Standing wave detecting-adjusting method

Abstract

The invention discloses detection method of standing wave. The method including : A. the first load mismatch which the standing wave coefficient is bigger than the first standard standing wave threshold value is connected in the TX of the detected sky-feedback module, At that time, it calculates the first amendment value; B. the second load mismatch which the standing wave coefficient is smaller than the first standard standing wave threshold value is connected in the TX of the detected sky-feedback module to validate the first amendment value and modifies it according to the validating result to get the second amendment value.

Description

technical field [0001] The invention relates to the communication field, in particular to a standing wave detection and commissioning method. Background technique [0002] The composition of the radio frequency part of the mobile communication base station transmission channel is generally as follows figure 1 shown, including transceivers, power amplifiers, and duplexers. The antenna feeder interface of the base station is generally called the antenna feeder port; the antenna feeder module: the last module of the base station transmission channel in the direction of signal flow, and the external interface is the antenna feeder port. [0003] If the antenna feeder system of a mobile communication base station has an open circuit, a short circuit, or other faults that cause changes in the transmission impedance of the antenna feeder system (such as water entering the antenna, etc.), the reflection of the output power of the base station in the antenna feeder system will incre...

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Problems solved by technology

[0013] First, the isolation of ports 1 and 3 of the circulator is not enough, and the forward signal will be coupled to the reverse detection circuit;

[0014] Second, the wave reflected from the antenna feeder will be superimposed on the forward coupling signal after passing through the duplexer to the reverse detection circuit channel, because the phase shift of the electromagnetic wave duplexer at different frequencies is different, and each duplexer The phase shifts of the detectors are not the same, so it is impossible to predict whether the reverse wave and the forward wave will be superimposed in the same phase or anti-phase on the reverse detection channel, or superimposed according to other phase relationships.

[0016] In the prior art, the difference in insertion loss of the front reverse coupling circuit is usually ignored, the influence of the forward wave coupling to the reverse coupling channel is ignored, and no correction value is added. The problem caused by this is that the standing wave detection error is relatively large, and The error levels of different modules are different; the requirements for device consistency and PCB processing consistency are high; there are certain restrictions on the design, such as the position of the coupling point of the front and back waves, and the selection of the device. If the value without correction is used In this case, it is best to place the front and reverse coupling points as close as possible to the antenna feeder port and choose a directional coupler with a good degree of orientation. This increase in requirements will inevitably affect maintenance, design and other work

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