carried with u2212 sin u03c9t the second multiplier is configured to multiply the imaginary part of the signals to be carried with cos u03c9t and the second accumulator is configured to perform accumulation of results of the third and fourth multipliers the specific schematic diagram is similar to fig1 and an accompanying drawing will not be repeated here the disclosure further provides a system for complex carrier modulation demodulation when the modulation terminal of the system is a device for complex carrier modulation the demodulation terminal of the system may be a device for complex carrier modulation or real carrier modulation when the modulation terminal of the system is a device for real carrier modulation the demodulation terminal of the system may be a device for complex carrier modulation or real carrier modulation the first embodiment of a system for complex carrier modulation demodulation includes a device for complex carrier modulation and a device for complex carrier demodulation wherein the device for complex carrier modulation is configured to modulate signals to be carried using complex signals as carrier signals to obtain complex carrier modulation signals the complex carrier signals are e u2212 i u03c9t or e i u03c9t the device for complex carrier demodulation is configured to demodulate modulated signals using complex signals as carrier signals to obtain complex carrier demodulation signals the complex carrier signals are e u2212 i u03c9t or e i u03c9t the second embodiment of.