Backscatter communication method, excitation device, backscatter device, and receiving device

A method, comprising:

• receiving, by a backscatter device, a first signal from an excitation device, wherein the first signal is further received by a receiving device, the first signal carries a first sequence, and the first sequence is used to perform first scrambling on backscatter device data, the backscatter device data produced by the backscatter device;
• modulating, by the backscatter device, the backscatter device data to the first signal to obtain a second signal, wherein the second signal carries the backscatter device data obtained after the first scrambling, the modulating comprising:
• performing, by the backscatter device, the first scrambling on the backscatter device data using the first sequence;
• and
• backscattering, by the backscatter device, the second signal to the receiving device, the second signal being different and separate from the first signal.

A method, comprising:

• receiving, by a receiving device, a first signal carrying a first sequence, wherein the first signal is further received by a backscatter device, and the first sequence is used by the backscatter device to perform first scrambling on backscatter device data, the backscatter device data produced by the backscatter device;
• receiving, by the receiving device, a second signal from the backscatter device, wherein the second signal carries the backscatter device data obtained after the first scrambling, and wherein the second signal is different and separate from the first signal;
• and
• demodulating, by the receiving device, the second signal based on the first sequence, to obtain the backscatter device data.