Patent ID: 8385440

Claim:
An apparatus comprising: a signal generator to output one of a first sequence or a second sequence and to augment sequences with cover codes, wherein a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; a physical layer preamble controller to control the signal generator to generate a preamble of a data unit, including: a short training field (STF) formatter to cause the signal generator to generate an STF for use in at least frame synchronization; and a long training field (LTF) formatter to cause the signal generator to generate an LTF for use in at least channel estimation; wherein the STF formatter controls the signal generator to include the first sequence in a last portion of the STF, and the LTF formatter controls the signal generator to include the second sequence in a beginning portion of the LTF, and wherein the second sequence in the beginning portion of the LTF immediately follows the first sequence in the last portion of the STF.