CN115412111B - Self-adaptive time-frequency domain receiver with spectrum sensing capability - Google Patents
Self-adaptive time-frequency domain receiver with spectrum sensing capability Download PDFInfo
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- CN115412111B CN115412111B CN202210819843.9A CN202210819843A CN115412111B CN 115412111 B CN115412111 B CN 115412111B CN 202210819843 A CN202210819843 A CN 202210819843A CN 115412111 B CN115412111 B CN 115412111B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
In order to overcome the defects in the prior art, the invention provides a time-frequency domain receiver capable of synchronously receiving the time domain and the frequency domain of the burst high-energy large-bandwidth electromagnetic signals in a random electromagnetic spectrum noise environment, which can effectively synchronously capture the time domain and the frequency domain of the electromagnetic burst signals in space, and can jointly use global spectrum energy information and current spectrum energy information to calculate a comprehensive spectrum energy threshold value so as to improve the accuracy of burst spectrum signal detection. To avoid the burst spectrum in the random spectrum from being omitted, a mechanism for frequency domain received signal synchronization acquisition is triggered if and only if the time domain receiver is in a state above an energy threshold.
Description
Technical Field
The invention belongs to the technical field of radio, and particularly relates to a self-adaptive time-frequency domain receiver with spectrum sensing capability.
Background
In a complex electromagnetic spectrum environment, how to effectively perform real-time detection and analysis of various spectrum signals in each frequency band is always a difficulty in signal detection research. As shown in fig. 1. The solid line indicates that there is always a spectrum signal, the short dashed line indicates a periodic spectrum signal, and the long dashed line indicates an aperiodic burst spectrum signal. In a complex spectrum environment, as various spectrum signals in the plurality of frequency bands exist in a spectrum space, a narrow-band wireless receiver technology is generally adopted to capture the selected spectrum signals to obtain digital signals in a time domain for effectively capturing the signals, and signal analysis of spectrum domain characteristics can be completed through Fourier transformation.
In a wireless receiver, the receiver is generally designed by adopting an analog superheterodyne receiver or a direct sampling digital receiver, so as to complete time domain signal acquisition and frequency domain signal recovery. As shown in fig. 2, to employ the direct sampling digital receiver time and frequency domain implementation principle, it includes 3 parts:
the RF front end-the antenna receives the signal from the space, the RF filter and the image filter are used for suppressing the image frequency and the interference frequency, and the signal passes through an amplifying and gain adjusting control (AGC) module;
the direct digital sampling receiver, namely the radio frequency signal passes through an anti-aliasing filter and enters an ADC (analog-to-digital converter) to perform analog-to-digital conversion to obtain a digital signal of the spatial frequency spectrum signal;
digital intermediate frequency processing-the digital signal is subjected to digital down converter DDC to complete signal time domain capturing and filtering, and then is subjected to Fourier change to recover the space spectrum signal.
The method is characterized in that: for radio frequency spectrum signals in space, analog signal filtering is performed, and then an analog-to-digital converter (ADC) is adopted to obtain a digital domain time domain signal. Automatic power control (AGC) is used to achieve dynamic range requirements for power variation of the signal during frequency acquisition. And meanwhile, the frequency domain characteristics of the signals are further analyzed, and Fourier transformation (FFT) is carried out on the digital signals to obtain the characteristics of the frequency domain signals.
However, the prior art still has the following significant drawbacks:
1. the acquisition of the high dynamic burst spectrum signal cannot be achieved. If there is a coexistence of low energy signals and high energy signals in the spectrum environment, the real-time spectrum signal cannot be received efficiently because the power gain control (AGC) in the receiver cannot meet both gain control states.
