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 89 for “"Power Allocation"”.
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Power allocation for cooperative wireless networks
… optimization through partner selection and power allocation gives a practical performance gain of 2-4dB over equal power allocation, even in the case where only averaged channel state information is used. Furthermore, we found that a theoretical gain of 6-8dB can be achieved over equal power …
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Power allocation in energy harvesting two-way relay systems
… the optimization problem of harvesting energy allocation which maximizes the total data throughput of a wireless network under some restrictions at the EH node(s). In the first scenario, only the relay node is powered up by the harvested energy and the other two transceiver nodes are powered up …
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Node Selection, Synchronization and Power Allocation in Cooperative Wireless Networks
… resources for communications: bandwidth and power. In turn, cooperative communications has emerged as a new communication paradigm in which network nodes share their antennas and transmission resources for distributed data exchange and processing. Recent studies have shown that cooperative …
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Power allocation of multi-rate transmissions over a jammed broadcast channel
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Joint channel pairing and power allocation optimization in two-way multichannel relaying.
… the problem of joint subchannel pairing and power allocation to maximize the achievable sum-rate in the network, under an individual power budget at each node. To solve this challenging joint optimization problem, an iterative approach is proposed to decompose the problem into pairing …
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Power allocation and linear precoding for wireless communications with finite-alphabet inputs
… system/networks through linear precoding and power allocation. First, the mutual information or capacity region is derived for finite-alphabet inputs such as phase-shift keying (PSK), pulse-amplitude modulation (PAM), and quadrature amplitude modulation (QAM) signals. This approach, without …
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Optimal Routing and Power Allocation for Wireless Networks with Imperfect Full-Duplex Nodes
… cancellation and solve the routing and power allocation problem in this network. We use a model that focuses on the effects of full-duplex by including residual self-interference and one hop interference while other interfering signals are considered negligible in comparison. We first …
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Dynamic power allocation and routing for satellite and wireless networks with time varying channels
… channels that depend on attenuation conditions, power allocation decisions, and inter-channel interference. In order to reliably integrate these systems into a high speed data network and meet the increasing demand for high throughput and low delay, it is necessary to develop efficient network …
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Sum-rate optimal network beamforming and power allocation for single-carrier asynchronous bidirectional relay network
… of sum-rate maximization, under a total transmit power budget, for an asynchronous single-carrier bidirectional (two-way) network. The network consists of two single-antenna transceivers which wish to exchange information with the help of multiple single-antenna amplify-and-forward (AF) relays. We …
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A Comparison of artificial intelligence algorithms for dynamic power allocation in flexible high throughput satellites
… puts the spotlight on new resource allocation strategies that use autonomous algorithms at the core of their decision-making systems. These algorithms must be able to find optimal resource allocations in real or near-real time. Traditional optimization approaches no longer meet all …
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Sum-rate maximization in multi-RIS multi-carrier systems through active power allocation and passive beamforming
… In this work, we jointly optimize the transmit power at the base station (BS) and the passive beamforming of RIS reflecting elements to maximize the achievable rate at the user’s location. Three RIS reflection model assumptions are considered and analyzed. In Scenario A, we establish upper and …
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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
… 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 channel and analyze the circuit power …
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Distributed Turbo Product Coding Techniques Over Cooperative Communication Systems
… the overall decoding errors, we propose a power allocation method for the distributed encoded system when the channel attenuations for the direct and relay channels are known. We compare the performance of our proposed power allocation method with the fixed power assignments for DTPC …
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Energy-efficient relay cooperation for lifetime maximization
We study energy-efficient power allocation among relays for lifetime maximization in a dual-hop relay network operated by amplify-and-forward relays with battery limitations. Power allocation algorithms are proposed for three different scenarios. First, we study the relay cooperation case where all …
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Spectrum sharing systems for improving spectral efficiency in cognitive cellular network
… spectrum is the invisible infrastructure that powers the wireless communication, the demand has been exceptionally increasing in recent years after the implementation of 4G and immense data requirements of 5G due to the applications, such as Internet-of-Things (IoT). Therefore, the effective …
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Optimising energy efficiency and spectral efficiency in multi-tier heterogeneous networks : performance and tradeoffs
… demand of higher transmission rate and lower power consumption is a dilemma for the design of future generation networks. The spectral efficiency (SE) can be improved by better utilisation of the network resources at the cost of reduction in the energy efficiency (EE) due to the enormous …
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Sum-rate maximization for two-way active channel with unequal subchannel noise powers
… In this thesis, we study the problem of joint power allocation and design of a parallel channel with orthogonal subchannels where not only the source transmit power(s) over subchannels can be adjusted, but also the powers of each subchannel can be carefully chosen for optimal performance. We …
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Channel modeling and resource allocation in OFDM systems
… wideband and ultra wideband channels. Resource allocation based on channel state information (CSI) is known to be a very powerful method for improving the spectral efficiency of OFDM systems. Bit and power allocation algorithms have been discussed for both static channels, where perfect …
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Polarization Reconfigurable Non-Orthogonal Multiple Access (PR-NOMA) for Next Generation Communication Systems
… antenna side, a combination of the polarization, power transmission and the transmission power allocation coefficient, α, is to be configured and adjusted to work with the combination of the received signals and the polarization at the receiver side, Rx. This novel paradigm is the motivation …
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Capacity of Gaussian noise channels with side information and feedback
… call for an efficient use of the available power and bandwidth resources. In order to achieve a maximum system efficiency, the transmission conditions have to be constantly monitored and used to update the transmission strategies. The transmitters usually have some form of information …
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