| 1. |
- Jönsson, Gustav, et al.
(författare)
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A microcomputer pausemeter for linguists
- 1982
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Ingår i: Working Papers (Lund University, Department of Linguistics). - 0280-526X. ; 24
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Arias, Marvin, et al.
(författare)
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A Generalized Angle Domain Clusters PDF and Its Application in Geometrically Based Channel Models
- 2005
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Ingår i: Procedings de IEEE ICICS 2005 Conf. Bangkok, Tailandia. ; , s. 1339-1343
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Konferensbidrag (refereegranskat)abstract
- In this paper we present analytical expressions for the angle-of-arrival (AOA) power density function (PDF) and its application in geometrically based channel models for urban environments. We make comparisons with experimental results for wideband channel models, published in the open literature, in order to evaluate the theoretical clusters PDF in angle domain proposed. The comparison with experimental results shows good agreement. The generalized clusters PDF derived in this paper can be used to simulate a power-delay-angle profile and to quantify second order statistics, i.e., angle spread for a given elliptical shape of the cluster.
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| 3. |
- Arias, Marvin, et al.
(författare)
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Clusters PDF in Angle and Time Domain for Geometrically Based Channel Model
- 2004
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Ingår i: Proceedings of International Symposium on Intelligent Signal Processing and Communication Systems. - 0780386396 ; , s. 433-438
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Konferensbidrag (refereegranskat)abstract
- Advanced radio system designs have been proposed that are intended to overcome or even take advantage of the radio channel caused by multipath effects in urban environments to achieve even higher performance. We present analytical expressions for the angle-of-arrival power density function (PDF) and general analysis for time of arrival (expressed in terms of distance) respectively, for the channel model based on geometry for urban environments. Then we make comparisons with experimental results published in the open literature, in order to evaluate the theoretical PDF proposed. The comparison with experimental results shows good agreement. The derived PDF can be used to simulate a power-delay-angle profile and to quantify angle spread and delay spread for a given elliptical shape of the cluster.
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| 4. |
- Arias, M R, et al.
(författare)
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An approach of the geometrical-based single bounce elliptical channel model for mobile environments
- 2002
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Ingår i: 8th International Conference on Communication Systems. ICCS 2002 (Cat. No.02EX585). - 0780375106 ; 1, s. 11-16
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Konferensbidrag (refereegranskat)abstract
- The simulation approach is an important tool used for the design and implementation of mobile radio systems with an emphasis on the propagation modeling for wireless channel. We carried out simulations for three different street positions scenarios of the receiver, (mobile station), using the geometrical-based single bounce elliptical channel model, as might be appropriate for microcellular applications and mobile-to-mobile communication. From the simulation results we use the parameters time-of-arrival (TOA) and angle-of-arrival (AOA), (delay and angular domain, respectively), to estimate the higher order channel statistics, such as the delay spread (DS) and the angle spread (AS), respectively
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| 5. |
- Arias, Marvin R., et al.
(författare)
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Clustering approach for geometrically based channel model in urban environments
- 2006
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Ingår i: IEEE Antennas and Wireless Propagation Letters. - 1548-5757. ; 5, s. 290-293
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Tidskriftsartikel (refereegranskat)abstract
- Advanced radio system designs have been proposed to overcome the radio channel caused by multipath effects in urban environments or even take advantage of it to achieve higher performance.. In this letter, we present a clustering approach to represent the power delay angle profiles (PDAPs) of the multipath components in urban environments. A cluster in an urban area originates from scattering points such as street apertures, large buildings, roof edges, or building corners. Unlike the previous geometrical models based only on single bounce reflection, our model represents the PDAPs by clusters plus background single bounce scatter components, i.e., waves that arrive at the receiver by double bounce at least. We present a numerical example for a typical outdoor scenario using the approach proposed for urban environments and including both temporal and spatial properties regarding path delay and angle-of-arrival (AOA).
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| 6. |
- Arias, Marvin, et al.
(författare)
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Time Domain Cluster PDF and Its Application in Geometry-Based Statistical Channel Models
- 2007
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Ingår i: Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2007). - 9781424411443 ; , s. 1-5
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Konferensbidrag (refereegranskat)abstract
- This paper presents an approach to derivate the Time of Arrival (TOA) power density function (PDF) and its application in geometry-based statistical channel models for urban environments. The cluster PDF derived can be used to simulate temporal dispersion of the multipath signal grouped in clusters in a variety of urban propagation conditions to quantify second order statistics, i.e., delay spread for a given elliptical shape of the cluster. We propose a clustering approach channel model, and employ it to derive the PDF of TOA of the multipath signal. In order to evaluate the theoretical clusters PDF in time domain proposed, we make computer simulations for the geometry-based channel model proposed and compared it with experimental results published in the open literature. The comparison with experimental results shows good agreement.
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| 7. |
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| 8. |
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| 9. |
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| 10. |
- Munguia Mena, Marco, et al.
(författare)
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Acoustical detection of venous stenosis in Hemodialysis patients using principal component analysis
- 2010
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Ingår i: [Host publication title missing].
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Konferensbidrag (refereegranskat)abstract
- In this paper, a feature extraction method based on principal component analysis was developed for classification of the vascular access’s condition in hemodialysis patients. The assessment of the method was carried out by discriminating between before and after angioplasty sound recordings as well as before angioplasty and reference recordings. The results showed that when before and after angioplasty recordings were compared by patient, the classification agreed with the result of angioplasty procedure. When all the available before and after angioplasty recordings were compared, it was still possible to discriminate them at a good rate. On the other hand, when the reference recordings substituted the after angioplasty recordings, almost a perfect discrimination was achieved.
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