Patent ID: 8031806

Claim:
A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication, the method comprises: for a first transmit antenna of the MIMO communication: generating a legacy preamble portion for the frame in accordance with a legacy standard wireless communication protocol, wherein the legacy preamble portion includes at least a first training sequence and a second training sequence and a signal field, wherein the signal field is generated in accordance with the legacy wireless communication protocol and includes information to determine a duration that legacy devices compliant with the legacy standard wireless communication protocol will not transmit; and generating a current protocol preamble portion for the frame in accordance with a second current standard wireless communication protocol of the MIMO wireless communication; and for at least a second antenna of the MIMO communication: generating a cyclically shifted legacy preamble portion for the frame, wherein the cyclically shifted legacy preamble portion includes a cyclically shifted first training sequence, a cyclically shifted second training sequence and a cyclically shifted signal field, wherein the cyclically shifted legacy preamble portion is time-shifted with respect to the legacy preamble portion; and generating a second current protocol preamble portion for the frame in accordance with the second current standard wireless communication protocol of the MIMO wireless communication.