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 53 for “"Multi-antenna"”.
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Adaptation For Multi-Antenna Systems
… while jointly configuring the MoDem, CoDec and multi-antenna scheme. This work consists of two parts, focusing on energy efficiency in the presence of unoccupied frequency bands and on spectrally efficient operation under static frequency assignment. Utilizing minimum Euclidean distances of …
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Efficient scheduling of multi-antenna broadcast systems
… the problem of efficiently scheduling users in a multi-antenna Gaussian broadcast channel with 1M transmit antennas and K independent receivers each with a single receive antenna. We first focus on a scenario with two transmit antennas and statistically identical users, and analyze the gap between …
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Transmitter precoding for multi-antenna multi-user communications
… motivate the design of low-power receivers. Multi-user interference drastically reduces the energy efficiency of wireless multi-user communications by introducing errors in the bits being detected at the receiver. Interference rejection algorithms and multiple antenna techniques can …
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Joint uplink-downlink beamforming in multi-antenna relaying schemes
… 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 transmitter sends the information symbol to the relay while in the second phase, the relay …
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Throughput and complexity tradeoffs in the multi-antenna downlink
This thesis considers the joint design of the multiplexing and scheduling of independent data streams for the Gaussian multiple-input multiple-output (MIMO) broadcast channel. It is well known that the use of multiple transmit antennas can greatly increase the capacity of the broadcast channel. …
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Protocols for multi-antenna ad-hoc wireless networking in interference environments
… First, 'channel stuffing' is achieved through multiple antennas that are used at the receiver to mitigate interference using Minimum-Mean-Squared-Error (MMSE) receivers, allowing network nodes to transmit simultaneously in interference limited environments. The protocol also supports the use of …
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Implementations of Multi-Antenna Systems in a USRP Based SDR using Simulink
… makes more sense. Additionally, the use of multi-antenna systems is becoming more and more common. In mid-2011, Mathworks released support for standard SISO (single input, single output) communications with the NI USRP (National Instruments Universal Software Radio Peripheral) but has yet to …
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Multi-antenna relay network beamforming design for multiuser peer-to-peer communications.
In this work, we consider a multi-user peer-to-peer relay network with multiple multiantenna relays which employ amplify-and-forward relaying protocol. Assuming distributed relay beamforming strategy, we investigate the design of each relay processing matrix to minimize the per-antenna relay power …
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Modeling and calculation of the specific absorption rate for multi-antenna mobile devices
… many of which require the integration of multiple transmitting/receiving antennas into the limited space of the device. Since each radio antenna exposes the user to some level of electromagnetic radiation, if several radios are operating concurrently, the total exposure could be …
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A low-complexity linear and iterative receiver architecture for multi-antenna communication systems
Multi-antenna systems have been shown to significantly improve channel capacity in wireless environments. The focus of this thesis is on the design of low-complexity multi-antenna receiver architectures for communication networks and their demonstration in a real-time wireless environment. Our …
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Application of Machine Learning to Multi Antenna Transmission and Machine Type Resource Allocation
… of the transmit chain - from modulation to antenna mapping with a neural network. Similarly, the receiver/decoder is also replaced with a neural network. In other words, the first part of this work focuses on jointly optimizing the transmit and receive blocks to produce a set of space-time …
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A Ray-Based Investigation of the Statistical Characteristics and Efficient Representation of Multi-Antenna Communication Channels
<p>Multi-antenna communication systems are attracting research interest as a means to increase the information capacity, reliability, and spectral efficiency of wireless information transfer. Ray-tracing methods predict the behavior of wireless channels using a model of the propagation environment …
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Real Time Signal Processing for Multi-Antenna Systems and experimental Verification on a reconfigurable Hardware Test-bed
… zu Antennendiversität und zum räumlichen Multiplexing. Wir vergleichen verschiedene Übertragungsverfahren bezüglich der gemessenen Bitfehlerrate und des erreichten Datendurchsatzes mit adaptivem Bitladen unter Verwendung von linearen und nicht-linearen Detektionsverfah-ren. Des weiteren …
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3.5 GHz Indoor Propagation Modeling and Channel Characterization
… combined with delay spread characteristics for multipath analysis. The statistical multi-antenna diversity gain was evaluated to gauge the benefit of using multi-antenna systems in an indoor environment, which has much greater spatial diversity than an outdoor environment. Measurements were …
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30 GHz Switchable Waveguide Antenna: Prototype Antenna Solution for 60 GHz Wi-Fi Protocol 802.11 ad
The purpose of this thesis was to design an antenna for 60 GHz Wi-Fi protocol 802.11 ad. Due to high loss at this frequency, highly directional, narrow beam antennas are required. Therefore, for WLAN applications where hemispherical coverage is required, a multi-antenna-element solution is …
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Advanced MIMO-OFDM technique for future high speed braodband wireless communications. A study of OFDM design, using wavelet transform, fractional fourier transform, fast fourier transform, doppler effect, space-time coding for multiple input, multiple output wireless communications systems
… high speed mobile wireless communications on multicarrier systems. At first, alternative multicarrier kernels robust for high speed doubly-selective fading channel are sought. They include the comparisons of discrete Fourier transform (DFT), fractional Fourier transform (FrFT) and wavelet …
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Augmenting Wireless Security Using Zero-Forcing Beamforming
… is a cross-layer approach that exploits the multi-stream capabilities of existing technologies such as 802.11n and the upcoming 802.11ac standard where multi-antenna APs construct simultaneous data streams using Zero-Forcing Beamforming (ZFBF). Instead of using this technique for simultaneous …
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A Calibration Method for a Controlled Reception Pattern Antenna and Software Defined Radio Configuration
… method for a controlled reception pattern antenna (CRPA) using a Software Defined Radio (SDR) configuration. The combination CRPA and SDR system consists of a low-cost 7-element configuration where the antenna RF inputs are feed directly into the multi-channel SDR system. This combination …
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Beamforming for MC-CDMA
Orthogonal Frequency Division Multiplexing (OFDM) has recently gained a lot of attention and is a potential candidate for Fourth Generation (4G) wireless systems because it promises data rates up to 10Mbps. A variation of OFDM is Multi-Carrier CDMA (MC-CDMA) which is an OFDM technique where the …
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