Patent ID: 7535951

Claim:
A code division multiplexing communication system which contains transceiver having: a first data generator which generates a first channel signal array having signal values VL and VH (VL<VH, VL≠0, VH≠0, 2×VL≠VH); a data distributor which branches the first channel signal array into a first branch signal array and a second branch signal array which are synchronous with each other; a first spread modulator which performs spread modulation on the first branch signal array in use of a first spread code; a second spread modulator which converts the second branch signal array to a signal array having signal values VL, VH and high impedance, and performs spread modulation on the modulated signal array in use of the first spread code; and an adder which superimposes the modulated signal arrays output from the first and the second spread modulator to generate a code division multiplexed quaternary signal array.