Signal processing method, transmitter, receiver and signal processing system

Disclosed are a signal processing method, a transmitter, a receiver and a signal processing system. The method comprises: determining a structure of a first-class subframe, wherein the first-class subframe characterizes that a transmission length on an auxiliary carrier is less than some subframes of a subframe, and the structure of the first-class subframe comprises some symbols with the length less than or equal to the length of an orthogonal frequency division multiplexing (OFDM) symbol and N OFDM symbols contained in the first-class subframe, N being an integer greater than or equal to zero; according to the structure of the first-class subframe, determining a synchronization signal and/or a control signal; and via the first-class subframe, sending the synchronization signal and/or the control signal to a receiver.