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FPGA Implementation of Digital Modulation Schemes

S.Rajaram , R.Gayathre

Software Defined Radio (SDR) has been one of the new techniques developed to change the way the traditional wireless communication system work. This paper deals with the Field-programmable gate-array (FPGA) implementation of Digital Modulator such as Quadrature amplitude modulation (QAM), Binary amplitude-shift keying (BASK), Binary frequency shift keying (BFSK) and Binary phase-shift keying (BPSK). Since digital modulation is more secure and more efficient in long-distance transmission and noise detection and correction than its analog counterpart, it has an important place in modern communications. They employ the minimum number of blocks necessary for achieving the modulation. The input carrier signal and message signal are generated using CO-ordinate Rotation Digital Computer (CORDIC) algorithm. These digital modulators were developed and compiled to a Very high speed integrated circuit Hardware Description Language (VHDL) net list, and were later implemented individually into Spartan 3 FPGA board.