Decentralized reciprocity calibration method and device

Abstract

The invention provides a reciprocity calibration method and a reciprocity calibration device applied to a time division duplex mode MIMO cooperative network. The reciprocity calibration can be carriedout in a decentralized manner through cooperation among base stations in a macro cell, and the decentralized calibration can reduce the overhead of a return link compared with the traditional centralized calibration method. The invention also discloses a reciprocity calibration method and a reciprocity calibration device for a time division duplex mode MIMO cooperative network. Joint calibrationbetween base stations allows MIMO networks to exhibit performance without being affected by reciprocity mismatch.

Description

technical field [0001] The present invention relates to the field of MIMO (Multi-Input Multi-Output, multiple-input-multiple-output) cooperative network, and more specifically, relates to a decentralized reciprocity calibration method and device for a time-division duplex mode MIMO cooperative network. Background technique [0002] In future high-density wireless networks, MIMO cooperative networks can significantly increase system data throughput and improve the network environment of cell edge devices. CoMP (Coordinate Multi-Point) JT (Joint Transmission) in HetNet (Heterogeneous Network) is a typical MIMO network collaboration technology. Base Station) is deployed in a macro cell, and these micro base stations jointly serve users in the macro cell. For example, joint precoding, power allocation, and beamforming are performed. The joint work of multiple base stations needs to share downlink CSI (Channel State Information, channel state information) and even share user da...

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Problems solved by technology

Self-calibration relies on strong mutual coupling responses between adjacent antennas or auxiliary hardware connections to achieve calibration, but there is no mutual coupling effect between antennas of different base stations, and it is not easy to deploy connecting lines. Obviously, therefore, self-calibration is not suitable for MIMO networks. joint calibration

OTA calibration is to estimate the calibration coefficient by sending pilot signals between antennas. However, most of the current OTA calibration methods are for single MIMO calibration. If these methods are directly used in joint calibration of MIMO networks, there will be many problems. Problems, such as requiring a large amount of signaling overhead, occupying a large amount of backhaul link resources, etc.

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