Title :
Extracting in-phase and quadrature signal components from a bandlimited real signal using a closed form optimal (MSE) halfband multirate filter design and its implementation on the Motorola DSP56001/DSP56ADC16
Author :
West, Philip D. ; Austin, Mark D.
Author_Institution :
Concepts Anal. Lab., Georgia Tech. Res. Inst., Atlanta, GA, USA
Abstract :
Extraction of the in-phase (I) and quadrature (Q) components from an RF signal is an important problem in radar and communication systems. In analog systems, the image spur suppression is a function of the phase and amplitude balance between the mixers and splitters in the two channel of the I/Q demodulation network. In the proposed system, an all digital scheme is described that allows arbitrary image spur rejection to be achieved by increasing the filter coder. An MMSE optimal FIR halfband filter is proposed and results are presented from a real-time implementation on the Motorola DSP56001 digital signal processor and the DSP56ADC16 delta-sigma A/D converter
Keywords :
analogue-digital conversion; demodulation; digital filters; digital signal processing chips; filtering and prediction theory; signal processing; DSP56ADC16 delta-sigma A/D converter; I/Q demodulation network; MMSE optimal FIR halfband filter; Motorola DSP56001 digital signal processor; RF signal; amplitude; analog systems; bandlimited real signal; communication systems; digital scheme; filter coder; image spur rejection; image spur suppression; inphase signal components extraction; mixers; phase; quadrature signal components extraction; radar systems; splitters; Band pass filters; Demodulation; Digital filters; Filtering; Finite impulse response filter; Laboratories; RF signals; Sampling methods; Signal analysis; Signal design;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-0532-9
DOI :
10.1109/ICASSP.1992.226305
