Title :
A digital sinusoid synthesis based on the postscaled CORDIC
Author :
Park, Minkyoung ; Choi, Sungsoo ; Kim, Seunggeun ; Kim, Kiseon ; Lee, Jeong-A
Author_Institution :
Dept. of Inf. & Commun., K-JIST, Kwangju, South Korea
Abstract :
The CORDIC algorithm can be implemented efficiently for digital synthesis of a sinusoidal waveform which is important in modern digital communication field. Since CORDIC rotation is not pure rotation but an expanded rotation, a normalization operation is required to get exact sinusoidal waveforms. In this paper, we implement the postscaled CORDIC sinusoidal generator and compare the performances of two CORDIC-based sinusoidal generators with prescaling scheme and post-scaling scheme. As a result of comparison, the error performance of the postscaled generator is better than that of prescaled generator. Specifically, to get 3 precision bits in the sine function generation, the mean error performance of the postscaled CORDIC digital sinusoidal generator is increased by about 35.24% compared with the prescaled CORDIC digital sinusoidal generator.
Keywords :
digital communication; frequency synthesizers; pipeline arithmetic; scaling circuits; waveform generators; CORDIC algorithm; CORDIC rotation; XILINX FPGA; digital communication; digital frequency synthesizer; digital sinusoid synthesis; error performance; expanded rotation; mean error performance; normalization operation; pipelined CORDIC; post-scaling scheme; postscaled CORDIC digital sinusoidal generator; prescaled CORDIC digital sinusoidal generator; prescaling scheme; sine function generation; Application software; Approximation error; Computer errors; Computer science; Digital arithmetic; Digital communication; Hardware; Navigation; Signal processing; Signal processing algorithms;
Conference_Titel :
Communications, 1999. APCC/OECC '99. Fifth Asia-Pacific Conference on ... and Fourth Optoelectronics and Communications Conference
Conference_Location :
Beijing, China
Print_ISBN :
7-5635-0402-8
DOI :
10.1109/APCC.1999.820420
