Patent ID: 8488539

Claim:
A method of generating a preamble sequence for a wireless device, wherein a channel used by a wireless device is divided into four sub-channels including a first sub-channel, a second sub-channel, a third sub-channel and a fourth sub-channel, the method comprising: forming a preamble sequence of a first sub-channel; making a replica of the preamble sequence of the first sub-channel with a phase rotation of a first angle obtained from a memory installed in the wireless device, for forming a preamble sequence of a second sub-channel; making a second replica of the preamble sequence of the first sub-channel with a phase rotation of a second angle obtained from the memory, for forming a preamble sequence of a third sub-channel; making a third replica of the preamble sequence of the first sub-channel with a phase rotation of a third angle obtained from the memory, for forming a preamble sequence of a fourth sub-channel; and arranging the preamble sequences of the first, the second, the third, and the fourth sub-channels to form a preamble sequence of the channel; wherein at least two of the first angle, the second angle, the third angle and an angle of the preamble sequence of the first sub-channel are the same.