Patent ID: 11902077
Assignee: GUANGDONG UNIVERSITY OF TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The frequency division multiple access communication method based on the harmonic modulation technology according to claim 2, wherein based on the fixed harmonic mode stored in advance, the given harmonic component is used to calculate all two different signals, so that a specific process of demodulating the desired signal from other signals is as follows:
assuming that all harmonic modes are known:

Vout=a0f0+a2f2+a3f3+a4f4+a5f5+ . . . +anfm  (1)

where an represents a n-th harmonic coefficient, n=0, 2, 3, 4, . . . ; f0 represents the fundamental frequency; fm represents a m-th harmonic component, and m=2, 3, 4, . . . ;
at this time, both a first signal and a second signal are loaded on even and odd harmonics for transmission, respectively, and the following can be obtained:

Voutp=a0pf0+a2pf2+a4pf4+a6pf6+a8pf8+ . . .  (2)

Voutv=a0vf0+a3vf3+a5vf5+a7vf7+a9vf9+. . .  (3)

finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is:

Vout=a0vf0+a0pf0+a2pf2+a3vf3+a4pf4+a5vf5+a6pf6+a7vf7+a8pf8+a9vf9+ . . .  (4)

it can be known from (1) and (4) that:

a0vf0+a0pf0=a0f0  (5)

a2pf2=a2f2; a4pf4=a4f4; a6pf6=a6f6; a8pf8=a8f8; . . .  (6)

a3vf3=a3f3; a5vf5=a5f5; a7vf7=a7f7; a9vf9=a9f9; . . .  (7)

since the fundamental frequency used when transmitting the first signal and the second signal is the same, only the harmonic components are different, and it can be known from (5) that:

a0vf0=a0pf0=½a0f0  (8)

therefore, according to formulas (6)-(8), the receiving end can demodulate both the first signal and the second signal.