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 33 for “"signal-to-interference-plus-noise ratio"”.
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The loudest one wins : efficient communication in theoretical wireless networks
In order to develop the most efficient algorithms for wireless networks, first one must understand their theoretical limitations. To this end, we study the leader election and broadcast problems in wireless networks, modeling them using the Signal-to- Interference-plus-Noise-Ratio (SINR) model. Our …
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Coordinated Beamforming for Millimeter-wave Terrestrial Peer-to-Peer Communication Networks
Terrestrial mobile peer-to-peer millimeter wave networks will likely use beamforming arrays with narrow beams. Aligning narrow beams is difficult. One consideration for aligning narrow beams is co-channel interference. Beams can be aligned either on a per-link basis where co-channel interference is …
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Optimal structure and efficient algorithm for max-min fair multi-group multicast beamforming
… (MMF) multi-group multicast beamforming design to maximize the minimum signal-to-interference-plus-noise ratio (SINR) subject to transmit power limit. We obtain the optimal multicast beamforming solution structure for an arbitrary system configuration. We show that the optimal MMF solution has a …
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Advanced Linear Identification Techniques For Signal Processing And Digital Video Broadcasting
Linear identification technique is to linearly embed a piece of unique information into digital media data for the purpose of satisfying specific demands such as identification, annotation, and copyright, etc. We need to consider the quantity and the quality of identification data to be embedded as …
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COOPERATIVE COMMUNICATIONS FOR LTE-ADVANCED SYSTEMS: DOWNLINK RELAY AND PERFORMANCE OPTIMIZATION
The Third Generation Partnership Project's Long Term Evolution-Advanced (LTE-A) is considering an option for relay networks to provide cost-effective throughput enhancement and coverage extension. While analog repeaters have been used to enhance coverage in commercial cellular networks, the use of …
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Investigation of mutual coupling effects on pattern null reconfigurable antennas in small adaptive arrays
… control over the magnitude and phase applied to each array element to modify the array pattern. Recently, pattern reconfigurable elements have been introduced into adaptive arrays, establishing a new form of array pattern control. Using a reconfigurable element model, null reconfigurability …
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A novel beam management strategy using UE trajectory mapping
… method leverages user equipment (UE) trajectory information by segmenting user trajectories into equal-length segments, focusing the beam on the centre of each segment to ensure stable and consistent signal coverage. The methodology integrates angular weighting, and dynamic power control to …
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Spreading sequence design for relay networks under multipath fading
… evolution (LTE)-Advanced. An effective method to combat multipath fading is a code division multiple access (CDMA) scheme. The objective of this dissertation is to present an effective method in designing nonbinary, secure, and optimum spreading and despreading pseudo noise (PN) sequences for …
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Contributions to Robust Adaptive Signal Processing with Application to Space-Time Adaptive Radar
Classical adaptive signal processors typically utilize assumptions in their derivation. The presence of adequate Gaussian and independent and identically distributed (i.i.d.) input data are central among such assumptions. However, classical processors have a tendency to suffer a degradation in …
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Four Branch Diversity Combining and Adaptive Beamforming Measurements Using Mobile Arrays at 2.05 GHz
… of four element arrays with different configurations and with different element patterns is compared using the square array of four half-wave dipole elements as the baseline. Results from diversity and beamforming measurements, performed in urban and suburban environments for both …
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Analysis of antenna beamforming architectures for wireless communications
… Multiple-Output (MIMO) systems in Fifth-generation (5G) and future Sixth-generation (6G) networks. The demand for high data rates and massive connectivity, positions spatial processing as a key enabling technology, especially in Millimeter Wave (mmWave) bands where propagation losses require …
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Structure-based learning via graph neural networks for multi-group multicast beamforming
… perfect channel state information (CSI) and need to be performed each time channel state information is updated. Due to the complexity involved in solving the problem, they lead to high computational run-time for largescale antenna-array systems. To overcome this challenge, we propose a robust …
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Phase noise effects on OFDM : analysis and mitigation
… One drawback of OFDM is its sensitivity to phase noise. It has been shown that even small phase noise leads to significant performance loss of OFDM. Therefore, phase noise effects on OFDM systems need to be analyzed and methods be provided to its mitigation. Motivated by what have been …
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Improving fractional frequency reuse (FFR) for interference mitigation in Multi-tier 4G wireless networks
The need to provide quality indoor coverage for mobile network users in an indoor environment has become paramount to communication service providers (CSPs). Femto-cells due to their low capital expenditure (CAPEX) and operating expenditure (OPEX) have seen widespread adoption as a possible …
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Simulation of Adaptive Array Algorithms for OFDM and Adaptive Vector OFDM Systems
… division multiplexing (OFDM) is well-known to be effective against multipath distortion. It is a multicarrier communication scheme, in which the bandwidth of the channel is divided into subcarriers and data symbols are modulated and transmitted on each subcarrier simultaneously. By inserting …
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Performance Analysis for 5G cellular networks: Millimeter Wave and UAV Assisted Communications
… in microwave ($\mu$Wave) bands does not seem to be capable of meeting this demand in the near future, motivating the move to new frequency bands. Therefore, operating with large available bandwidth at millimeter wave (mmWave) frequency bands, between 30 and 300 GHz, has become an appealing …
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Performance evaluation for communication systems with receive diversity and interference
… a well-known coherent detection technique used to combat fading and suppress cochannel interference. In this dissertation, expressions are developed to evaluate the error probability of OC for systems with multiple interferers and multiple receiving branches. Three approaches are taken to derive …
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Bandwidth and Energy-Efficient Route Discovery for Noisy Mobile Ad-Hoc Networks
Broadcasting is used in on-demand routing protocols to discover routes in Mobile Ad-hoc Networks (MANETs). On-demand routing protocols, such as Ad-hoc On-demand Distance Vector (AODV) commonly employ pure flooding based broadcasting to discover new routes. In pure flooding, a route request (RREQ) …
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Cooperative diversity aided direct-sequence code-division multiple-access systems
… relay may be significantly reduced in comparison to that of the source transmitter. In this thesis, we investigate the dependence of the achievable bit error ratio (BER) performance of DS-CDMA systems on the specific locations of the relays as well as on the power-sharing among the source …
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Interference management in cooperative multi-cell networks
… are aggressively reused, eliminating<br/>interference is the key factor to reduce the system energy consumption.<br/>This thesis proposes interference management techniques based on beamforming<br/>with different levels of cooperation amongst base stations (BSs).<br/>First, a multi-cell …
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