FPGA implementation of universal modulator using CORDIC algorithm for communication application

The modern communication systems and software radio based applications demands fully digital receivers, consisting of only an antenna and a fully programmable circuit with digital modulators and demodulators. A basic communication system’s transmitter modulates the amplitude, phase or frequency proportional to the signal being transmitted. An efficient solution (that doesn’t require large tables/memory) for realizing universal modulator is CORDIC (CO-ordinate Rotation Digital Computer) algorithm. The CORDIC algorithm is used in the rotation mode, to convert the coordinates from polar mode to rectangular mode. The radius vector(r) and angle (θ) of a CORDIC processor can be programmed to generate the ASK, PSK and FSK signals.Modelsim simulator tool from mentor graphics will be used for functional simulation and verification of the modulator. The Xilinx synthesis Tools (XST) will be used to synthesize the complete modulator on Xilinx Spartan 3E family FPGA (XC3S500E). Xilinx placement & routing tools will be used for backed, design optimization and I/O routing.