Signal transmitting method, device and communication system

A signal transmitting method, device and communication system are provided by the embodiments of the present invention. The signal transmitting method includes: a transmitting end forms a superimposing symbol by superimposing symbols transmitted to multiple user equipment; a phase rotation of the superimposing symbol is performed to form a rotation symbol; the superimposing symbol is sent by using a first antenna, and the rotation symbol is sent by using a second antenna. With the embodiments of the present invention, channel conditions of multiple user equipments can be differentiated, and the gain of the NOMA in a micro cell can be sufficiently exerted.