CN110380749B - Single-channel radio frequency anti-saturation device, method and system - Google Patents
Single-channel radio frequency anti-saturation device, method and system Download PDFInfo
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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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
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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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
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Abstract
The application relates to a single-channel radio frequency anti-saturation device, a method and a system thereof. The device comprises: the optical-electrical conversion module is used for receiving a radio-frequency input signal and converting the radio-frequency input signal into an optical signal, the optical branching module is used for dividing the optical signal into a plurality of paths of synchronous optical signals, the optical fiber delay module is used for respectively carrying out multi-path transmission on the plurality of paths of synchronous optical signals to generate a plurality of paths of delay optical signals with different delays relative to the synchronous optical signals, the optical-electrical conversion module is used for converting the plurality of paths of delay optical signals into a plurality of paths of delay electrical signals, and the algorithm processing module is used for carrying out iterative calculation on the plurality of paths of delay electrical signals through a self-adaptive filtering algorithm to obtain an optimal weight value to weight the delay electrical signals. By adopting the method, the radio frequency single channel can resist saturation.
Description
Technical Field
The present application relates to the field of radio frequency technologies, and in particular, to a single-channel radio frequency anti-saturation apparatus, method, and system.
Background
At present, the anti-saturation technology of the receiving end mainly realizes anti-saturation through an Automatic Gain Control (AGC) circuit. The AGC is used for controlling the gain, so that the state of low gain or large attenuation can be kept, the saturation phenomenon of a subsequent circuit due to strong interference is avoided, and the scheme is widely applied at present. However, although the anti-saturation scheme of AGC can ensure that the receiver does not generate saturation phenomenon, it has the same suppression effect on interference and useful signals, and the actual useful signals cannot be utilized at all because the gain is too small.
Disclosure of Invention
In view of the foregoing, there is a need to provide a single-channel rf anti-saturation apparatus, method and system capable of solving the problem of suppressing a useful signal caused by anti-saturation interference in the prior art.
A single channel radio frequency anti-saturation apparatus, the apparatus comprising:
the electro-optical conversion module is used for receiving a radio frequency input signal and converting the radio frequency input signal into an optical signal;
the optical branching module is used for dividing the optical signal into a plurality of paths of synchronous optical signals;
the optical fiber delay module is used for respectively carrying out multi-path transmission on the multi-path synchronous optical signals to generate a plurality of paths of delay optical signals with different delays relative to the synchronous optical signals;
the photoelectric conversion module is used for converting the multi-path time delay optical signal into a multi-path time delay electric signal;
and the algorithm processing module is used for carrying out iterative calculation on the multi-path time delay electric signals through a self-adaptive filtering algorithm to obtain the optimal weight value to weight the time delay electric signals and outputting the weighted time delay electric signals at radio frequency.
In one embodiment, the method further comprises the following steps: the electro-optical conversion module includes: lasers and electro-optic modulators; and generating a light source with a preset wavelength by the laser, receiving a radio frequency input signal by the electro-optic modulator, and carrying out carrier modulation on the radio frequency input signal according to the light source to generate the optical signal.
In one embodiment, the method further comprises the following steps: the optical fiber delay module comprises a plurality of optical fibers with different lengths; and the multipath synchronous optical signals are transmitted in the optical fibers with different lengths, and multipath time-delay optical signals with different time delays relative to the synchronous optical signals are generated.
In one embodiment, the method further comprises the following steps: the optical fibers with different lengths are all single-mode optical fibers.
In one embodiment, the method further comprises the following steps: the algorithm processing module comprises: a magnitude-phase weighting unit and an algorithm unit; the amplitude-phase weighting is used for respectively adjusting the amplitude and the phase of the multi-path time delay electric signals to obtain multi-path algorithm input signals; inputting the multi-path algorithm input signals into the algorithm unit, and performing iterative computation on the input multi-path algorithm input signals through a self-adaptive filtering algorithm by the algorithm unit to output the optimal weight of the optimal amplitude-phase weighting unit; and setting parameters of the amplitude and phase weighting unit through the optimal weight.
