Method and device for detecting rru standing wave ratio of remote radio frequency unit

Abstract

The invention discloses a standing wave ratio detection method and device for a remote radio unit (RRU), which do not add any new detection module to a feedback link, and can increase the detection precision of a VSWR (Voltage Standing Wave Ratio) and simplify a testing process. The method comprises the following steps: S1, calculating input power P1 of an ADC (Analog to Digital Converter) port inthe case of feedforward feedback connection and input power of the ADC port in the case of backward feedback connection; S2, correcting the P1 and the P2 to obtain output power PFD and reflected power PRD of an RRU module respectively; and S3, calculating an antenna port VSWR during normal operation of the RRU.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for detecting standing wave ratio of a remote radio frequency unit RRU. Background technique [0002] VSWR (Voltage Standing Wave Ratio, voltage standing wave ratio) is an important performance parameter of the base station RRU (Remote RadioUnit, remote radio unit). The standing wave ratio of the antenna port reflects the matching of the antenna. The deterioration of the standing wave ratio indicates the signal transmission effect Very poor, which means that the signal strength reflected back to the RRU module at the antenna port becomes larger, which will cause damage to the internal circulator and power amplifier of the RRU in terms of hardware, and will reduce the gain and sensitivity of the channel in terms of the system, so in order to ensure the system The normal performance of the antenna port must be detected and adjusted in real time for the st...

AI Technical Summary

Problems solved by technology

[0006] In the existing technology, the voltage detection method can only reduce the leakage error of the circulator in the link in terms of calculation accuracy, and cannot eliminate the influence of other devices (couplers, cavity filters) in the link on the reverse power. A voltage detection module is added to the design of the system link, which increases the design complexity of the link, increases the PCB layout, and increases the cost;

[0007] The antenna port calibration method theoretically reduces the impact of the three errors of directional error D, source mismatch error Ms, and frequency response error Tr on the standing wave ratio. For the remote radio frequency unit RRU, the coupler and antenna port A cavity filter is added between the three, and the conversion relationship between the three and S11 does not conform to the calculation formula, so the calculation results cannot be applied in the RRU system, and the complexity of the test will also reduce production efficiency

[0008] In summary, the above two existing technologies have certain problems in the accuracy of the calculation method, the applicability of RRU, the control mechanism and the production cost.

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