| 1. |
- Asztély, David, et al.
(author)
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A Generalized Array Manifold Model for Local Scattering in Wireless Communications
- 1997
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In: Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing. ICASSP-97. - : IEEE. ; , s. 4021-4024
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Conference paper (peer-reviewed)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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| 2. |
- Asztély, David, et al.
(author)
-
Auto Calibration for Signal Separation with Uniform Linear Arrays
- 1997
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Conference paper (peer-reviewed)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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| 3. |
- Swindlehurst, Andrew Lee, et al.
(author)
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Some Experiments with Array Data Collected in Actual Urban and Suburban Environments
- 1997
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In: Proceedings of Signal Processing Advances in Wireless Communications, SPAWC 97. - : IEEE. ; , s. 301-304
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Conference paper (peer-reviewed)abstract
- We compare the performance of several algorithms for signal separation based on actual mobile cellular radiodata. The data were collected by base stations in two different environments: using an eight element lineararray on a hillside overlooking a suburban area, and using a four element square array at the top of a ten story building in a dense urban area. Calibration data were available for one of the arrays used for the suburban data, allowing for performance comparisons between DOA-based and blind signal separators. Experiments were conducted with three different types of signal waveforms: sinewaves, simple FM waveforms, and π/4-DQPSK signals, each of which necessitated the use of a different performance metric. We focus on the results obtained for cases where the data were approximately low rank, with little delay spread (although not all data sets from the urban environment were of this type)
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