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Distributive beam forming method based on closed loop frequency offset control

A distributed, frequency-controlled technology, applied in power management, wireless communication, electrical components, etc., can solve the problems of node crystal oscillator frequency drift, low frequency synchronization efficiency, reduced communication efficiency, etc., to reduce non-communication energy consumption, eliminate Convergence process, the effect of fast synchronization time

Active Publication Date: 2012-08-15
天元瑞信通信技术股份有限公司
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AI Technical Summary

Problems solved by technology

[0005] The method of carrier frequency offset estimation and compensation needs to face two problems. One is that it is difficult to estimate the extremely small frequency offset
Because this means that during frequency synchronization, a high signal-to-noise ratio is required to collect a waveform with a long period, and then estimate its frequency to ensure the accuracy of frequency difference estimation, resulting in low efficiency of frequency synchronization
And even small frequency deviations can prevent long-term reliable communication
The second is that there is frequency drift in the node crystal oscillator. Even in the frequency synchronization stage, each node has accurately synchronized the local oscillator.
In a communication from a node to a receiving base station, it is necessary to re-synchronize the frequency and phase of all nodes at regular intervals so that a communication can be completed smoothly, which will undoubtedly bring extremely high complexity and communication efficiency reduction

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  • Distributive beam forming method based on closed loop frequency offset control
  • Distributive beam forming method based on closed loop frequency offset control
  • Distributive beam forming method based on closed loop frequency offset control

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Embodiment Construction

[0054] The inventive concept of the present invention is:

[0055] 1. Assign a new frequency point to the feedback signal. The communication of all nodes to the base station and the feedback of the base station to the node cluster can be carried out simultaneously, and a real-time closed-loop feedback system is obtained to control the frequency offset. To achieve the purpose of maintaining full feedback control during the communication process between all nodes and the receiving base station;

[0056]2. When the initialization is completed, the signals transmitted by all nodes are directly superimposed in the same direction at the base station. In order to achieve the purpose of directly finding an extreme point of the system, let the system change around the extreme point in the initial situation, thereby bypassing the slow convergence process of the system. This can be done by receiving the radio frequency carrier broadcast by the base station to all nodes. Because the lo...

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Abstract

The invention discloses a distributive beam forming method based on closed loop frequency offset control, and is characterized by comprising the following steps: (1) a reception base station broadcasts radio frequency carrier frequency during initialization, all the nodes carry out phase rectification, transmission signals are overlapped at the reception base station in a short time, and the power gain reaches the maximum value; and (2) the reception base station broadcasts feedback signals to all the nodes while effective communication is realized, and the points randomly adjust the respective carrier wave phase. The frequency offset of the nodes is controlled by utilizing the method, thereby the gain of the reception base station is maintained and the purpose of stable communication for a long time is achieved.

Description

technical field [0001] The invention relates to a method for maintaining the receiving power gain of a base station and achieving a long-term stable communication effect by controlling the frequency deviation of each node in a node cluster through closed-loop control. The method can be applied in the distributed beamforming long-distance transmission system of wireless sensor clusters. Background technique [0002] The most prominent feature of distributed beamforming is that the local oscillators of different source nodes are independent of each other. Most of the local oscillators are obtained by upmixing the node's local crystal oscillator. However, the frequency deviation of the local crystal oscillator is almost impossible to avoid. After up-mixing, the frequency deviation of the crystal oscillator will be amplified. Such a frequency offset is fatal to the cooperative communication between nodes, because it means that the phase between nodes is constantly drifting dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/08H04W52/24
Inventor 曹晨邓科
Owner 天元瑞信通信技术股份有限公司
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