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.
Results
Showing 1 to 20 of 24 for “"transmit antenna"”.
-
Transmit antenna selection in fading wireless communication systems
… (MIMO) systems, we propose the use of the transmit antenna selection technique. In transmit antenna selection, the best performing antenna(s) is selected from all the available transmit antennas for transmission. Transmit antenna selection reduces the number of radio frequency chains, and …
-
Design of an HF transmit antenna for bistatic ionospheric soundings in Antarctica
… to install a low-powered high frequency (HF) transmitter at the South Pole for use in a bistatic ionospheric sounding system intended to detect such TIDs. The aim of this dissertation was to design a suitable transmitter antenna such that propagating skywave signals could successfully be …
-
Performance evaluation of cross-layer energy-efficient transmit antenna selection for spatial multiplexing systems
… systems. This thesis studies energy-efficient antenna selection for spatial multiplexing multiple-antenna systems from a cross-layer perspective, contrary to the norm, where physical-layer energy efficiency metrics are optimized. The enhanced system performance achieved by cross-layer designs …
-
Genetic algorithm design and testing of a random element 3-D 2.4 GHZ phased array transmit antenna constructed of commercial RF microchips
… to predict adequately the behavior of an array antenna with randomly located elements was verified with expected results through the design, construction, development and evaluation of a test-bed array. The test-bed array was constructed of commercially available components, including a unique …
-
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 …
-
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
… that, during high mobile speed, it is better to transmit OFDM signals using lower operating frequencies. The information theory for the 2-transmit antenna OSTBC does not support higher order implementation of multi-antenna systems, which is required for the future generation wireless …
-
Wideband active antenna cancellation
There exists a simultaneous transmit and receive antenna system where the transmitted signal is creating wideband interference of the receiver. To resolve this interference problem, the isolation between the transmit antenna and the receive antenna must be increased. This thesis analyzes and …
-
Iterative Leakage-Based Precoding for Multiuser-MIMO Systems
… including imperfect channel state information, transmit antenna correlation, and time-varying channels. Solutions are derived which improve performance of the algorithm with imperfect channel state information at the transmitter by leveraging knowledge of the second-order statistics of the …
-
VT-STAR design and implementation of a test bed for differential space-time block coding and MIMO channel measurements
… (SIMO) channel in the reverse link, meaning one transmit antenna at the user terminal and multiple receive antennas at the base station. Recently, information theoretic research has shown an enormous potential growth in the capacity of wireless systems by using multiple antenna arrays at both …
-
Software-Defined Radio Implementation of Two Physical Layer Security Techniques
… Multiple-Input Single-Output system where the transmitter uses Channel State Information from the intended receiver to inject Artificial Noise (AN) into the receiver's nullspace. The AN is consequently not seen by the intended receiver, however, it will interfere with eavesdroppers experiencing …
-
Channel Estimation Strategies for Coded MIMO Systems
… wireless channel, deploying multiple antennas at both the transmitter and receiver achieves high data rate, without increasing the total transmission power or bandwidth. When perfect knowledge of the wireless channel conditions is available at the receiver, the capacity has been shown …
-
Self-Interference Cancellation for Simultaneous Transmit and Receive (STAR) Applications
Co-channel interference between transmit and receive antennas means that simultaneous transmission and reception (STAR) of signals on the same frequency is an engineering challenge when co-locating the transmit and receive channels. Due to advancements in Radio Frequency (RF) receiver and antenna …
-
Laboratory and field trials evaluation of transmit delay Diversity applied to DVB-T/H networks
… with minimized environmental impact. The use of transmit diversity techniques with multiple antennas have long been proposed to improve the performance and capacity of wireless systems. Transmit diversity exploits the scattering effect inherent in the channel by means of transmitting multiple …
-
Power Consumption Optimization: A Cognitive Radio Approach
… between radiated power (power radiated from the transmit antenna) and the consumed power (power drawn from the power source, such as a battery). It provides a way to connect communication (which usually cares about radiated power, received signal to noise ratio, etc.) to hardware (which focuses …
-
Optimizing communication performance of low-resolution ADC systems with hybrid beamforming
… considering switch-based analog beamforming, antenna selection at a base station is investigated for low-resolution ADC systems. Unlike downlink transmit antenna selection problems, a quantization-aware antenna selection criterion is necessary and derived to incorporate quantization error for …
-
Differentially fed active antennas
… the benefits of differentially fed balanced transmit antenna in modern communication system. Extensive experimental studies have established the fact that a true differential amplifier feeding a balanced antenna offers higher linearity and lower distortions compared to the single ended …
-
Pre-equalization for pre-Rake MISO DS-UWB systems
… from the receiver to the more powerful transmitter, which is the main focus of the present work. In this thesis, we propose two novel pre-equalization schemes for multiple- input single-output (MISO) direct-sequence ultra-wideband (DS-UWB) systems with pre-Rake combining and …
-
Capacity-approaching data transmission in MIMO broadcast channels
This dissertation focuses on downlink multi-antenna transmission with packet scheduling in a wireless packet data network. The topic is viewed as a critical system design problem for future high-speed packet networks requiring extremely high spectral efficiency. Our aim is to illustrate the …
-
Sphere detection and LDPC decoding algorithms and architectures for wireless systems
… of communication systems with multiple transmit and receive antennas. In addition, excellent error-rate performance can be achieved with iterative receiver structure composed of inner detection and outer decoding. In this work we design algorithms and architectures for iterative wireless …
-
Protocols for multi-antenna ad-hoc wireless networking in interference environments
… '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 multiple …
Page 1 of 2