Title :
A novel QPSK demodulation LSI (ACT-Demod) for digital mobile radio
Author :
Saito, Shigeki ; Takami, Tadao
Author_Institution :
NTT Radio Commun. Syst. Lab., Yokosuka, Japan
Abstract :
A novel type of π/4-shifted QPSK (quadrature phase-shift keying) demodulation LSI employing adaptive carrier tracking (ACT) for digital TDMA (time-division multiple-access) mobile communication systems has been successfully developed. ACT provides fast carrier tracking and thus yields good bit-error-rate performance under a fast Rayleigh fading environment. This ACT demodulation (ACT-Demod) LSI, which is implemented entirely by digital circuits, includes two branch QPSK detectors for postdetection selection diversity, a bit timing recovery circuit, and an AFC (automatic frequency control) circuit. ACT-Demod LSI achieves a transmission performance better than that of conventional noncoherent differential detection while consuming less than 9 mW of power
Keywords :
CMOS integrated circuits; adaptive systems; demodulators; digital radio systems; mobile radio systems; phase shift keying; time division multiple access; tracking; π/4-shifted QPSK; ACT demodulation; ACT-Demod LSI; AFC; CMOS IC; QPSK demodulation LSI; TDMA; adaptive carrier tracking; automatic frequency control; bit timing recovery circuit; bit-error-rate; branch QPSK detectors; digital circuits; digital mobile radio; fast Rayleigh fading; fast carrier tracking; postdetection selection diversity; quadrature phase-shift keying; time-division multiple-access; transmission performance; Automatic frequency control; Circuits; Demodulation; Land mobile radio; Large scale integration; Mobile communication; Phase shift keying; Quadrature phase shift keying; Rayleigh channels; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-87942-582-2
DOI :
10.1109/VETEC.1991.140574
