H - Electricity – 03 – C
Patent
H - Electricity
03
C
H03C 3/02 (2006.01) H03D 3/00 (2006.01)
Patent
CA 2041279
Quadrature Biorthogonal Modulation Abstract Digital modulation/demodulation methods utilize multiplexing in quadrature of two N-dimensional biorthogonal signal sets wherein the said signal sets are transmitted on each of the two quadrature carriers cos.omega.ct and sin.omega.ct in order to increase the bandwidth efficiency and/or the power efficiency as compared to known digital transmission methods. One embodiment of the invention utilizes two sets of combined frequency/phase modulated (FPM) signals of the type NFSK/2PSK with adjacent frequencies separation of 1/T Hz as the constituent biorthogonal signal sets, and is referred to as Quadrature Frequency/Phase Modulation (QFPM). A preferred embodiment of the invention referred to as Continuous Phase Quadrature Frequency/Phase Modulation (CP QFPM) is essentially a modified QFPM scheme with sinusoidal shaping and an offset of T/2 in the relative alignment of the baseband modulating waveforms for the two quadrature components of the QFPM signal set. Another preferred embodiment of the invention, referred to as Continuous Phase Frequency/Phase Modulation (CP FPM), is a particular case of CP QFPM wherein the same frequencies are used in both quadrature components of CP QFPM which yields a constant- envelope signal set.
Fleisher Solomon M.
Qu Shouxing
Fleisher Solomon M.
Qu Shouxing
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