Self-excited detection method and device for wireless repeater

Abstract

The invention provides a self-excitation detection method and a device for an RF repeater. The method comprises the following steps of after the RF repeater is powered on, acquiring an uplink antennaisolation degree and a downlink antenna isolation degree; respectively comparing the obtained uplink antenna isolation degree and the obtained downlink antenna isolation degree with a pre-designed uplink gain and a pre-designed downlink gain, and judging whether the RF repeater has the slight self-excitation condition or the severe self-excitation condition according to the comparison result. According to the self-excitation detection method and the self-excitation detection device for the RF repeater provided by the invention, the accurate measurement of the isolation degree of an access antenna and a return antenna can be realized under the condition that no signal is forwarded. When the requirement for the isolation degree of an antenna is smaller than a designed requirement, the self-excitation risk of the mounting personnel is prompted. Therefore, the condition that the signal-to-noise ratio of a forwarded signal gets worse caused by slight self-excitation, dramatically deteriorates caused by severe self-excitation and even damages an RF device can be avoided. In addition, the isolation degree between the access antenna and the return antenna is measured by means of the self-circuit of the RF repeater. Moreover, no extra hardware cost is added.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a self-excited detection method and device of a wireless repeater. Background technique [0002] The wireless repeater is a radio transmission relay device that enhances the signal in the process of wireless communication transmission. The isolation of the transceiver antenna is an important parameter for selecting the repeater type. The receiving signal and the forwarding signal of the same-frequency repeater are at the same frequency point. If the antenna is not installed properly, the isolation of the receiving and transmitting antenna is not enough, and when it is close to or less than the channel gain, the output signal is fed back to the input terminal after a delay, forming a positive feedback path, resulting in The output signal is severely distorted and self-excited. Slight self-excitation causes the signal-to-noise ratio of the forwarding signal to drop...

AI Technical Summary

Problems solved by technology

[0005] It is impossible to judge whether the wireless repeater is in the state of slight self-excitation or severe self-excitation. Since self-excitation detection has a certain hysteresis, once severe self-excitation occurs during the detection process, the RF device may have been damaged.

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