Areej Munadel Kadhum; Ekhlas Kadum Hamza
Volume 21, Issue 2 , June 2021, , Page 59-69
Abstract
with the introduction of new standards at a fast pace, wireless communicationis experiencing great development and growth, thereby raising the level of demand forradio spectrum. The spectrum, however, is a limited resource and cannot be subdividedindefinitely to satisfy any use. As a result, spectrum ...
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with the introduction of new standards at a fast pace, wireless communicationis experiencing great development and growth, thereby raising the level of demand forradio spectrum. The spectrum, however, is a limited resource and cannot be subdividedindefinitely to satisfy any use. As a result, spectrum scarcity arises. This scarcityrepresents the main problem that faces the future of wireless networks. This scarcity isdue to the inefficient fixed spectrum allocation technique. The Dynamic Spectrum Access(DSA) is a successful solution to reduce the spectrum scarcity that wirelesscommunications currently face. DSA allows users without a spectrum license known asSecondary Users (SUs) to temporarily use the unused licensed spectrum. This workfocuses on analysis, and design of the Cognitive Radio (CR) system forOrthogonalFrequency Division Multiplexing modulation. The OFDM transceiver system has beenimplemented in the first stage using the Quadrature Phase Shift Keying (QPSK)modulation technique by Xilinx System Generator Inter-Symbol InterferenceSimulink(XSG) based on MATLAB. The second stage of the proposed system is to design energydetection of the OFDM transceiver. This system was analyzed under the Adaptive WhiteGaussian Noise (AWGN) channel based XSG. In this work, the energy detector is alsodesigned using the XSG ISE14.1 Simulink and obtained all the signals successfully.
