Title :
Quadrature frequency/phase modulation
Author :
Fleisher, S. ; Shouxing Qu
Author_Institution :
Dept. of Electr. Eng., Tech. Univ. of Nova Scotia, Halifax, NS, Canada
Abstract :
A digital modulation method based on quadrature-carrier multiplexing of two N-dimensional biorthogonal signal sets is proposed. An embodiment of the proposed method referred to as quadrature frequency/phase modulation (QFPM), and its continuous phase modification CP QFPM, are described. QFPM results when two NFSK/2PSK (combined frequency and phase shift keying) signals are quadrature-carrier multiplexed. The power efficiency of QFPM and CP QFPM on the AWGN (additive white Gaussian noise) channel is always superior when compared to that of quadrature-amplitude modulation (QAM), and their bandwidth efficiency is demonstrated to be under certain conditions comparable or better than that of QAM. Both schemes possess a self-synchronization capability. The demonstrated performance characteristics of QFPM and CP QFPM suggest that they may be competitive with respect to QAM on channels where little or no filtering is desired.<>
Keywords :
Gaussian channels; frequency shift keying; multiplexing; quadrature amplitude modulation; quadrature phase shift keying; synchronisation; AWGN channel; NFSK/2PSK; QAM; additive white Gaussian noise channel; bandwidth efficiency; biorthogonal signal sets; continuous phase QFPM; filtering; frequency shift keying; performance characteristics; phase shift keying; power efficiency; quadrature frequency/phase modulation; quadrature-amplitude modulation; quadrature-carrier multiplexing; self-synchronization; AWGN; Additive white noise; Bandwidth; Digital modulation; Filtering; Frequency shift keying; Phase modulation; Phase shift keying; Quadrature amplitude modulation;
Journal_Title :
Communications, IEEE Transactions on
