Grid Services for Measurements on Digital Wireless Communications Systems
Napolitano, Aniello (2009) Grid Services for Measurements on Digital Wireless Communications Systems. [Tesi di dottorato] (Inedito)
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The research activity accounted for in this Ph.D thesis belongs to the general field of electrical and electronic measurement. The attention is focused on the implementation of GRID services for performance assessing of digital wireless communication systems. The original contribution consists in the development of two original measurement methods, the former allows measuring the modulation quality of systems compliant with IEEE 802.16d-2004 standard by means of any hardware characterized by a enough sample rate and input band width, and the latter carries out reliability and efficiently the in-service measurements also in presence of in-channel interferences. The high computational burden experienced during the wide experimental phase by proposed methods has encouraged their implementation according to GRID Service paradigm. Respect to the classic Web Service, GRID Service provides the possibility of both sharing the proposed methods among researches and technicians who work on the same topics, and processing some proposed methods stages in parallel way on several calculus nodes, thus reducing the whole processing time. Differently from the normal GRID Service, the developed GRID Services involve the measurement instrumentation, such digital acquisition systems and waveform generator, other than the calculus nodes. Suitable strategies for discovering, accessing, setting the measurement instruments have to be provided for. To this aim, new GRID architecture has been proposed, which virtualizes the measurement instruments into new components, namely instrumentation devices, and makes use of classic mechanisms already presented in GRID architecture, such as PBS scheduler, for dealing with the instruments discovery issue. To take advantage from the proposed GRID Services, a proper web portal is also implemented. An intense experimental phase is executed for assessing the methods and GRID Services performance by applying emulated and real communication signals. Measurement results are analyzed and compared to those achievable through the application of existing methods and/or instrument available on the market. Particular attention is also made to the processing time measurement of GRID Service with respect to a sequential implementation, in order to evidence the gains provided by a parallel implementation.
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