Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 31 for “"multiuser detection"”.
-
Practical multiuser detection algorithms for CDMA
… aim of this thesis is to investigate practical multiuser demodulation algorithms for mobile communications systems that are based on code division multiple access (CDMA) technologies. These include the adaptive receiver and the interference canceller. The overall complexity of implementing them …
-
Multiuser Detection for Pulse Amplitude Modulated Signals
Multiuser Detection (MUD) receiver techniques leverage the signal structure of overlapping transmissions to reduce inter-user interference and improve system performance. One main application for MUD research has been reducing inter-user interference in Code-Division Multiple Access (CDMA) channels …
-
Adaptive iterative multiuser detection for wireless communication systems
… an adaptive receiver for multi-user symbol detection that operates in a low SINR (< 5 dB) region. Since the knowledge of channel-parameter estimates is unavailable at the receiver, a pilot (training) sequence is applied in the communication system, to learn the channel state information …
-
The application of multiuser detection to cellular CDMA
This research investigates the application of multiuser detection to Code Division Multiple Access for cellular communications. This investigation focuses on the use of multiuser receivers at the base station of mobile radio systems. The first two chapters are dedicated to multiuser detection in …
-
Multiuser detection for CDMA systems with convolutional coding
… It has been shown by previous research that multiuser detection receivers employing interference cancellation techniques can significantly improve the capacity of COMA systems. Error correction coding is also an important technique for overcoming severe channel degradation. In this project, …
-
Blind Channel Estimation and Multiuser Detection for Multi-Rate CDMA Communications
… Currently, the study on channel estimation and multiuser detection for multi-rate DS/CDMA, which makes full use of the nature of multi-rate signals, is still at its early stage. The thesis deals with the application of subspace-based techniques to blind channel estimation and multiuser detection …
-
Novel multiuser detection and multi-rate schemes for multi-carrier CDMA
… important issues for an MC-CDMA wireless system, multiuser detection and multi-rate access, are discussed in this dissertation. Several advanced receiver structures capable of suppressing multiuser interference in an uplink MC-CDMA system, operating in a frequency-selective fading channel, are …
-
Adaptive DS-CDMA multiuser detection for time variant frequency selective Rayleigh fading channel
… on the development of adaptive algorithms for multiuser detection (MUD) and interference suppression for wideband direct sequence code division multiple access (DS-CDMA) systems over time-variant frequency selective fading channels. In addition, channel acquisition and delay estimation …
-
Adaptive signal combining and detection in cooperative wireless networks
… research adaptive algorithms were developed for multiuser detection and signal combining in cooperative wireless networks. Some of the key contributions and works of this research thesis are: 1. A computationally simple Adaptive Minimum Mean Square Error Multiuser Detection scheme was proposed to …
-
Iterative detection for overloaded OFDMA with spatial diversity
… sophisticated multiple antenna receivers with multiuser detection methods are necessary. The focus of this thesis will be the formulation of an iterative multiple antenna receiver framework for overloaded uplink OFDMA systems. Specifically, we formulate optimal MAP and reduced complexity MMSE …
-
Techniques and adaptation algorithms for direct-sequence spread-spectrum CDMA single-user detection
… are two approaches to mitigating these problems: multiuser detection and single-user detection techniques. Multiuser detection techniques cancel the interference and enhance system capacity, but have large computational requirements and require the knowledge of MAI parameters. Single-user …
-
Computationally Efficient Multiuser and MIMO Detection based on Dichotomous Coordinate Descent Iterations
The detection in multiuser (MUD) and multiple-input multiple-output (MIMO) systems can increase the spectral efficiency, and therefore is of great interest. Although multiuser and MIMO detection is mature in theory, the real-time implementation is still an open issue. Many suboptimal detection …
-
On the performance and capacity of space-time block coded multicarrier CDMA communication systems
… the semi-blind channel estimation and linear multiuser detection are performed to recover the data at the receivers of base station
-
Efficient Interference Cancellation Techniques for Advanced DS-CDMA Receivers
… the study of advanced processing techniques for multiuser interference cancellation in direct sequence code division multiple access communications. Emphasis is placed on the development of efficient techniques that are practical to implement. The work begins with a study of several sub-optimal …
-
Receiver Implementations for a CDMA Cellular System
… receivers. Previous research has shown that multiuser detection receivers that employ interference cancellation techniques can significantly improve the capacity of a CDMA system. This thesis studies two such structures: the successive interference cancellation scheme and the parallel …
-
Combined Space-Time Diversity and Interference Cancellation for MIMO Wireless Systems
… antenna systems. Both adaptive beamforming and multiuser detection are evaluated for various signal waveforms over a variety of mobile radio channels.
-
Space-Time Codes for High Data Rate Wireless Communications
… combining concepts drawn from space-time coding, multiuser detection, array processing and iterative decoding.
-
Channel estimation and signal enhancement for DS-CDMA systems
… dissertation focuses on topics of Bayesian-based multiuser detection, space-time (S-T) transceiver design, and S-T channel parameter estimation for direct-sequence code-division multiple-access (DS-CDMA) systems. Using the Bayesian framework, various linear and simplified nonlinear multiuser …
-
Differential MMSE: A New Approach for Adaptive Interference Suppression Over Time-Varying Channels
… ranging from equalization to adaptive multiuser detection for direct sequence code division multiple access (CDMA) systems. A drawback of this method is that standard MMSE adaptation is unable to track the amplitude and phase variations typical of a wireless fading channel. A classical …
-
Non-orthogonal multiple access using guessing random additive noise decoding aided macrosymbols
… GRAND-AM is a NOMA method that uses both joint multiuser detection and joint error correction decoding to handle multiple access interference (MAI) from the users of interest. Our method avoids codebook design and iterative decoding techniques, which are associated with other commonly researched …
Page 1 of 2