| 1. |
- Rasmussen, F. Berg, et al.
(författare)
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The NNO defect in silicon
- 1995
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Ingår i: Proceedings of the 18th International Conference on Defects in Semiconductors. - : Trans Tech Publications Inc.. ; , s. 791-796
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Konferensbidrag (refereegranskat)abstract
- Nitrogen-oxygen complexes in silicon have been studied by infrared absorption spectroscopy on samples implanted with various combinations of O and N isotopes as well as O-rich samples doped with N during growth. Local vibrational modes at 805, 999 and 1030 cm-1 (14N, 16O) are directly shown to belong to a defect consisting of a N-pair interacting with an O interstitial. A recently proposed model of this NNO defect is further investigated by ab initio cluster calculations and found to account for the dynamical properties of the defect. A mode around 730 cm-1 predicted by the calculation is observed giving further support to the model.
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| 2. |
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| 3. |
- Rasmussen, Lars K., et al.
(författare)
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Convergence of linear successive interference cancellation in CDMA
- 1997
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Ingår i: Proceedings Workshop on Multiaccess, Mobility and Teletraffic for Personal Communication, Melbourne, Australia. - Boston, MA : Springer US. ; , s. 13-27
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Konferensbidrag (refereegranskat)abstract
- In this paper we consider a matrix-algebraic approach to linear successive interference cancellation (SIC). It has been shown that both single- and multi-stage linear SIC schemes correspond to a one-shot linear matrix filtering. Eigenvalue conditions on the resulting linear filter for convergence of the multistage scheme are considered and the concept of e-convergence is introduced for determining the number of stages necessary for practical convergence. It is observed that the BER for the users does not generally reach its minimum when the scheme converges, hence, optimal performance is achieved after a limited number of cancellation stages, which does not have to be the same for different users.
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| 4. |
- Rasmussen, Lars K., et al.
(författare)
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One-shot filtering equivalence for linear successive interference cancellation in CDMA
- 1997
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Ingår i: Proceedings IEEE Vehicular Technology Conference, Phoenix, Arizona, May 04-07. ; , s. 2163-2167
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Konferensbidrag (refereegranskat)abstract
- We consider a matrix-algebraic approach to linear successive interference cancellation (SIC). It is shown that both single- and multi-stage linear SIC schemes correspond to a one-shot linear matrix filtering that can be performed directly on the received chip-matched filtered received vector without explicitly performing the interference cancellation. This description allows for determining the bit error rate analytically. Also eigenvalue conditions for convergence of the multi-stage scheme are derived and the concept of ε-convergence introduced for determining the number of stages necessary for practical convergence.
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