System and method for increasing transceiving separation backscatter communication excitation distance

Abstract

The invention discloses a system and a method for increasing a transceiving separation backscatter communication excitation distance. In the system and the method, the exciter utilizes a repeater architecture to enable an excitation signal transmitted by the exciter and a carrier signal transmitted by the receiver to have high correlation, so that errors such as corresponding phase noise, frequency spectrum and the like are reserved in the excitation signal received by the receiver. The receiver is divided into two paths to receive a carrier signal transmitted by the receiver, an excitation signal transmitted by the exciter and an attached terminal feedback signal; then, the receiver takes a carrier signal transmitted by the receiver as a reference signal in digital processing; and interference of errors of phase noise, frequency spectrum, spatial multipath and the like of excitation signals transmitted by the exciter on feedback signals of the terminal is reduced or eliminated by means of iterative equalization and the like, so that the excitation distance of the transceiving separation backscatter communication system on the terminal is increased, and an error threshold value canbe flexibly adjusted as required.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a system and a method for increasing the excitation distance of the separated backscatter communication for sending and receiving. Background technique [0002] In order to reduce the complexity, cost and power consumption of IoT communication terminals, and increase the deployment density of terminals, it is usually desirable to use backscatter communication for IoT communication (such as RFID, etc.), and its working principle is similar to that of radar to detect reflected signals. The principle is similar, the target terminal does not actively transmit radio frequency signals, but completes the communication process by reflecting radio frequency excitation (or other sources) signals and superimposing its own feedback signals in the reflection. Since the high-power radio frequency module that actively transmits is removed, backscatter communication greatly redu...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a system and method for increasing the excitation distance of the separated backscatter communication for sending and receiving, which solves the problem that the original radio frequency excitation signal transmitted by the exciter in the backscatter communication becomes the interference signal of the receiver and the The limitations of errors such as phase noise, frequency offset, and spatial multipath lead to a decrease in the signal-to-noise ratio of terminal reflected signals, thereby limiting the distance of the backscatter communication system

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