摘要 : A power and spectrally efficient slow frequency hopping FQPSK(SFH-FQPSK) is proposed for future personal communications systems(PCS). The authors apply the constant envelope FQPSK modem/radioarchitecture (filtered QPSK (Feher, 198... 展开 A power and spectrally efficient slow frequency hopping FQPSK(SFH-FQPSK) is proposed for future personal communications systems(PCS). The authors apply the constant envelope FQPSK modem/radioarchitecture (filtered QPSK (Feher, 1982)) to a slow frequency hoppingsystem to achieve higher spectrum efficiency as well as higher powerefficiency. Being a constant envelope system, SFH-FQPSK can operate withclass C power amplifier without output backoff (OBO). Therefore, it is4-7 dB more power efficient than T/4-QPSK which is currently adopted asthe US digital cellular and Japanese handyphone PCS standards. Ascompared to the European DECT and GSM standard GMSK, the proposedSFH-FQPSK is about 50% more spectrally efficient. The BER performance ofthis system, employing convolutional coding and Viterbi decoding forFEC, is evaluated in a Rayleigh fading/AWGN environment. Results showthat the BER performance of the authors hard-limited SFH/FQPSK is asgood as that of linear SFH coherent QPSK (SFH-CQPSK), and is 3 and 5 dBbetter than ideal coherent QPSK and differentially encoded coherent QPSK(DEQPSK) systems, respectively. With the higher spectral and powerefficiency and superior BER performance, the authors conclude that theproposed SFH-FQPSK is an excellent candidate for the futurehigh-capacity PCS networks 收起