| 摘要 |
A signal processing method, particularly in a MIMO wireless communications system, is capable of receiving a DATA frame and responding with transmission of an ACK frame, the ACK frame being of conventional structure in that it contains a reserved portion and an active portion, the ACK frame further containing, in the reserved portion, information defining a transmission mode selection message for interpretation by suitably configured communications apparatus. In such apparatus, the message is interpreted as an indication of the transmission mode, of a plurality available, to be used in future transmissions of frames of information.
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