Dual-mode system, frequency spectrum scheduling baseband unit and interference elimination method

The invention discloses a GSM (global system for mobile communications) and UMTS (universal mobile telecommunications system) dual-mode system which comprises a GSM and LTE (long term evolution) control unit, a GSM and UMTS baseband unit, a GSM and UMTS middle radio frequency unit, a duplexer and an antenna, wherein the GSM and LTE control unit is used for generating control information of a GSM and an LTE; the GSM and UMTS baseband unit is used for generating and receiving baseband signals for processing the GSM and the UMTS according to the control information of the GSM and the UMTS, and scheduling frequency spectrum resources of the GSM and the UMTS; the GSM and UMTS middle radio frequency unit is used for converting the baseband signals of the GSM and the UMTS into downlink radio frequency signals; the duplexer is used for carrying out filtering and combination processing on uplink and downlink radio frequency signals of the GSM and the UMTS; and the antenna is used for converting the downlink radio frequency signals subjected to filtering into electromagnetic waves and then emitting the electromagnetic waves. According to the scheme in the invention, an emitting end can carry out dynamic scheduling on the frequency spectrum resources of the GSM and the UMTS, thereby improving the utilization ratio of available frequency spectrum resources; meanwhile, a receiving end minimizes the interference between the GSM and the UMTS by using an interference elimination method.