Receiving-transmission apparatus and method of switching transmission antenna in transmission switched diversity system

A receiving apparatus, comprising:

• a channel estimation unit to estimate a Link Quality Indication (LQI) by using a data frame received from a transmission apparatus;
• a switching determination unit to determine a switching of a transmission antenna when the LQI is lower than a predetermined threshold value;
• an announcement command frame generation unit to set a TSD IE to request a switching of a transmission antenna when the switching of the transmission antenna is determined, and to generate an announcement command frame including the TSD IE to transmit the generated announcement command frame to the transmission apparatus;
• and
• an announcement command frame reading unit to verify the transmission antenna switched in a converted TSD IE when receiving a response announcement command frame including the converted TSD IE from the transmission apparatus.

A method of switching a transmission antenna in a transmission apparatus, the method comprising:

• receiving an announcement command frame from a receiving apparatus;
• verifying a TSD IE included in the received announcement command frame to verify whether to request a switching of the transmission antenna;
• selecting an antenna, not being selected from among a plurality of antennas, as a transmission antenna when the received announcement command frame requests the switching of the transmission antenna;
• converting transmission antenna information included in the TSD IE into the selected transmission antenna;
• generating a response announcement command frame including the converted TSD IE, and transmitting the generated response announcement command frame to the receiving apparatus;
• and
• switching a currently used antenna into the selected transmission antenna.

A method of switching a transmission antenna of a transmission apparatus in a receiving apparatus, the method comprising:

• estimating an LQI using a data frame received from the transmission apparatus;
• determining a switching of the transmission antenna when the LQI is lower than a predetermined value;
• setting a TSD IE to request a switching of a transmission antenna when the switching of the transmission antenna is determined;
• generating an announcement command frame including the TSD IE to transmit the generated announcement command frame to the transmission apparatus;
• receiving a response announcement command frame including a converted TSD IE from the transmission apparatus;
• and
• verifying the transmission antenna switched in the converted TSD IE.