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 10 of 10 for “"transmit beamforming"”.
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Adaptive transmit beamforming for simultaneous transmit and receive
Simultaneous transmit and receive (STAR) is an important problem in the field of communications. Engineers have researched many different models and strategies that attempt to solve this problem. One such strategy is to place a transmit-side null at the receiver in order to decouple a system's …
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Improving the Capabilities of Swath Bathymetry Sidescan Using Transmit Beamforming and Pulse Coding
… angle variance in SBS systems. The second, transmit beamforming, and more specifically steering and shading, is shown to increase both acoustic power in the water and directivity of the transmitted acoustic radiation. The transmit beamforming benefits are achieved by making use of the …
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The Bi-directional Spatial Spectrum for MIMO Radar and Its Applications
… angle and elevation angle. On receiver arrays, beamforming is performed after reception of the data, allowing for many adaptive array processing algorithms to be employed. However, on transmitter arrays, up until recently pre-determined phase shifts had to applied to each transmitter element …
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Multiantenna Communications in the Presence of Feedback
… systems. Channel state information (CSI) at the transmitter end is often an essential requirement when one wishes to fully utilize the potential gain promised by multiantenna technology. This requirement has sparked enormous interest in the design of practical transmission schemes (most notably, …
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Joint uplink-downlink beamforming in multi-antenna relaying schemes
… thesis examines the problem of joint receive and transmit beamforming for a wireless network which consists of one relay node equipped with multiple antennas. The transmitter and the receiver are single antenna systems. The communication system consists of two phases. In the first phase the …
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Experimental Investigation Of Ultrawideband Wireless Systems: Waveform Generation, Propagation Estimation, And Dispersion Compensation
… paths they took in their propagation from the transmitter to the receiver. Although such challenges have been investigated to some extent, they have not been fully explored in connection with sophisticated transmit beamforming techniques in realistic multipath environments.</p> <p>The work …
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Feedback schemes in angular domain processing for MIMO antenna systems
Multiple transmit and multiple receive antenna (MIMO) systems provide an additional spatial dimension that yields a degree of freedom gain. The degree of freedom gain in MIMO systems allows for spatial multiplexing of multiple data streams onto the channel and an increase in the channel’s capacity …
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A POMDP framework for antenna selection and user scheduling in multi-user massive MIMO systems
… design a resource allocation policy for downlink transmit beamforming at a multi-antenna BS that is equipped with a massive number of antennas and only a limited number of RF chains. Considering that channels evolve according to a Markov process and that only partial CSI is available, we use a …
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Resilient Waveform Design for OFDM-MIMO Communication Systems
… many of the theoretical concepts learned from transmit beamforming and interference alignment (IA) in MIMO systems can be applied to the field of AJ and robust communications in the presence of jammers. We consider a realistic jamming scenario and provide a `receiver-only' and a transmitter …
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Improving Throughput and Efficiency for WLAN: Sounding, Grouping, Scheduling
… optimal sounding intervals exist for single user transmit beamforming (SU-TxBF) and MU-MIMO for given channel conditions. We design a low-complexity dynamic sounding approach that adjusts the sounding interval adaptively in real-time. Through our collected over-the-air channel measurements, we …