A subchannel preprocessing method, a preprocessing system and a channelized receiving system

Abstract

The application belongs to the technical field of wireless communication, and discloses a sub-channel preprocessing method, a preprocessing system and a channelized receiving system. The sub-channel preprocessing system comprises a photoelectric detection array, a detector, a processor and a matrix switch. The photoelectric detection array is used for beat frequency processing of optical signals of each sub-channel to obtain a set of radio frequency signals, and is also used for dividing each radio frequency signal in the set of radio frequency signals into two paths. The detector is used for obtaining one path signal of each radio frequency signal and performing power detection. The processor takes a sub-channel satisfying a preset power condition as an output channel according to a power detection result of the detector. The matrix switch is controlled by the processor to open the output channel, and outputs another path signal corresponding to the output channel. In summary, power optimization is used to realize selective output of sub-channels, thereby effectively releasing the processing capacity of empty channels and eliminating the redundancy of a digital processing structure.

Description

Technical Field

[0001] This invention belongs to the field of wireless communication technology, specifically relating to a sub-channel preprocessing method, a preprocessing system, and a channelized receiving system. Background Technology

[0002] Traditional channelized reception technology is based on multi-channel acquisition and processing technology of receiving arrays, which can improve the signal-to-noise ratio of signals through algorithms such as beamforming; however, the electronic bottleneck of signal processing in the traditional electrical domain and the electromagnetic interference resistance of the electrical domain structure have restricted the development of traditional channelized reception technology.

[0003] Microwave photonic channelized reception technology divides the signal to be received into multiple narrowbands by channelizing the signal in the frequency domain. This allows for parallel and real-time analog sensing reception of signals in different bands, thus bypassing the electronic bottlenecks encountered in traditional channelized reception. Furthermore, with the aid of digital signal processing, it significantly improves the dynamic range and real-time reception speed of radio frequency signals. However, in this overall reception process, channel equalization, system power consumption, and the size and cost of receiving equipment all increase with the number of channels. In particular, after completing the parallel reception of multiple narrowband signals, when digitally processing the signals received from multiple channels, there may be instances where a channel has no received signal but the digital processing continues. This not only leads to redundancy in the structure of the lower-level digital processing system but also results in a significant waste of digital computing power and power consumption. Summary of the Invention

[0004] In view of this, in order to solve the problems mentioned in the background art, the purpose of the present invention is to provide a sub-channel preprocessing method, a preprocessing system, and a channelized receiving system.

[0005] To achieve the above objectives, the present invention provides a sub-channel preprocessing method, comprising the following steps:

[0006] Beat frequency processing is performed on the optical signals of each sub-channel to obtain a radio frequency signal set;

[0007] Each radio frequency signal in the radio frequency signal set is divided into two paths;

[0008] By performing power detection on one of the radio frequency signals, the sub-channel that meets the preset power condition is taken as the output channel, and the other corresponding signal is output by the output channel.

[0009] Preferably, the sub-channel preprocessing method further includes: filtering and amplifying each radio frequency signal in the radio frequency signal set.

[0010] Furthermore, the radio frequency signals with a frequency range of 1.3 to 2.3 GHz are filtered and amplified.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] In the sub-channel preprocessing method of this invention, the radio frequency signal obtained by the beat frequency of the optical signal is divided into two signals for power detection and output. The signal quality of each sub-channel is screened through power detection, and the signal is selectively output based on the quality screening results. This ensures effective signal transmission while avoiding resource occupation of unsignaled channels, thereby freeing up the processing capacity of empty channels and eliminating redundancy in the digital processing structure. Furthermore, the radio frequency signal is filtered and amplified to improve the accuracy of power detection, thereby improving the accuracy of sub-channel selection.

[0013] To achieve the above objectives, the present invention also provides a sub-channel preprocessing system, comprising the following structure:

[0014] The photoelectric detection array is used to perform beat frequency processing on the optical signals of each sub-channel to obtain a radio frequency signal set, and is also used to divide each radio frequency signal in the radio frequency signal set into two paths;

[0015] A detector is used to acquire one of the radio frequency signals and perform power detection.

[0016] The processor uses the sub-channels that meet the preset power conditions as output channels based on the power detection results of the detector.

[0017] The matrix switch, controlled by the processor, activates the output channel and outputs another corresponding signal through the output channel.

[0018] Preferably, the photoelectric detection array includes multiple balanced detection modules that correspond one-to-one with each sub-channel, and each balanced detection module includes a photodetector, a filter, an amplifier, and a coupler connected in sequence.

[0019] The photodetector is used to perform beat frequency processing of optical signals and obtain corresponding radio frequency signals through photoelectric conversion;

[0020] The filter is used to perform filtering processing on the radio frequency signal;

[0021] The amplifier is used to perform amplification processing of the radio frequency signal;

[0022] The coupler is used to split the radio frequency signal into two paths, one for power detection and the other for output.

