Global ETD Search
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Showing 1 to 8 of 8 for “"Waterfilling"”.
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A Ray-Based Investigation of the Statistical Characteristics and Efficient Representation of Multi-Antenna Communication Channels
… pairing can yield better than 90% of the ideal waterfilling capacity when adequate training-based channel estimates are available. Additionally, we investigate a covariance feedback method for providing channel feedback for increased capacity. Both the ray-based and covariance-based feedback …
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Null power reallocation for data rate improvement in a wireless multicarrier system
… sub carriers. Furthermore, a higher complexity waterfilling redistribution scheme is simulated and compared against the simple redistribution scheme. The simulations of the waterfilling scheme predict a higher data rate increase of 13.2% over no redistribution if given the same power …
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New Approach to Dynamic Spectrum Management for DSL Environments = Contribución a la gestión dinámica del espectro en es escenarios DSL
… sub-carriers in multi-carrier system by waterfilling policy is not optimal because the distribution of the input symbols is assumed to follow the Gaussian distribution. This is not the case for practical systems where inputs are obtained by different modulation techniques. Particularly, …
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Channel Estimation in TDD and FDD-Based Massive MIMO Systems
… for each training time slots is obtained via a waterfilling-type expression. In the final part, we study the downlink channel estimation for frequency-division-duplex (FDD) massive MIMO systems. Acquiring downlink channel state information in these systems is challenging due to the large …
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Multi-layer Optimization Aspects of Deep Learning and MIMO-based Communication Systems
… elements. We derive a generalized iterative waterfilling algorithm for power allocation that maximizes the ergodic achievable rate. We verified the sum rate improvement with our proposed scheme through extensive simulation tests. Next, we introduce a novel physical layer scheme for single …
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Resource allocation for multi-cell OFDMA based cooperative relay network
… Finally, based on the amount of ICI, a modified waterfilling power distribution algorithm is proposed and used to optimise the subcarrier power allocation across the allocated set of subcarriers. This thesis also investigates the impact of the relay-to-destination channel gain on subcarrier …
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Unified approach for optimisation of single-user and multi-user multiple-input multiple-output wireless systems
… Schließlich leiten wir die generalisierte Waterfilling Lösung als optimale Sendestratgie für perfekte Kanalkenntnis am Sender und Empfänger her und charakterisiern die Eigenschaften dieses Verfahrens. In einem zellularen Mobilfunksystem greifen mehrere Teilnehmer zur gleichen Zeit auf …
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Efficient radio resource management in integrated terrestrial and non-terrestrial networks
… distribution sub-problem is reformulated into a waterfilling problem and solved utilising CVXPY, consequently analysing the effect of distributing the unallocated basic bandwidth units to the associated users. Second, since the greedy heuristic solution to the user association sub-problem does …