A CORDIC-based digital quadrature mixer: comparison with a ROM-based architecture

Author

Nahm, Seunghyeon ; Han, Kyungtae ; Sung, Wonyong

Author_Institution

Sch. of Electr. Eng., Seoul Nat. Univ., South Korea

Volume

4

fYear

1998

fDate

31 May-3 Jun 1998

Firstpage

385

Abstract

This paper describes a CORDIC-based digital quadrature mixer in comparison with a ROM-based architecture. This architecture employs the circular rotation mode of the CORDIC algorithm for signal mixing as well as carrier generation, while the ROM-based architecture requires an additional complex multiplier for signal mixing. To optimize the hardware design parameters, the finite word-length effects of two implementation architectures are analyzed numerically. In addition, the simulation-based word-length determination is also conducted for the application to QPSK and QAM demodulators. The hardware costs of them are estimated, which shows that the CORDIC-based architecture occupies only a third of the area of the ROM-based architecture

Keywords

demodulators; digital arithmetic; mixers (circuits); quadrature amplitude modulation; quadrature phase shift keying; CORDIC algorithm; CORDIC-based architecture; QAM demodulator; QPSK demodulator; ROM-based architecture; carrier generation; circular rotation mode; digital quadrature mixer; finite word-length effects; hardware design; signal mixing; simulation; Amplitude modulation; Baseband; Costs; Demodulation; Frequency; Hardware; Quadrature amplitude modulation; Quadrature phase shift keying; Read only memory; Signal generators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on

Conference_Location

Monterey, CA

Print_ISBN

0-7803-4455-3

Type

conf

DOI

10.1109/ISCAS.1998.698871

Filename

698871