Certificateless cryptosystems were proposed by Al-Riyami and Paterson in 2003 to solve problems of public key cryptosystems based on PKI and based on identity. Up to now, various types of certificateless cryptographic primitives as encryption functions, signature schemes, key agreement protocols and etc, have been designed. But to the best ...Download Now
In a dense modern electronic warfare environment, IFF/SSR systems receive a wide range of signals from existing radars. Among the most important tasks of such systems are recognition of signals, extraction of work modes for each of the present objectives, separation of received signals, their classification and identification of friend ...Download Now
The ever increasing demand to achieve higher data rates in recent years, have redouned to frequency scarcity. The most important element caused this problem is assigning a specific spectrum band to Primary Users (PU) which they do not use it all time. To solve this problem, J. Mitola III in ...Download Now
In this paper, the authors propose a new channel estimation algorithm based on the training data for Orthogonal Frequency Division Multiplexing (OFDM) system in fast fading channel. In this method, Channel Frequency Response (CFR) is estimated. In the first step, channel response is estimated at pilot subcarriers by last square ...Download Now
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