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 122 for “"multiuser"”.
-
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 …
-
Non-orthogonal random waveform based multiuser communications
… of non-orthogonal random waveform based multiuser communications, commencing from the underlying theory and providing the way to sophisticated applications. In Chapter 2, we introduce the general framework of non-orthogonal random waveform based multiuser communications, where we focus …
-
Multiuser Communications With Relaying and User Cooperation
In the remainder of the dissertation, the impact of relaying and user cooperation on downlink of wireless networks is investigated. Three two-user relay broadcast channels are studied from an information-theoretic viewpoint. These channels represent fundamental units of downlink systems that …
-
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 …
-
Fast blind adaptive equalisation for multiuser CDMA systems
… by inter-symbol interference (ISI) and multiuser access interference (MAI). In order to achieve this, adaptive filters are employed. A variety of adaptive schemes to remove ISI and MAI have been reported in the literature, some of which rely on training sequences, such as the Least Mean …
-
Adaptive iterative multiuser detection for wireless communication systems
… (RSC) or turbo-code through a spread-spectrum multiuser multiple-path channel, which are referred to as two-stage and three-stage systems respectively in this thesis. The following claims are made based on the findings of this thesis: 1. It is known that a receiver implementing DFE can mitigate …
-
Spatial -Temporal Multiuser Receivers for Cdma-Based Communications
Within this work, we first provide a tutorial to basic temporal CDMA receiver designs. Improved temporal interference cancellation techniques are then developed using a direct measure of bit estimate reliability in the cancellation stage. We then investigate several techniques for integrating …
-
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, …
-
Iterative Leakage-Based Precoding for Multiuser-MIMO Systems
… leakage-based precoding algorithm to practical multiuser-MIMO systems. We consider the effect of practical impairments including imperfect channel state information, transmit antenna correlation, and time-varying channels. Solutions are derived which improve performance of the algorithm with …
-
Design and performance of CDMA codes for multiuser communications
… are fixed power codes and are widely used in multiuser CDMA communications. Their popularity is due to the ease of implementation. Availability of these code sets is limited because of their generating kernels. Emerging radio applications like sensor networks or multiple service types in …
-
A channel-shortening multiuser detector for DS-CDMA systems
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
-
An FPGA-Based Multiuser Receiver Employing Parallel Interference Cancellation
… probability of error in the system. Numerous multiuser structures exist, each with varying degrees of complexity and performance. However, the size and complexity of these structures is large relative to a conventional receiver. This effort demonstrates a practical approach to implementing …
-
MSE-based Linear Transceiver Designs for Multiuser MIMO Wireless Communications
… dissertation designs linear transceivers for the multiuser downlink in multiple-input multiple-output (MIMO) systems. The designs rely on an uplink/downlink duality for the mean squared error (MSE) of each individual data stream. We first consider the design of transceivers assuming channel state …
-
Communication Strategies for Single-User and Multiuser Slow Fading Channels
… wireless systems, while in Part II we propose multiuser cooperative diversity techniques for multiuser wireless communication systems. In the first part, we propose a set of new wireless communication techniques for multiple-input, multiple-output (MIMO) channels over Rayleigh slow-fading …
-
Joint relay beamforming and transceiver processing in multiuser relay network
… relay beamforming and transceiver processing in multiuser relay network. First of all, we consider the scenario in which multiple source-to-destination (S-D) pairs intend to communicate with the help of multiple distributed amplify-and-forward (AF) relays. A rank-two beamforming Alamouti scheme …
-
Adaptive MMSE multiuser receivers in MIMO OFDM wireless communication systems
… combines the adaptive minimum mean square error multiuser receiver's scheme with prior information of the channel and interference cancelation in the spatial domain, achieves enhanced joint channel estimation and signal detection which makes the new technique effectively mobile. A mathematical …
-
A time and space sharing scheduler for multiuser parallel machines
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
Page 1 of 7