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 19 of 19 for “"receive antenna"”.
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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 …
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Theory, design and implementation of an IF cancellation module for use in a stepped frequency continuous wave ground penetrating radar
… the leakage signal between the transmit and receive antenna in a Stepped Frequency Continuous Wave Ground Penetrating Radar. The front end of the radar operates at high signal levels and, as a result, a large signal is coupled directly from the transmit to the receive antenna. This signal …
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Combined Space-Time Diversity and Interference Cancellation for MIMO Wireless Systems
… cancellation techniques when employing multiple-receive antenna in interference-limited systems. The first part of this dissertation presents two major contributions to MIMO systems. The analytical expression for space-time MIMO channel correlation is derived for a Rayleigh fading channel. The …
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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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Electrical Design and Testing of an Uplink Antenna for Nanosatellite Applications
… crosslink. A linearly polarized resonant loop antenna mounted above the bottom surface of the spacecraft was selected for a possible satellite uplink receive antenna. The resonant loop was chosen to satisfy the physical requirements of the spacecraft whild still achieving efficient operation …
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Information theory of transmit diversity and space-time code design
… information rates for multiple transmit multiple receive antenna systems in fast fading channels. Then we consider non-ergodic channel, where we evaluate asymptotic expression for the outage probability and note its striking similarity with the error probability. After that, we consider a simple …
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Channel Probing for an Indoor Wireless Communications Channel
… simulate the performance of spatial diversity in receive antenna configurations. The model presented by Saleh and Valenzuela, was added to by Spencer et. al., and included all three of these parameters for a 7 GHz channel. A system was built to measure these multipath parameters at 2.4 GHz for …
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Efficient scheduling of multi-antenna broadcast systems
… 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 the …
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Efficient signal, code, and receiver designs for MIMO communication systems
… regimes. We focus on a two-transmit and two-receive antenna system, in which the receiver has channel knowledge, but the transmitter does not. We first investigate uncoded transmission. We propose a class of lattice-reduction-aided low-complexity detectors that can achieve near maximum …
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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 …
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Empirical Approch For Rate Selection In MIMO OFDM
… 802.16. Recently, use of multiple transmit and receive antenna for improving spectral efficiency in a wireless system has received much interest. IEEE 802.11 has set up the Work Group 802.11n to develop a standard for enhanced rate 802.11 based on OFDM using Multi Input/Multiple Output (MIMO) …
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Optimizing communication performance of low-resolution ADC systems with hybrid beamforming
… have drawn extensive attention as a promising receiver architecture for millimeter wave (mmWave) communications by reducing hardware cost and power consumption. In this dissertation, hybrid beamforming systems that employ low-resolution ADCs are considered to achieve a better trade-off between …
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Unitary Space-Time Waveform Scheduling for High-Resolution Delay-Doppler MIMO Radar Sensing
… are simultaneously transmitted from different antennas. The goal is to process the returns in a way that the overall ambiguity function is a sum of individual ambiguity functions, such that the sum better approximates the ideal thumbtack shape. The transmitted waveforms are based on …
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Multicodes for improved range resolution in radar
… peak factor that would result if only a single antenna 15 used. This requires the Radar system to have multiple transmitters as in phased array radar. The best example is a multi-function digital array radar that transmits a unique orthogonal code from each of its antenna elements as described …
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A discrete RET Model for Micro- and Millimetre Wave Propagation through Vegetation
… structure, leading to the determination of the received signal inside or around a given illuminated vegetation medium. <br/><br/>The performance of the proposed model, was assessed utilising results from an extended range of measurements, carried out in different environments. Such measurements …
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Mechanisms for Enhancing Spectrum Utilization in a Spectrum Access System
Multi-antenna systems with resource allocation based on transmit and receive precoding matrices have proven to enhance the spectral efficiency of cellular systems. In this thesis, we extend these concepts to a spectrum sharing system with primary users and secondary users. The spectrum sharing area …
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Low-Complexity Algorithms for Channel Estimation in Optimised Pilot-Assisted Wireless OFDM Systems
… is subject to random variation with time, the receiver typically employs a channel estimator for CSI acquisition. The channel response information retrieved by the estimator is then used by the data detector and can also be fed back to the transmitter by means of in-band or out-of-band …
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Near-capacity co-located and distributed MIMO systems
… types of fundamental gains, when using multiple antennas in wireless communications systems: the multiplexing gain and the diversity gain. Spatial multiplexing techniques such as the Vertical Bell-labs LAyered Space-Time (V-BLAST) scheme exploit the associated multiplexing gain in terms of an …