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- Nordholm, Sven, et al.
(författare)
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Superresolution Effects in Broadband Antenna Arrays
- 1990
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Konferensbidrag (refereegranskat)abstract
- The problem of finding the angular 3-dB beamwidth for a wideband Griffiths-Jim adaptive beamformer is discussed. Approximate analytic expressions are presented and their relation to the Cramer-Rao bound (CRB) is considered. Results on the CRB in DOA (director of arrival) estimation for a sinusoidal signal are extended to narrowband and broadband signals, together with simple interpretations of their behavior. Superresolution results with five-element array for three target signal bandwidths (400-2000, 800-1600, and 1120-1280 Hz) are presented.
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- Claesson, Ingvar, et al.
(författare)
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Wiener Solution for the Broadband Griffiths-Jim Beamformers
- 1990
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Konferensbidrag (refereegranskat)abstract
- The problem of finding the Wiener filters for a wideband adaptive beamformer is treated. Explicit expressions are given for the filters and the error power spectrum in the frequency domain. The expressions are simple to program and make it possible to investigate superresolution for wideband signals and to determine sufficient lengths of finite-impulse-response filters in adaptive arrays.
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- Svensson, Anders
(författare)
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History, an Intelligent Load Sharing Filter
- 1990
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Konferensbidrag (refereegranskat)abstract
- The author proposes a filter component to be included in a load-sharing algorithm to detect short-lived jobs not worth considering for remote execution. Three filters are presented. One filter, called History, detects short-lived jobs by using job names and statistics based on previous executions. Job traces are allocated from diskless work stations connected by a local area network and supported by a distributed file system. Trace-driven simulation is then used to evaluate History with respect to the other filters. Two load-sharing algorithms show significant improvement of the mean job response ratio when the History filter is added.
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