| 1. |
- Astély, David, et al.
(författare)
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Spatial signature estimation for uniform linear arrays with unknown receiver gains and phases
- 1999
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Ingår i: IEEE Transactions on Signal Processing. - : Institute of Electrical and Electronics Engineers (IEEE). - 1053-587X .- 1941-0476. ; 47:8, s. 2128-2138
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Tidskriftsartikel (refereegranskat)abstract
- The problem of spatial signature estimation using a uniform linear array (ULA) with unknown receiver gain and phase responses is studied. Sufficient conditions for identifying the spatial signatures are derived, and a closed-Form ESPRIT-like estimator is proposed, The performance of the method is investigated by means of simulations and on experimental data collected with an antenna array in a suburban environment. The results show that the absence of receiver calibration is not critical for uplink signal waveform estimation using a plane wave model.
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| 2. |
- Asztély, David, et al.
(författare)
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A Generalized Array Manifold Model for Local Scattering in Wireless Communications
- 1997
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Ingår i: Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing. ICASSP-97. - : IEEE. ; , s. 4021-4024
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Konferensbidrag (refereegranskat)abstract
- In wireless communication scenarios, local scatterers in the vicinity of the mobile sources cause angular spreading. As a result, the spatial signatures will not belong to the conventional array manifold parameterized by direction of arrival (DOA) alone. A parameterized model for spatial signatures applicable in scenarios with localscattering is presented. Several algorithms that exploit this model are proposed, and the performance of signal waveform estimators using the model is investigated via simulations. It is demonstrated that considerable gain may result as compared with using the conventional plane wave model.
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| 3. |
- Asztély, David, et al.
(författare)
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Auto Calibration for Signal Separation with Uniform Linear Arrays
- 1997
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Konferensbidrag (refereegranskat)abstract
- In this paper, the problem of signal waveform estimation using a uniform linear array with unknown receiver gain and phase responses is considered. As is well known, it is not possible to uniquely estimate directions-of-arrival(DOAs) and receiver gain and phase simultaneously. For steering vector and signal separation this ambiguity is notcritical. An ESPRIT-like solution is presented, and the proposed method is examined on data collected with an antenna array in a suburban environment.
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| 4. |
- Asztély, David, et al.
(författare)
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Generalised Array Manifold Model for Wireless Communication Channels with Local Scattering
- 1998
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Ingår i: IEE Proceedings Radar, Sonar and Navigation. - : IEEE. - 1350-2395. ; 145:1, s. 51-57
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Tidskriftsartikel (refereegranskat)abstract
- The authors propose the use of a generalised array manifold for parameterised spatial signature estimation in wireless communication channels with local scattering. The array manifold commonly used for point sources is generalised to include linear combinations of the nominal array response vectors and their derivatives. The motivation behind this idea is to obtain better estimates of the spatial signatures for direction of arrival (DOA) based signal waveform estimation. The estimators proposed exploit the orthogonality between the so-called noise and signal subspaces, leading to a separable solution for the derivative coefficients. As a result, a search is required for the DOAs only. For uniform linear arrays, the spatial signatures are shown to be approximately Vandermonde vectors with damped modes, and a closed-form estimator such as ESPRIT may be used in this case. Simulation examples are included to compare the signal estimation performance obtained using the proposed generalised manifold and the conventional array manifold.
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| 5. |
- Lee, David N., et al.
(författare)
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Perception action approach to cerebral palsy
- 1997
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Ingår i: Neurophysiology and Psychology of Motor Development. - : Mac Keith Press. - 9781898683100 ; , s. 257-285
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Bokkapitel (refereegranskat)
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