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In this paper are presented the results obtained after of evaluating three techniques of blind detection of spectrum holes used in Cognitive Radio (CR). The techniques evaluated correspond to the general technique of detection of energy levels, the method LAD BASED and the technique based on forward methods. The operation of these techniques was tested in simulation scenarios of a telecommunications...
Inefficient use of radio spectrum necessitates the use of cognitive radio technology to exploit the underutilized radio spectrum opportunistically. Spectrum sensing enables cognitive radio user to continuously sense the channel before accessing in order to avoid interference to licensed user and other radio systems. Most of existing research in cognitive radio had been mainly dedicated to the physical...
Cognitive radio technique enables unlicensed users to use the spectrum assigned to licensed users. Therefore, a highly accurate sensing technique to know the presence of licensed users is essential. For such a purpose, soft decision cooperative spectrum sensing techniques are proposed. In a soft decision cooperative spectrum sensing, the cognitive base station collects the received signal energy information...
Spectrum sensing is a critical component of the Cognitive Radio that detects the presence of primary user signal in a channel. In this paper energy detection technique based on Neyman-pearson criterion is used to detect the presence of deterministic primary user (PU) signals in the channel. We have considered three different kinds of modulated signal such as BPSK, QPSK , DVB-T (2K mode) under additive...
In this paper, the performance analysis of an energy detector is exploited under the η - μ fading channel model. The received unknown signal at the energy detector is considered as the primary signal transmitted by a primary network user (e.g. cognitive radio network). This research is focused on derivation of the closed-form average detection probability over the η - μ fading channel model. Further,...
This paper describes a transceiver design based on clustered ternary code sequences as a form of modulation in order to achieve good interference suppression with a low cost and low complexity implementation. The use of ternary code sequences allows for flexible receiver designs, so that the same transmitted signals can be detected by coherent, differential and non-coherent receivers. By applying...
An energy detector is proposed for code acquisition of chip-interleaved direct sequence spread spectrum systems. Analyses show that the proposed energy detector achieves the same performance as traditional energy detector does for conventional DS/SS systems.
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