Method and device for detecting interference signal

Abstract

The invention discloses a method and a device for detecting interference signals. The method comprises the following steps: dividing received radio-frequency signals into two paths: I and Q, and differing the phases of the two paths of signals by 90 degrees; inputting the signals of the I path to a first LPF, inputting the signals of the Q path to a second LPF, and setting the bandwidth of the first LPF to be always greater than that of the second LPF; judging whether the total power of the signals of the I path, which are outputted by the first LPF after filtering is greater than the total power of the signals of the Q path, which are outputted by the second LPF after filtering, and judging whether the comparison value of the total power of the two paths of signals is greater than a preset ACI determination threshold; and if so, determining that ACI signals exist. The invention has simple hardware structure and simple and convenient implementation.

Description

technical field [0001] The invention relates to detection technology, in particular to a method and device for detecting interference signals. Background technique [0002] In a zero-IF receiver (DCR, Direct Conversion Receiver), due to various reasons, various interference signals may appear, such as Adjacent Channel Interference (ACI, Adjacent Channels Interference) and the like. [0003] The ACI signal is located in a frequency band adjacent to the frequency band occupied by the desired signal. The desired signal mentioned here refers to a signal that needs to be processed by a zero-IF receiver. figure 1 It is a schematic diagram of the relationship between the existing ACI and the desired signal. Such as figure 1 As shown, assuming that N represents the desired signal, then N−1 and N+1 represent the ACI signal respectively; the ACI signal usually has the same bandwidth (BW, Bandwidth) as the desired signal. [0004] In addition, the ACI signal can be further divided ...

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Problems solved by technology

[0008] However, the above two detection methods will have certain problems when they are used for actual ACI signal detection. For example, in detection method 1), RFRSSI and baseband RSSI need to be used to detect interference signals, and the hardware implementation is relatively complicated, and cannot To know what kind of interference signal it is, in the detection method 2), it is necessary to perform analog-to-digital conversion on the signal, and use a power detector to compare the detection results before and after digital filter filtering. Similarly, the hardware implementation is more complicated and the corresponding cost is higher , not easy to popularize

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