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Cognitive Radio (CR) technology constitutes a new paradigm where wireless devices can access the spectrum left unused by licensed or primary users in an opportunistic way. At the same time, these unlicensed secondary users (SUs) must reliably detect the presence of licensed primary transmission to avoid interfering with them. Information about primary users (PUs) locations are very important in Cognitive...
Fuzzy logic has long been used for control system, but not much effort has been put to use it for data smoothing. In this paper it has been attempted to find the average of a set of data by applying Fuzzy logic. Generation of membership function is crucial in such application. So this issue has been discussed in detail. This method has been applied on some arbitrarily generated test data for establishing...
National Physical Laboratory, New Delhi, India (NPLI) has started a new time service by transmitting digital time data via telephone network in name of Teleclock service which is quite different from the usual dial-up time service. Data for the time of the day are sent five times for the sake of redundancy. The phase information related to the second pulse is also disseminated, thus providing the...
On the Indian subcontinent, scintillations are quite frequent and intense and have a longer duration during a peak period of an 11-year solar cycle. This phenomenon quite significantly informs us about the performance of the Global Positioning System (GPS). A special experiment has particularly been conducted to study the effect of scintillations on GPS time. This paper discusses the findings of this...
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