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 14 of 14 for “"Antenna selection"”.
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Transmit antenna selection in fading wireless communication systems
… 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 the system …
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Antenna Selection for a Public Safety Cognitive Radio
… the dawn of radio communication systems, the antenna has been the key component in the construction and performance of every wireless system. With the proliferation of new radio systems, a cognitive radio is a radio that has the capability to sense, learn, and autonomously adapt to its …
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Antenna Selection And MIMO Capacity Estimation For Vehicular Communication Systems
… results are utilized to examine multi-antenna systems for vehicular communication. </p> <p>The challenge in developing an efficient network between cars is to understand the nature of random channels that changes with the location of antenna, surroundings and obstacles between the …
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Robust multi-group multicast beamforming design and antenna selection for massive MIMO systems
… (MIMO) systems for two scenarios; 1) all antennas are available at the base station (BS), 2) only subset of antennas are available due limitation on the number of RF chains (joint antenna selection and beamforming design). In both scenarios we assume only estimates of the channel …
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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 …
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A POMDP framework for antenna selection and user scheduling in multi-user massive MIMO systems
… 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 POMDP framework for antenna …
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On iterative low-complexity algorithm for optimal antenna selection and joint transmit power allocation under impact pilot contamination in downlink 5g massive MIMO systems
… Meanwhile, an increase in the number of antenna arrays at BSs resulted in greater power consumption due to the increased number of radio-frequency (RF) chains, which could not be neglected and became a technical challenge. Achievable high data rate in massive MIMO, depended on quality of …
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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 …
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Interference Mitigation by Reconfigurable Adaptive Antenna Array
Antenna arrays play an important role in diverse application areas, such as target detection and direction of arrival (DOA) estimation to list a few. Traditional receiver structures with a fixed array configuration are either inefficient due to array redundancies or may incur significant …
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Doctoral Thesis: Massive MIMO in Real Propagation Environments
… with a large number, say tens to hundreds, of antennas, many terminals can be served in the same time-frequency resource without severe inter-user interference. Through "aggressive" spatial multiplexing, higher data rates can be achieved without increasing the required spectrum. Processing …
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Applications of machine to machine communication in remote healthcare systems
… throughput, and delay. Subsequently, an Antenna Selection Sensing (ASS) scheme is used to improve sensing accuracy. The simulation results show that the energy efficiency of the CM2M gateways can be improved by at least 35%. In addition, the thesis considered an Energy-Efficient Channel …
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Analytical Framework for the Performance Analysis of Multiple Antenna Systems
There has been great interest in antenna array processing (diversity, beamforming, null steering, and spatial multiplexing) to enhance the received signal quality and the capacity of wireless communications systems. However, in order to properly exploit the characteristics of different array …
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Analysis of Wireless Networks With Massive Connectivity
… multiple-output (MIMO) networks with joint antenna selection and user scheduling. We propose a two-step iterative procedure to maximize the EE. In each iteration, bisection search and random selection are used first to determine a subset of antennas with the users selected before, and then …
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The Impact of Antenna and RF System Characteristics on MIMO System Capacity
… spectral efficiency through the use of multiple antennas at the transmitting and receiving nodes. Such multiple-input multiple-output (MIMO) systems show promise for dramatic performance gains over their single-antenna counterparts. However, MIMO system performance is influenced by many different …