Design and Implementation of Multilevel QAM Band pass Modems (8QAM, 16QAM, 32QAM and 64QAM) for WIMAX System Based on SDR Using FPGA
Hadi T. Ziboon1, Muhannad Y. Muhsin2
1Dr. Hadi T. Ziboon, M.Sc. degree in electronic and communication engineering from college of engineering – University of Baghdad, Iraq.
2Muhannad Y. Muhsin, received the B.Sc. degree in electronic engineering from University of Technology, Baghdad, Iraq.

Manuscript received on March 01, 2014. | Revised Manuscript received on March 04, 2014. | Manuscript published on March 05, 2014. | PP: 107-116 | Volume-4 Issue-1, March 2014. | Retrieval Number: A2104034114/2014©BEIESP
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Abstract: The objective of this paper is to simulate, design and implementation of a proposed system of multilevel bandpass QAM modems (modulation/demodulation) schemes with selectable technique between them based on Software Defined Radio (SDR) using FPGA for WIMAX system. These modems are 8QAM, 16QAM, 32QAM and 64QAM. MATLAB-Simulink tool and M-files are used to design these modems.“Simulink HDL Coder” is used to convert all files to VHDL Codes for hardware implementation using FPGA Altera-Cyclone II Family DE2 board. Simulink HDL Coder proves the capabilities to generate Hardware Description Language (HDL) code to MATLAB model (Simulink and M-file) for complex units of proposed system. The complex units are converted to simple units compatible with Simulink HDL Coder. The experimental results show that there is coincidence between transmitted and received data with average time delay of (0.35-0.40µsec) for different data rate (1.5-3Mbps).
Keywords: FPGA, SDR, Simulink HDL Coder, VHDL and WIMAX.