In one embodiment, the method further comprises the following steps: the algorithm processing unit carries out iterative computation through a least mean square adaptive filtering algorithm.
In one embodiment, the method further comprises the following steps: the electro-optical conversion module, the optical branching module, the optical fiber delay module and the photoelectric conversion module are realized through optical fiber delay lines.
In one embodiment, the method further comprises the following steps: a band-pass filter; the band-pass filter is used for performing band-pass filtering on the algorithm input signal.
A single channel radio frequency anti-saturation method, the method comprising:
converting a radio frequency input signal into a plurality of paths of synchronous optical signals;
respectively carrying out multi-path transmission on the multi-path synchronous optical signals to obtain a plurality of paths of time delay optical signals with different time delays relative to the synchronous optical signals;
converting the time delay optical signal into a time delay electrical signal, inputting the multi-path time delay electrical signal into a preset adaptive filtering algorithm for iterative computation, and obtaining an optimal weight value corresponding to the time delay electrical signal;
and weighting the time delay electric signal according to the optimal weight value, and outputting radio frequency.
A single channel radio frequency anti-saturation system, comprising:
the input unit is used for converting the radio frequency input signal into a plurality of paths of synchronous optical signals;
the time delay generating unit is used for respectively carrying out multi-path transmission on the multi-path synchronous optical signals to obtain a plurality of paths of time delay optical signals with different time delays relative to the synchronous optical signals;
the iteration unit is used for converting the time delay optical signal into a time delay electrical signal, inputting the multi-path time delay electrical signal into a preset adaptive filtering algorithm for iterative computation, and obtaining an optimal weight value corresponding to the time delay electrical signal;
and the radio frequency unit is used for weighting the time delay electric signal according to the optimal weight value and outputting radio frequency.
According to the single-channel radio frequency anti-saturation device, the method and the system, at the transmitting end, the electric signals are converted into the optical signals, the optical signals are divided into the multiple paths of optical signals and transmitted in different channels to generate the optical signals with different time delays, then the optical signals are converted into the electric signals, the time delays are reflected on the phases of the electric signals, the optimal weight values are calculated in a self-adaptive mode through the different phases, the electric signals are weighted by the optimal weight values, and because the input electric signals are used as reference signals during iteration, the gain of high-power interference signals can be restrained, the distortion attenuation of useful signals is reduced, and the signal-to-interference ratio of the system can be improved while anti-saturation is achieved.
Drawings
FIG. 1 is a schematic block diagram of a single channel RF anti-saturation device in one embodiment;
FIG. 2 is a schematic block diagram of a single channel RF anti-saturation device in another embodiment;
FIG. 3 is a diagram illustrating an exemplary algorithm processing module configured to perform the processing according to an embodiment;
FIG. 4 is a flow diagram of a single channel RF anti-saturation method in one embodiment;
FIG. 5 is a block diagram of a single channel RF anti-saturation system in one embodiment;
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a single channel radio frequency anti-saturation device, comprising:
the electrical-to-optical conversion module 110 is configured to receive a radio frequency input signal and convert the radio frequency input signal into an optical signal. Since the transmitting end receives a wireless signal through the antenna and receives the wireless signal internally in the form of an electrical signal, the electro-optical conversion module 110 may be used for electro-optical conversion.
The optical splitting module 120 is configured to convert the optical signal into multiple synchronous optical signals. The synchronous optical signal means that the intensity, frequency, wavelength, etc. of each optical signal are equal, and the reason why the embodiment converts the electrical signal into the optical signal for transmission is that the loss of the optical signal is small and the time delay is easy to occur during the transmission. It is worth to be noted that, the specific division into several paths of synchronous optical signals can be set according to requirements, and the more the divided synchronous optical signals are, the stronger the anti-interference capability is, which also results in large calculation amount and slow system response.
