Title :
A novel modulation/RF architecture for long battery life-time PCS mobile units
Author_Institution :
Dept. of Electr. & Comput. Eng., Missouri Univ., Kansas City, MO, USA
fDate :
8/1/1997 12:00:00 AM
Abstract :
A novel modulation/RF architecture is proposed for digital cellular and PCS applications to improve the system power efficiency. By introducing controlled cross-correlation to the I and Q channels in an offset QPSK system and employing modified baseband filtering techniques, the proposed modulation architecture provides a constant envelope modulated signal and improves the power efficiency by 4-7 dB as compared to conventional QPSK. By implementing this new system architecture in a cellular phone, portable computer, or other PCS mobile units, the battery life time could be significantly improved
Keywords :
cellular radio; filtering theory; land mobile radio; personal communication networks; portable computers; quadrature phase shift keying; I channel; PCS applications; PCS mobile units; Q channel; cellular phone; constant envelope modulated signal; cross-correlation; digital cellular applications; hardware experiments; long battery life-time; modified baseband filtering; modulation/RF architecture; offset QPSK system; performance evaluation; portable computer; system power efficiency; Baseband; Batteries; Cellular phones; Computer architecture; Control systems; Digital modulation; Filtering; Personal communication networks; Quadrature phase shift keying; Radio frequency;
Journal_Title :
Consumer Electronics, IEEE Transactions on