[0023] Furthermore, the filter and amplifier sequentially filter and amplify radio frequency signals within the frequency range of 1.3 to 2.3 GHz.

[0024] Furthermore, the coupler includes a coupling unit and a selective amplification unit connected in sequence.

[0025] Preferably, the detector includes multiple power detection modules that are connected one-to-one with the output side of each balanced detection module.

[0026] Preferably, the processor includes an analog-to-digital conversion module and a processing module connected in sequence.

[0027] The analog-to-digital converter is used to convert the analog level output by the detector into a digital signal;

[0028] The processing module sorts and filters the digital signals according to preset power conditions, and outputs control levels to the matrix switch based on the filtered digital signals.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] In the sub-channel preprocessing system of the present invention, the processing of sub-channel optical signals and the quality selection of sub-channels are completed by using a photoelectric detection array, detector, processor, matrix switch and other structures. The structure is simple and can effectively solve the problems of complex structure, large size and high cost of existing channelized receiving equipment.

[0031] To achieve the above objectives, the present invention also provides a channelized receiving system having the above-mentioned sub-channel preprocessing system.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The channelized receiving system of the present invention has the advantages of fast signal receiving and processing speed and low energy consumption. Attached Figure Description

[0034] Figure 1 This is a flowchart of the sub-channel preprocessing method of the present invention;

[0035] Figure 2 This is a schematic diagram of the sub-channel preprocessing system of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of a balanced detection module in the sub-channel preprocessing system of the present invention;

[0037] Figure 4 This is a schematic diagram of the matrix switch structure in the sub-channel preprocessing system of the present invention;

[0038] Figure 5The RF signal power detection diagram is shown for 10 sub-channels.

[0039] Figure 6 This is a diagram showing the channel on / off time detection when there are 10 sub-channels. Detailed Implementation

[0040] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Reference Figure 2 As shown, this invention provides a sub-channel preprocessing system, specifically including a photoelectric detection array, a detector, a processor, a matrix switch, and other structures. Wherein:

[0042] The aforementioned photoelectric detection array reference Figure 3 As shown, it specifically includes multiple balanced detection modules that correspond one-to-one with each sub-channel, and each balanced detection module includes a (BDX1BA) photodetector, a (BFCN-1801+) filter, a (NBB-400) amplifier and a (DCW-22-332+) coupler connected in sequence, wherein the coupler includes a coupling unit and a selective amplification unit connected in sequence.

[0043] The (LT5534) detector includes multiple power detection modules that are connected one-to-one with the output side of each balanced detection module;

[0044] The processor includes an analog-to-digital conversion module and a processing module connected in sequence. The analog-to-digital conversion module is composed of four AD7388 conversion chips, and the processing module is an STM32F407ZGT6 microcontroller.

[0045] The matrix switch reference Figure 4 As shown, it consists of multiple HMC596 switch chips, each with 4 inputs (VH, HH, HL, VL) and 2 outputs (OP1 and OP2), and the multiple switch chips are arranged in a tree structure.

[0046] Based on the sub-channel preprocessing system provided above, when specifically performing sub-channel preprocessing, refer to... Figure 1 The sub-channel preprocessing method shown herein forms the following processing steps:

[0047] S1. First, the (BDX1BA) photodetector in the photodetector array performs beat frequency processing on the optical signals of each sub-channel to obtain the radio frequency signal set.

[0048] S2. Filter radio frequency signals with frequencies between 1.3 and 2.3 GHz, and each radio frequency signal is filtered and amplified sequentially by the corresponding filter and amplifier.

[0049] S3. The coupler receives the amplified radio frequency signal and splits the corresponding radio frequency signal into two paths through the coupling unit. One path is used for power detection and the other path is used for output. The signal used for power detection continues to be amplified by the selective amplification unit.

[0050] S4. The amplified signal used for power detection is transmitted one-to-one to the power detection module of the detector to perform power detection on each signal, and the detected power is positively correlated with the signal quality of each sub-channel.

[0051] S5. The detection outputs of each power detection module are all analog levels. The analog level of the detector output is converted into a digital signal by the analog-to-digital converter of the processor. At the same time, the processing module sorts and filters the digital signals according to the preset power conditions. The sub-channel corresponding to the digital signal that meets the preset power conditions is used as the output channel. The control level is output to the matrix switch according to the filtered digital signal to control the opening of the output channel. The output channel outputs another output signal corresponding to it.

[0052] Based on the above preprocessing steps, please refer to the following for details. Figure 2 :

[0053] In this embodiment, the number of sub-channels is preferably set to 10, so that in the channelized receiving system, 10 sub-channels input 10 signal lights and 10 local oscillator lights to the photodetector, and the radio frequency signal set obtained after beat frequency processing corresponds to 10 radio frequency signals.

[0054] In this embodiment, the preset power condition is preferably set to the two digital signals with the highest corresponding power. Thus, the sub-channels (output channels) corresponding to the digital signals that satisfy the preset power condition are the two sub-channels with the highest corresponding power.