The optical fiber delay module 130 is configured to perform multiplexing transmission on the multiple synchronous optical signals, and generate multiple delay optical signals with different time delays relative to the synchronous optical signals. The synchronous optical signal may be selected from different media such as twisted pair, coaxial cable, optical fiber, etc. By multiplexing, time-delayed optical signals of different time delays can be generated.
The photoelectric conversion module 140 is configured to convert the multi-path time-delay optical signal into a multi-path time-delay electrical signal. The optical signals are converted into the electric signals, so that a mathematical expression of the signals is conveniently constructed, and mathematical calculation is further facilitated.
And the algorithm processing module 150 is configured to perform iterative computation on the multiple paths of time delay electrical signals through a self-adaptive filtering algorithm to obtain an optimal weight value, weight the time delay electrical signals, and output the weighted time delay electrical signals at a radio frequency. The adaptive filtering algorithm can be selected from an LMS adaptive filtering algorithm, an NLMS adaptive filtering algorithm and the like.
In the single-channel radio frequency anti-saturation device, at the transmitting end, the electrical signal is converted into the optical signal, the optical signal is divided into multiple paths of optical signals, the optical signals with different time delays are transmitted in different channels, the optical signals with different time delays are generated and then converted into the electrical signal, the time delays are reflected on the phase positions of the electrical signals, through the difference of the phase positions, an adaptive filtering algorithm is adopted, the optimal weight value is calculated in a self-adaptive mode, the electrical signals are weighted by the optimal weight value, the input electrical signal is taken as a reference signal when iteration is carried out, the gain of high-power interference signals can be restrained, meanwhile, the distortion attenuation of useful signals is reduced, and the signal-to-interference ratio of a system can be improved while the anti-saturation is realized.
In one embodiment, an electro-optic conversion module includes: the laser and the electro-optical modulator generate a light source with a preset wavelength through the laser, the electro-optical modulator receives a radio frequency input signal, and the carrier modulation is carried out on the radio frequency input signal according to the light source to generate an optical signal. This embodiment provides a specific implementation of the photoelectric conversion module, and through the same light source, it can be ensured that optical signals have a uniform wavelength when the carrier is modulated.
Specifically, the laser can be a DFB butterfly laser with a rate of 10Gbps and can generate a light source with the wavelength of 1550nm, and the electro-optical modulator can be an OCLARO electro-optical modulator with the model F10.
In one embodiment, the optical fiber is selected as the transmission medium of the synchronous optical signal, so that each path of synchronous optical signal is transmitted through the optical fibers with different lengths, and the transmission distance of the optical signal can be greatly increased due to the fact that the light is transmitted in the optical fiber in a refraction mode, and high delay is easily realized.
Specifically, when only two paths of synchronous optical signals are provided, the length of the optical fiber of one path is set to be 0, that is, the synchronous optical signals are directly sent to the photoelectric conversion module, and the length of the optical fiber of the other path is set to be 4 meters, so that the delay of 13.3ns can be realized.
In another embodiment, the optical fibers are single-mode optical fibers, so that single-channel radio frequency anti-saturation interference can be realized.
In a specific embodiment, as shown in fig. 2, a specific single-channel rf anti-saturation apparatus is provided, in fig. 2, an electro-optical modulator 111 receives an rf input signal, a laser 112 provides a light source, the electro-optical modulator 111 performs carrier modulation on the rf input signal according to the light source to obtain an optical signal, the optical splitting module 120 may select an optical splitter 121, which is illustrated as an example of a 1 × 2 optical splitter, and may also select an optical splitter of another specification, and an optical transmission medium selects an optical fiber, so that the optical fiber delay module 130 includes two optical fibers with different lengths, which are an optical fiber 131 and an optical fiber 132, and the photoelectric conversion module 140 includes a photodetector 141 and a photodetector 142, and further includes an algorithm processing module 150.
