A new FQPSK modem/radio architecture for PCS and mobile communications

A newly developed constant envelope FQPSK modem/radio architecture, which employs a modified double-jump (DJ) filter in the cross-correlated FQPSK system, is proposed for personal communications systems (PCS) and mobile radio applications. The power efficiency and spectrum efficiency of this system are investigated in a non-linear amplified (NLA) environment. The bit error rate (BER) performance is evaluated in a noisy Rayleigh fading channel. We demonstrate that with the simplest threshold detectors (binary robust eye diagrams in I and Q channels), this system is 4-7 dB more power efficient than the US digital cellular standard /spl pi//4-QPSK, 50%-100% more spectrally efficient than the European standard GMSK.