2. There is a lack of efficient identification capability for different spectral environments. The simple selective receiver can only identify a section of signals in the frequency spectrum, and cannot comprehensively identify a wide-frequency spectrum environment. Since the burst spectrum is identified and predicted based on past spectrum history information, establishing historical spectrum environment energy is an effective means of burst spectrum signal detection.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a time-frequency domain receiver capable of synchronously receiving the time domain and the frequency domain of the burst high-energy large-bandwidth electromagnetic signals in a random electromagnetic spectrum noise environment, which can effectively synchronously capture the time domain and the frequency domain of the electromagnetic burst signals in space, and can jointly use global spectrum energy information and current spectrum energy information to calculate a comprehensive spectrum energy threshold so as to improve the accuracy of burst spectrum signal detection. To avoid the burst spectrum in the random spectrum from being omitted, a mechanism for frequency domain received signal synchronization acquisition is triggered if and only if the time domain receiver is in a state above an energy threshold.
The invention provides a self-adaptive time-frequency domain receiver with spectrum sensing capability, which comprises an analog low-pass filter, a linear amplifier, a power divider, an adjustable LOG amplifier, an adjustable linear amplifier, a filter, an analog-to-digital converter ADC, a matched filter, a polyphase filter, a time domain signal detector, a frequency domain signal detector and a spectrum detector, wherein the analog low-pass filter is used for receiving a frequency domain signal;
the analog low-pass filter is connected with one end of the linear amplifier, the other end of the linear amplifier is connected with the power divider, the power divider outputs two paths of signals, one path of signals is transmitted to the adjustable LOG amplifier, the output end of the adjustable LOG amplifier is connected with one end of the first filter, the other end of the first filter is connected with one end of the first analog-to-digital converter ADC, the other end of the analog-to-digital converter ADC is connected with one end of the matched filter, the other end of the matched filter is connected with the time domain signal detector, and the final time domain signal detector is connected with the frequency spectrum detector; the other path of signal is sent to an adjustable linear amplifier, the output end of the adjustable linear amplifier is connected with one end of a second filter, the other end of the second filter is connected with one end of a second analog-to-digital converter ADC, the other end of the second analog-to-digital converter ADC is connected with one end of a multi-phase filter, the other end of the multi-phase filter is connected with a frequency domain signal detector, and finally the frequency domain signal detector is connected with a frequency spectrum detector; the spectrum detector is respectively connected with the adjustable LOG amplifier and the adjustable linear amplifier through signal lines.
The time-frequency domain receiver receives radio frequency spectrum signals from an antenna, outputs the radio frequency spectrum signals to the power divider after passing through the analog low-pass filter and the linear amplifier, divides the signals into two paths, one path of the signals passes through the adjustable LOG amplifier, passes through the filter after being compressed and is output to the analog-digital converter ADC to obtain digital domain signals, then passes through the matched filter, outputs the signals to the frequency spectrum detector through the time domain signal detector, passes through the adjustable linear amplifier, amplifies the signals and passes through the filter, and outputs the signals to the analog-digital converter ADC to obtain digital domain signals, and then passes through the polyphase filter, outputs the signals to the frequency spectrum detector through the frequency domain signal detector, and the signal energy of the frequency spectrum detector is respectively connected to the adjustable LOG amplifier and the adjustable linear amplifier through the signal wire to control the adjustable LOG amplifier and the adjustable linear amplifier.
The receiving of the time-frequency domain signal comprises the steps of:
1) Starting a time-frequency domain receiver to finish initialization of a linear amplifier, a LOG amplifier, an analog-to-digital converter ADC, a matched filter, a polyphase filter and a spectrum detector;
2) After the initialization is finished, the global spectrum environment sensing is started to be executed: the spectrum signal passes through a linear amplifier, a filter, an analog-to-digital converter ADC, a multi-phase filter and a frequency domain signal detector, the signal is transmitted to the spectrum detector to scan the spectrum signal, the gain value of the linear amplifier is adjusted to calculate global spectrum energy one by one, after N times of scanning, spectrum energy average value calculation is carried out, the calculated result is assigned to the LOG amplifier as a threshold level value, and the waiting state is carried out after the completion of the calculation;
3) After the global spectrum environment sensing is finished, the current aperiodic burst spectrum signal capturing is started to be executed: after receiving signals from an antenna, dividing the signals into two paths through a power divider, respectively transmitting the two paths to a frequency domain signal detector and a time domain signal detector, capturing and detecting burst signals, wherein the time domain signal detector receives signals larger than a threshold level value, and the frequency domain signal detector also receives current aperiodic spectrum burst signals; if the time domain signal detector does not receive a signal greater than the threshold level value, the global spectral energy continues to be received in a loop.
