Authors
1 Control & System Engineering Dept, University of Technology, Baghdad, Iraq.
2 Control & System engineering department, University of Technology, Baghdad, Iraq.
Abstract
with the introduction of new standards at a fast pace, wireless communication
is experiencing great development and growth, thereby raising the level of demand for
radio spectrum. The spectrum, however, is a limited resource and cannot be subdivided
indefinitely to satisfy any use. As a result, spectrum scarcity arises. This scarcity
represents the main problem that faces the future of wireless networks. This scarcity is
due to the inefficient fixed spectrum allocation technique. The Dynamic Spectrum Access
(DSA) is a successful solution to reduce the spectrum scarcity that wireless
communications currently face. DSA allows users without a spectrum license known as
Secondary Users (SUs) to temporarily use the unused licensed spectrum. This work
focuses on analysis, and design of the Cognitive Radio (CR) system forOrthogonal
Frequency Division Multiplexing modulation. The OFDM transceiver system has been
implemented 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 energy
detection of the OFDM transceiver. This system was analyzed under the Adaptive White
Gaussian Noise (AWGN) channel based XSG. In this work, the energy detector is also
designed using the XSG ISE14.1 Simulink and obtained all the signals successfully.
Keywords
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