A Framework for Developing and Evaluating Algorithms for Estimating Multipath Propagation Parameters from Channel Sounder Measurements

A framework is proposed for developing and evaluating algorithms for extracting multipath propagation components (MPCs) from measurements collected by channel sounders at millimeter-wave frequencies. Sounders equipped with an omnidirectional transmitter and a receiver with a uniform planar array (UPA) are considered. An accurate mathematical model is developed for the spatial frequency response of the sounder that incorporates the non-ideal cross-polar beampatterns for the UPA elements. Due to the limited Field-of-View (FoV) of each element, the model is extended to accommodate multi-FoV measurements in distinct azimuth directions. A beamspace representation of the spatial frequency response is leveraged to develop three progressively complex algorithms aimed at solving the singlesnapshot maximum likelihood estimation problem: greedy matching pursuit (CLEAN), space-alternative generalized expectationmaximization (SAGE), and RiMAX. The first two are based on purely specular MPCs whereas RiMAX also accommodates diffuse MPCs. Two approaches for performance evaluation are proposed, one with knowledge of ground truth parameters, and one based on reconstruction mean-squared error. The three algorithms are compared through a demanding channel model with hundreds of MPCs and through real measurements. The results demonstrate that CLEAN gives quite reasonable estimates which are improved by SAGE and RiMAX. Lessons learned and directions for future research are discussed.Comment: 17 page

Chemische Schule der Pharmacie oder Handbuch der Pharmakochemie : mit besonderer Berücksichtigung der österreichischen und preussischen Pharmakopöe ; für Apotheker und Ärzte

von Franz Doebereine

Maximum likelihood estimation of single X-ray point-source parameters in ROSAT data

The point source parameter estimation via Maximum Likelihood Estimation in ROSAT data is docu men ted. The infall of X-ray photons is treated as a Poisson process. Based on the Poisson model, the log-likelihood function for unbinned data is derived. The adopted source and background models are explained. In the chosen parameterization, the Maximum Likelihood equations and their numerical solution are expounded. The performance of the method is illustrated by an example and tests on simulated observations

Über Platinmohr und Eupion

n/

Trío de instrumentos antiguos de Munich, Christian Doebereigner (viola da gamba), Li Stadelmann (clave), Anton Huber (violín y viola d'amore) : concierto IV (24 de la sociedad), Miércoles 16 de Enero de 1924.

Precede al tít.: Sociead Filarmónica de Pontevedra, año IV, 1923-1924Precede ó tít.: Sociead Filarmónica de Pontevedra, año IV, 1923-192

Untersuchungen zum Aufbau und zur Klassifikation von elliptischen Galaxien. Beobachtung und Theorie kosmischer Roentgenquellen Schlussbericht

SIGLEAvailable from TIB Hannover: DtF QN1(39,25) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Leistungsfaehigkeit biologisch schnell abbaubarer Schmierstoffe in Zahnradgetrieben Abschlussbericht

Available from TIB Hannover: RA 2383(237)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEArbeitsgemeinschaft Industrieller Forschungsvereinigungen e.V., Koeln (Germany)DEGerman