A method and apparatus for processing a received signal

Abstract

The application discloses a kind of processing methods of receiving signal, belong to electronic information communication technical field.Step includes: receiving signal is transformed to optical wave band, and forms optical carrier receiving signal;Optical carrier receiving signal is sent to dispersion medium, and optical carrier receiving signal disperses propagation in dispersion medium;Emission optical carrier receiving signal is collected, and it is demodulated and detected processing.The application also provides a kind of device for realizing the receiving signal processing method of the application.The method and device provided by the application can be applied to the separation extraction of different center frequency receiving signal, the separation of useful signal and interference signal, etc., can process the receiving signal of wired / wireless telecommunication signal, acoustic signal, optical signal, etc., and can be applied to communication, navigation, measurement and control, radar and other systems.

Description

Technical Field

[0001] This invention relates to the field of electronic information and communication technology, and in particular to a method and apparatus for processing received signals. Background Technology

[0002] Wireless / wired acoustic, optical, and electrical signals are widely used in communication, radar, telemetry, and reconnaissance systems. The processing of these received signals typically employs methods for electrical signal processing. However, within the same frequency band, when multiple signals with overlapping spectra exist, or when the spectra of useful signals and interfering signals overlap, traditional electrical signal processing methods struggle to separate and extract signals through filtering and other methods. This limits the signal demodulation and detection performance and anti-interference capabilities, making it a pressing challenge in the field of electronic information communication.

[0003] Taking communication systems as an example, a current technological trend to further improve spectrum utilization is to further reduce the center frequency interval between frequency-division multiplexing (FDM) signals, increase the spectral overlap between FDM signals, and ensure that the FDM signals no longer meet orthogonality requirements. In this situation, the demodulation and detection of signals becomes drastically more difficult, mainly due to two reasons: first, because there is no guard interval between signals of different frequencies, signals of different frequencies cannot be separated and extracted by filtering; second, because signals of different frequencies no longer possess orthogonality, FDM signals of different frequencies cannot be directly demodulated and detected based on orthogonality. Therefore, how to separate and extract individual FDM signals of different frequencies is a problem that urgently needs to be solved.

[0004] Light waves are a special type of electromagnetic wave with unique propagation characteristics, independent of the Fourier bandwidth of the optical signal. Optical signals with different center frequencies or wavelengths exhibit different refractive indices in a given dispersive medium. Utilizing this characteristic, the received signal is converted to the optical band, and by leveraging the dispersive properties of light, the desired signal can be extracted after propagation through dispersion. Further demodulation and detection processing can then improve system performance. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention provides a method and apparatus for processing received signals.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A method for processing received signals includes the following steps:

[0008] Step 1: Modulate the received signal to the optical band to form an optical carrier signal;

[0009] Step 2: The optical carrier signal is sent from the laser to a dispersive medium with high dispersion characteristics. The signal components with different center frequencies in the optical carrier signal are refracted at different angles in the dispersive medium. After propagation through the dispersive medium, the outgoing optical carrier signal is obtained.

[0010] Step 3: Collect the emitted optical carrier signal and perform demodulation and detection processing on it. The demodulation and detection processing can be optical domain demodulation and detection processing or joint optical-electric domain demodulation and detection processing.

[0011] Furthermore, when modulating the received signal into the optical band, a single-sideband suppressed carrier modulation method is used.

[0012] Since the dispersion process is independent of the Fourier bandwidth of the signal, it depends only on the center frequency or center wavelength of the signal. When the received signal is a frequency-division multiplexed signal, after the modulated optical carrier signal propagates through the dispersive medium, at a certain emission distance, signal components with different center frequencies in the optical carrier signal will be emitted to different spatial regions, corresponding to multiple independent optical carrier signals with different center frequencies. When the received signal is a composite received signal containing both useful and interference signals, after the modulated optical carrier signal propagates through the dispersive medium, at a certain emission distance, the useful and interference signals will be emitted to different spatial regions. The optical carrier signal in the useful signal region is selected for demodulation and detection.

[0013] Furthermore, in step 1, the received signal is first segmented and scaled in the time domain, and then the scaled received signal is modulated into the optical band. The scaling process refers to: for a segment of received signal with a time length of T, it is compressed in the time domain into a received signal with a time length of T / N, where the value of N is much greater than 1.

[0014] Furthermore, the light band mentioned refers to the ultraviolet light band.

