| 1. |
- Alexander, Paul D., et al.
(författare)
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Filter structure for iterative signal processing
- 2002
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Patent (populärvet., debatt m.m.)abstract
- The present invention relates to improved multiple access communications. In one form, the invention relates to an improved signal processing method and apparatus for an iterative method of determining the reception of a signal in a multi user packet based wireless OFDM (Orthogonal Frequency Division Multiplexing) communication system. In other forms the present invention provides recursive filtering for joint iterative decoding in a variety of systems and functions such as linear multiple access channel decoders, iterative equalisation, iterative joint channel estimation and detection/decoding, iterative space-time processing, iterative multi user interference cancellation and iterative demodulation.; In one particular form the present invention provides an iterative decoding circuit for a wireless multiuser communications receiver comprising a first signal processing means for receiving at least one received signal, said first signal processing means comprising at least two linear iterative filters such that the first linear iterative filter provides an estimate of a selected received signal to an estimated signal output and a second linear iterative filter provides estimates of at least one other received signal, delayed by one iteration cycle, to an input of said first linear iterative filter, a second signal processing means for receiving the estimated signal output of the first linear iterative filter and providing a further received signal estimate to the input of the first signal processing means in a succeeding iteration cycle of the decoding circuit.
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| 2. |
- Alexander, Paul D., et al.
(författare)
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Filter structure for iterative signal processing
- 2002
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Patent (populärvet., debatt m.m.)abstract
- The invention is an iterative signal processing arrangement having one or more pairs of first and second signal processing components. These pairs are in iterative configuration with each of the first signal processing components having as its input one or more received signals dependent upon one or more transmitted signals. For each said signal processing component pair the output of said first signal processing component is an estimate of a characteristic of a selected transmitted signal based on the current and one or more previous input signals received by said first signal processing component. This estimate is input to said corresponding second signal processing component which provides a further estimate of said selected transmitted signal. The outputs of all said second components of respective pairs are input to their corresponding first components in a succeeding iteration cycle.
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| 3. |
- Bergenheim, Jon, et al.
(författare)
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Ekosläckning
- 2002
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Patent (populärvet., debatt m.m.)abstract
- The present invention relates to a cancellation of echoes in telecommunications systems, more specifically it relates to adaptive alignment of a linear filter (500) used for echo cancellation. According to the invention, it is continuously determined, by means of control logic (520), if a reflection replica delay included in an echo replica signal (110), which delay is provided by a signal buffer (510), should be attempted to be increased or not. Similarly, it is continuously determined if the reflection replica delay should be attempted to be decreased or not. In this way it is possible to provide a delay of the reflection replica which corresponds to the pure delay of a corresponding reflection included in an echo signal (120) received over an echo path. The invention is advantageous since the filter (500) will continuously and quickly adapt to changes in the echo path delay by continuously increasing or decreasing, in an incremental and smooth manner, a present replica delay.
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| 4. |
- Bergström, Anders, 1965-
(författare)
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Kultiverat bland kultiverade grannar
- 2002
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Ingår i: Arkitektur. - Stockholm : Arkitektur förlag. - 0004-2021. ; :6, s. 33-33
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 5. |
- Danielsson, Mats, Professor, et al.
(författare)
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Diagnostic and therapeutic detector system for imaging with low and high energy X-ray and electrons
- 2002
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Patent (populärvet., debatt m.m.)abstract
- A detector unit for detecting photons in the energy range 1 keV to 100 MeV, includes at least two converter layers adapted to interact with incident X-ray photons and to cause electrons to be emitted therefrom, at least one amplifier adapted to interact with the electrons emitted from the converters and adapted to produce a multiplicity of secondary electrons and photons representing a signal proportional to the incident fluence of X-ray photons, a connector connecting the detector to an electric field generator providing an electric drift field for secondary electrons in the detector, and a sensor device arranged to receive the signal and provide an input to electronic signal processor.
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| 6. |
- Danielsson, Mats, Professor
(författare)
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Radiation detector for calibrating and verifying radiosurgical equipment, contains several detector elements each producing individual induced currents for creating multi dimensional radiation dose distribution
- 2002
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Patent (populärvet., debatt m.m.)abstract
- The detector (20) includes several adjacent detector elements each defining a limited detection area and each being configured to produce an individual current dependent upon the radiaiton dose in each respective area. A means (34-36) is provided for measuring each individual current to obtain data used to create an expression over the dose distribution in at least two dimensions. A radiation detector unit for determining the radiation dose distribution or rate from at least one radiation source (2) comprises a detector in which a current induced by the radiation source is dependent on the dose, and a means for measuring the induced current. The detector includes several adjacent detector elements each defining a limited detection area and each being configured to produce an individual current dependent upon the radiaton dose in each respective area. A means is provided for measuring each individual current to obtain data used to create an expression over the dose distribution in at least two dimensions. Independent claims are also included for (a) a radiation dose detection system for verification or calibration of radiosurgical equipment, comprising one or more radiation sources, a control system, a means for registering radiation doses, a means for combining the doses to generate a dose distribution, and the above detector unit, and (b) a method for generating a three-dimensional radiation dose distribution from at least one radiation source. INSTRUMENTS AND TESTING - CLAIMED METHOD: The detector unit is moved from a starting position to a region near the radiation source, where it is exposed to radiation from the source for a given time period, and then the unit is returned to its starting position. A set of radiation dose values are built up for a number of detection areas and combined into a three-dimensional distribution.
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| 7. |
- Danielsson, Mats, et al.
(författare)
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X-ray protection device
- 2002
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Patent (populärvet., debatt m.m.)abstract
- The present invention relates a shielding arrangement (27, 47, 57, 77) in an x-ray apparatus (20, 40, 400), preferably for mammography examination, at least comprising an x-ray source (21, 41), a collimator arrangement (22, 42) and a detector assembly (23, 43), whereby said collimator is arranged between said x-ray source and said detector assembly and through which x-rays pass. The shielding arrangement (27, 47), at least partly made of x-ray blocking material and provided for blocking scattering and/or reflecting x-rays is arranged, at least partly, in a space between in said x-ray source (21, 41) and collimator (22, 42).
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| 8. |
- Grillner, Katja
(författare)
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Lewerentz
- 2002
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Ingår i: Dagens Nyheter. - Stockholm.
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 9. |
- Gusarov, V.V., et al.
(författare)
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Method for producing ceramic materials incorporating ferric oxide, alumina, and silicon dioxide for nuclear-reactor molten core trap
- 2002
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Patent (populärvet., debatt m.m.)abstract
- NOVELTY - Production of ceramic materials for nuclear reactor molten core trap involves preparation of charge by milling and mixing components, and producing molding powder from charge. This molding powder is molded and formed into briquettes, which are calcined in an air environment at 1300 - 1380 degreesC for 2-14 hr. The briquettes are crushed, the powder is milled and sized to fractions, and mixed with binder. The parts are molded and calcined at 1200-1300 degreesC for 4-14 hr. Silicon dioxide and part of the alumina are introduced into the charge as kaolin, whose content is higher than the desired content of silicon dioxide in material by 2.1-2.3 times. USE - In nuclear power engineering, for confining molten core in water-cooled tank reactors. ADVANTAGE - Enhanced reproducibility of physical and mechanical properties of molten core sacrificial ceramic materials.
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| 10. |
- Hammarén, Maria
(författare)
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Yrkeskunnande, berättelser och språk
- 2002
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Ingår i: Industrisamhällets kulturarv. - Stockholm : Statens offentliga utredningar. - 9138217260 ; , s. 107-120
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Bokkapitel (populärvet., debatt m.m.)
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