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 14 of 14 for “"Turbo Equalization"”.
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Turbo equalization using message passing methods with higher order modulation signaling
… (ISI) channel. Since the discovery of turbo codes, iterative decoding has become a vital field of research in digital communications. The turbo equalization is a widely used iterative receiver technique which has high performance of bit error rate (BER). Many turbo equalization …
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Advanced receivers for space-time block-coded single-carrier transmissions over frequency-selective fading channels
… (FSF) channels. First, we develop an MMSE-based turbo equalization scheme for Alamouti ST block-coded systems. A semi-analytical method to estimate the bit error rate (BER) is devised. Our results show that the proposed turbo equalization scheme offers significant performance improvements over …
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Low complexity turbo equalizations and lower bounds on information rate for intersymbol interference channels.
In this research, low complexity turbo equalization algorithms are examined as an alternatives to the optimal, but, much more complex, Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm. First, the soft-in soft-out (SISO) decision feedback equalizer (DFE) algorithm with the extrinsic information mapping …
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Direct-form adaptive equalization for underwater acoustic communication
Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is subject to the effects of time- varying multipath fading and Doppler spreading. The …
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Direct-form adaptive equalization for underwater acoustic communication
Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is subject to the effects of time- varying multipath fading and Doppler spreading. The …
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Equalization Using Graphical Models
We examine the use of graphical models for the equalization of digital communication channels with memory. Graphical models provide a framework in which the structure of large systems can be exploited to derive efficient estimation algorithms. Furthermore, properties of a graph on which an …
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Sparse nonlinear optimization for signal processing and communications
… radar (SAR) image reconstruction, and adaptive turbo equalization in multiple-input multiple-output (MIMO) underwater acoustic (UWA) communications, respectively.</p> <p>For NEC, the proposed two proportionate affine projection sign algorithms (APSAs) utilize the sparse nature of the network …
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Reduced Receivers for Faster-than-Nyquist Signaling and General Linear Channels
… is often prohibitively complex, and alternative equalization methods with acceptable complexity-performance tradeoffs are needed. The key objective of this thesis is therefore to design reduced-complexity receivers for FTN and general linear channels that achieve optimal or near-optimal …
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Turbo coding and equalization for wireless communication systems
Turbo coding, a forward error correcting coding (FEC) technique, has made near Shannon Limit performance possible when Iterative decoding algorithms are used. Intersymbol interference (ISI) is a major problem in communication systems when information is transmitted through a wireless channel. …
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Communication and time distortion
… and compensated. Integrated into an iterative turbo equalization based receiver, this novel Doppler compensation technique has demonstrated unprecedented communication performance in US Navy sponsored field tests and simulations. We achieved a data rate of 39kbps at a distance of 2.7km and a …
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Joint Equalization and Decoding via Convex Optimization
… has been some resistance to the deployment of turbo-equalization (TE) structures (with iterative detectors/decoders) in magnetic-recording systems because of error floors and the difficulty of accurately predicting performance at very low error rates. To address this problem for channels with …
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Channel Estimation in Single -Carrier and Multi-Carrier Communication Systems
… developments in communication technology such as turbo receivers and multi-carrier communication systems, which have influenced recent standards, e.g., IEEE 802.11 and IEEE 802.16. Regardless of the communication systems, channel state information is required for reliable demodulation, and …
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Channel matched iterative decoding for magnetic recording systems.
… is a two-level concatenation of channel-matched turbo equalization (TE) and outer RS, replacing current inner parity correction codes. Conventional TE is matched to the channel via the incorporation of the error pattern correction code (EPCC), which works iteratively with the other constituent …
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Digital communication receiver algorithms and architectures for reduced complexity and high throughput
… algorithms. Third, a computationally efficient turbo equalization algorithm for underwater acoustic communications is studied. The performances of two popular linear turbo equalizers, a channel estimate-based minimum mean square error TEQ (CE-based MMSE-TEQ) and a direct-adaptive TEQ (DA-TEQ) …