A novel QPSK demodulation LSI (ACT-Demod) for digital mobile radio
- 9 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 10903038,p. 652-656
- https://doi.org/10.1109/vetec.1991.140574
Abstract
A novel type of pi /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
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