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 36 for “"power constraint"”.
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Communications in the observation limited regime
… than amplitude, lowers circuit complexity and power dissipation significantly, but makes synchronization harder. We show that while the distance function of this non-linear coding problem is intractable in general, it is Euclidean at vanishing SNRs, and root Euclidean at large SNRs. We present …
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Safe Exploration for Dynamic Computer Systems Optimization
… systems need to execute under strict safety constraints (e.g., power limit), but doing so often conflicts with their ability to deliver high performance (i.e., minimal latency). To meet these conflicting goals, prior work uses machine learning to automatically tune hardware resources such …
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Communication for wideband fading channels : on theory and practice
… channel. When the input is subject to an average power constraint. it is shown that the capacity-achieving input amplitude distribution for a Rician channel is discrete with a finite number of mass points in the low SNR regime. A similar discrete structure for the optimal amplitude is proven to …
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Tradeoffs in Designing Massively Parallel Accelerator Architectures
… and RTL synthesis to characterize the area-power-delay of the underlying circuits. This integrated methodology enables a much more powerful analysis of the performance-area and performance-power tradeoffs for the low level micro-architecture. We use this methodology to find the optimal …
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On the MIMO Capacity with Multiple Power Constraints
… to this fundamental problem under multiple power constraints. From the theoretical perspective, capacity maximization is a classical problem. However efficient algorithms considering realistic scenarios or multiple power constraints, especially for massive MIMO application, are still sparse. …
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Error exponents for multipath fading channels : a strong coding theorem
… of the multipath fading channel under an average power constraint in the limit of infinite bandwidth. These bounds constitute a strong coding theorem for the channel as they not only delimit the range of achievable rates, but also give us a relationship among the error probability, data rate, …
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Design of optimal equalizers and precoders for MIMO channels
… observation noises with unknown PSD but bounded power-norm. A worst-case approach to optimal design of channel equalizers leads to an equivalent optimal H-infinity filtering problem for the MIMO communication systems. An explicit design algorithm is derived which not only achieves the …
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Energy efficient multiple antenna communication
… and receiver and there is only an average input power constraint. We compute the capacity and analyze its dependence on coherence length, number of antennas and receive signal-to-noise ratio (SNR) per degree of freedom. We establish conditions on the coherence length and number of antennas for …
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Reliability of a Gaussian channel in the presence of Gaussian feedback
… Gaussian Noise channel was studied under a peak power constraint, in the presence of a feedback channel that was also a continuous time peak-power constrained infinite bandwidth Additive White Gaussian Noise channel. Motivated by [9], a two phase scheme was studied, where, in the first phase, the …
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Codebook design for distributed relay beamforming system
… focuses on the phaseonly codebook and with-power-control codebook design methods under individual relay power constraints. Phase-only codebooks can be generated off-line with the Grassmannian beamforming criterion. Due to non-uniform distribution of the optimal beamforming vector in the …
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Intelligent antenna sharing in cooperative diversity wireless networks
… low SNR regime and under a total transmission power constraint.
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Multi-rate access schemes and successive interference cancellation for wireless multimedia MC-CDMA communications
… well known that SIC is sensitive to the receive power distribution. By providing channel state information (CSI) at the receiver and reliable feedback of power distribution from the receiver to the transmitter, SIC can be integrated with power distribution control (PDC), which improves the system …
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Mechanisms for Enhancing Spectrum Utilization in a Spectrum Access System
… transmit and receive antennas, with the transmit power constraint defined as a function of the interference threshold of the primary user. The area covered by a database enabled spectrum access system is represented as spatial bins, which are regions of predefined sizes. Each bin is assumed to …
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Statistical delay QoS driven resource allocation and performance analysis for wireless communication networks
… rate with a guaranteed delay-outage probability constraint, is analyzed and investigated in terms of delayconstrained resource allocation and link-layer throughput analysis. Firstly, a joint optimization problem of link-layer energy efficiency (EE) and EC in a single-user single-carrier …
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Optimisation and algorithms in wireless networks for mission critical applications
… spectral efficiency of proposed interference power constraint resource allocation scheme as opposed to achieved average spectral efficiency by non-cooperative Time Division Multiple Access (TDMA) method is provided to prove that the proposed cooperative Base Stations (BSs) scheme outperforms …
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Performance analysis of FBMC over OFDM in Cognitive Radio Network
… much attention was focused on interference and power constraint. The proposed algorithms have been verified using MATLAB simulations, however, numerical results show that FBMC can attain higher spectrum efficiency and attractive benefit in terms of spectrum sensing as opposed to OFDM. The …
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Finite Element Analysis Based Modeling of Magneto Rheological Dampers
… before the other models. For cases with power constraint or heat build up limitations, this model could work the best among the four designs that we considered. For cases where higher electrical currents can be tolerated, model 3 would be the most advantageous design, since it provides …
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MSE-based Linear Transceiver Designs for Multiuser MIMO Wireless Communications
… of the sum-MSE over all users subject to a sum power constraint on each transmission. Using MSE duality, we solve a computationally simpler convex problem in a virtual uplink. The transformation back to the downlink is simplified by our demonstrating the equality of the optimal power allocations …
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Comparing Duplexing, Multiplexing, and Multiple Access Techniques in Ad Hoc Networks
… data rate per transmission, required transmit power per link, throughput, relative range and capacity. To keep the analyses tractable, topologies we study are full mesh networks, relay networks, and several special cases of ad-hoc networks. The main results show that for a peak power …
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The Impact of Antenna and RF System Characteristics on MIMO System Capacity
… formulating system capacity using a radiated power constraint, the capacity is shown to be overestimated due to superdirectivity. Since superdirectivity provides for elegant theoretical results and poor realistic performance, this work incorporates constraints into the formulation of system …
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