An antenna system, comprising: a first antenna subsystem, comprising a first antenna and a first remote radio unit, RRU, wherein the first antenna is connected to the first RRU by using a feeder; a second antenna subsystem, comprising a second antenna and a second RRU, wherein the second antenna is connected to the second RRU by using a feeder, a vertical beam width of the second antenna is greater than a vertical beam width of the first antenna, a downtilt angle of the second antenna is greater than a downtilt angle of the first antenna, and the second antenna and the first antenna transmit and/or receive signals by using a carrier of same frequency, wherein the first antenna is configured for wide area coverage, and the second antenna is configured for signal enhancement in a near-end area of a base station; and a baseband processing pool, separately connected to the first RRU and the second RRU by using cables, and configured to determine, according to quality of a channel between the first antenna and a terminal and quality of a channel between the second antenna and the terminal, to use the first antenna and/or the second antenna to transmit a signal to the terminal and/or receive a signal transmitted by the terminal; wherein the baseband processing pool is further configured to determine the quality of the channel between the first antenna and the terminal according to channel quality measurement information of the first antenna transmitted by the terminal, and determine the quality of the channel between the second antenna and the terminal according to channel quality measurement information of the second antenna transmitted by the terminal. a first antenna subsystem, comprising a first antenna and a first remote radio unit, RRU, wherein the first antenna is connected to the first RRU by using a feeder; a second antenna subsystem, comprising a second antenna and a second RRU, wherein the second antenna is connected to the second RRU by using a feeder, a vertical beam width of the second antenna is greater than a vertical beam width of the first antenna, a downtilt angle of the second antenna is greater than a downtilt angle of the first antenna, and the second antenna and the first antenna transmit and/or receive signals by using a carrier of same frequency, wherein the first antenna is configured for wide area coverage, and the second antenna is configured for signal enhancement in a near-end area of a base station; and a baseband processing pool, separately connected to the first RRU and the second RRU by using cables, and configured to determine, according to quality of a channel between the first antenna and a terminal and quality of a channel between the second antenna and the terminal, to use the first antenna and/or the second antenna to transmit a signal to the terminal and/or receive a signal transmitted by the terminal; wherein the baseband processing pool is further configured to determine the quality of the channel between the first antenna and the terminal according to channel quality measurement information of the first antenna transmitted by the terminal, and determine the quality of the channel between the second antenna and the terminal according to channel quality measurement information of the second antenna transmitted by the terminal.