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.
Results
Showing 1 to 20 of 28 for “"Time-Varying Channels"”.
-
Feedback Communication Systems for Time-Varying Channels
… possibilities of data transmission over radio channels have been widely investigated. A major problem encountered on such channels is that of fading. This thesis is concerned with the possibility of using feedback to combat the effects of fading on digital communication systems. A number of …
-
Differential MMSE: A New Approach for Adaptive Interference Suppression Over Time-Varying Channels
… method for noncoherent communication over such channels is differential modulation and demodulation, which obviates the need to track amplitude and phase by exploiting the fact that channel variations over successive symbols are negligible. However, there are no known methods for adaptive …
-
Dynamic power allocation and routing for satellite and wireless networks with time varying channels
Satellite and wireless networks operate over time varying 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 …
-
Time varying channel models for 5G mobile communication systems
… information transfer to highly mobile users over time varying communication channels remains a shared obstacle. In this thesis, we contribute to these global efforts by providing further fundamental understanding of time varying channels in 5G mobile communication systems and overcome the …
-
Differential modulation and non-coherent detection in wireless relay networks
… nature of cooperative networks, acquiring fading channels information for coherent detection is more challenging than in the traditional point-to-point communications. To bypass the requirement of channel information, differential modulation together with non-coherent detection can be deployed. …
-
High-Speed Serial Data Link Design and Simulation
… The first architecture uses a continuous-time receiver equalizer to equalize a channel with known frequency response. The second incorporates an adaptive decision feedback equalizer (DFE) for use in unknown or time-varying channels.
-
A parallel systems approach to universal receivers
… design of communication systems for unknown and time-varying channels is introduced. The true channel is from a known set of channels called the channel class, but the transmitter and receiver do not know which of these channels is actually in effect. One of the goals of this research is to …
-
Wavelet Modulation in Gaussian and Rayleigh Fading Channels
… performance of wavelet modulation in Gaussian channels. This paper extends the investigation to the performance of wavelet modulation in time varying channels. We show that bit error rate (BER) wavelet demodulation performance in the additive, white, Gaussian noise (AWGN) channel is comparable …
-
The development and application of random matrix theory in adaptive signal processing in the sample deficient regime
… over which the channel can be approximated as timeinvariant is limited (wireless communications), the number of available observations is limited by the measurement process (medical applications), or the number of unknown coefficients is large compared to the number of observations (modern …
-
Scheduling algorithms for throughput maximization in time-varying networks with reconfiguration delays
We consider the control of possibly time-varying wireless networks under reconfiguration delays. Reconfiguration delay is the time it takes to switch network resources from one subset of nodes to another and it is a widespread phenomenon observed in many practical systems. Optimal control of …
-
The development and application of random matrix theory in adaptive signal processing in the sample deficient regime
… over which the channel can be approximated as time-invariant is limited (wireless communications), the number of available observations is limited by the measurement process (medical applications), or the number of unknown coefficients is large compared to the number of observations (modern …
-
Iterative Leakage-Based Precoding for Multiuser-MIMO Systems
… information, transmit antenna correlation, and time-varying channels. Solutions are derived which improve performance of the algorithm with imperfect channel state information at the transmitter by leveraging knowledge of the second-order statistics of the error. From this work we draw a number …
-
Transmission scheduling with deadline and throughput constraints
… reliability. Especially, as demand for real-time transmissions increases, transmitting packets with hard delivery deadlines poses an important network control problem. In this thesis, we propose a framework for characterizing feasibility regions and finding an optimal scheduling policy in …
-
Spatiotemporal processing and time-reversal for underwater acoustic communications
… transmitter/receiver arrays. Underwater acoustic channels can be characterized as rapidly time-varying systems that suffer severe Inter Symbol Interferences (ISI) caused by multi-path propagation. Multi-channel combining and equalization, as well as time-reversal techniques, have been used over …
-
Beamforming for MC-CDMA
… as well as interference suppression. Often times in cellular and military environments the desired signal can be buried below interference. In such conditions, the processing gain associated with the spreading cannot provide the needed interference suppression. This research work …
-
Blind Comprehension of Waveforms through Statistical Observations
… for a blind receiver in the presence of time varying channels, which is built from the work done on cumulants in static channels currently in the literature. Results show the classification accuracy is on the order or better than current methods in use in static channels that do not vary …
-
Delay gains from network coding in wireless networks
… files to multiple receivers over stochastic time-varying channels with non-zero erasure probabilities. The base station charges a price per receiver per file with the aim of maximizing its profit. Customers who wish to transmit files to the receivers decide to enter the system based on the …
-
An investigation of Turbo Codes over Mobile Wireless Channels
… are investigated over AWGN and Rayleigh fading channels. The decoder systems are compared for complexity as well as for equal numbers of iterations. Results show that less complex decoder strategies produce good results for voice quality bit error rates. Investigations are also made into the …
-
Signal Processing for Joint Source -Channel Coding of Digital Images
… over wireless and wire-line networks, multimedia communication in heterogeneous environments, and situations with uncertainty and fluctuations in the data source or channel parameters as is typical in wireless mobile communication. On the other hand, the joint source-channel coding …
-
Iterative Detection and Decoding for Wireless Communications
… of problems: the detection of turbo codes over time-varying channels, and the distributed detection of coded multiple-access signals. Because turbo codes operate at low signal-to-noise ratios, the process of phase estimation and tracking becomes difficult to perform. Additionally, the turbo …
Page 1 of 2