Sökning: "multiple access"

Visar resultat 36 - 40 av 493 avhandlingar innehållade orden multiple access.

  1. 36. Single-photon multiple ionisation of atoms and molecules investigated by coincidence spectroscopy : Site-specific effects in acetaldehyde and carbon dioxide

    Författare :Sergey Zagorodskikh; Raimund Feifel; Vitali Zhaunerchyk; Melanie Mucke; Maria Novella Piancastelli; Tom Field; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; acetaldehyde; carbon dioxide; xenon; electron correlation; double ionisation; triple ionisation; core-valence ionisation; site-specific Auger decay; multiple Auger decay; branching ratios; site-specific photodissociation; molecular rearrangement; time-of-flight multi-electron-ion coincidence spectroscopy; synchrotron radiation; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : In this thesis, multiple ionisation processes of free atoms and molecules upon single photon absorption are studied by means of a versatile multi-electron-ion coincidence spectroscopy method based on a magnetic bottle, primarily in combination with synchrotron radiation. The latter offered the possibility to access not only valence but also core levels, revealing processes, which promote the target systems into different charge states. LÄS MER

  3. 37. Synchronization and data detection in long-code CDMA systems / Pei Xiao %C Göteborg

    Författare :Pei Xiao; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; iterative demodulation; Rayleigh-fading channels; acquisition; tracking; long spreading codes; multiuser detector; additive white Gaussian noise AWGN ; short spreading codes; data detection; synchronization; channel estimation; direct sequence code division multiple access DS-CDMA ; orthogonal modulation; delay estimator; multiple access interference MAI ;

    Sammanfattning : .... LÄS MER

  4. 38. Tailoring Pairwise Non-Orthogonal Multiple Access to the Requirements of Critical Cyber-Physical Systems

    Författare :Van-Lan Dao; Elisabeth Uhlemann; Le-Nam Hoang; Svetlana Girs; Fredrik Brännström; Mälardalens högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Computer Science; datavetenskap;

    Sammanfattning : Within the context of Industry 4.0, many devices have become more intelligent and connected, leading to challenges on how to meet the stringent requirements on latency and reliability in networks of critical cyber-physical systems. In particular, timely channel access and high reliability are of essence to guarantee real-time deadlines. LÄS MER

  5. 39. Threshold and Temperature Characteristics of InGa(N)As-GaAs Multiple Quantum Well Lasers

    Författare :Göran Adolfsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; GaAs; Semiconductor lasers; molecular beam epitaxy; multiple quantum wells; characteristic temperature; temperature dependence; dilute nitrides; ambipolar diffusion; InGa N As;

    Sammanfattning : Semiconductor lasers emitting in the 1.3 μm regime are of interest for applications in access-networks like fiber-to-the-home and radio-over-fiber systems. Suchfiber optical networks are expected to replace the copper-based access-networks currently in use due to a continuously increasing demand on user bandwidth. LÄS MER

  7. 40. Guidance and Control for Multiple Spacecraft Formation

    Författare :Sumeet Gajanan Satpute; George Nikolakopoulos; Per Bodin; Kazuya Yoshida; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Spacecraft Formation; Concurrent maneuver planning; Co-location; Geostationary satellite; Asteroid visual coverage; Trajectory planning; Traveling salesman problem; Onboard space systems; Rymdtekniska system;

    Sammanfattning : Multiple spacecraft formation forms a distributed space system where multiple spacecraft cooperatively exhibit the functionality of a single monolithic spacecraft or work in a cooperative way towards the completion of a common goal. This possibility of distributing the workload between different spacecraft provides the ability to work in parallel, enable economic and simple solutions in terms of spacecraft design, while is redundant towards partial or complete failure of a spacecraft. LÄS MER