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 13 of 13 for “"Bell Labs"”.
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Skew estimation for document images
… of Washington, Xerox PARC, Siemens AG, AT&T Bell Labs, and Hitachi Central Research Lab.
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R&D organizational reform to provide profitable products
… and financial difficulties. A case study of Bell Labs is also included, because of its similar situation and problems. Two critical internal organizational factors for providing profitable product are identified; marketing, and judgment of the development topics. A recommendation is given to …
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Performance Analysis of Space-Time Coded Modulation Techniques using GBSB-MIMO Channel Models
… capacities. Space-Time Block Coding (STBC) and Bell Labs Layered Space-Time Architecture (BLAST) are two potential schemes which utilize the diversity offered by MIMO channels to provide reliable high date rate wireless communication. This work studies the sensitivity of these two schemes to …
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Estudio experimental de algoritmos espacio-temporales para sistemas multiantena en túneles
… los sistemas multiantena: el algoritmo Vertical Bell Labs Space Time (VBLAST), los códigos Orthogonal Space Time Block Codes (OSTBC) y los códigos Quasy-Orthogonal Space Time Block Codes (QSTBC). El rendimiento de estos algoritmos, según la tasa de error de bit (BER, Bit Error Rate), se relaciona …
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Channel Estimation Strategies for Coded MIMO Systems
… estimation strategies for an iterative Vertical Bell-Labs Layered Space Time (V-BLAST) architecture. The channel estimate can be sequentially improved between successive iterations of the iterative V-BLAST algorithm. For both the coded and uncoded systems, at high signal to noise ratio only a …
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Efficient signal, code, and receiver designs for MIMO communication systems
… versions and develop new block versions of the Bell Labs layered architecture (BLAST). While some of these can in principle reach the performance limit at all SNRs, we show they also have various practical problems.
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Space-Time Codes for High Data Rate Wireless Communications
… to solve the error propagation problem of Bell-Labs Layered Space-Time Architecture (BLAST). Results show that remarkable energy and spectral efficiencies are achievable by combining concepts drawn from space-time coding, multiuser detection, array processing and iterative decoding.
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Different Multiple Input Multiple Output Systems
… potential of the MIMO scheme. VBLAST (Vertical-Bell Labs Space Time) is a popular architecture that will play an important role in future standardizations. Furthermore, different decoding methods have been proposed for VBLAST. The SVD (Singular Value Decomposition) based system is envisioned as …
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Performance investigation of spatial modulation systems under realistic channel models
… other MIMO technologies, such as the vertical Bell Labs layered space-time (V-BLAST), the Alamouti scheme are compared with SM under different simulation settings. Secondly, the BER performance of SM systems is studied under a non-stationary wideband HST GBSM considering the non-ideal channel …
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Multi-function RF for Situational Awareness
… (CSI) at the transmitter. Built on the Diagonal Bell-Labs Layered Space-Time (D-BLAST) MIMO architecture, the system integrates three key design approaches: spatial spreading to counter antenna blockage; temporal spreading to mitigate signal to interference and noise ratio degradation due to …
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Αποδοτικές τεχνικές εκτίμησης – ισοστάθμισης γενικευμένων ασύρματων καναλιών πολλαπλών εισόδων – πολλαπλών εξόδων
… η πρωτοποριακή έρευνα που πραγματοποιήθηκε στα Bell labs στα μέσα της δεκαετίας του ΄90, απέδειξε ότι η χρήση πολλαπλών κεραιών μπορεί να οδηγήσει σε σημαντική αύξηση της χωρητικότητας των ασύρματων συστημάτων βελτιώνοντας την αξιοπιστία της μετάδοσης. Προκειμένου να αξιοποιηθούν οι παραπάνω …
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Exploring Low Brass Recording Techniques
<p>The modern day art and science of music recording evolved through a constant process of trial and error. Although many of these techniques are well-documented and commonplace in modern recording studios, most of them are generalized recording techniques used in the popular and classical music …
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Near-capacity co-located and distributed MIMO systems
… multiplexing techniques such as the Vertical Bell-labs LAyered Space-Time (V-BLAST) scheme exploit the associated multiplexing gain in terms of an increased bit rate, whereas spatial diversity techniques such as Space-Time Coding (STC) aim for achieving a diversity gain, which results in a …