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 19 of 19 for “"Channel Characterization"”.
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Wideband Channel Characterization for MIMO Scenario
… broadband wireless systems benefit from accurate channel characterization, there is growing interest in broadband wireless multiple-input multiple-output (MIMO) channel models. This thesis verifies the suitability of the Saleh Valenzuela with Angle (SVA) model for wideband MIMO communication …
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Non-stationary Vehicle-to-Vehicle Channel Characterization
… growing steadily over the past decade. The V2V channel differs significantly from classic cellular wireless channels specifically in its relatively low transmitter (Tx) and receiver (Rx) antenna heights, and that both Tx and Rx and some significant scatterers are all mobile. Given the dynamic …
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3.5 GHz Indoor Propagation Modeling and Channel Characterization
… shortage of propagation data and accurate channel modeling at 3.5 GHz in indoor environments. These models are necessary for cellular coverage planning and evaluating the performance and feasibility of wireless systems. This report presents the results of a fixed wireless channel …
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RF channel characterization for cognitive radio using support vector machines
… space resides in the spectrum, herein called RF Channel Characterization. Since previous research into the use of Machine Learning Algorithms for this task has focused on Neural Networks and Genetic Algorithms, this research will focus on the use of Machine Learning Algorithms that follow the …
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Analysis of acoustic communication channel characterization data in the surf zone
A channel characterization experiment for the underwater acoustic communication channel was carried out at Scripps Pier in May 1999. The experiment investigated acoustic transmission in very shallow water and breaking waves. In analyzing the data, several questions arose. The majority of the …
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Measurement Based Channel Characterization and Modeling for Vehicle-to-Vehicle Communications
… rely upon the properties of the propagation channel. Therefore, understanding the properties of the propagation channel becomes extremely important. This thesis aims to fill some gaps of knowledge in V2V channel research by addressing four different topics. The first topic is channel …
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Analysis of acoustic communication channel characterization data in the surf zone
Thesis (S.M. in Electrical Engineering)--Joint Program in Oceanography and Oceanographic Engineering (Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and the Woods Hole Oceanographic Institution), 2000.
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Characterization and Evaluation of Non-Line-of-Sight Paths for Fixed Broadband Wireless Communications
Channel impulse responses collected on the Virginia Tech campus show combinations of specular multipath and diffuse scattering at LMDS frequencies. An algorithm is presented that estimates link performance based on the channel impulse response. Presented and analyzed are representative impulse …
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Characterization of Ultra Wideband Communication Channels
… by characterizing the UWB communication channels. Channel characterization refers to extracting the channel parameters from measured data. The extracted parameters are used to quantify the effect of the channel on communication UWB systems using this channel as signal transmission medium. …
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Terrestrial radio wave propagation at millimeter-wave frequencies
… millimeter-wave frequencies. A measurement based channel characterization approach is taken in the investigation. First, measurement techniques are analyzed. Three types of measurement systems are designed, and implemented in measurement campaigns: a narrowband measurement system, a wideband …
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Localization Of Sensors In Presence Of Fading And Mobility
… to the PLE. The objective is to characterize the channel in order to derive accurate distance estimates from RSS measurements and then utilize the distance estimates in locating the sensors. To characterize the channel, two techniques are presented for the mobile anchors to periodically estimate …
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Channel Sounding for D-Band Measurements
… communication potential in 6G. However, numerous channel sounding measurements must be collected to properly support channel models for this region. The work detailed in this thesis aims to address this current research areas, with three main contributions: (1) detailing a flexible software define …
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A Study of Indoor Ultra-wideband Propagation Measurement and Characterization
… in indoor environments and develop accurate channel models. This thesis focuses primarily on a frequency-domain approach for propagation measurements and characterization of indoor UWB channels. This approach is based on measurements of the amplitude using a scalar network analyzer and …
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Adaptive antenna systems for mobile broadband communications
… and characterizes the multipath fading channels of mobile broadband systems. In particular, we consider antenna systems for the base station, as well as multiple-input multiple-output systems where antenna systems are utilized at both the base station and the mobile unit. It is proved …
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Data reliability and error correction for NAND Flash Memory System
… demand soft decisions while NAND flash memory channel provides hard-decisions only. Extracting the soft information requires the accurate characterization of flash memory channel and the effective design of coding schemes. To this end, we have presented a novel LDPC-TCM coding scheme for the …
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Graph-theoretic channel modeling and topology control protocols for wireless sensor networks
… research problems: (i) It presents a wireless channel model that reduces the complexity associated with high order Markov chains; and (ii) presents energy efficient topology control protocols which provide reliability while maintaining the topology in an energy efficient manner. For the above …
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Doctoral Thesis: Massive MIMO in Real Propagation Environments
… investigations are mainly based on theoretical channels with independent and identically distributed (i.i.d.) Gaussian coefficients, and sometimes assuming unlimited number of antennas. When bringing this new technology from theory to practice, it is important to understand massive MIMO behavior …
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The Impact of Signal Bandwidth on Indoor Wireless Systems in Dense Multipath Environments
… power also increases. In addition, accurate channel estimation is required to realize this performance, which becomes increasingly difficult as energy is dispersed among more multipath components. In this thesis we quantify the channel response for six signal bandwidths ranging from …
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Contribution to the characterization and evaluation of multiple antenna systems for communications: prototyping, propagation and antenna perspective
… spatial diversity offered by the radio channel has been proposed as an alternate method of great interest to be exploited. Advances in signal processing platforms have improved the computational capacities in digital signal processing, opening new options for signal processing for …