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 20 of 619 for “"DS"”.
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Measurement of the Partial Widths Ratio Gamma(Ds*+ -> Ds+ pi0) / Gamma(Ds*+ -> Ds+ gamma) at the BABAR Experiment
… 1999 bis 2002 genommen hat, wurden die Zerfälle Ds*+ -> Ds+ pi0 und Ds*+ -> Ds+ gamma mit zwei verschiedenen Methoden rekonstruiert. Die Rekonstruktions-Effizienzen wurden mittels Signal-Monte Carlo-Ereignissen und D*0-Zerfällen ermittelt. Auf diese Weise wurde das Partialbreiten-Verhältnis …
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Measurement Of Branching Fractions Of Rare Semi-Leptonic Ds Decays Ds → π0 L ν, Ds →ρ L ν, Ds →ks L ν (near ϒ (4s), ϒ (5s)) At Belle
… ϒ (4S) and ϒ (5S) energy regions, to look for Ds → π0 l ν, Ds →ρ l ν, Ds →Ks l ν ; considering the electron candidates as well the heavy electron counterpart muon candidates as the leptons. The reconstruction of e+ e- → cc ̅ containing Ds meson events proceeds in two steps. In the first step …
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Data Chunking in Quasi-synchronous DS-CDMA
<p>DS-CDMA is a popular multiple access technique used in many mobile networks to efficiently share channel resources between users in a cell. Synchronization between users maximizes the user capacity of these systems. However, it is difficult to perfectly synchronize users in the reverse link due …
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Provozování vložených kabelových vedení do DS vvn
… mezi venkovní vedení distribuční soustavy VVN. Podstatou je popis přínosů, rizik a dopadu provozování těchto úseků z pohledu chránění a přechodových dějů. Práce také zahrnuje ekonomické porovnání provozních a pořizovacích nákladů části vedení s vloženým kabelem nebo venkovní linkou. Téma práce …
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Study of Ds and D*s mesons
Hadronic decays of the Ds are studied in e+ e- annihilation at center-of-mass energy 4.14 GeV /c2. The data were collected with the Mark III detector at the storage ring SPEAR at the Stanford Linear Accelerator Center. [Abstract continued in document]
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Adaptive interference suppression algorithms for DS-UWB systems
… symbol by symbol transmission multiuser DS-UWB systems are considered. We first investigate a generic reduced-rank scheme based on the concept of joint and iterative optimization (JIO) that jointly optimizes a projection vector and a reduced-rank filter by using the minimum mean-squared …
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Partial DS-CDMA for mobile satellite data networks.
… direct sequence code division multiple access (DS-CDMA) is used, this need not to be the case, because the DS-CDMA system allows many packets to coexist in a given slot. Thus packets are correctly received with certain probability which depends on the simultaneous number of packets in the slot. …
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Search For The Decay Ds To Omega L Nu
… detector.</p> <p>A limit on the branching ratio Ds to omega e nu is found, at 0.231\%</p> <p>(95\% C.L.).</p>
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Optimization of Soft Interference Cancellation in DS-CDMA Receivers
Parallel interference cancellation for DS-CDMA has been shown to suffer from biased amplitude estimates if a matched-filter estimator is used. The bias magnitude is proportional to the number of interfering users. For heavy system loads, the bias has been shown to adversely effect the accuracy of …
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Pre-equalization for pre-Rake MISO DS-UWB systems
… (MISO) direct-sequence ultra-wideband (DS-UWB) systems with pre-Rake combining and symbol-by-symbol detection. The first pre-equalization filter (PEF) scheme employs one PEF per transmit antenna, whereas in the second, simplified PEF (S-PEF) scheme all transmit antennas share the same …
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Multi-user detection for multi-rate DS/CDMA systems
… and range of services. Current and future demands for wireless communication services motivate the need for handling multi-media traffic types. In a multimedia communication system, users with different and even time-varying rates and quality of services (QoS) requirements, such as voice, image …
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Channel estimation and signal enhancement for DS-CDMA systems
… direct-sequence code-division multiple-access (DS-CDMA) systems. Using the Bayesian framework, various linear and simplified nonlinear multiuser detectors are proposed, and their performances are analyzed. The simplified non-linear Bayesian solutions can bridge the performance gap between …
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A channel-shortening multiuser detector for DS-CDMA systems
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Efficient Interference Cancellation Techniques for Advanced DS-CDMA Receivers
… derived. Based on this approach, two real-time DSP implementations are devised, one fully coherent and one non-coherent. Multi-symbol differential detection is then explored as an alternative for improving the performance of the non-coherent approach. Additionally, dual-antenna diversity …
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Uplink Power Control and Soft Handoff Prioritization in Multimedia DS-CDMA
In the CDMA cellular networking system, power control is a very important issue because it is an interference limited system. In order to reduce the near-far problem and improve the battery life of mobile station, the transmit power of mobile stations must be controlled to limit interference. In …
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Regulation of maize Ac/Ds transposition by replication and DNA methylation
… transposable elements Activator/Dissociation (Ac/Ds) transpose shortly after replication from one of the two resulting chromatids ("chromatid selectivity"). A model was suggested that explains this phenomenon as a consequence of different Ac transposase binding to holo-, hemi- and unmethylated …
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Performance of Ds/ssma Communications in Impulsive Channels (Nongaussian, Hard Limiter)
… spreading sequences. Computationally simple methods are proposed for approximating the average error probability of the linear and hard-limiting correlation receivers when the length of the signature sequences is large. Furthermore, for linear and nonlinear correlation receivers some asymptotic …
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