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 304 for “"beamforming"”.
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Microwave CMOS Beamforming Transmitters
The increase of the consumer electronics market the last couple of decades has been one of the main drivers of IC process technology development. The majority of the ICs are used in digital applications, and for these CMOS is the choice of technology. The urge to squeeze more transistors on to a …
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Broadband frequency-independent beamforming
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Beamforming for MC-CDMA
… different channel conditions. Frequency domain beamforming is studied in this research predominantly through simulation. As an alternative a time domain beamforming is also studied. Time variations in the channel can disrupt the orthogonality between subcarriers. Minimum Mean Square Error (MMSE) …
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Acoustic beamforming using microphone arrays
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Acoustic beamforming in reverberant environment
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Distributed beamforming in wireless sensor networks
… language to study the effectiveness of beamforming using sensor clusters for establishing a communication link to the UAV. Results showed that the antenna main lobe remained relatively unchanged in the presence of position errors and sensor node failures or when the density of the sensor …
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Vector modulators for analog-beamforming receivers
This work focuses on new architectures for analog-beamforming receivers. In recent years, the drive for wireless communication techniques that can accomodate more users, provide higher data rates, and facilitate more reliable connections has generated a great amount of interest in multiantenna …
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Antenna beamforming for infrastructureless wireless networks
Our work studies the impact of antenna beamforming on the performance of infrastructureless wireless networks. Based on examination of the beampattern for a uniform circular antenna array (UCAA) utilizing beamforming under a constraint on maximum average transmit power, we approximate achievable …
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Ein Beitrag zur Erweiterung von Beamforming-Methoden
… beruht i. A. auf dem Delay&Sum-Beamforming, deren Umsetzung im Zeit- oder Frequenzbereich erfolgt. Die Schwächen dieser Messtechnik bezüglich Ortsauflösung und Dynamik sowie akustisch schlechte Bedingungen erschweren die Interpretation akustischer Bilder und bieten Ansätze für …
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Codebook design for distributed relay beamforming system
… can be generated off-line with the Grassmannian beamforming criterion. Due to non-uniform distribution of the optimal beamforming vector in the vector space, The Lloyd’s algorithm is proposed for with-power-control codebook designs. To reduce search complexity, a suboptimal method for the …
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Array Processing Techniques for Broadband Acoustic Beamforming
… A microphone array used in conjunction with a beamforming algorithm can acquire and spatially filter the signal, but traditionally this has suffered from limitations similar to those of the purely acoustic designs. The work presented in this paper attempts to overcome these limitations by …
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Circuit Techniques for Multiple and Wideband Beamforming
… different architectures with regard to multiple beamforming and wideband phased array transceiver. Three different designs are implemented in TSMC 65nm RF CMOS to demonstrate different solutions. The design in this thesis have included major RF blocks in state-of-art wireless transceiver: RF …
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Development And Characterization Of Beamforming Antenna Systems
… dissertation discusses the development of the beamforming antenna systems as a scaled model for customized RFID systems. In this work, an Fabry-Perot Cavity (FPC) antenna system consisting of a single source and frequency selective surface (FSS) is proposed (chapter 2) and investigated. Since …
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Augmenting Wireless Security Using Zero-Forcing Beamforming
… simultaneous data streams using Zero-Forcing Beamforming (ZFBF). Instead of using this technique for simultaneous data stream generation, STROBE utilizes ZFBF by allowing an AP to use one stream to communicate with an intended user and the remaining streams to orthogonally "blind" (actively …
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Software Defined Radio For Hybrid Beamforming Applications
<p>Beamforming techniques have been deployed in both licensed networks such as LTE network and unlicensed network such as IEEE802.11ac WiFi. The scope of work for this thesis is to leverage the benefits of beamforming techniques and software defined radio platform in developing a fully functioning …
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Utilizing Beamforming Antennas for Wireless Multihop Networks
… processing and antenna technologies, smart beamforming antennas have become feasible at cheaper prices, making them an attractive replacement to omnidirectional antennas. With beamforming antennas, the ability to guide RF energy in desired directions can lead to higher spatial reuse of the …
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Sonar beamforming based upon monaural localisation techniques
Sonar beamforming is usually accomplished using a multi-element transducer array. To obtain high resolution, such a system is costly and complex. In contrast, many mammals are capable of good angular resolution using only a single active element surrounded by an irregular reflector – the ear. A …
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A multi-processor based digital beamforming system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
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A real-time adaptive-beamforming hearing aid
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Maximum likelihood time-domain beamforming using simulated annealing
An algorithm is developed for underwater acoustic signal processing with an array of hydrophones. With various acoustic signals coming from different directions, the maximum likelihood approach is used to estimate the source bearings and time series. Simulated annealing is used to implement the …
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