Symbol detecting method of environment back scattering system based on differential Manchester encoding
A technology of backscattering and detection methods, applied in baseband systems, baseband system components, and transmission modification based on link quality, etc., can solve problems such as errors and obvious communication delays, and achieve a wide range of applications.
Active Publication Date: 2018-04-13
ZHEJIANG UNIV
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[0005] The existing detection method generally compares the energy of the received signal with the threshold. The disadvantage of this type of detection method is that it needs to estimate the decision threshold, which will introduce errors and obvious communication delays; it is only applicable to "0" and "1" is equally probable
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[0026] The present invention will be further described below in combination with specific embodiments and accompanying drawings.
[0027] Such as figure 1 As shown, the environmental backscattering system is composed of an environmental radio frequency signal source, an electronic tag and a reader. The environmental backscattering system uses the environmental radio frequency signal as a carrier signal, and the electronic tag modulates the carrier signal. Information.
[0028] Among them, h st 、h tr and h sr Represent the channel parameters between the environmental radio frequency signal source and the electronic tag, the electronic tag and the reader, and the environmental radio frequency signal source and the reader, and assume that it is a Rayleigh channel that is invariant in the coherence time.
[0029] Such as figure 2 As shown, the symbol detection method of the ambient backscatter system based on differential Manchester encoding includes the following steps:
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The invention relates to a symbol detecting method of an environment back scattering system based on differential Manchester encoding. The environment back scattering system comprises an environment RF signal source, an electronic label and a reader. The method comprises the following steps of 1), performing differential Manchester encoding on an original binary system symbol by the electronic label, and deciding to reflect or not reflect an environment RF signal according to the differential Manchester code; and 2), judging an original binary system symbol of the electronic label by the reader according to a received signal by means of a combined comparison detecting method. The system detecting method does not require any channel information and can realize detection by means of energiesof two adjacent symbols.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a symbol detection method of an environment backscattering system based on differential Manchester coding. Background technique [0002] The backscatter communication system transmits information by reflecting or not reflecting the carrier wave of the electronic tag. The most famous application is the radio frequency identification system. Its working mechanism is: the reader emits a radio frequency carrier signal, the electronic tag modulates the carrier signal, and sends it to the reader reader, and finally the reader demodulates the received signal. However, the process of the reader transmitting the radio frequency carrier signal needs to consume more power, which leads to high cost and power consumption of the reader. [0003] In order to meet the low-cost and low-power requirements of the Internet of Things, researchers have proposed an environmental backscattering sy...
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IPC IPC(8): H04L1/00H04L25/03H03M5/12G06K7/10
CPCH03M5/12H04L1/0014H04L1/0033H04L1/0036H04L25/03312G06K7/10009
Inventor 钟财军陶琴张朝阳
Owner ZHEJIANG UNIV