CN119561560A - An interference elimination device suitable for wideband receiver - Google Patents
An interference elimination device suitable for wideband receiver Download PDFInfo
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- CN119561560A CN119561560A CN202411763860.0A CN202411763860A CN119561560A CN 119561560 A CN119561560 A CN 119561560A CN 202411763860 A CN202411763860 A CN 202411763860A CN 119561560 A CN119561560 A CN 119561560A
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Abstract
本发明涉及一种适用于宽带接收机的干扰消除装置，属于无线通信技术领域。本装置包括第一功分器、第二功分器、滤波器、模数转换器ADC、信号处理单元、数模转换器DAC和合路器。第一功分器将宽带射频信号分为参考信号和预消除接收信号。参考信号被分成多路窄带射频信号，经过ADC转换成数字信号后送到信号处理单元，检测出干扰信号成分。信号处理单元生成相应的数字反相抵消信号，通过DAC转换成射频抵消信号。射频抵消信号送到合路器与预消除接收信号进行合路。预消除接收信号含有的干扰成分被抵消信号相加抵消，得到抵消后的有用信号。本装置对宽带接收机接收到的射频信号进行自适应干扰抵消，避免宽带接收机被带内干扰阻塞，并使其获得更大动态范围。
The present invention relates to an interference elimination device suitable for a broadband receiver, and belongs to the field of wireless communication technology. The device comprises a first power divider, a second power divider, a filter, an analog-to-digital converter ADC, a signal processing unit, a digital-to-analog converter DAC and a combiner. The first power divider divides a broadband radio frequency signal into a reference signal and a pre-elimination receiving signal. The reference signal is divided into multiple narrow-band radio frequency signals, which are converted into digital signals by the ADC and sent to the signal processing unit to detect interference signal components. The signal processing unit generates a corresponding digital inverted cancellation signal, which is converted into a radio frequency cancellation signal by the DAC. The radio frequency cancellation signal is sent to the combiner to be combined with the pre-elimination receiving signal. The interference components contained in the pre-elimination receiving signal are added and offset by the cancellation signal to obtain a useful signal after the offset. The device performs adaptive interference cancellation on the radio frequency signal received by the broadband receiver to prevent the broadband receiver from being blocked by in-band interference and enable it to obtain a larger dynamic range.
Description
Technical Field
The invention relates to an interference elimination device suitable for a broadband receiver, and belongs to the technical field of wireless communication.
Background
Currently, analog-to-digital converters (ADCs) can provide higher and higher instantaneous bandwidths, enabling their use in wideband digital receivers in the wireless communications field. Because the input voltage range of the high-speed ADC is relatively small, if the signal input to the high-speed ADC contains an interference component, the available dynamic range is further reduced, and in severe cases, the input of the ADC is even saturated, so that the wideband digital receiver cannot work normally. Therefore, wideband digital receivers are more susceptible to in-band interference than conventional narrowband receivers. Furthermore, since the interference frequency and the amount of interference in the wideband signal are often not fixed, it is difficult to filter the interference using a specific filter.
Disclosure of Invention
The invention aims to solve the technical problem that the ADC of a broadband digital receiver is saturated easily due to in-band interference in a broadband radio frequency signal, so that the ADC cannot work normally, and creatively provides an interference elimination device suitable for the broadband receiver.
The device belongs to an active interference elimination device, and can perform self-adaptive interference cancellation on radio frequency signals received by a broadband receiver, avoid the broadband receiver from being blocked by in-band interference, and enable the broadband receiver to obtain a larger dynamic range.
The invention aims at realizing the following technical scheme:
An interference elimination device suitable for a broadband receiver comprises a first power divider, a second power divider, a filter, an analog-to-digital converter ADC, a signal processing unit, a digital-to-analog converter DAC and a combiner.
Wherein the filter is composed of a plurality of narrowband band-pass filters with different frequency bands, and the filters can cover the whole broadband signal.
The device receives an external broadband radio frequency signal through a receiving antenna.
The first power divider divides the received broadband radio frequency signal into two paths, one path is used as a reference signal for generating a cancellation signal, and the other path is used as a pre-cancellation receiving signal.
The second power divider subdivides the reference signal into multiple paths, which are respectively supplied to the input terminals of the respective filters.
Each filter converts the broadband radio frequency signal into a narrowband radio frequency signal and sends the narrowband radio frequency signal to a corresponding ADC (analog to digital converter);
the ADC converts the narrowband radio frequency signal into a digital signal and sends the digital signal to the signal processing unit;
the signal processing unit processes the digital signal to generate a digital signal which is opposite to the interference signal and sends the digital signal to the DAC;
the DAC converts the digital signal which is opposite to the interference signal into a radio frequency offset signal which is opposite to the interference signal, and sends the radio frequency offset signal to the combiner;
the combiner adds the radio frequency offset signal and the pre-cancellation received signal, and the interference signal contained in the pre-cancellation received signal is offset in an opposite phase to obtain an interference offset received signal.
Advantageous effects
Compared with the prior art, the invention has the following advantages:
The device divides the broadband radio frequency signal into a plurality of paths of narrowband signals and sends the narrowband signals to the ADC for collection. The detection is performed via a signal processing unit, further generating an inverted cancellation signal. The combiner adds the received signals from the receiving antennas, interference components in the received signals are added and offset by offset signals, only useful signals are output, the problem of saturation caused by in-band interference of the ADC of the subsequent broadband digital receiver is effectively avoided, and the dynamic range of the receiver under the condition of in-band interference is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention;
the antenna comprises a 100-receiving antenna, a 200-interference elimination device, a 201-first power divider, a 202-second power divider, a 203-filter, a 204-ADC, a 205-signal processing unit, a 206-DAC and a 207-combiner.
