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 111 for “"Channel Capacity"”.
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Investigations into the physical layer of underwater networks to enhance channel capacity and performance.
… can be developed to pragmatically increase their channel capacity and general performance according to common networking metrics, so that data can be effectively and efficiently transmitted from the ocean floor to the surface enabling passive harvesting of data. It investigates replacing …
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Data retrieval in MIMO systems and the effects of correlation on the channel capacity
… the ways through which data sent over some channel from a number of transmitters are recovered at the intended receivers; Maximum likelihood (ML) and Zero-forcing (ZF), are used for the data decoding; how effective these retrieval processes are and the imminent effects of correlation on the …
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Dynamic pixel selection in free-space photon-counting optical communication systems for the exploitation of excess channel capacity
… of the array in order to exploit any excess channel capacity in the link to allow on-the-fly adjustments of data rates. Preliminary results, specific to the MIT Lincoln Laboratory photon-counting, free-space optical communication system, which utilizes an 8 x 8 GM-APD receiver array, operates …
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Investigation, Design and Implementation of MIMO Antennas for Mobile Phones. Simulation and Measurement of MIMO Antennas for Mobile Handsets and Investigations of Channel Capacity of the Radiating Elements Using Spatial and Polarisation Diversity Strategies.
… frequency bands. The radiation performance and channel capacity of these antennas were computed and measured: the results are discussed in the context of the frequency bands of interest. A comprehensive study of MIMO antenna configurations such as 2 × 1, 3 × 1, 2 × 2 and 3 × 3, using …
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Mismatch capacity per unit cost
The mismatch channel capacity per unit cost represents the maximum number of bits per unit cost that can be transmitted reliably across a channel under receiver mismatch conditions. It's reciprocal is the minimal cost of transmitting a bit reliably under these conditions. We derive lower bounds for …
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Complexity and second moment of the mathematical theory of communication
… to zero, whether their code rates converge to channel capacity, and whether their growth in complexities stays under control. Over any discrete memoryless channel, I build codes such that: for one, their block error probabilities and code rates scale like random codes’; and for two, their …
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ΒΕΛΤΙΣΤΗ ΔΙΕΚΠΕΡΑΙΩΣΗ ΤΗΣ ΚΙΝΗΣΕΩΣ ΣΕ ΤΗΛΕΠΙΚΟΙΝΩΝΙΑΚΑ ΔΙΚΤΥΑ ΜΕΤΑΓΩΓΗΣ ΚΥΚΛΩΜΑΤΩΝ
… CONSISTS IN ALLOCATING THE EXISTING NETWORK'S CHANNEL CAPACITY ACCORDING TO THE VARYING TRAFFIC OF THE WHOLE NETWORK. THIS DISSERTATION PRESENTS MODELS FOR TWO DIFFERENT NETWORK ARCHITECTURES WHICH LEAD TO OPTIMAL USE OF THE CHANNEL CAPACITY UNDER REALISTIC CONSTRAINTS AND OPTIMIZATION …
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Orthogonal Generalized Frequency Division Multiplexing (OGFDM)
… multiplexing (OGFDM) for increasing the wireless channel capacity without the need for extra bandwidth (BW) size or power consumption. The new wireless waveform (OGFDM) tends to obtain a better BW efficiency which in turn can increase highly the wireless channel capacity in comparison with the …
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Characterization and Computation of Optimal Distributions for Channel Coding
… QAM schemes at all transmission rate below the channel capacity.
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Towards optimal capacity-achieving transceivers with photonic integrated circuits
… one can in principle attain Holevo-limited channel capacity in the low mean photon number regime. Since the PNP offers dynamic reprogrammability, one can also, in principle, correct for wavefront distortion in the channel. We present a setup, calibration protocols, and preliminary results …
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Topics in complex random matrices and information theory
… information-theoretic measure, the so-called channel capacity. The capacity of the communication channel expresses the maximum rate at which information can be reliably conveyed by the channel. In particular, the capacities of the multiple input, multiple output Rayleigh and Rician distributed …
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Combined Space-Time Diversity and Interference Cancellation for MIMO Wireless Systems
… of multiple-input and multiple-output (MIMO) channels to enhance the capacity of wireless systems. In this study, we develop and evaluate a channel model, evaluate the corresponding channel capacity, and design and analyze a simple orthogonal transmit waveform for MIMO channels in mobile radio …
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Antenna Selection And MIMO Capacity Estimation For Vehicular Communication Systems
… link for vehicular communication extensive channel modeling and measurements are required. In this thesis a novel cost-effective implementation of vehicular channel capacity measuring system using off-the-shelf devices is proposed. Then using the proposed system, various channel measurements …
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Multiple-user quantum optical communication
… understanding of the information carrying capacity of optical channels requires the signal and physical channel to be modeled quantum mechanically. This thesis considers the problems of distributing multi-party quantum entanglement to distant users in a quantum communication system and …
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Two-Dimensional Information Transmission
The multimode optical fiber (MMF) channel is studied both experimentally and theoretically. Based on experimental results, the MMF is identified as a slowly time-varying fading channel with two-dimensional spatial freedoms. The capacity of the MMF is determined to be proportional to the …
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Finding the optimal demodulator under implementation constraints
… a well-defined objective function, e.g., the channel capacity and the cut-off rate. We propose easy-to-implement solutions for Gaussian channels that approximate the optimal results for these maximization problems. Three topics are addressed. First, we consider the case where the channel …
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Coding for Frequency-Hopped Spread-Spectrum Channels With Partial-Band Interference
… of codes on frequency-hopped spread-spectrum channels with partial-band interference is investigated. The asymptotic performance of codes is measured by the channel capacity and the random coding exponent. The performance of specific codes is measured by the bit error probability. The channel …
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Wireless Cooperative Communication and Networking
… can achieve diversity gain and increase the channel capacity. This paper proposes a novel cooperative scheme called Cooperative Step-Wise Demodulation, which utilizes low level demodulation to demodulate high level modulated signal cooperatively. This paper focuses cooperative scheme in …
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Millimeter-wave circuit design of coplanar integrated circuits and superconducting passive components
… radio and cellular bands because of limited channel capacity. Communication systems will be forced to use higher frequency bands to accommodate the expected large number of users. Currently, communication links are being designed at millimeter-wave frequencies. To be commercially viable, …
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Adaptive MMSE multiuser receivers in MIMO OFDM wireless communication systems
… better quality of service, and higher network capacity, there is a migration from Single Input Single Output (SISO) antenna technology to a more promising Multiple Input Multiple Output (MIMO) antenna technology. On the other hand, Orthogonal Frequency Division Multiplexing (OFDM) technique has …
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