Communication method of radio frequency system and apparatus and system for implementing the method
A technology of a radio frequency system and a communication method, applied in the field of radio frequency systems, can solve the problems of reducing system coverage, communication blind spots, etc., and achieve the effect of reducing communication blind spots and improving communication performance
Inactive Publication Date: 2009-07-29
SIEMENS AG
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However, in order to achieve a better diversity effect, the coverage of these antennas needs to overlap to a certain extent, which will reduce the coverage of the entire system
[0008] Therefore, it is hoped that a new technical solution will be adopted to solve the problem of continuous communication blind spots in the above-mentioned system
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[0035] The basic idea of the present invention is to set up a reflection and transmission device in the radio frequency system, and the reflection and transmission device exhibits reflection characteristics and transmission characteristics to the radio frequency, so it can affect the radio frequency signal in the radio frequency system through reflection and transmission, in particular, The reflection and transmission device can change its reflection characteristics and transmission characteristics with time, so that some multipath signal components that change with time are introduced in the communication process of the radio frequency system, so that the field strength of each point in the coverage area of the radio frequency system also changes with time. and change. In this way, even if there are blind spots in certain locations in the communication process of the radio frequency system, it will only last for a limited period of time. Therefore, by using the time diver...
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The invention provides a communication method of a radio-frequency system and a device and a system for realizing the method, wherein, the radio-frequency system is provided with a reflection and transmission device; in the communication process, reflection characteristic and transmission characteristic presented by the reflection and transmission device to the radio frequency are changed so as to introduce multipath signal component which is changed along with the time; in the communication process, a transmitting device transmits communication signals to a receiving device which receives and synthetizes the multipath signal component of the communication signal; and the radio-frequency system utilizes time diversity effect to carry out communication. The invention is particularly applicable to a radio-frequency recognition system, and the method, the device and the system can effectively reduce continuous communication blind spots in the system, thus improving the success rate of the total reading of the radio-frequency recognition system to labels and achieving better balance with the time of the total reading.
Description
technical field [0001] The present invention relates to a radio frequency system, and in particular, to a communication method of a radio frequency system and a device and system for implementing the method. The present invention is particularly suitable for radio frequency identification (RFID) systems. Background technique [0002] Radio frequency based broadcast or communication systems often face the effects of multipath propagation. That is, due to reflections and refractions by objects in the environment, the transmitted wireless signal will travel from more than one propagation path to the receiving point. Signal components on different propagation paths will have different path delays, phase shifts, and signal attenuation. [0003] A typical wideband multipath channel is frequency selective. When the individual signal components are superimposed at the receiving point, they may enhance or cancel each other, depending on the frequency. In addition, broadband multi...
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IPC IPC(8): H04B7/02G06K17/00G06K19/07H04L1/02
CPCH04B5/00H04B7/02
Inventor 兰普·马蒂尔斯袁勇喻丹张洁霍尔斯特·迪特
Owner SIEMENS AG