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 135 for “"Transmit Power"”.
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Characterization of Uplink Transmit Power and Talk Time in WCDMA Networks
… ever increasing. Of the many components, the RF power amplifiers receive the most attention as they draw significant battery current and continue to represent the largest power load on the battery. In order to improve the overall efficiency of a power amplifier, it is important to know the …
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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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Performance evaluation of transmit diversity techniques in the CDMA 2000 standard
… evaluates the performance of two forward-link transmit diversity techniques in the CDMA2000 standard: Space-Time Spreading (STS) and Phase-Sweep Transmit Diversity (PSTD). For each technique, the evaluation consists of conducting 9.6 kbps Markov calls in the field and measuring the mean …
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Evaluation of Dynamic Channel and Power Assignment Techniques for Cognitive Dynamic Spectrum Access Networks
… with respect to the Dynamic Channel and Power Assignment (DCPA) problem. DCPA refers to the allocation of transmit power and frequency channels to links in a cognitive dynamic spectrum network so as to maximize the total number of feasible links while minimizing the aggregate transmit …
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Optomal three-time slot distributed beamforming for two-way relaying
… the first and second phases, the transceivers, transmit their signals, toward the relays, one after other. The signals that are received by relays are noisy versions of the original signals. Each relay, multiplies its received signal by a complex beamforming coefficient to adjust the phase and …
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A Low Power Beacon for Transmitting Location Data via the Globalstar Satellite System
… beacon does not need to be independently powered or to have global coverage. This thesis attempts to find a design solution for a beacon that transmits location data, is battery powered, and has world-wide coverage. The beacon is intended to be a low power, transmit only device, and the …
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Autonomous Link-Adaptive Schemes for Heterogeneous Networks with Congestion Feedback
… mobiles need to balance spectral efficiency, power consumption and fairness constraints. In this dissertation we focus on how decentralized and autonomous mobiles in multihop cellular systems can optimize their own local objectives by taking into account end-to-end or network-wide conditions. …
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Betrachtungen zur Energieeffizienz in Funknetzwerken mit geringer Datenrate
… access. The main conclusion is, that higher transmit power can yield decreased energy consumption if the time, which nodes spend in the energy intense active mode, is reduced. Ultra-Wideband-transmission (UWB) using short pulses (Impulse Radio-IR) is currently developing. The potential of …
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Network lifetime extension, power conservation and interference suppression for next generation mobile wireless networks
… against undesired interference of unknown power, while preserving simple design, with closed-form solution for error probabilities. It is shown that these detectors are linearly optimal, if the interference power is unknown. In the area of network lifetime extension, a new approach to …
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Mechanisms for Enhancing Spectrum Utilization in a Spectrum Access System
… systems with resource allocation based on transmit and receive precoding matrices have proven to enhance the spectral efficiency of cellular systems. In this thesis, we extend these concepts to a spectrum sharing system with primary users and secondary users. The spectrum sharing area is …
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Cooperative diversity in wireless networks : algorithms and architectures
… virtual antenna array, trading off the costs-in power, bandwidth, and complexity-for the greater benefits gained by exploiting spatial diversity in the channel. By contrast, classical network architectures only employ point-to-point transmission and thus forego these benefits. After summarizing a …
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Design of a Phi-2 and a Class E inverter for underwater systems
… submarines. This can be done with wireless power transfer (WPT), which can transmit power efficiently across mediums within the submarine, therefore eliminating the need for physical connections and making underwater systems more compact and light-weight. The thesis presents two WPT systems …
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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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Null power reallocation for data rate improvement in a wireless multicarrier system
… choose a constant data modulation scheme and transmit power level for all sub carriers in the available signal bandwidth. Although these implementations maintain acceptable performance when channel conditions are poor, they do not efficiently utilize the full capacity of a transmission …
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Sum-rate optimal network beamforming and power allocation for single-carrier asynchronous bidirectional relay network
… problem 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) …
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Statistical delay QoS driven resource allocation and performance analysis for wireless communication networks
… violation probability requirement and an average transmit power constraint. Formulated as a normalized multiobjective optimization problem (MOP), the problem is transformed into a weighted single-objective optimization problem (SOP), and then solved. The proposed optimal power value is proved to …
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RF-EMF Radiation Exposure and Radio Resources Management in 5G Wireless Network
… efficient management of resources such as; the transmit power, time, physical resource blocks (PRBs), frequency (sub-channels) is required. Deciding on how to efficiently allocate, manage, and control the resources dynamically among several slices and users in an isolated multi-tenancy scenario …
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Jointly optimal pre- and post-channel equalization and distributed beamforming in asynchronous bi-directional relay networks
… at both transceivers is minimized under a total transmit power budget by optimally obtaining the transceivers’ powers and relay beamforming weight vectors as well as pre- and post-channel equalizers at the two transceivers. We prove that our proposed approach results in a certain relay selection …
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Sum-rate maximization for two-way active channel with unequal subchannel noise powers
… orthogonal subchannels. In such channels, the transmitted signals undergo path loss, phase shift, and can also be affected by multi-path propagation effects. In conventional wireless channel models, there is no control over the gain of each individual subchannel. We herein refer to these …
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Study of Techniques For Reliable Data Transmission In Wireless Sensor Networks
… consumes the major portion of the available power. Thus, due to stringent limitations on the nodes' hardware and power resources in WSN, data transmission must be power-efficient in order to reduce the nodes' power consumption, and hence to maximize the network lifetime while satisfying the …
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