[0055] based on Figure 4 When the matrix switch shown is used to control the conduction of any two sub-channels, Figure 4 The preferred configuration includes 7 switch chips. Switches 1-4 form the first layer of a tree structure, creating a total of 16 input ports. Ten sub-channels are connected to any 10 of these input ports, thus connecting each sub-channel to the matrix switch. The specific switching control of each switch chip is executed according to the control level output by the processing module. The control level of a single switch chip can be referenced in the following level table:

[0056] In the table below, 0 represents low level and 1 represents high level.

[0057]

[0058] As shown above, assuming that the VL input port of switch 1 is connected to sub-channel 1, if it is necessary to output the signal within sub-channel 1, the control level output by the processing module should be 0000. Based on this, the processing module can accurately output the correct control level to the matrix switch according to the detection result of the power detection module.

[0059] In summary, this embodiment preferably selects the two sub-channels with the best signal quality from the 10 sub-channels and performs selective output, thereby realizing the sub-channel preprocessing of microwave photonic channelized reception technology. While ensuring effective signal transmission, it avoids the resource occupation of non-signal channels, thus effectively releasing the processing capacity of empty channels and eliminating the redundancy of digital processing structure.

[0060] In the aforementioned sub-channel preprocessing system and method with 10 sub-channels, the radio frequency signal obtained by the photodetector's beat frequency is amplified, filtered, and amplified again to ensure a high signal-to-noise ratio and signal power of the radio frequency signal in the channel. The signal is then directly split into two paths via a coupler: on one side, one radio frequency signal is amplified, amplified, and detected, resulting in a power-level mapping for power detection. The amplifier ensures detection accuracy and range, and... Figure 5 The RF signal power detection range shown is -70 to 0 dBm. On the other hand, switching the channel on / off of another RF signal is achieved by a microcontroller program processing the power-level mapping signal obtained through detection, calculating the signal power of 10 channels in descending order, selecting the two channels with the highest power, and simultaneously transmitting the corresponding control commands to the switching matrix to open these two channels and close the other channels. Figure 6 The switching time caused by the channel being turned on and off is less than 25µs, which effectively ensures the signal transmission speed.

[0061] In addition, the present invention also provides a channelized receiving system having the above-mentioned sub-channel preprocessing system.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sub-channel preprocessing method, characterized in that, Includes the following steps: Beat frequency processing is performed on the optical signals of each sub-channel to obtain a radio frequency signal set; Each radio frequency signal in the radio frequency signal set is divided into two paths; By performing power detection on one of the radio frequency signals, the sub-channel that meets the preset power condition is taken as the output channel, and the other corresponding signal is output by the output channel.

2. The sub-channel preprocessing method according to claim 1, characterized in that, It also includes the following steps: filtering and amplifying each radio frequency signal in the radio frequency signal set.

3. The sub-channel preprocessing method according to claim 2, characterized in that: The radio frequency signals with a concentrated frequency range of 1.3 to 2.3 GHz are filtered and amplified.

4. A sub-channel preprocessing system, characterized in that, include: The photoelectric detection array is used to perform beat frequency processing on the optical signals of each sub-channel to obtain a radio frequency signal set, and is also used to divide each radio frequency signal in the radio frequency signal set into two paths; A detector is used to acquire one of the radio frequency signals and perform power detection. The processor uses the sub-channels that meet the preset power conditions as output channels based on the power detection results of the detector. The matrix switch, controlled by the processor, activates the output channel and outputs another corresponding signal through the output channel.

5. The sub-channel preprocessing system according to claim 4, characterized in that: The photoelectric detection array includes multiple balanced detection modules that correspond one-to-one with each sub-channel, and each balanced detection module includes a photodetector, a filter, an amplifier and a coupler connected in sequence. The photodetector is used to perform beat frequency processing of optical signals and obtain corresponding radio frequency signals through photoelectric conversion; The filter is used to perform filtering processing on the radio frequency signal; The amplifier is used to perform amplification processing of the radio frequency signal; The coupler is used to split the radio frequency signal into two paths, one for power detection and the other for output.

6. The sub-channel preprocessing system according to claim 5, characterized in that: The filter and amplifier sequentially filter and amplify radio frequency signals with frequencies ranging from 1.3 to 2.3 GHz.

7. The sub-channel preprocessing system according to claim 5, characterized in that: The coupler includes a coupling unit and a selective amplification unit connected in sequence.

8. The sub-channel preprocessing system according to claim 5, characterized in that: The detector includes multiple power detection modules that are connected one-to-one with the output side of each balanced detection module.

9. The sub-channel preprocessing system according to claim 4, characterized in that: The processor includes an analog-to-digital conversion module and a processing module connected in sequence. The analog-to-digital converter is used to convert the analog level output by the detector into a digital signal; The processing module sorts and filters the digital signals according to preset power conditions, and outputs control levels to the matrix switch based on the filtered digital signals.

10. A channelized receiving system having the sub-channel preprocessing system as described in claim 9.

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