The invention discloses a method for transmitting data based on
Orthogonal Frequency Division Multiplexing (OFDM), which is applied to transmission of uplink data of middle-distance and short-distance
wireless communication systems and is characterized in that: available
frequency band of the
system is equally divided into N basic sub-frequency bands in advance, wherein the method comprises the following steps: a transmitting site transmits data to a receiving site by a single sub-
frequency band or M combined sub-frequency bands, wherein M is equal to 2*n; the transmitting site employs a sampling rate of fs or M*fs of a
baseband sample; the receiving site receives data sent from one or a plurality of transmitting sites in the available
frequency band; and the receiving site employs a sampling rate of N*fs of the
baseband sample. The invention further provides a
system for transmitting data based on the OFDM. The method and the
system are based on the OFDM technology and
combined use of the sub-frequency bands; according to the method and the system, the transmitting site and the receiving site in the
wireless communication system are permitted to have different bandwidth configurations, the transmitting site can utilize lower configuration while the receiving site can utilize higher configuration, thereby improving the efficiency, the spectrum efficiency, the
throughput rate, etc.; in addition, a plurality of user sites communicating with an access point simultaneously can be realized.