Abstract
The invention provides a base station supporting downlink non-orthogonal multiple access based on dot matrix division and a modulation method. The modulation method comprises the steps of: modulating at least one most significant bit of a weak user equipment to have a first transmission power; modulating at least one least significant bit of the weak user equipment to have second transmission power, wherein the second transmission power is smaller than the first transmission power; and modulating at least one second most significant bit of the strong user equipment to have a third transmission power, wherein the third transmission power is between the first transmission power and the second transmission power.