Cluster-based distributed antenna time frequency synchronizing method in wireless communication

Abstract

The invention relates to a cluster-based distributed antenna time frequency synchronizing method in wireless communication, and belongs to the technical field of wireless communication. The method comprises the following steps of: dividing mass distributed antennas into clusters, selecting cluster representative antennas, and performing distributed bidirectional coordinated synchronization on the cluster representative antennas; and then, initiating intra-cluster distributed bidirectional coordinated synchronization by the cluster representative antennas so as to finally realize time frequency synchronization of all distributed antennas in a system. The method has the following advantages that: through cluster division, a plurality of clusters are simultaneously synchronized, the total synchronization time is reduced and the synchronization speed is quickened; the synchronization between the cluster representative antennas is performed first and then the intra-cluster distributed bidirectional coordinated synchronization is performed so as to obtain higher synchronization precision and meet the requirement of a distributed wireless communication system for synchronization precision; and the synchronization between the distributed antennas is finished in advance so as to avoid multiple times of synchronization between a terminal user and a plurality of distributed antennas. The method reduces the system resource overhead of the terminal user, and improves the communication reliability.

Description

technical field [0001] The invention relates to a cluster-based distributed antenna time-frequency synchronization method in wireless communication, which belongs to the technical field of wireless communication. Background technique [0002] In the next-generation wireless communication system of the same-frequency network, in order to further improve the spectrum utilization rate of the system and the quality of service for users, distributed antennas or multi-base station coordination are often used for transmission. For example, Coordinated Multiple Point (Coordinated Multiple Point, CoMP for short) transmission technology is currently focused on by LTE-Advanced technology, which can effectively avoid or reduce inter-cell interference while maintaining high spectrum utilization of the system as much as possible. The most commonly used CoMP model is the networking mode based on BBU+RRU. Usually, one baseband unit (hereinafter referred to as BBU) is connected to multiple w...

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Problems solved by technology

[0006] (2) Since each slave node needs to adjust its own local crystal oscillator according to the reference signal sent by the master node, once the crystal oscillator deviation of the master node is too large, or each slave node has a large error when processing the reference signal, it will cause the master The slave node cannot complete the synchronization of the time frequency

Although the two-way polling synchronization mechanism can obtain high synchronization accuracy, the synchronization time overhead is too large

[0009] In short, the existing synchronization mechanisms have problems in system resource overhead, synchronization time and synchronization accuracy, and cannot achieve high-efficiency and high-precision time synchronization for multiple distributed antennas in distributed wireless communication systems / multi-base station cooperative communication systems. frequency synchronization

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