In one embodiment, the optical fiber delay line has the advantages of large time bandwidth product, high frequency, good linearity, small insertion loss, no electromagnetic interference and the like, and can directly receive a radio frequency input signal and output an electrical signal with time delay, so that the electro-optical conversion module, the optical branching module, the optical fiber delay module and the photoelectric conversion module can be realized by the optical fiber delay line.
In one embodiment, the algorithm processing module comprises an amplitude-phase weighting module and an algorithm unit, wherein the amplitude-phase weighting module adjusts the amplitude and the phase of the multi-path time delay electric signals respectively to obtain multi-path algorithm input signals. The multi-path algorithm input signal is input into the algorithm unit, and the algorithm unit carries out iterative computation on the input multi-path algorithm input signal through a self-adaptive filtering algorithm and outputs the optimal weight of the optimal amplitude-phase weighting unit. And setting parameters of the amplitude and phase weighting unit through the optimal weight. In this embodiment, the input delay electrical signal is weighted by the optimal weight, so as to achieve the anti-saturation effect.
Specifically, as shown in fig. 3, a schematic structure diagram of an adaptive filtering algorithm is provided, where a symbol W refers to a magnitude-phase weighting subunit in a magnitude-phase weighting unit, a time-delay electrical signal is input to the magnitude-phase weighting subunit, a weighted signal is output, an error value is calculated by an algorithm unit through an adaptive algorithm, and through iteration until iteration stops, weight updating of the magnitude-phase weighting subunit is completed, so as to obtain an optimal weight.
In addition, X1The process of performing delay processing on the radio frequency input signal is shown in the above embodiments, and is not described again in the drawings, and is represented by delay. In addition, n optical fibers exist in the figure, namely, the optical signals are divided into n pathsAnd the step optical signal is also provided with n amplitude-phase weighting subunits which are used for carrying out amplitude-phase weighting processing on the n paths of synchronous optical signals respectively.
In one embodiment, the algorithm unit performs the iterative computation by a least mean square adaptive filtering algorithm. The Least Mean Square adaptive filtering algorithm is also called LMS (Least Mean Square) algorithm, and the processing procedure of the LMS algorithm is as follows:
and (3) filtering output: y (n) ═ w (n) · x (n)
Error signal: e (n) ═ d (n) — y (n)
Updating the weight coefficient: w (n +1) ═ w (n) — 2 · μ · e (n) · x (n)
Where y (n) refers to the rf output signal, w (n) refers to the weight of the nth amplitude-phase weighting subunit, and w (n +1) refers to the weight of the (n +1) th amplitude-phase weighting subunit, it is noted that although there are only n amplitude-phase weighting subunits in this embodiment, w (n +1) may select the first amplitude-phase weighting subunit according to the time sequence of the delay. Mu refers to a global step size parameter, and in order to realize convergence of the LMS algorithm, 0 < mu < 1/lambda max is generally used, wherein lambda max corresponds to the maximum eigenvalue of the eigenvalue decomposition of the correlation matrix of the input time delay electrical signal of the amplitude-phase weighting subunit. d (n) refers to a reference signal, and it can be known from fig. 3 that d (n) represents a radio frequency input signal.
Through the above analysis, for example, if the iterative condition is satisfied at e (n), the weight coefficient is updated to w (n +1), and the first amplitude-phase weighting subunit is assigned according to w (n +1), so that the signal output by the first amplitude-phase weighting subunit is used as the radio frequency output signal.
It should be noted that the weight of the amplitude-phase weighting subunit is an imaginary number, and is expressed in the form of ww ═ a | ejbAnd assigning the amplitude-phase weighting subunit, namely updating the values of a and b.
It is worth to be noted that the amplitude and phase weighting unit can be implemented by a programmable attenuator and a programmable phase shifter in hardware, and the algorithm unit can be implemented by writing codes of the LMS algorithm into a microprocessor chip such as an FPGA or a DSP.
