Communication system and method using space division multi-user multiple input multiple output (SD-MIMO) communication method

A terminal in a wireless network, comprising:

• a receiver configured to receive a first channel estimation field and a second channel estimation field from an access point, receive from the access point a control field comprising a common control field and an individual control field, and receive from the access point a data field subsequent to the individual control field,
• wherein the common control field is received subsequent to the first channel estimation field and prior to the second channel estimation field, and the individual control field is received subsequent to the second estimation field, and
• wherein a space time stream (STS) comprises the first and second channel estimation fields, the common control field, the individual control field, and the data field;
• and
• a decoder configured to decode the STS based on the common control field, wherein the common control field comprises information of whether precoding has been applied to the second channel estimation field, to the individual control field, and to the data field of the STS, excluding the first estimation field and the common control field.