Self-excitation detection method and self-excitation detection module thereof for repeater
A detection method and repeater technology, applied in radio relay systems, active power relay systems, relay system monitoring and other directions, can solve problems such as affecting link services, misjudgment, and severe fluctuations in service signals. Achieve high sensitivity, reduce the possibility of misjudgment, and achieve the effect of low cost
Active Publication Date: 2016-02-10
XIAN HUAXUN TIANJI COMM TECH CO LTD
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[0004] However, when it is necessary to adjust the attenuation of the link channel to determine whether it is self-excited, this adjustment process will affect the services in the link; in addition, if the service signal fluctuates violently, the existing method may also cause misjudgment
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[0021] The repeater and mobile phone partner are mainly for GSM, CDMA or LTE and other standards. The service signal has a certain bandwidth, such as single-carrier GSM 200kHz bandwidth, LTE has 1.4MHz, 3MHz, 5MHz, 10MHZ, 15MHz, 20MHz bandwidth, etc.; The signal generated by self-excitation is generally a sinusoidal monotone signal with a relatively narrow bandwidth in the frequency domain, and the monotone frequency will change slowly over time. Therefore, it is easy to distinguish whether it is a self-excited signal or a service signal on the spectrum analyzer. The present invention judges based on the difference in bandwidth between the service signal and the self-excited signal.
[0022] Such as figure 1 As shown, the detection signal is extracted from the power amplifier output of the repeater through the coupler, and sent to the self-excitation detection module for self-excitation detection. In the self-excited detection module, the input signal is divided into two pat...
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The invention provides a novel self-excitation detection method for a repeater. Self-excitation detection is realized without interruption or influence of services. The self-excitation detection method for the repeater comprises the following links: extracting a power amplifier output signal of the repeater, and dividing the power amplifier output signal into two signals, wherein the first signal is fed into a signal processing unit together with the second signal after being delayed; correspondingly processing the two signals by the signal processing unit according to the characteristics that a self-excitation signal is a sinusoidal single-tone signal, a relative bandwidth service signal in a frequency domain is relatively narrow, and the single-tone frequency can be slowly changed along with the time; judging whether the power amplifier output signal of the repeater has single-tone signal characteristics by detecting and calculating the change condition of the signal output by the signal processing unit along with the time, such that whether self-excitation exists or not can be judged.
Description
technical field [0001] The invention relates to a repeater self-excited detection method and hardware implementation. Background technique [0002] In wireless communication, operators and customers often need to use repeaters or mobile phone companions to improve wireless network coverage; however, the self-excitation of repeaters has always been a headache. If the self-excitation is not well controlled, not only the repeater It will fail by itself, and it will also interfere with the base station, causing the network to be paralyzed. Therefore, self-excited detection and self-excited processing have become necessary functions in devices such as repeaters or mobile phone companions, which directly determine the availability of repeaters. [0003] Existing self-excitation detection technology such as Chinese patent application 200710124555.7 discloses "A Method for Self-excitation Detection and Processing of Repeater Stations". The attenuator detects the change of the atte...
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IPC IPC(8): H04B17/40H04B7/15
Inventor 胡海成
Owner XIAN HUAXUN TIANJI COMM TECH CO LTD