In another embodiment, the single-channel radio frequency anti-saturation device for two optical fiber channels can only resist one interference signal, and by analogy, the single-channel radio frequency anti-saturation device for n optical fiber channels can resist n-1 interference signals.
In addition, when performing anti-interference processing, the number of interference signals and the number of channels need to be matched, for example, for two channels of optical fiber channels, only one optical fiber signal can be processed, so that other interference signals need to be filtered, only one interference signal is processed, specifically, a bandpass filter is provided, the center frequency of the bandpass filter and the frequency of a useful signal are one, and then bandwidth adjustment is performed, so that only one interference signal exists in a bandwidth spectrum.
In this embodiment, if there are a plurality of channels, a wider bandwidth can be set when setting the bandwidth of the band pass filter.
Based on the single-channel radio frequency anti-saturation device, the single-channel radio frequency anti-saturation method is provided, the single-channel radio frequency anti-saturation device can be realized through simulation software in a computer, each component in the single-channel radio frequency anti-saturation device is simulated in the simulation software, and then the single-channel radio frequency anti-saturation method is realized through computer program control.
In one embodiment, as shown in fig. 4, a single-channel rf anti-saturation method is provided, for example, when the method is implemented in a computer device, comprising the steps of:
And step 408, weighting the time delay electric signal according to the optimal weight value, and outputting the radio frequency.
It should be noted that the single-channel radio-frequency anti-saturation method corresponds to a single-channel radio-frequency anti-saturation device, and when each module in the single-channel radio-frequency anti-saturation device is changed, the single-channel radio-frequency anti-saturation method is changed accordingly, so that the single-channel radio-frequency anti-saturation method caused by the change of each module in the single-channel radio-frequency anti-saturation device in the above embodiment is not described herein again.
It should be understood that, although the steps in the flowchart of fig. 4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 5, a schematic block diagram of a single-channel rf anti-saturation system is provided, including: an input unit 502, a delay generation unit 504, an iteration unit 506 and a radio frequency unit 508.
An input unit 502, configured to convert a radio frequency input signal into multiple synchronous optical signals;
a time delay generating unit 504, configured to perform multiplexing transmission on the multiple channels of synchronous optical signals, respectively, to obtain multiple channels of time delay optical signals with different time delays relative to the synchronous optical signals;
an iteration unit 506, configured to convert the time-delay optical signal into a time-delay electrical signal, and input the multiple paths of time-delay electrical signals into a preset adaptive filtering algorithm for iterative computation, so as to obtain an optimal weight corresponding to the time-delay electrical signal;
and the radio frequency unit 508 is configured to weight the time delay electrical signal according to the optimal weight value, and perform radio frequency output.
For specific limitations of the single-channel rf anti-saturation system, reference may be made to the above limitations of the single-channel rf anti-saturation method, which are not described herein again. The modules in the single-channel radio frequency anti-saturation system can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A single channel radio frequency anti-saturation apparatus, the apparatus comprising:
the electro-optical conversion module is used for receiving a radio frequency input signal and converting the radio frequency input signal into an optical signal;
the optical branching module is used for dividing the optical signal into a plurality of paths of synchronous optical signals;
the optical fiber delay module is used for respectively carrying out multi-path transmission on the multi-path synchronous optical signals to generate a plurality of paths of delay optical signals with different delays relative to the synchronous optical signals;
the photoelectric conversion module is used for converting the multi-path time delay optical signal into a multi-path time delay electric signal;
and the algorithm processing module is used for carrying out iterative calculation on the multi-path time delay electric signals through a self-adaptive filtering algorithm to obtain optimal weight values, weighting the time delay electric signals according to the optimal weight values and outputting the time delay electric signals at radio frequency.
