Backscatter communication system signal sending and receiving method
A technology of backscattering and communication system, applied in the field of data communication, can solve problems such as reducing the communication rate, and achieve the effect of increasing the communication rate and meeting the real-time performance.
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Embodiment 1
[0043] Such as figure 1 As shown, the present invention discloses a signal sending and receiving method of a backscatter communication system, the backscatter communication system includes a radio frequency source 1, a tag 2 and a reader 3, wherein the tag 2 receives the signal sent by the radio frequency source 1, reads The device 3 receives the signal sent by the radio frequency source 1 and the backscattered signal sent by the tag 2, including:
[0044] At the tag 2 end: directly reflect the received RF source 1 signal, and modulate the tag 2 end information by adjusting the antenna impedance;
[0045] At the reader 3 end: the received signal sent by the RF source 1 and the backscatter signal sent by the tag 2 are clustered through a clustering algorithm, and the different states of the tag 2 are identified and decoded by detecting and estimating the backscatter signal transfer data.
[0046] Among them, tag 2 includes three sets of antennas, antenna 1, antenna 2 and ante...
Embodiment 2
[0050] In this embodiment, on the basis of the structure of Embodiment 1, the signal B(t) is sent by the radio frequency source 1, and the specific signal of B(t) is "110101101011110100101111", and antenna 1 and antenna 2 change the backscatter signal by changing the antenna impedance amplitude to modulate its own bits, respectively, to receive the B 1 (t), B 2 (t), the specific signals are "110101101011" and "110100101111" respectively, such as figure 2 shown.
[0051] Specifically, the signals received by the reader from the backscattered signals from antenna 1 and antenna 2 are:
[0052] T 1 (t)=g*B 1 (t), T 2 (t)=g*B 2 (t);
[0053] Among them, the channel g between the radio frequency source and the label, B(t) represents the baseband signal of the access point;
[0054] The reader receives the signal y(t) expressed as:
[0055]
[0056] Among them, the RF source signal is S(t), the channel between the RF source and the reader is r, θ 1 , θ 2 To represent t...
Embodiment 3
[0084] In this embodiment, the basic model and theoretical model of Embodiment 1 and 2 are used to compare the transmission bit of the traditional environment backscatter tag and the multi-antenna tag. It can be concluded that the ambient backscattering of the two antenna tags can increase the communication rate by about 1 times. Specific results such as Figure 4 , 5 shown.
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