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 49 for “"interference suppression"”.
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Interference suppression and diversity for CDMA systems
… multipath channels, the desired signal suffers interference from other users. Signal fading due to multipath propagation is another source of impairment in wireless CDMA systems, often severely impacting performance. In this dissertation, reduced-rank minimum mean square error (MMSE) receiver …
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Advanced Interference Suppression Techniques for Spread Spectrum Systems
… the performance of these systems is limited by interference. A number of different interference suppression techniques have been proposed, including multiuser detection, beamforming, adaptive supervised and blind algorithms, and transmit processing techniques requiring a limited feedback …
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Adaptive interference suppression algorithms for DS-UWB systems
… these parameters. In the DA scheme, the interference suppression task is fulfilled with only one adaptive filter in the frequency-domain and a new signal expression is adopted to simplify the design of such a filter. LMS, RLS and conjugate gradient (CG) adaptive algorithms are then …
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General Interference Suppression Technique For Diversity Wireless Rece
… and statistical signal processing for digital interference suppression in wireless receivers. The technique simplifies the analog front-end by eliminating the anti-aliasing filters and relaxing the requirements for IF bandpass filters and A/D converters. Like MIMO systems, multiple antenna …
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A Study of Interference Suppression Using Deep Learning Methods
… thesis investigates a Deep Learning model for interference suppression in wireless communications. By exploiting the structure of Convolutional Neural Network-based autoencoders, we develop an approach for interference suppression with no prior knowledge on characteristics or the exact location …
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Ultra-Wideband for Communications: Spatial Characteristics and Interference Suppression
Ultra-Wideband Communication is increasingly being considered as an attractive solution for high data rate short range wireless and position location applications. Knowledge of the statistical nature of the channel is necessary to design wireless systems that provide optimum performance. This …
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Improving Signal Clarity through Interference Suppression and Emergent Signal Detection
… that increase signal clarity: interferer suppression and emergent signal detection. Spatial processing is often used to suppress interferers that are spatially distinct from the signal of interest. If the signal of interest and the interferer are statistically independent, blind source …
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Unitary Space-Time Transmit Diversity for Multiple Antenna Self-Interference Suppression
… nulls in the signal pattern. The result of this interference pattern can be compared to the effect of fading in a multiple-input multiple-output (MIMO) multi-path scattering environment. Confidence in this comparison leads to the use of unitary space-time MIMO codes to overcome the signal …
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Space -Time Transmit Precoding and Interference Suppression for a Wireless Downlink
The first topic considered in the thesis is interference suppression using space-time transmit filters for a multiuser system, assuming perfect channel feedback. The filter design is formulated as an optimization problem, and an iterative algorithm that converges to the global optimum is derived. …
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Intercarrier Interference Suppression for the OFDM Systems in Time-Varying Multipath Fading Channels
… the subcarriers and leads to the intercarrier interference (ICI). ICI poses a significant limitation to the wireless OFDM systems. The aim of this dissertation is to find an efficient method of providing reliable communication using OFDM in the fast time-varying fading channel scenarios. First, …
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Differential MMSE: A New Approach for Adaptive Interference Suppression Over Time-Varying Channels
… adaptive receivers is a classical method for interference suppression, with applications 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 …
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Network lifetime extension, power conservation and interference suppression for next generation mobile wireless networks
… networks are network lifetime extension and interference suppression. In this dissertation, these two issues are addressed. In the area of interference suppression, a new family of projection multiuser detectors, based on a generalized, two-stage design is proposed. Projection multiuser …
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Energy-efficient coding and modulation methods for interference suppression in wireless sensor network systems
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Advanced MIMO-CDMA receiver for interference suppression: Algorithms, system-on-chip architectures and design methodology
… algorithms are required to suppress various interferences. However, the current hardware design architecture and methodology is falling far behind the requirements of small size, low cost and power consumption. System-On-Chip (SoC) architectures are a major revolution taking place in the …
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A Comprehensive Analysis of Deep Learning for Interference Suppression, Sample and Model Complexity in Wireless Systems
… wireless communication, resulting in persistent interference issues. Despite progress in addressing interference, it remains a challenge for effective spectrum usage, particularly in the use of license-free and managed shared bands and other opportunistic spectrum access solutions. Therefore, …
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Executive Functioning Component Processes and the Causes of Formal Thought Disorder in People With Schizophrenia
… of executive functioning: context memory and interference suppression. In two studies, one with people with schizophrenia and the other an analogue study with nonpsychiatric participants, context memory predicted FTD. In addition, in both studies, the effect of a context memory deficit was …
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Structural Monitoring With Fiber Bragg Grating Strain Sensor Array and Optical Frequency Domain Reflectometry
… system.In the second half of this work, a cavity interference suppression method is used to suppress interferences between fiber Bragg gratings. The cavity interference suppression method is simulated using two transfer matrices, after which, a practical design using a circular polarized source …
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Selective Interference Cancellation and Frame Synchronization for Packet Radio
… investigates the application of multiuser interference suppression to direct-sequence code-division multiple-access (DS-CDMA) for peer-to-peer packet radio networks. The emphasis of this work is to develop and validate efficient interference suppression techniques through selective …
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Discrete Wavelet Methods for Interference Mitigation: An Application To Radio Astronomy
… project makes use of wavelets to mitigate interference, and documents how wavelets are effective in the suppression of Radio Frequency Interference (RFI) in the context of radio astronomy. This study begins with the design of a library of smooth orthogonal wavelets well suited to …
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