Detailed Description
The summary is further illustrated in the drawings and examples below.
Examples
As shown in fig. 1, an interference cancellation device 200 suitable for a wideband receiver includes a first power divider 201, a second power divider 202, a filter 203, an adc204, a signal processing unit 205, an dac206, and a combiner 207.
Wherein the input of the first power divider 201 is connected to the receiving antenna 100. The output of the first power divider 201 is connected to the input of the second power divider 202 and the input of the combiner 207, respectively. An output of the second power divider 202 is connected to an input of each filter 203, an output of the filter 203 is connected to an input of a corresponding ADC204, and an output of the ADC204 is connected to an input of the signal processing unit 205. An output of the signal processing unit 205 is connected to an input of the DAC 206. An output of DAC206 is connected to an input of combiner 207. The output of the combiner 207 is connected to an external receiver.
The working method of the device is as follows:
The first power divider 201 divides the broadband radio frequency signal received by the receiving antenna 100 into two paths, one path is used for generating a reference signal for the cancellation signal, and the other path is used as a pre-cancellation receiving signal, and the components of the two paths are identical.
The reference signal is passed through a second power divider 202 and then fed into a filter 203, where it is divided into multiple narrowband radio frequency signals. The multipath narrowband radio frequency signals are converted into digital signals through the ADC204, and the digital signals are sent to the signal processing unit 205 for processing, so that interference signal components are detected. The signal processing unit 205 then generates a corresponding digital inverted cancellation signal, which is converted to a radio frequency cancellation signal by the DAC 206. The rf cancellation signal is provided to a combiner 207 for combining with the pre-cancellation receive signal. The interference component contained in the pre-cancellation received signal is added and cancelled by the cancellation signal, and the cancelled useful signal is obtained and sent to the receiver.
Further, the wideband radio frequency signal R (t) received by the receiving antenna 100 is split into two paths of reference signal and pre-cancellation received signal by the first power splitter 201, and the two paths of signals have the same component and are denoted as R (t). Wherein r (t) contains a useful signal component u (t) and an interfering signal component X (t), r (t) =u (t) +x (t). The reference signal r (t) is further equally divided into several paths of signals r' (t) of identical composition via the second power divider 202. r' (t) is filtered into a narrowband radio frequency signal by a filter 203 with different frequency bands, and sent to an ADC204. The ADC204 converts the narrowband radio frequency signal into a digital signal, and sends it to the signal processing unit 205. The signal processing unit 205 performs interference component detection on each path of narrowband signal, generates a corresponding digital inverted cancellation signal, and converts the digital inverted cancellation signal into a radio frequency cancellation signal c (t) through the DAC206, that is, c (t) = -X (t).
The rf cancellation signal c (t) is combined with the pre-cancellation received signal r (t) in the combiner 207, and the interference cancelled signal y (t) is obtained from the output end of the combiner 207:
y(t)=r(t)+c(t)=u(t)+X(t)-X(t)=u(t)
While the foregoing detailed description has described the objects, aspects and advantages of the invention in further detail, it should be understood that the foregoing description is only illustrative of the invention, and is intended to cover various modifications, equivalents, alternatives, and improvements within the spirit and scope of the present invention.
Claims (1)
1. An interference cancellation device suitable for a wideband receiver, comprising a first power divider (201), a second power divider (202), a filter (203), an ADC (204), a signal processing unit (205), a DAC (206) and a combiner (207);
The power divider comprises an input end of a first power divider (201) and a receiving antenna 100, wherein the output end of the first power divider (201) is connected with an input end of a second power divider (202) and an input end of a combiner (207) respectively, the output end of the second power divider (202) is connected with an input end of each filter (203), the output end of each filter (203) is connected with an input end of a corresponding ADC (204), the output end of each ADC (204) is connected with an input end of a signal processing unit (205), the output end of the signal processing unit (205) is connected with an input end of a DAC (206), the output end of the DAC (206) is connected with an input end of the combiner (207), and the output end of the combiner (207) is connected with an external receiver;
the filter (203) is composed of a plurality of narrow-band-pass filters with different frequency bands, and the filters can cover the whole broadband signal, each filter converts the broadband radio frequency signal into a narrow-band radio frequency signal and sends the narrow-band radio frequency signal to a corresponding ADC, and each filter is correspondingly provided with an ADC;
the first power divider (201) divides a received broadband radio frequency signal into two paths, one path is used for generating a reference signal of a cancellation signal, the other path is used as a pre-cancellation receiving signal, the components of the two paths of signals are identical, the reference signal is sent to the filter (203) after passing through the second power divider (202) and is divided into a plurality of paths of narrow-band radio frequency signals, the plurality of paths of narrow-band radio frequency signals are converted into digital signals through the ADC (204), the digital signals are sent to the signal processing unit (205) for processing, interference signal components are detected, then the signal processing unit (205) generates corresponding digital inverted cancellation signals, the corresponding digital inverted cancellation signals are converted into radio frequency cancellation signals through the DAC (206), the radio frequency cancellation signals are sent to the combiner (207) and are combined with the pre-cancellation receiving signal, and interference components contained in the pre-cancellation receiving signal are added and cancelled by the cancellation signals, and the cancelled useful signals are sent to the receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411763860.0A CN119561560A (en) | 2024-12-03 | 2024-12-03 | An interference elimination device suitable for wideband receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411763860.0A CN119561560A (en) | 2024-12-03 | 2024-12-03 | An interference elimination device suitable for wideband receiver |
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| CN119561560A true CN119561560A (en) | 2025-03-04 |
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| CN202411763860.0A Pending CN119561560A (en) | 2024-12-03 | 2024-12-03 | An interference elimination device suitable for wideband receiver |
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