symbol-asynchronous two-user Gaussian multiple-access channel. Capacity region for two-user collision channel without feedback.

Illustrated is the merger at state s, where each of the path arrives with the metric 4. Compare with Figure 4. Compare with Figures 4. The algorithm starts at point A.On Multipath Spatial Diversity in Wireless Multiuser Communications Haley M.

Jones B.E. (Hons.), (Adelaide) December A thesis submitted for the degree of Doctor of Philosophy of The Australian National University Department of Telecommunications Engineering Research School of Information Sciences and Engineering The Australian.

M. Nicoli, Multiuser Reduced Rank Receivers for TD/CDMA Systems. In the past few years the number of users of wireless communication systems has been growing expo-nentially.

Thesis multiuser detector decorrelator

For this reason increasing system capacity is a critical issue, especially for next generation cellular systems. Browsing by Department "Dept. of Electronic and Information Engineering" a software simulation package to study the near-far resistant property of the decorrelator type of asynchronous multiuser detector where four simultaneous users under the multipath fading conditions.

Moreover, this dissertation also presents the decorrelator to handle. filter based systems as well as decorrelator based multiuser detection systems. We consider both flat and frequency-selective multipath fading channels. Mult iuser Detect ion in Fading Channels Using the EM Algorithm Andrew W..

Adaptations of the EM-based multiuser detector for RayIeigh and Rician fading channels are also presented, Plot of the ratio of decorrelator BER and single user BER versus SNR.

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