The invention has the beneficial effects that
1) The detection effectiveness of the burst broadband signal in the random noise spectrum environment is improved, and the robustness of signal capturing is enhanced; 2) The dependency of the receiving system on the burst spectrum signal identification accuracy is reduced, namely, different strategies of sensing the environmental spectrum energy and identifying the burst spectrum energy in a self-adaption mode are adopted, and the method for identifying the environmental spectrum energy excessively can be timely adjusted, so that the environmental spectrum energy threshold in running is effectively limited in a certain range, and the receiver is ensured to still have higher performance; 3) The invention has strong universality, low realization cost and wide applicability.
Drawings
Fig. 1 is a schematic diagram of various spatial spectrum signals.
Fig. 2 is a schematic diagram of a direct sampling digital receiver.
Fig. 3 is an innovative schematic of the present invention.
Fig. 4 is a flowchart.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
As shown in fig. 3, the radio frequency spectrum signal from the antenna passes through an analog low-pass filter and a linear amplifier, then passes through a power divider (1), divides the signal into two paths, one path passes through an adjustable LOG amplifier (3) (mainly acting as threshold compression for space periodic signal energy), outputs the signal to an analog-to-digital converter ADC to obtain a digital domain signal after the signal is compressed, passes through a matched filter (4), outputs the signal to a spectrum detector (6) through a time domain signal detector (9), and the other path passes through an adjustable linear amplifier (2) (mainly acting as linear amplification for space spectrum signal), outputs the signal to the analog-to-digital converter ADC to obtain a digital domain signal after the signal is amplified, passes through a polyphase filter (5), and outputs the signal to the spectrum detector (6) through a frequency domain signal detector, and the signal energy of the spectrum detector is respectively connected to the adjustable LOG amplifier and the adjustable linear amplifier through signal lines (7) and (8).
In order to avoid that burst spectrum in the random spectrum is ignored and deleted, a detection energy threshold is set, and a mechanism for synchronously capturing the frequency domain received signal is triggered if and only if the time domain receiver is in a state above the detection energy threshold.
As shown in fig. 4, the time-frequency domain receiver workflow is as follows:
1. the receiver is started to finish the initialization of the linear amplifier channel, the LOG amplifier channel, the analog-to-digital converter, the matched filter, the polyphase filter and the spectrum detector.
2. After the initialization is finished, the global spectrum environment sensing in the execution program is started: the signal passes through the linear amplifier channel, the signal is transmitted to the spectrum detector, the spectrum signal is scanned, the global spectrum energy is calculated one by adjusting the gain value of the linear amplifier (2), the average value AVG_E is calculated after scanning N times, and the calculation result is assigned (3) LOG amplifier is used as a threshold level value, and the waiting state is entered after the completion of the calculation.
3. After the global spectrum environment sensing is finished, the current aperiodic burst spectrum signal capturing is started to be executed: after the antenna receives the signal, the signal is divided into two paths, and the two paths are respectively transmitted to the frequency domain receiver and the time domain receiver for capturing and detecting the burst signal, when the signal received by the time domain signal detector is larger than the threshold level value, the frequency domain signal detector also receives the current aperiodic spectrum burst signal. If the time domain signal receiver does not receive energy greater than the threshold level, the time domain receiver global spectrum energy continues to be cyclically received.
The energy calculation method comprises the following steps:
e (N) =i×i+q×q, wherein I, Q is a signal amplitude value, respectively.