2. The apparatus of claim 1, wherein the electro-optic conversion module comprises: lasers and electro-optic modulators;
and generating a light source with a preset wavelength by the laser, receiving a radio frequency input signal by the electro-optic modulator, and carrying out carrier modulation on the radio frequency input signal according to the light source to generate the optical signal.
3. The apparatus of claim 1, wherein the fiber delay module comprises a plurality of optical fibers of different lengths;
and the multipath synchronous optical signals are transmitted in the optical fibers with different lengths, and multipath time-delay optical signals with different time delays relative to the synchronous optical signals are generated.
4. The apparatus of claim 3, wherein the plurality of different lengths of optical fiber are each single mode optical fibers.
5. The apparatus of claim 1, wherein the algorithm processing module comprises: a magnitude-phase weighting unit and an algorithm unit;
the amplitude and phase weighting unit respectively adjusts the amplitude and the phase of the multi-path time delay electric signal to obtain a multi-path algorithm input signal;
inputting the multi-path algorithm input signals into the algorithm unit, and performing iterative computation on the input multi-path algorithm input signals through a self-adaptive filtering algorithm by the algorithm unit to output the optimal weight of the optimal amplitude-phase weighting unit;
and setting parameters of the amplitude and phase weighting unit through the optimal weight.
6. The apparatus according to any one of claims 1 to 5, wherein the algorithm processing unit performs iterative computation by a least mean square adaptive filtering algorithm.
7. The apparatus of any one of claims 1 to 5, wherein the electro-optical conversion module, the optical branching module, the optical fiber delay module, and the optical-to-electrical conversion module are implemented by optical fiber delay lines.
8. The apparatus of claim 5, further comprising: a band-pass filter;
the band-pass filter is used for performing band-pass filtering on the algorithm input signal.
9. A single channel radio frequency anti-saturation method, the method comprising:
converting a radio frequency input signal into a plurality of paths of synchronous optical signals;
respectively carrying out multi-path transmission on the multi-path synchronous optical signals to obtain a plurality of paths of time delay optical signals with different time delays relative to the synchronous optical signals;
converting the time delay optical signal into a time delay electrical signal, inputting the multi-path time delay electrical signal into a preset adaptive filtering algorithm for iterative computation, and obtaining an optimal weight value corresponding to the time delay electrical signal;
and weighting the time delay electric signal according to the optimal weight value, and outputting radio frequency.
10. A single channel radio frequency anti-saturation system, comprising:
the input unit is used for converting the radio frequency input signal into a plurality of paths of synchronous optical signals;
the time delay generating unit is used for respectively carrying out multi-path transmission on the multi-path synchronous optical signals to obtain a plurality of paths of time delay optical signals with different time delays relative to the synchronous optical signals;
the iteration unit is used for converting the time delay optical signal into a time delay electrical signal, inputting the multi-path time delay electrical signal into a preset adaptive filtering algorithm for iterative computation, and obtaining an optimal weight value corresponding to the time delay electrical signal;
and the radio frequency unit is used for weighting the time delay electric signal according to the optimal weight value and outputting radio frequency.
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| CN101807903A (en) * | 2010-03-26 | 2010-08-18 | 深圳市云海通讯股份有限公司 | Self-adapting filter, filtration method and repeater |
| CN102281044B (en) * | 2010-06-12 | 2016-07-20 | 澜起科技（上海）有限公司 | Blind adaptive filtering device and the application thereof of arrowband interference can be eliminated |
| CN102394592A (en) * | 2011-10-18 | 2012-03-28 | 北京理工大学 | Adaptive filter based on Backlash operator |
| CN204143008U (en) * | 2014-11-05 | 2015-02-04 | 西安方元明科技发展有限公司 | Fibre delay line |
| CN108494498A (en) * | 2018-02-09 | 2018-09-04 | 大连理工大学 | A kind of adaptive anti-multichannel interference photon radio-frequency receiving front-end and method |
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