[0015] Furthermore, the type of the received signal can be a radio signal, a wired signal, an acoustic signal, or an optical signal.

[0016] The present invention also discloses a signal processing device, including a signal receiving amplification module, an electro-optic modulation module, an optical dispersion module, and a demodulation detection module.

[0017] in:

[0018] The signal receiving and amplifying module is used to receive and amplify the received signal and convert the received signal into an electrical signal;

[0019] The electro-optic modulation module is used to modulate the electrical signal output from the signal receiving and amplifying module onto the optical band, output the optical carrier signal, and send it to the optical dispersion module.

[0020] An optical dispersion module, containing a dispersive medium such as a prism, is used to disperse and propagate optical signals, separating signal components with different center frequencies contained in the optical signal. Since signal components with different center frequencies have different refractive indices, the refraction propagation process will be biased at different angles. At a certain emission distance, signal components with different center frequencies will be emitted into different spatial regions.

[0021] The demodulation and detection module is used to demodulate and detect optical signals emitted to different spatial regions and recover the information carried in the signals. The demodulation and detection can be optical domain demodulation and detection or joint optical-electric domain demodulation and detection.

[0022] Furthermore, the receiving device also includes a time segmentation scaling module, located between the signal receiving amplification module and the electro-optic modulation module, for compressing a segment of received signal with a time length of T into a received signal with a time length of T / N in the time domain, where the value of N is much greater than 1.

[0023] Furthermore, the optical band mentioned in the electro-optic modulation module specifically refers to the ultraviolet light band.

[0024] The present invention also discloses an instrument or device for receiving signal detection, analysis, measurement, or testing, the instrument or device including the receiving signal processing method or apparatus provided by the present invention.

[0025] The present invention also discloses a computer-readable storage medium configured to store a program configured to perform the aforementioned method for processing a received signal.

[0026] Compared with the prior art, the present invention has the following technical effects:

[0027] (1) Traditional signal processing methods are difficult to demodulate and detect non-orthogonal frequency division multiplexing (NFD) signals with spectral aliasing. The signal processing method provided by this invention can first separate and extract all NFD signals from the received signal, and then perform individual or joint demodulation and detection processing. This can realize the separation, extraction and individual demodulation and detection of NFD signals with spectral aliasing, avoid interference between NFD signals, and effectively improve the demodulation and detection performance and bandwidth utilization of the communication system.

[0028] (2) For interference signals with intentional or unintentional spectral aliasing, the signal processing method provided by this invention can separate the useful signal from the interference signal to a certain extent, thus improving the anti-interference performance of the system, since the dispersion characteristics of the interference signal are not completely different from those of the useful signal. It should be noted that this application is not limited to communication systems, but can be applied to the reception and processing of radar, navigation, and other signals to improve the anti-interference capability of the corresponding systems. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments and drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic flowchart illustrating a method for processing received signals according to an embodiment of the present invention;

[0031] Figure 2 This invention provides a schematic diagram of the signal separation and extraction process of a received signal processing method in a real-time example.

[0032] Figure 3 This is a schematic diagram of the composition of a signal receiving processing device provided in an embodiment of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments and technical solutions obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] Example

[0035] Figure 1 This is a schematic flowchart illustrating a method for processing received signals according to an embodiment of the present invention. (Refer to...) Figure 1 The receiving and processing method includes: converting the received signal to the optical band; sending the converted optical carrier signal to the dispersive medium; acquiring the emitted optical carrier signal and performing demodulation and detection processing on it.

[0036] The received signal is a radio communication signal, denoted by r(t), where r(t) = r1(t) + r2(t), and r1(t) is a BPSK modulated signal with a center frequency of 1 GHz and a data rate of 50 Mb / s (bandwidth of 100 MHz), and r2(t) is a BPSK modulated signal with a center frequency of 1.025 GHz and a data rate of 50 Mb / s (bandwidth of 100 MHz). The receiving and processing procedure specifically includes the following steps:

[0037] Step 1. Convert the received signal r(t) to the optical band.

[0038] The received signal r(t) is divided into several segments with a duration of T = 1 millisecond, each segment containing 50,000 modulation symbols; N = 106 Each segment of the signal with a duration of T = 1 millisecond is scaled into a scaled segmented signal with a duration of T / N = 1 nanosecond. In the scaled segmented signal, r1(t) becomes a BPSK modulated signal with a center frequency of 1 THz and a bandwidth of 100 GHz, and r2(t) becomes a BPSK modulated signal with a center frequency of 1.025 THz and a bandwidth of 100 GHz.

