Realization of Direct Digital Synthesis in Cordic Algorithm

Abstract

Nowadays the modern communication system and software defined radio-based applications needs Trans receiver consisting of fully programmable circuit which performs modulation and demodulation process. The method which does not need memory for realizing modulators and demodulators is CORDIC algorithm. The CORDIC algorithm is a versatile algorithm which calculates only adder and shifter operations instead of using multiplier. So, this algorithm is mostly used for VLSI and digital signal processing. The main concept used in this project is Direct Digital Synthesis (DDS) which generates the analog waveform in digital format based on CORDIC algorithm approach .This paper focuses on analysis and simulation of Binary phase shift keying (BPSK), Binary amplitude shift keying (BASK), Binary frequency shift keying (BFSK), Quadrature phase shift keying (QPSK) modulation scheme using DDS based on CORDIC algorithm instead of ROM look up table which greatly reduce the number of slices and no of look up tables. The whole simulation is done on Modelsim and Xilinx-ISE using Verilog descriptive language and these modulation schemes are implemented on Spartan-3 FPGA kit.