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.
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Showing 1 to 13 of 13 for “"Multi-user Detection"”.
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A Structural Approach to Multi-User Detection
Multi-user detection focuses on the problem of demodulating the information symbols of multiple users sharing a common communication medium, e.g., a wireless communication system. An extensive literature currently exists on the various aspects of multi-user detection, including linear detection, …
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Multi-user detection for multi-rate DS/CDMA systems
… services motivate the need for handling multi-media traffic types. In a multimedia communication system, users with different and even time-varying rates and quality of services (QoS) requirements, such as voice, image and data, must be accommodated. The use of Spread Spectrum modulation …
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Reduced-complexity near-optimal Ant-Colony-aided multi-user detection for CDMA systems
… Ant-Colony Optimization (ACO) assisted Multi-User Detectors (MUDs) are proposed and investigated. The exhaustive search complexity of the optimal detection algorithm may be deemed excessive for practical applications. For example, a Space-Time Block Coded (STBC) two transmit assisted K = …
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Performance of adaptive admission\congestion control policies on a hybrid MC-CDMA\TDMA integrated multimedia networks
… to have the ability to accommodate variety of users, each with its own transmission characteristics and quality of service (QoS) requirements to be maintained. Compatible multi-access system should provide the means to control (i.e. admission congestion) the flow of traffic and at the same time …
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Blind Acquisition of Short Burst with Per-Survivor Processing (PSP)
… Coding, Overloaded Array Processing and Multi-User Detection. Per-Survivor Processing (PSP) is a technique for approximating MLSE for unknown channels by embedding channel estimation into the structure of the Viterbi Algorithm (VA). In the case of successful acquisition, the convergence …
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Data-Driven Physical-Layer Optimization for RF and Optical Communications: Transmitarray Metasurfaces, Contextual-Bandit MUD, and Coherent Optical Links
… own right, as problems in antenna design and in multi-user detection over time-variant channels; the third carries the methodology onto a coherent optical link, where size, weight, and power constraints make a small-satellite deployment the natural target.</p> <p>The antenna work targets a …
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Novel Approaches to Overloaded Array Processing
… performance of spatially reduced search joint detection (SRSJD) with the application of an energy focusing transform (EFT), a complexity reducing front-end linear pre-processor. A new type of EFT, the Energy Focusing Unitary Relaxed Transform (EFURT) is developed. This transform facilitates a …
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Multi-layered Space Frequency Time Codes
… dissertation focuses on three major advances on multiple-input multiple-output (MIMO) systems. The first studies and compares decoding algorithms for multi-layered space time coded (MLSTC) systems. These are single user systems that combine spatial multiplexing and transmit diversity. Each layer …
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Characterization of Ultra Wideband Communication Channels
… applications, particularly in short-range multiple access wireless communications. However, many important aspects of UWB-based communication systems have not yet been thoroughly investigated. The propagation of UWB signals in indoor environments is the single most important issue with …
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Adaptive DS-CDMA multiuser detection for time variant frequency selective Rayleigh fading channel
… which is based on direct sequence Code Division Multiple Access (DS-CDMA) technology, will not be able to meet the growing demands for multimedia service due to low information exchanging rate. Its capacity is also limited by multiple accessed interference (MAI) signals. This work focuses on the …
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Iterative receivers with channel estimation for MIMO and multi-user OFDM systems
… need to be efficiently used. The use of multiple antenna (MIMO) systems and iterative (turbo) receivers has significantly improved the realizable system performance. Still, many challenges exist in the development of efficient wireless receivers. In this thesis, which is written in the …
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High-Quality Detection in Heavy-Traffic Avionic Communication System Using Interference Cancellation Techniques
… focuses on quantifying the effects of multi-user co-channel interference for an avionic communication system operating in a heavy-traffic aeronautical mobile environment and proposes advanced interference cancellation techniques to mitigate the interference. The dissertation consists of …
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Long polyphase sequences for adaptive mmse detector in asynchronous cdma plc network with impulsive noise
… lo tanto, se deben emplear tecnicas de acceso multiple para dividir las senales de transmision, las cuales deben ser ortogonales entre si. Ademas de esto, la complejidad computacional del sistema, coste y consumo energetico deben tenerse en cuenta durante la fase de diseno. De modo que es …