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 15 of 15 for “"channel codes"”.
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Timing channel codes for covert communication and network flow tracing
… unintended for data transmission. In a covert channel, only the sender and receiver are aware of the communication and capable of reading the transmitted message, and any other party would not be aware of the existence of this transmission. The timing channel has been studied as a medium for …
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Quantized Guessing Random Additive Noise Decoding - A Universal Quantized Soft-Decoder
… evaluate error correction potential of different channel codes, particularly Polar Adjusted Convolutional codes, CA-Polar codes, and CRCs.
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Synchronization in digital communication systems: performance bounds and practical algorithms
Communication channels often transfer signals from different transmitters. To avoid interference the available frequency spectrum is divided into non-overlapping frequency bands (bandpass channels) and each transmitter is assigned to a different bandpass channel. The transmission of a signal over a …
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Joint source channel coding for progressive image transmission
… those embedded bit streams are very sensitive to channel noise and protections from channel coding are necessary. Typical error correcting capability of channel codes varies according to different channel conditions. Thus, separate design leads to performance degradation relative to what could be …
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Design and Analysis of Multilevel Coded Modulation for Multi-Node Networks
… additive white Gaussian noise (AWGN) broadcast channel, a multi-level coding architecture is proposed whose performance can approach the entire capacity region, and whose attractive features include a convenient partition of the two users’ data so that one and only one of the modulation bit …
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Spatially Coupled Sparse Regression Codes for Single- and Multi-user Communications
Sparse regression codes (SPARCs) are a class of channel codes for efficient communication over the single-user additive white Gaussian noise (AWGN) channel at rates approaching the channel capacity. In a standard SPARC, codewords are sparse linear combinations of columns of an i.i.d. Gaussian …
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Multiple access networks over finite fields : optimality of separation, randomness and linearity
… multiple access noisy as well as noise-free channel in which the received, transmit and noise alphabets belong to a finite field. We show that source-channel separation holds when the additive noise is independent of inputs. However, for input-dependent noise, separation may not hold. For …
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Near-capacity fixed-rate and rateless channel code constructions
Fixed-rate and rateless channel code constructions are designed for satisfying conflicting design tradeoffs, leading to codes that benefit from practical implementations, whilst offering a good bit error ratio (BER) and block error ratio (BLER) performance. More explicitly, two novel low-density …
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Sparse graph codes for compression, sensing, and secrecy
Sparse graph codes were first introduced by Gallager over 40 years ago. Over the last two decades, such codes have been the subject of intense research, and capacity approaching sparse graph codes with low complexity encoding and decoding algorithms have been designed for many channels. Motivated …
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Adaptation For Multi-Antenna Systems
… to adapt MIMO systems in the presence of varying channel conditions typically focus on characterizing the performance of a limited and predefined set of joint MoDem/CoDec and MIMO configurations over a representative set of channel realizations. Other work has attempted to adapt only the MIMO …
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Distributed medium access control for an enhanced physical-link layer interface
… enhanced interface is supported by a distributed channel coding theory, which equips each physical layer user with an ensemble of channel codes. The coding theory allows each transmitter to choose an arbitrary code to encode its message without sharing such a decision with the receiver. The …
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Digital communication receiver algorithms and architectures for reduced complexity and high throughput
… near-optimal detection performance for MIMO channels. In order to improve the performance of tree detection, a look-ahead path metric is employed that accounts for the impact of unvisited paths of the tree via an unconstrained linear MMSE estimator. Based on an analysis of the probability of …
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Multi-dimensional direct-sequence spread spectrum multiple-access communication with adaptive channel coding
… systems. This scheme is known as adaptive channel coding, and gives a system the ability to firstly sense changes in conditions, and secondly, to adapt to these changes, exploiting the fact that under good channel conditions, a very simple or even no channel coding scheme can be used for …
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Deep code: representation and learning algorithms for neural networks & their applications to communication codes
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Near-capacity co-located and distributed MIMO systems
… namely on Generalized Multi-Layer Space-Time Codes (GMLST), which may be viewed as a composite of V-BLAST and STC, hence they provide both multiplexing and diversity gains. The basic decoding procedure conceived for our GMLST arrangement is a certain ordered successive decoding scheme, which …