Method for tracking channel in wireless AV system and wireless device using same

A method of performing channel tracking in a wireless audio and video (AV) system, the method comprising:

• receiving, by a first wireless device, a radio signal including a first part associated with a preamble and a second part associated with a data block and a guard interval (GI) from a second wireless device;
• estimating, by the first wireless device, an initial channel, based on the preamble;
• estimating, by the first wireless device, a residual channel, based on the GI;
• applying a reconstruction sequence reconstructed based on a Golay sequence having a predetermined length to the GI;
• and
• updating, by the first wireless device, a channel, based on first information obtained based on the estimation of the initial channel and second information obtained based on the estimation of the residual channel,
• wherein, when the number of channels used for channel bonding in the wireless AV system is ‘2’, a Golay sequence having a length of 64 is applied to the GI if the GI is a short GI,
• wherein, when the number of channels used for channel bonding in the wireless AV system is ‘2’ and when the short GI is applied to the GI, a structure of the Golay sequence for the short GI is defined as [−Gf16 Ge16−Gf16],
• wherein, when a first sequence −Gf16 among the short GI corresponds to 1st to 16th elements, the 9th to 16th elements are defined as w0,
• wherein, when a second sequence −Ge16 among the short GI corresponds to 17th to 32nd elements, the 17th to 32nd elements are defined as w1,
• wherein, when a third sequence −Gf16 among the short GI corresponds to 33rd to 48th elements, the 33rd to 40th elements are defined as w2, and
• wherein a fourth sequence −Ge16 among the short GI corresponds to 49th to 64th elements,
• wherein the w0, w1 and w2 depend on a space-time stream number or a transmit chain number used to define the Ge16 and the Gf16,
• wherein the Ge16 and the Gf16 are a Golay pair which is a pair of complementary sequences,
• wherein the w0, w1 and w2 are defined as [−1, −1, −1, −1] when the space-time stream number or the transmit chain number is 1, and the w0, w1 and w2 are defined as [1, −1, −1, −1] when the space-time stream number or the transmit chain number is 2,
• wherein the reconstructed sequence includes a first sequence corresponding to the w1 and a second sequence corresponding to the w2 and the w0,
• wherein a first Golay sequence is output based on the first sequence,
• wherein a second Golay sequence is output based on the second sequence, and
• wherein the second information is obtained based on a sum of the first and second Golay sequence and a sign.