A Review of Cordic Algorithm in DDS Based Communication Systems

Direct digital synthesis (DDS) is a method to generate waveforms directly in the digital domain. In this method,the target waveforms are the sine and cosine ones. The Co-ordinate Rotational Digital Computer (CORDIC) algorithm configured in Rotation Mode (RM) can behave as a quadrature phase-to-amplitude converter that directly generates sine and cosine waveforms. The main advantage of using CORDIC-based DDS with respect to Look Up Table (LUT) based methods is that it can achieve both high phase resolution and high precision with lower hardware cost. CORDIC algorithm is a unique technique for performing various complex arithmetic functions using shift-add iterations. This paper reviews the use CORDIC architectures and types along with Direct Digital Synthesis to implement both analog and digital modulation techniques that can be found in a software defined radios i.e. reconfigurable digital radios. Also this system found in many modern devices, including radio receivers, mobile telephones, radiotelephones, walkie-talkies, satellite receivers, GPS systems, etc.