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 105 for “"rake"”.
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Compact Rake Boundary Layer Data System Module
… programming, and evaluation of the BLDS-M-RAKE, the newest addition to the family of devices called the Boundary Layer Data System (BLDS). The BLDS-M-RAKE is a continuation of the BLDS-M series of devices, a modular approach with updated electronics for boundary layer measurements. The …
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A multistage RAKE receiver for CDMA systems
This thesis proposes a multistage RAKE receiver for use at the base station of a Code Division Multiple Access (CDMA) cellular communications system. This receiver combines the interference rejection capability of multiuser receivers with the robust performance of a RAKE receiver in the presence of …
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Pre-equalization for pre-Rake MISO DS-UWB systems
… to resolve dense multipath components and use Rake combining at the receiver in order to significantly reduce the negative effects of fading. However, implementing a Rake receiver with a sufficiently large number of fingers to make use of this advantage is an evident challenge for most UWB …
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Area and Power Conscious Rake Receiver Design for Third Generation WCDMA Systems
A rake receiver, which resolves multipath signals corrupted by a fading channel, is the most complex and power consuming block of a modem chip. Therefore, it is essential to design a rake receiver be efficient in hardware and power. We investigated a design of a rake receiver for the WCDMA …
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Study of effect of speed, feed, and tool rake angle in machining plastics
Call number: LD2668 .T4 1963 M49
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Study of effect of speed, feed, and tool rake angle in machining plastics
Call number: LD2668 .T4 1963 M49
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The Performance of Direct-Sequence Spread-Spectrum Communications With Selective Fading Channels and Rake Reception
… is evaluated for selective fading channels and rake reception. Several issues are examined that influence the probability of error of the system, and closed-form expressions are obtained for the probability of error. The development of these expressions and the use of a general class of channel …
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Quantification of the boundary layer ingestion benet for the D8-series aircraft using a pressure rake system
… and downstream of the propulsor using a rotating rake system for the two configurations. The BLI benefit, defined as the mechanical flow power saving at cruise conditions (zero net streamwise force), from the BLI configuration relative to the non-BLI configuration, was found to be 8.2% +/- 0:8%. …
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Smart Antennas at Handsets for the 3G Wideband CDMA Systems and Adaptive Low-Power Rake Combining Schemes
… minimum selection GSC (MS-GSC) and an adaptive rake combining scheme to reduce the power consumption of mobile rake receivers. The proposed MS-GSC selects a minimum number of branches as long as the combined SNR is maintained larger than a given threshold. The proposed adaptive rake combining …
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Development of the BASS rake acoustic current sensor : measuring velocity in the continental shelf wave bottom boundary layer
… and field use of a new instrument, the BASS Rake, designed to measure velocity profiles in the wave boundary layer. The mechanical design supports multiple measurement levels with millimeter vertical spacing. The mechanical design is integrated with an electronic interface designed to permit …
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Development of the BASS rake acoustic current sensor : measuring velocity in the continental shelf wave bottom boundary layer
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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A fully numerical lifting line method for the design of heavily loaded marine propellers with rake and skew
This thesis aims to give a contribution to the design of heavily loaded marine propellers by numerical methods. In this work, a wake-adapted, fully numerical, lifting line model is used to obtain the optimum circulation distribution along the propeller's blade via variational method, presented by …
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Space-time Processsing for the Wideband-CDMA System
… system. Combining the antenna array with a RAKE receiver, both of which exploits multipath diversity, can significantly improve the system performance. In this research, we investigate the performance of these beamformer-RAKE receivers, also known as two-dimensional (2-D) RAKE receiver, for …
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Channel shortening equalizers for UWB receiver design simplification
… diversity, a UWB receiver usually incorporates Rake reception. Each multipath in the channel carries just a fraction of the signal energy. This phenomenon dictates a Rake receiver with a large number of fingers to achieve good energy capture and output signal to noise ratio (SNR). Eventually, …
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Investigating components of prospective cognition in gibbons (<i>Hylobatidae</i>)
… to the functionally relevant features of two rakes. One functional and one non-functional rake were presented during a raking in task, requiring selection of a functional rake in order to draw in an out of reach food reward. Pilot testing provided little support for this ability; however, …
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Space Time Processing for Third Generation CDMA Systems
… simpler technique termed as a Beamformer-Rake. In a Beamformer-Rake, the output of a beamformer is fed into a succeeding temporal processor to take advantage of both the beamformer and Rake receiver. Wireless service providers throughout the world are working to introduce the third …
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Loblolly Pine (Pinus taeda L.) Plantation Response to Mechanical Site Preparation in the South Carolina and Georgia Piedmont
… Chop/Burn, Shear/Disc, Shear/V-Blade, Shear/Rake, and Shear/Rake/Pile. Research was conducted to address the following objectives: (i) compare rotation-age forest response to several intensive site preparation treatments used to establish pine plantations in the Piedmont of the southeastern …
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Particleboard simulation model to improve machined surface quality
… occurs in the chip formation zone. At large rake angles, the chip is modeled as a transversely loaded beam that can fail by cleavage at its base or tensile failure on its surface. At small rake angles, the chip is modeled as the resultant force acting on the plane from the tool tip through to …
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The Impact of Signal Bandwidth on Indoor Wireless Systems in Dense Multipath Environments
… bandwidth is increased, the complexity of a Rake receiver (or other receiver structure) required to capture the available power also increases. In addition, accurate channel estimation is required to realize this performance, which becomes increasingly difficult as energy is dispersed among …
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