[0039] A single-sideband suppressed carrier modulation method is used to transform each 1-nanosecond-long scaled segment signal into the 320nm ultraviolet band. The center frequency interval of r1(t) and r2(t) in the transformed optical carrier signal is 25GHz.

[0040] Step 2. Send the transformed optical carrier signal to the dispersive medium.

[0041] Using devices such as lasers, the ultraviolet light carrier signal generated in step 1 is sent at a certain angle into a glass dispersive medium, where it propagates and disperses. Because the center frequencies of the light carrier signals r1(t) and r2(t) are different (corresponding to different wavelengths), their refractive indices in the glass dispersive medium are different. Consequently, the propagation refraction angles of the two signals r1(t) and r2(t) in the glass dispersive medium are different. After a certain propagation distance, their spatial exit positions are different, thus achieving the separation and extraction of the spectral aliasing signal.

[0042] Step 3. Demodulate and detect the emitted optical carrier signal.

[0043] After the optical carrier signal is emitted, at a certain emission distance, r1(t) and r2(t) will form two spatially separated optical carrier signals. The two spatially separated optical carrier signals are collected, demodulated, detected and processed to recover the information carried in the signal.

[0044] It should be noted that in the original radio received signal r(t), since the center frequencies of r1(t) and r2(t) are 25MHz apart, and the bandwidths of both r1(t) and r2(t) are 100MHz, the spectra of the two signals overlap by 75MHz, resulting in a spectral overlap of 75%. Those skilled in the art should know that r1(t) and r2(t) in the received signal r(t) cannot be separated through filtering or refraction propagation. However, the received signal processing method provided by this invention can separate and extract the two signals r1(t) from the received signal r(t). Figure 2 This is a schematic diagram illustrating the signal separation and extraction process of a received signal processing method provided in real-time for the present invention.

[0045] It should be noted that this embodiment is only one embodiment of the signal processing method, and the given parameter values ​​are not intended to limit the present invention, but are only for the purpose of illustrating the embodiment of the invention.

[0046] Those skilled in the art will recognize that the method of this embodiment can be used to separate signals with any different center frequencies, and allows for a significant degree of aliasing between signal spectra. This method is not limited to the frequency division multiplexing signal reception processing described in this invention. For intentional or unintentional interference signals, the method provided by this invention can, to a certain extent, separate useful signals from interference signals, thereby suppressing interference and improving the signal-to-interference ratio.

[0047] Those skilled in the art will understand that the steps described in this embodiment are only a part of the complete method for processing received signals. A complete method for processing received signals may also include, but is not limited to, filtering, amplification, equalization, decoding, and decryption. For the sake of brevity, these will not be elaborated upon here. Any extensions, modifications, or improvements made to this embodiment based on this description are within the scope of protection of this invention.

[0048] Figure 3 This invention provides a schematic diagram of a signal processing device, comprising a signal receiving and amplification module, a time-segmentation scaling module, an electro-optic modulation module, an optical dispersion module, and a demodulation detection module. Specifically: ① The signal receiving and amplification module receives and amplifies the received signal, converting it into an electrical signal; ② The time-segmentation scaling module compresses a segment of the received signal with a time length of T into a received signal with a time length of T / N in the time domain, where N is much greater than 1; ③ The electro-optic modulation module modulates the electrical signal output from the signal receiving and amplification module to the optical frequency band, outputting an optical carrier signal and sending it to the optical dispersion module; ④ The optical dispersion module disperses the propagated optical carrier signal, separating signal components with different center frequencies contained in the optical carrier signal, so that at a certain emission distance, signal components with different center frequencies will be emitted to different spatial regions; ⑤ The demodulation detection module demodulates and detects the optical carrier signals emitted to different spatial regions, recovering the information carried in the signal.

[0049] Those skilled in the art should recognize that the functional modules included in the device can be configured as functional modules of the method process provided in the embodiments to implement the processing of received signals. For the sake of brevity, the configuration process of the functional modules will not be described further.

[0050] In embodiments of the present invention, an instrument or device for receiving signal detection, analysis, measurement, or testing is also provided, the instrument or device including the receiving signal processing method or apparatus provided by the present invention.

