A Consistency Measuring Device and Method for Reciprocity and Synchronization of Large-Scale Antenna Arrays

Abstract

The invention discloses a consistency measurement device for reciprocity and synchronization of a large-scale antenna array. The large-scale antenna array is decomposed into a plurality of sub-arrays, each sub-array includes several channels, and each sub-array is connected to a sub-array. The array measurement module is cascaded with the adjacent pre-stage measurement module or post-stage measurement module through feeder lines to form a closed loop. The sub-array measurement module includes a calibration channel, a plurality of couplers, a reference channel, a channel selector and a measurement unit, the calibration channel is an additional channel, and the reference signal is sent to each antenna array channel in the sub-array through the coupler, Alternatively, the reference signals sent from each antenna array channel in the sub-array are received through a coupler.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a consistency measuring device and method for the reciprocity and synchronization of a large-scale antenna array. Background technique [0002] In order to cope with more complex application environments, massive MIMO (Multiple-Input Multiple-Output) wireless communication systems can adopt long-distance and distributed arrays to meet the increasing transmission speed and user capacity requirements . In practical application, high requirements are also put forward for the reciprocity and synchronization between multiple channels; therefore, it is necessary to measure the consistency of reciprocity and synchronization between antenna array channels to complete the calibration . With the continuous increase of the channel scale and signal bandwidth of massive MIMO systems, the complexity of the calibration system also increases rapidly, and there are obvious bot...

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Problems solved by technology

In this invention, all RRH modules must be connected to an independent RRH inter-calibration module to complete the inter-RRH inter-module calibration. The disadvantage is that when the antenna array scale is large, the number of RRH modules is large, and the number of channels is large, each RRH Connecting to the public inter-RRH calibration module will consume a lot of hardware overhead, and the location layout between the RRH calibration module and the RRH, and the scale of the feeder network will also become complicated, and its scalability cannot meet the reciprocity calibration of large-scale MIMO arrays. needs

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