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- Falahati, Sorour, 1971, et al.
(författare)
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EU FP6 IST-2003-507581 WINNER, D2.4 Assessment of adaptive transmission technologies, Feb 2005
- 2005
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This document contains a first assessment of adaptive transmission schemes and how these fitto the different WINNER scenarios. It focuses on an adaptation due to the channel properties that mayvary both in time and frequency or, with respect to the selected antennas, in an OFDM-based air interface.Besides the evaluation by analysis, link simulation and multilink simulation, first detailed designs arepresented of adaptive transmission feedback systems for the WINNER FDD and TDD physical layermodes.
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- Olander, Jenny, et al.
(författare)
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Laser-Assisted Atomic Layer Deposition of Boron Nitride Thin Films
- 2005
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Ingår i: Chemical Vapor Deposition. - : Wiley. - 0948-1907 .- 1521-3862. ; 11, s. 330-337
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Tidskriftsartikel (refereegranskat)abstract
- Boron nitride thin films have been grown by both laser-assisted, and conventional atomic layer deposition (LALD/ALD) at temperatures in the range 250-750 °C. Both the NH3 and BBr3 precursors were appreciably dissociated by the ArF excimer laser, and up to 600 °C, the growth rate was 100 % higher for the LALD process than for ALD. The films consisted of hydrogen-terminated turbostratic BN grains. H2 was theoretically found to bind as strongly as BBrX and NHX (X = 0-2) to hBN(100) edges. The fresh films were stoichiometric with respect to B and N, and contained low degrees of contamination, but oxidized easily in air.
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| 5. |
- Törndahl, Tobias, et al.
(författare)
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Epitaxy of copper on α-Al2O3(0 0 1) by atomic layer deposition
- 2005
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Ingår i: Journal of Crystal Growth. - : Elsevier BV. - 0022-0248. ; 276, s. 102-110
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Tidskriftsartikel (refereegranskat)abstract
- A combined X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) study have been carried out on copper films grown by atomic layer deposition at 400 °C. The copper films have been grown on single crystalline (0 0 1) oriented α-Al2O3 up to a thickness of 500 nm. The films were relaxed and the diffraction peak broadening in 2θ was mainly dependent on the copper grain size. Broadening of the diffraction peaks in ω was found to be related to defects (mosaicity and intrinsic microstrain). The deposited films were epitaxial and grew with the (1 1 1) plane in parallel to the substrate surface. Extensive twinning in the copper grains in different Cu1 1 1 directions occurred according to the TEM study, both in directions perpendicular to the substrate surface ([1 1 1] and ) and along other 1 1 1 directions as well. As an effect of a twin, an extra Cu(5 1 1) orientation was present in the XRD data.
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| 7. |
- Wang, Wei, 1965, et al.
(författare)
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Evaluations of a 4G Uplink System Based on Adaptive Single-Carrier TDMA
- 2005
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Ingår i: Proceedings IEEE Vehicular Technology Conference Fall, Dallas, Texas, USA. - 1550-2252. - 0780391527 ; , s. 1667-1671
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Konferensbidrag (refereegranskat)abstract
- © 2005 IEEE. Recent research has shown that a single-carrier system with frequency domain equalization can be a potential alternative to an OFDM-based system in a single user case. In this paper we propose and evaluate an adaptive single-carrier TDMA uplink with scheduling for broadband cellular packet data systems. Frequency division duplex (FDD) is assumed. Multiuser channel estimation and channel prediction are considered. The adaptive modulation scheme is optimized to maximize the throughput including also the ARQ part of the transmission. Frequency domain equalization is employed to combat the inter-symbol-interference (ISI). With the proposed design, the simulation results show that the multiuser diversity gain in spectral efficiency is limited in a wideband system, which indicates that an OFDM based system might be a more favorable candidate.
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