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 20 of 31 for “"MIMO Channels"”.
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Design of optimal equalizers and precoders for MIMO channels
… a method of combating ISI and ICI for high speed MIMO data communication systems. This dissertation focuses on optimal channel equalization in the presence of non-white observation noises with unknown PSD but bounded power-norm. A worst-case approach to optimal design of channel equalizers leads …
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Performance Analysis of Space-Time Coded Modulation Techniques using GBSB-MIMO Channel Models
… wire line networks. To support these services, channels with large capacities are required. Information theoretic investigations have shown that Multiple Input Multiple Output (MIMO) channels can achieve very high capacities. Space-Time Block Coding (STBC) and Bell Labs Layered Space-Time …
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Iterative detection for overloaded OFDMA with spatial diversity
… simulation with randomly generated multipath MIMO channels. From the results we determine the tradeoffs of algorithm complexity with performance and the effect of channel correlation on the supportable user load. Our MMSE algorithm with soft interference cancellation is observed to closely …
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Combined Space-Time Diversity and Interference Cancellation for MIMO Wireless Systems
… of multiple-input and multiple-output (MIMO) channels to enhance the capacity of wireless systems. In this study, we develop and evaluate a channel model, evaluate the corresponding channel capacity, and design and analyze a simple orthogonal transmit waveform for MIMO channels in mobile …
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VT-STAR design and implementation of a test bed for differential space-time block coding and MIMO channel measurements
… provided by the multiple input multiple output (MIMO) channels, significantly increasing both system capacity and the reliability of the wireless link. The Virginia Tech Space-Time Advanced Radio (VT-STAR) system presents a test bed to demonstrate the capabilities of space-time coding techniques …
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Data retrieval in MIMO systems and the effects of correlation on the channel capacity
Multiple-input multiple-output (MIMO) antenna design as used in communication is today, easily the most important field in the wireless field; as capacities of data are increased based on the inherent capability of the technology, without an increase in spectrum bandwidth.This thesis analyses the …
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Sparse nonlinear optimization for signal processing and communications
… equalization in multiple-input multiple-output (MIMO) underwater acoustic (UWA) communications, respectively.</p> <p>For NEC, the proposed two proportionate affine projection sign algorithms (APSAs) utilize the sparse nature of the network impulse response (NIR). Benefiting from the …
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Sparse equalizer filter design for multi-path channels
… equalizers are designed for sparse multi-path channels under a pre-defined Mean Squared Error (MSE) constraint. We start by examining the intrinsic sparsity of the Zero Forcing equalizers and the FIR Minimum MSE (MMSE) equalizers. Next the equalization MSE is formulated as a quadratic function …
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Communication Strategies for Single-User and Multiuser Slow Fading Channels
… diversity techniques for slow-fading wireless channels. There are two parts to this thesis: In Part I we propose spatial diversity techniques for point-to-point single-user wireless systems, while in Part II we propose multiuser cooperative diversity techniques for multiuser wireless …
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Optimal Detection with Imperfect Channel Estimation for Wireless Communications
… systems transmitting data through unknown fading channels, traditional detection techniques are based on channel estimation (e.g., by using pilot signals), and then treating the estimates as perfect in a minimum distance detector. In this thesis, we derive and investigate an optimal detector that …
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Investigation of Indoor Propagation Algorithms for Localization Purposes: Simulation and Measurements of Indoor Propagation Algorithms for Localization Applications using Wall Correction Factors, Local Mean Power Estimation and Ray Tracing Validations
… fading mechanisms are explored. The concept of MIMO channels is studied using many types of deterministic channel modelling such as Finite Difference Time Domain, Ray tracing and Dominant path model. A comprehensive study on estimating local average of the received signal strength (RSS) for …
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Advanced Multiple-Input and Multiple Output Technology in Wireless Communication Networks
… of a multiple-input and multiple-output (MIMO) channel can increase linearly with the number of antennas. However, besides deploying multiple antennas at base stations, there are many challenges to develop MIMO to further boost the wireless network capacity. In this thesis, advanced MIMO …
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On the MIMO Capacity with Multiple Power Constraints
Themultiple-inputmultiple-output(MIMO)technology has become an essential element of modern communication systems e.g.,3G,4 Gand massive MIMOtechnology has been recently standardized i n3GPPRel-15i.e. ,New Radio(NR)to enhance the spectral efficiency or the capacity of 5G networks. Given a digital …
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Multi-layered Space Frequency Time Codes
… 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 consists of a space time code. …
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Capacity-approaching data transmission in MIMO broadcast channels
… distributed multiple input and multiple output (MIMO) channels. There are three major results in this dissertation. First, it is shown that over a MIMO Gaussian broadcast channel, and under channel-aware scheduling, open-loop transmit antenna diversity actually reduces the achievable sum rate. …
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Performance investigation of spatial modulation systems under realistic channel models
… such as the multiple-input-multiple-output (MIMO) have widely been used to improve the link reliability and capacity of wireless communication systems. In recent years, a new MIMO technology named the spatial modulation (SM) has attracted signi cant research interest due to its reported …
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Fast blind adaptive equalisation for multiuser CDMA systems
… multiuser equalisation over frequency selective channels. A robust pilot-assisted equalisation strategy is developed for the partially loaded time division duplex (TDD) component of the universal mobile telecommunications system (UMTS). In addition to training-based equalisation performed using …
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