[0051] In an embodiment of the present invention, a computer-readable storage medium is also provided, which is configured to store a program configured to perform the methods of the above embodiments.

[0052] Those skilled in the art should recognize that, based on the technical solution provided in this embodiment, by modification and extension, it can be applied to the partial or complete separation of useful signals and interference or noise signals, thereby suppressing interference or noise and improving the signal-to-interference / noise ratio of the received signal.

[0053] Those skilled in the art should recognize that the technical solutions provided in this embodiment can be modified and extended to radar systems, wired communication systems, navigation systems, telemetry and control systems, acoustic systems, optical systems, etc., and these extensions and modifications are all within the scope of protection of this invention.

[0054] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0055] Those skilled in the art will recognize that the modules and method steps of the various examples described in conjunction with the embodiments disclosed in this invention can be implemented using analog circuits, digital processing chips, optoelectronic / electro-optical devices, software code, or a combination of all four. To clearly illustrate the interchangeability of analog circuits, digital processing chips, optoelectronic / electro-optical devices, and software code, the composition and steps of each example have been generally described in terms of functionality in the foregoing description. The specific manner in which these functions are performed depends on the particular application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0056] In the embodiments provided by this invention, it should be understood that the disclosed methods, apparatus, and devices can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modular units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modular units or components may be combined or integrated into another modular unit, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, or may be electrical, optical, or other forms of connection.

[0057] The module units described as separate components may or may not be physically separate. The components shown as module units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the module units can be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

[0058] Furthermore, in the various embodiments of the present invention, the functional units can be integrated into a single module unit, or each module unit can exist physically separately, or two or more module units can be integrated into a single module unit. The integrated module unit described above can be implemented using analog or digital optoelectronic hardware circuits, or it can be implemented using software functional units.

[0059] If the integrated module unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or digital processing chip to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes: USB flash drives, hard disks, portable hard disks, read-only memory (ROM), random access memory (RAM), cache memory, electrically programmable ROM (EPROM) memory, electrically erasable programmable ROM (EEPROM) memory, registers, flash memory, magnetic disks, or optical disks, and various other media capable of storing program code.

Claims

1. A method for processing received signals, characterized in that, Includes the following steps: Step 1: Modulate the received signal to the optical band to form an optical carrier signal; Step 2: The optical carrier signal is sent from the laser to a dispersive medium with high dispersion characteristics. The signal components with different center frequencies in the optical carrier signal are refracted at different angles in the dispersive medium. After propagation through the dispersive medium, the outgoing optical carrier signal is obtained. Step 3: Acquire the emitted optical carrier signal and perform demodulation and detection processing on it; When modulating the received signal to the optical band as described in step 1, a single-sideband suppressed carrier modulation method is used; The received signal is segmented and scaled in the time domain, and then the scaled received signal is modulated into the optical band. The scaling process refers to: for a segment of received signal with a time length of T, it is compressed in the time domain into a received signal with a time length of T / N, where the value of N is much greater than 1. The light band refers to the ultraviolet light band.

2. A signal processing device, characterized in that: It includes a signal receiving and amplification module, an electro-optic modulation module, an optical dispersion module, and a demodulation and detection module; in: The signal receiving and amplifying module is used to receive and amplify the received signal and convert the received signal into an electrical signal; The electro-optic modulation module is used to modulate the electrical signal output from the signal receiving and amplifying module onto the optical band, output the optical carrier signal, and send it to the optical dispersion module. An optical dispersion module, containing a dispersion medium, is used to disperse and propagate optical signals, separating signal components with different center frequencies contained in the optical signal. At a certain emission distance, the signal components with different center frequencies will be emitted to different spatial regions. The demodulation and detection module is used to demodulate and detect optical signals emitted to different spatial regions and recover the information carried in the signals. The receiving signal processing device further includes a time segmentation scaling module, located between the signal receiving amplification module and the electro-optic modulation module, for compressing a segment of the received signal with a time length of T into a received signal with a time length of T / N in the time domain, where the value of N is much greater than 1. The light band refers to the ultraviolet light band.

3. An instrument or apparatus for receiving, detecting, analyzing, or testing signals, characterized in that... The instrument or equipment includes the signal processing device as described in claim 2.

4. A computer-readable storage medium, characterized in that... A computer-readable storage medium is configured to store a program configured to perform the signal processing method as described in claim 1.

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