Patent ID: 8737189

Claim:
An apparatus, comprising: at least one processor and/or circuit to generate a signal adapted for Greenfield access, wherein: the signal including, for a first spatial stream, a first HT short training field (STF) followed by a first single HT long training field (LTF) followed by a first signal (SIG) field followed by a first plurality of HT LTFs followed by a first data field; the signal also including, for a second spatial stream, a second STF, a second single HT LTF, a second SIG field, and a second plurality of HT LTFs; and the first STF and the second STF each having a respective 8 micro-sec duration; the single HT LTF and the second HT LTF each having a respective 8 micro-sec duration; the first SIG field and the second SIG field each having a respective 8 micro-sec duration; and the first plurality of HT LTFs being orthonormal having a corresponding plurality of single symbols and having a respective 4 micro-sec duration and the second plurality of HT LTFs being orthonormal having a corresponding plurality of single symbols and having a respective 4 micro-sec duration; and at least one communication interface to transmit the signal to at least one additional apparatus via a plurality of transmit antennas to a device having a plurality of receive antennas; wherein: the second STF being a cyclic diversity delay shifted version of the first STF; the second single HT LTF being a cyclic diversity delay shifted version of the first single HT LTF; the second SIG field being a cyclic diversity delay shifted version of the first SIG field; and at least one of the second plurality of HT LTFs being a cyclic diversity delay shifted version of at least one of the first plurality of HT LTFs.