Patent ID: 8879472

Claim:
An apparatus comprising: a communication interface configured to support communications with at least one additional apparatus in accordance with a plurality of channel bandwidths; and a processor configured to: extract a long training field (LTF) sequence from a packet; and classify the packet as one of a plurality of packet types based on frequency domain cross-correlation processing of the LTF sequence with each of a plurality of predetermined LTF sequences, wherein: a first of the plurality of predetermined LTF sequences is used for classification of the packet in accordance with a first of the plurality of channel bandwidths; a second of the plurality of predetermined LTF sequences is used for classification of the packet in accordance with a second of the plurality of channel bandwidths; and the LTF sequence or at least one of the plurality of predetermined LTF sequences being [0 0 0 1 −1 1 −1 −1 1 −1 1 1 −1 1 1 1 0 −1 −1 −1 1 −1 −1 −1 1 −1 1 1 1 −1 0 0].