AVG_E＝(E(1)+…+E(N))/N。
The present invention is not limited to the above-described specific embodiments, and various modifications and variations are possible. Any modification, equivalent replacement, improvement, etc. of the above embodiments according to the technical substance of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. An adaptive time-frequency domain receiver with spectrum sensing capability, characterized in that: the device comprises an analog low-pass filter, a linear amplifier, a power divider, an adjustable LOG amplifier, an adjustable linear amplifier, a filter, an analog-to-digital converter ADC, a matched filter, a polyphase filter, a time domain signal detector, a frequency domain signal detector and a frequency spectrum detector;
the analog low-pass filter is connected with one end of the linear amplifier, the other end of the linear amplifier is connected with the power divider, the power divider outputs two paths of signals, one path of signals is transmitted to the adjustable LOG amplifier, the output end of the adjustable LOG amplifier is connected with one end of the first filter, the other end of the first filter is connected with one end of the first analog-to-digital converter ADC, the other end of the first analog-to-digital converter ADC is connected with one end of the matched filter, the other end of the matched filter is connected with the time domain signal detector, and the final time domain signal detector is connected with the frequency spectrum detector; the other path of signal is sent to an adjustable linear amplifier, the output end of the adjustable linear amplifier is connected with one end of a second filter, the other end of the second filter is connected with one end of a second analog-to-digital converter ADC, the other end of the second analog-to-digital converter ADC is connected with one end of a multi-phase filter, the other end of the multi-phase filter is connected with a frequency domain signal detector, and finally the frequency domain signal detector is connected with a frequency spectrum detector; the spectrum detector is respectively connected with the adjustable LOG amplifier and the adjustable linear amplifier through signal lines.
2. An adaptive time-frequency domain receiver with spectrum sensing capability according to claim 1, characterized in that: the method comprises the steps of receiving radio frequency spectrum signals from an antenna, outputting the radio frequency spectrum signals to a power divider after passing through an analog low-pass filter and a linear amplifier, dividing the signals into two paths by the power divider, compressing the signals by an adjustable LOG amplifier, outputting the signals to a first analog-to-digital converter ADC to obtain digital domain signals, then passing through a matched filter, outputting the signals to a spectrum detector through a time domain signal detector, amplifying the signals by an adjustable linear amplifier, then passing through a filter, outputting the signals to a second analog-to-digital converter ADC to obtain digital domain signals, then passing through a polyphase filter, outputting the signals to a spectrum detector through a frequency domain signal detector, and connecting the signal energy of the spectrum detector to the adjustable LOG amplifier and the adjustable linear amplifier through signal wires to control the adjustable LOG amplifier and the adjustable linear amplifier.
3. A signal receiving method based on an adaptive time-frequency domain receiver with spectrum sensing capability as defined in claim 1, wherein: the method comprises the following steps:
1) Starting a time-frequency domain receiver to finish initialization of a linear amplifier, a LOG amplifier, an analog-to-digital converter ADC, a matched filter, a polyphase filter and a spectrum detector;
2) After the initialization is finished, the global spectrum environment sensing is started to be executed: the spectrum signal passes through a linear amplifier, a filter, an analog-to-digital converter ADC, a multi-phase filter and a frequency domain signal detector, the signal is transmitted to the spectrum detector to scan the spectrum signal, the gain value of the linear amplifier is adjusted to calculate global spectrum energy one by one, after N times of scanning, spectrum energy average value calculation is carried out, the calculated result is assigned to the LOG amplifier as a threshold level value, and the waiting state is carried out after the completion of the calculation;
3) After the global spectrum environment sensing is finished, the current aperiodic burst spectrum signal capturing is started to be executed: after receiving signals from an antenna, dividing the signals into two paths through a power divider, respectively transmitting the two paths to a frequency domain signal detector and a time domain signal detector, capturing and detecting burst signals, wherein the time domain signal detector receives signals larger than a threshold level value, and the frequency domain signal detector also receives current aperiodic spectrum burst signals; if the time domain signal detector does not receive a signal greater than the threshold level value, the global spectral energy continues to be received in a loop.
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