Node selection side lobe suppression method based on dual-ring in wireless sensor network

Abstract

The invention discloses a node selection side lobe suppression method based on dual-ring in a wireless sensor network. The method belongs to the field of the wireless communication, and mainly relatesto the node selection side lobe suppression method based on dual-ring in the sensor network cooperative beamforming. On the basis of the existing technology, the method based on the combination of the dual-ring and the sector is improved and design, the side lobe value of the cooperative beam is greatly reduced in the premise of guaranteeing the receiving end requirement SNR, and the side lobe iseffectively suppressed. The performance of the node selection scheme can be obtained by analyzing cooperative far field waveform received by a destination node, the suppression effect on the waveformside lobe by the method in this text can be obviously observed in the premise of guaranteeing narrow beam main lobe; when the node is enough sparse, the directivity of the cooperative beam is more obvious; the node selection is performed from ring and the sector, and the system performance advantage is improved; the sparsity of the node is effectively improved through a proposed method of performing crossing selection in the dual-ring sector, and the transmission performance is enhanced.

Description

technical field [0001] The invention belongs to the field of wireless communication, and mainly relates to a node selection sidelobe suppression method based on double rings in cooperative beamforming of a sensor network. Background technique [0002] In recent years, beamforming technology has been extensively studied, which is the integration of digital signal processing technology and antenna technology, and its purpose is to use for directional transmission and reception of signals to achieve maximum transmission efficiency. Beamforming technology can form the required signal in a specific direction through the weighted synthesis of signals from multiple antenna arrays. The most critical technology is MIMO (Multiple-Input Multiple-Output) technology, which aims to equip multiple antennas at the sending end and receiving end, significantly improving communication quality and channel capacity. However, in actual application scenarios, it is difficult for some terminals to...

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Problems solved by technology

In this document, the author also proposed a cooperative beamforming method based on random node positions, which laid a foundation for future scholars. However, due to the randomness of selecting nodes in this method, it may cause local nodes to gather, making it difficult to achieve good beamforming. The sparsity of the beam pattern generated by it has a wide main lobe and a high side lobe value, and the transmission efficiency is poor

In the literature [2], the author proposed that when the cooperative node is selected from the appropriate ring of the disk, the main lobe of the cooperative beam pattern will become narrower, which improves the network transmission performance to a certain extent, but the problem is that the side The lobe value is still high, which is unacceptable in some scenarios, and may cause unpredictable interference to nearby receiving base stations or APs

Literature [3] proposed a method based on the combination of sectors and rings for sensor node selection based on the predecessors, which made the main lobe more obvious. However, this method still does not solve the problem of excessive side lobe values.

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