Information sending and receiving methods and apparatuses

An information sending method comprising:

• generating a physical layer protocol data unit (PPDU), wherein the PPDU comprises a target long training sequence, and the target long training sequence is orthogonal to a legacy long training sequence or orthogonal to a high throughput long training sequence;
• and
• sending the PPDU.
• wherein a bandwidth is greater than 20 MHz, and an expression of the target long training sequence is any one of the following:
• Lk=[a1L64,a2L64, . . . akL64];
• L64=[p32,p32];
• L64=[p32,−p32];
• L64=[−p32,p32];
• L64=[−p32,−p32];
• L64=[p32(−16,−1),x1,p32(1,13),−1,1,0,−1,−1,p32(−13,−1),x2,p32(1,15)];
• L64=[p32(−16,−1),x1,p32(1,13),1,−1,0,1,1,p32(−13,−1),x2,p32(1,15)];
• L64=[p32(−16,−1),x1,p32(1,13),1,−1,0,1−1,p32(−13,−1),x2,p32(1,15)];
• L64=[p32(−16,−1),0,p32(1,13),1,1,0,−1,−1,p32(−13,−1),0,p32(1,15)];
• L64=[p32(−16,−1),1,p32(1,13),0,0,0,0,0,p32(−13,−1),1,p32(1,15)];
• L64=[p32(−16,−1),0,p32(1,13),−1,1,0−1,−1,p32(−13,−1),0,p32(1,15)];
• L64=[p32(−16,−1),0,p32(1,13),1,−1,0,1,1,p32(−13,−1),0,p32(1,15)];
• L64=[p32(−16,−1),0,p32(1,13)1,−1,0,1,−1,p32(−13,−1),0,p32(1,15)];
• or
• L64=[p32(−16,−1,0,p32(1,13),1,1,0,−1,−1,p32(−13,−1),0,p32(1,15)];
• wherein Lk, represents the target long training sequence, k is a ratio of a bandwidth of the PPDU to 20 MHz and is a positive integer greater than or equal to 1, a1, a2, and ak are −1 or 1, L64 represents a target long training sequence whose length is 64, x1 is −1 or 1, x2 is −1, p32=[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],p32(−16,−1) represents a sequence that is from a value whose sequence number is −16 in p32 to a value whose sequence number is −1 in p32, p32(1,13) represents a sequence that is from a value whose sequence number is 1 in p32 to a value whose sequence number is 13 in p32, p32(−13,−1) represents a sequence that is from a value whose sequence number is −13 in p32 to a value whose sequence number is −1 in p32, and p32(1,15) represents a sequence that is from a value whose sequence number is 1 in p32 to a value whose sequence number is 15 in p32.