A device, wherein the device supports a carrier sense multiple access technology, and the device comprises: a determining unit, configured to determine that N second receiving devices communicate with a second sending device by using a radio resource, wherein N is a positive integer greater than or equal to 1; an obtaining unit, configured to obtain a receive effective channel vector from each second receiving device to the device, and a network allocation vector NAV duration for which each second receiving device occupies the radio resource; wherein the obtaining unit is further configured to obtain a transmit antenna spatial correlation matrix of the device; characterized in that: the determining unit is further configured to determine M transmit vectors, wherein the M transmit vectors meet a first preset condition and a second preset condition, the first preset condition is: a channel statistical measurement value that is determined according to the M transmit vectors determined by the determining unit and the transmit antenna spatial correlation matrix obtained by the obtaining unit is less than a first preset value, and the second preset condition is: all N interference measurement values that are determined according to the M transmit vectors determined by the determining unit and N receive effective channel vectors obtained by the obtaining unit are less than a second preset value, wherein M is a positive integer greater than or equal to 1; and a communication unit, configured to separately communicate with K first receiving devices within a specified time by using K of the M transmit vectors determined by the determining unit and the radio resource, wherein K is a positive integer less than or equal to M, and the specified time is an end time of the longest one of N NAV durations. a determining unit, configured to determine that N second receiving devices communicate with a second sending device by using a radio resource, wherein N is a positive integer greater than or equal to 1; an obtaining unit, configured to obtain a receive effective channel vector from each second receiving device to the device, and a network allocation vector NAV duration for which each second receiving device occupies the radio resource; wherein the obtaining unit is further configured to obtain a transmit antenna spatial correlation matrix of the device; characterized in that: the determining unit is further configured to determine M transmit vectors, wherein the M transmit vectors meet a first preset condition and a second preset condition, the first preset condition is: a channel statistical measurement value that is determined according to the M transmit vectors determined by the determining unit and the transmit antenna spatial correlation matrix obtained by the obtaining unit is less than a first preset value, and the second preset condition is: all N interference measurement values that are determined according to the M transmit vectors determined by the determining unit and N receive effective channel vectors obtained by the obtaining unit are less than a second preset value, wherein M is a positive integer greater than or equal to 1; and a communication unit, configured to separately communicate with K first receiving devices within a specified time by using K of the M transmit vectors determined by the determining unit and the radio resource, wherein K is a positive integer less than or equal to M, and the specified time is an end time of the longest one of N NAV durations. the determining unit is further configured to determine M transmit vectors, wherein the M transmit vectors meet a first preset condition and a second preset condition, the first preset condition is: a channel statistical measurement value that is determined according to the M transmit vectors determined by the determining unit and the transmit antenna spatial correlation matrix obtained by the obtaining unit is less than a first preset value, and the second preset condition is: all N interference measurement values that are determined according to the M transmit vectors determined by the determining unit and N receive effective channel vectors obtained by the obtaining unit are less than a second preset value, wherein M is a positive integer greater than or equal to 1; and a communication unit, configured to separately communicate with K first receiving devices within a specified time by using K of the M transmit vectors determined by the determining unit and the radio resource, wherein K is a positive integer less than or equal to M, and the specified time is an end time of the longest one of N NAV durations.