Patent ID: 8891642

Claim:
A method, comprising: for at least a first antenna of a wireless communication: generating a legacy preamble portion for a frame in accordance with a legacy standard wireless communication protocol for transmission by the at least first antenna, 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 includes information interpretable by legacy devices to determine a duration for not transmitting to avoid a collision with the frame; and generating a first current protocol preamble portion for the frame in accordance with a current standard wireless communication protocol of the MIMO wireless communication; and for at least a second antenna of the wireless communication: generating a cyclically shifted legacy preamble portion for the frame for transmission by the second antenna, 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 current standard wireless communication protocol of the MIMO wireless communication.