A carrier synchronization method and system for distributed wireless network
A wireless network, carrier synchronization technology, applied in synchronization devices, wireless communications, electrical components, etc., can solve the problem of carrier signal phase deviation, can not solve the problem of carrier phase offset, etc., to achieve the effect of eliminating phase changes
Inactive Publication Date: 2016-12-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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This method suffers from an unknown phase offset between the carrier signals due to the Doppler effect and the unknown propagation delay
[0005] In April 2007, R.Mudumbai, G.Barriac and U.Madhow proposed a closed-loop master-slave structure in "On the feasibility of distributed beamforming in wireless networks" published in IEEE Transactions onWireless Communications, Volume 6, Issue 4 frequency synchronization algorithm, but the disadvantage of this method is that the closed-loop frequency synchronization algorithm of the master-slave structure presupposes that time synchronization has been established
[0006] In short, although the existing synchronization mechanisms can achieve carrier frequency synchronization, they cannot solve the problem of carrier phase offset.
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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, but they are not further limitations on the present invention.
[0039] Such as figure 1 As shown, a carrier synchronization method for a distributed wireless network provided by the present invention includes the following steps: each slave node of the distributed wireless network sends a synchronization calibration signal to the master node of the distributed wireless network; the master node will receive After adjusting the amplitude of the synchronization calibration signal, it is rebroadcast to all slave nodes; the slave node estimates the frequency synchronization error and initial phase fluctuation with the master node from the received signal; the slave node calculates the frequency synchronization error and initial phase fluctuation according to the estimated frequency synchronization error Adjust the carrier frequency of the slave node.
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The invention discloses a carrier synchronization method and system for a distributed wireless network, which is characterized in that: each slave node of the distributed wireless network sends a synchronization calibration signal to the master node of the distributed wireless network; the master node will The received synchronization calibration signal is re-broadcasted to all slave nodes after amplitude adjustment; the slave node estimates the frequency synchronization error and initial phase fluctuation with the master node from the received signal; the slave node estimates the frequency synchronization error and initial phase fluctuation according to the fluctuations to adjust the carrier frequency of the slave node. The carrier synchronization method for distributed wireless networks provided by the present invention does not need time synchronization between master and slave nodes and is not affected by Doppler effect.
Description
technical field [0001] The invention belongs to the technical field of wireless communication and relates to a carrier synchronization method, in particular to a carrier synchronization method and system for distributed wireless networks. Background technique [0002] Advances in wireless technology have prompted the rapid development of large-scale, low-cost wireless sensor networks. Wireless sensor networks can accomplish communication and remote sensing tasks. Each sensor can simultaneously complete environmental perception, data processing, information storage, and communication with other sensors. Sensors can cooperate to complete a certain task. Since the local crystal oscillators of each sensor are different, ensuring the time and frequency synchronization of multiple sensors is directly related to the user's communication quality and reliability. [0003] There are mainly two types of frequency / phase synchronization methods in distributed wireless networks: closed...
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IPC IPC(8): H04W56/00
Inventor 王文钦邵怀宗李林杨帆潘晔胡全
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA