A method, system, device and medium for simultaneous calibration of multiple channels based on FDM

Abstract

The application relates to the technical field of low-orbit satellite communication, and discloses a multi-channel simultaneous calibration method, system, device and medium based on FDM. Through frequency division multiplexing and parallel processing mechanisms based on FDM, high-precision synchronous estimation and compensation of multi-channel amplitude, phase and delay parameters are realized, the inconsistency problem of channels in coaxial cable FDM transmission is effectively solved, the calibration efficiency and system transmission performance are significantly improved under the premise of ensuring that the amplitude error is not greater than 0.2 dB, the phase error is not greater than 2 degrees, and the delay error is lower than 0.01 sampling points, the calculation complexity and sequence overhead are reduced, and the calibration demand of a high-frequency wide multi-channel system such as a low-orbit satellite large phased array is met.

Description

Technical Field

[0001] This invention relates to the field of low-Earth orbit satellite communication technology, and in particular to a multi-channel simultaneous calibration method, system, device and medium based on FDM. Background Technology

[0002] Currently, in the field of low-Earth orbit satellite communication, high-speed serial communication interfaces are often used for data exchange between functional modules to meet the data transmission requirements of large-scale phased array antennas. However, this type of serial transmission method has a certain upper limit on transmission rate, making it difficult to meet the requirements of increasingly high-bandwidth, high-speed communication applications. To improve transmission capacity, frequency division multiplexing (FDM) technology based on coaxial cables can be used for data transmission. This solution can typically support transmission bandwidths up to 40 GHz, possessing the ability to cope with high bandwidth requirements.

[0003] However, using coaxial cable FDM multiplexing transmission also presents a series of technical challenges. Differences in manufacturing processes, material properties, and assembly of the RF modulator, demodulator, and cable itself introduce inconsistencies between channels, specifically deviations in amplitude, phase, and delay characteristics. These inconsistencies can lead to mismatches in the parallel transmission of multiple signals, thus affecting the overall system performance. Therefore, systematic calibration of the FDM multiplexing transmission channels is essential to ensure the accuracy and consistency of signal transmission. Summary of the Invention

[0004] This invention provides a multi-channel simultaneous calibration method, system, device, and medium based on FDM to overcome the shortcomings of existing technologies.

[0005] This invention provides a multi-channel simultaneous calibration method based on FDM, comprising:

[0006] The N original calibration signals transmitted by the transmitter are respectively subjected to FDM modulation to obtain N FDM modulated signals, and the N FDM modulated signals are transmitted to the receiver using a coaxial cable;

[0007] The N FDM modulated signals received at the receiving end are demodulated using FDM to obtain N frequency band signals;

[0008] Based on N original calibration signals and N frequency band signals, the data of parameters to be compensated are obtained using a pre-constructed N-channel model from the transmitter to the receiver. The parameters to be compensated include any one of the following or any combination thereof: channel delay, phase, and channel amplitude gain.

[0009] Based on the parameter data to be compensated, multi-channel simultaneous calibration of the transmitter or receiver can be achieved.

[0010] According to the multi-channel simultaneous calibration method based on FDM provided by the present invention, the transmitter is provided with N digital-to-analog converters, N quadrature modulators and a combiner;

[0011] The step of performing FDM modulation on the N original calibration signals transmitted by the transmitter to obtain N FDM modulated signals, and transmitting the N FDM modulated signals to the receiver via coaxial cable includes:

[0012] The N original calibration signals are converted into N analog signals by N digital-to-analog converters respectively;

[0013] N analog signals are FDM modulated by N quadrature modulators to obtain N FDM modulated signals.

[0014] The N FDM modulated signals are transmitted to the receiving end via coaxial cable using a combiner.

[0015] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein the N original calibration signals transmitted by the transmitter are respectively subjected to FDM modulation to obtain N FDM modulated signals, including:

[0016] According to the first expression, the N original calibration signals transmitted by the transmitter are respectively subjected to FDM modulation to obtain N FDM modulated signals, where the first expression is:

[0017] ,

[0018] In the formula, This represents an FDM modulated signal, indicating that... This represents the irrational number pi. This represents the nth original calibration signal. Represents the set of frequencies across all frequency bands. , Indicates signal bandwidth. and Let these represent the real and imaginary parts of the nth original calibration signal, respectively. Indicates time.

[0019] According to the multi-channel simultaneous calibration method based on FDM provided by the present invention, the receiver is equipped with N quadrature demodulators, N low-pass filters, N digital-to-analog converters and a main controller.

[0020] The step of demodulating the N FDM modulated signals received at the receiving end using FDM to obtain N frequency band signals includes:

[0021] The N FDM modulated signals are down-converted by N quadrature demodulators to obtain the I-channel signal and Q-channel signal of each channel.

[0022] The I-channel and Q-channel signals of each channel are accumulated by N low-pass filters to obtain the original signal of each channel.

[0023] The original N signals are sampled with anti-aliasing by N digital-to-analog converters to obtain N-channel frequency band signals.

[0024] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein N FDM modulated signals are down-converted by N orthogonal demodulators to obtain the I-channel signal and Q-channel signal of each channel, comprising:

[0025] According to the second expression, the N FDM modulated signals are down-converted using N quadrature demodulators to obtain I signals for each channel. The second expression is:

[0026]

[0027] =

[0028] + .

[0029] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein N FDM modulated signals are down-converted by N orthogonal demodulators to obtain the I-channel signal and Q-channel signal of each channel, comprising:

[0030] According to the third expression, the N FDM modulated signals are down-converted using N quadrature demodulators to obtain the Q-channel signal for each channel. The third expression is:

[0031]

[0032] =

[0033] + .

[0034] According to the multi-channel simultaneous calibration method based on FDM provided by the present invention, the expression of the channel model is as follows:

[0035] ,

[0036] In the formula, Indicates frequency band signal, Indicates the channel amplitude gain. Indicates phase, This represents the original calibration signal. Indicates channel delay.

[0037] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein the method obtains the parameter data to be compensated based on N original calibration signals and N frequency band signals, using a pre-constructed N-channel model from the transmitter to the receiver, including:

[0038] Based on a pre-constructed transmitter-to-receiver N-channel model, and using N original calibration signals and N frequency band signals, channel delay data is obtained using the fifth, sixth, and seventh expressions. The fifth expression is:

[0039] ,

[0040] The sixth expression is:

[0041] ,

[0042] The seventh expression is:

[0043] ,

[0044] In the formula, express Original calibration signal under time and frequency band signal The correlation function is used to find the maximum correlation point, which yields the correlation delay t1. h represents the channel coefficients, containing both amplitude and phase information of the channel. (The superscript indicates that h is the channel coefficient.) H Indicates conjugate transpose, superscript -1 It indicates the inverse.

[0045] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein the method obtains the parameter data to be compensated based on N original calibration signals and N frequency band signals, using a pre-constructed N-channel model from the transmitter to the receiver, including:

[0046] Based on a pre-constructed transmitter-to-receiver N-channel model, and using N original calibration signals and N frequency band signals, phase data is obtained using the eighth expression, where the eighth expression is:

[0047] ,

[0048] In the formula, This represents the phase of the channel coefficient h.

[0049] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein the method obtains the parameter data to be compensated based on N original calibration signals and N frequency band signals, using a pre-constructed N-channel model from the transmitter to the receiver, including:

[0050] Based on a pre-constructed transmitter-to-receiver N-channel model, and using N original calibration signals and N frequency band signals, the channel amplitude gain data is obtained using the ninth expression, where the ninth expression is:

[0051] ,

[0052] In the formula, This represents the channel amplitude gain of the channel coefficient h.

[0053] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein the multi-channel simultaneous calibration of the transmitter or receiver is performed based on the parameter data to be compensated, comprising:

[0054] Based on the parameter data to be compensated, a multi-channel simultaneous calibration expression for the transmitter is obtained, thus achieving multi-channel simultaneous calibration at the transmitter. The multi-channel simultaneous calibration expression for the transmitter is as follows:

[0055] ,

[0056] In the formula, Indicates the first The original calibration signal of each channel, Indicates the first Channel coefficients for each channel, Indicates the first The channel delay to be compensated for in each channel, Indicates time, Represents the impact response function. Indicates the first The signal after calibration of each channel.

[0057] According to the present invention, a multi-channel simultaneous calibration method based on FDM is provided, wherein the multi-channel simultaneous calibration of the transmitter or receiver is performed based on the parameter data to be compensated, comprising:

[0058] Based on the parameter data to be compensated, a multi-channel simultaneous calibration expression for the receiver is obtained, thereby achieving multi-channel simultaneous calibration at the receiver. The multi-channel simultaneous calibration expression for the receiver is as follows:

[0059] ,

[0060] In the formula, Indicates the first The frequency band signal of each channel, Indicates the first Channel coefficients for each channel, Indicates the first The channel delay to be compensated for in each channel, Indicates time, Represents the impact response function. Indicates the first The signal after calibration of each channel.

[0061] The present invention also provides a multi-channel simultaneous calibration system based on FDM, comprising:

[0062] The FDM modulation module is used to: perform FDM modulation on the N original calibration signals transmitted by the transmitter to obtain N FDM modulated signals, and transmit the N FDM modulated signals to the receiver via a coaxial cable;

[0063] The FDM demodulation module is used to demodulate the N FDM modulated signals received by the receiver to obtain N frequency band signals.

[0064] The digital processing module is used to: obtain the data of parameters to be compensated based on N original calibration signals and N frequency band signals, using a pre-constructed N channel model from the transmitter to the receiver. The parameters to be compensated include any one of the following or any combination thereof: channel delay, phase, and channel amplitude gain.

[0065] The multi-channel simultaneous calibration module is used to: perform simultaneous calibration of multiple channels at the transmitting or receiving end based on the parameter data to be compensated.

[0066] The present invention also provides an electronic device, including a processor and a memory storing a computer program, wherein the processor executes the computer program to implement any of the above-described FDM-based multi-channel simultaneous calibration methods.

[0067] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described FDM-based multi-channel simultaneous calibration methods.

[0068] The present invention also provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer is able to execute any of the above-described FDM-based multi-channel simultaneous calibration methods.

[0069] The present invention provides a multi-channel simultaneous calibration method, system, device, and medium based on FDM, which has at least the following beneficial effects:

[0070] By using FDM frequency division multiplexing technology, multiple calibration signals can be transmitted simultaneously on a single coaxial cable. The frequency band isolation characteristics are used to achieve parallel estimation and compensation of each channel without interference, which significantly improves the efficiency of multi-channel calibration in large-scale phased array systems.

[0071] It can accurately estimate and compensate for inconsistencies in amplitude, phase and delay among channels. The compensation accuracy can be set to ensure that the amplitude error does not exceed 0.2dB, the phase error does not exceed 2 degrees and the delay error is less than 0.01 sampling points, thereby effectively ensuring the consistency of signal transmission and improving the overall communication quality of the system.

[0072] It supports the use of the same calibration sequence for channel estimation in different frequency bands, which not only simplifies the signal generation and processing structure, but also significantly reduces computational complexity and hardware resource overhead while ensuring calibration accuracy by optimizing the sequence length, making it suitable for application scenarios with high real-time requirements.

[0073] With a clear structure, it is easy to integrate into existing FDM transmission systems and can be widely used in fields with high bandwidth and multi-channel requirements, such as low-orbit satellite communication, providing an effective calibration solution for reliable data transmission of large-scale phased array antennas. Attached Figure Description

[0074] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0075] Figure 1 This is a flowchart illustrating a multi-channel simultaneous calibration method based on FDM provided by the present invention.

[0076] Figure 2 This illustrates the overall architecture for data transmission using coaxial cables in a large-scale phased array payload, where module A interacts with module B via a coaxial cable for broadband data exchange.

[0077] Figure 3 This illustrates the principle of quadrature modulation and demodulation.

[0078] Figure 4 The FDM modulation process is shown.

[0079] Figure 5 The FDM demodulation process is shown.

[0080] Figure 6 The channel estimation process is shown.

[0081] Figure 7 This is a schematic diagram of a multi-channel simultaneous calibration system based on FDM provided by the present invention.

[0082] Figure 8 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0083] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. In the description of this invention, it should be understood that the terminology used is for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0084] Figure 1 This is a flowchart illustrating a multi-channel simultaneous calibration method based on FDM provided by the present invention. The executing entity of the multi-channel simultaneous calibration method based on FDM provided by the present invention can be any applicable terminal-side device or network-side device, such as an FDM-based multi-channel simultaneous calibration device.

[0085] See Figure 1 The present invention provides a multi-channel simultaneous calibration method based on FDM, which may include:

[0086] S110. Perform FDM modulation on the N original calibration signals transmitted by the transmitter to obtain N FDM modulated signals, and transmit the N FDM modulated signals to the receiver using a coaxial cable.

[0087] In one embodiment, the transmitting end is provided with N digital-to-analog converters, N quadrature modulators, and a combiner. S110 may include:

[0088] The N original calibration signals are converted into N analog signals by N digital-to-analog converters respectively;

[0089] N analog signals are FDM modulated by N quadrature modulators to obtain N FDM modulated signals.

[0090] The N FDM modulated signals are transmitted to the receiving end via coaxial cable using a combiner.

[0091] See Figure 2 Module A (transmitter) can transmit N modulated signals (original calibration signals) occupying different frequency bands, S1…S N When in calibration mode, since the frequency bands do not interfere with each other, the original calibration signal is first converted into an analog signal by each DAC, then modulated onto different carrier frequencies by each quadrature modulator, and finally sent out through a combiner to achieve FDM modulation (e.g., Figure 3 and 4(As shown). S110 can achieve FDM modulation through the first expression, where the first expression is:

[0092] ,

[0093] In the formula, This represents an FDM modulated signal, indicating that... This represents the irrational number pi. This represents the nth original calibration signal. This represents the set of frequencies across all frequency bands, with guard intervals required between bands. , Indicates signal bandwidth to prevent inter-frequency crosstalk. and Let these represent the real and imaginary parts of the nth original calibration signal, respectively. Indicates time. Assuming a wideband signal with a transmission sampling rate of 61.44MHz and a bandwidth of 40MHz, the modulated signal is obtained after multiplex FDM modulation. .

[0094] S120. Perform FDM demodulation on the N FDM modulated signals received by the receiving end to obtain N frequency band signals.

[0095] In one embodiment, the receiving end is provided with N quadrature demodulators, N low-pass filters, N digital-to-analog converters, and a main controller. S120 may include:

[0096] The N FDM modulated signals are down-converted by N quadrature demodulators to obtain the I-channel signal and Q-channel signal of each channel (the I-channel signal and Q-channel signal are two down-converted quadrature signals).

[0097] The I-channel and Q-channel signals of each path are accumulated using N low-pass filters to obtain the original signal of each path. ;

[0098] The original N signals are sampled with anti-aliasing by N digital-to-analog converters to obtain N-channel frequency band signals.

[0099] See Figure 2 In module B, based on FDM multi-channel coherent demodulation (such as...) Figure 3 and 5 As shown), a coherent demodulator is used to down-convert the intermediate frequency signal in each channel. According to the second expression, N orthogonal demodulators are used to down-convert the N FDM modulated signals to obtain I signals for each channel. The second expression is:

[0100]

[0101] =

[0102] + .

[0103] According to the third expression, the N FDM modulated signals are down-converted using N quadrature demodulators to obtain the Q-channel signal for each channel. The third expression is:

[0104]

[0105] =

[0106] + .

[0107] S130. Based on the N original calibration signals and N frequency band signals, the N channel models from the transmitter to the receiver are used to obtain the data of the parameters to be compensated. The parameters to be compensated include any one of the following or any combination thereof: channel delay, phase, and channel amplitude gain.

[0108] In one embodiment, the expression for the channel model is:

[0109] ,

[0110] In the formula, Indicates frequency band signal, Indicates the channel amplitude gain. Indicates phase, This represents the original calibration signal. This represents channel delay, measured in sample points.

[0111] Since the channel characteristics traversed in each frequency band are different, the FDM demodulated signals of each frequency band are correlated with the original calibration signal to obtain the channel amplitude, phase, and time delay information in different frequency bands. The obtained channel information can be used for channel compensation, circuit characteristic analysis, and other applications.

[0112] In one embodiment, see Figure 6 S130 may include:

[0113] Based on a pre-constructed N-channel model from transmitter to receiver, and using N original calibration signals and N frequency band signals, channel delay data is obtained using the fifth, sixth, and seventh expressions. Here, assuming a certain transmitted signal is x and the received signal is y, the fifth expression is:

[0114] ,

[0115] The sixth expression is:

[0116] ,

[0117] The seventh expression is:

[0118] ,

[0119] In the formula, express Original calibration signal under time and frequency band signal By finding the correlation function and the maximum correlation point, the correlation delay t1 can be obtained. Then, the x delay... Then, the LS algorithm (least squares algorithm) is used to calculate the channel coefficients h, where h represents the channel coefficients and contains the amplitude and phase information of the channel. H Indicates conjugate transpose, superscript -1 It indicates the inverse.

[0120] Based on a pre-constructed transmitter-to-receiver N-channel model, and using N original calibration signals and N frequency band signals, phase data is obtained using the eighth expression, where the eighth expression is:

[0121] ,

[0122] In the formula, This represents the phase of the channel coefficient h.

[0123] Based on a pre-constructed transmitter-to-receiver N-channel model, and using N original calibration signals and N frequency band signals, the channel amplitude gain data is obtained using the ninth expression, where the ninth expression is:

[0124] ,

[0125] In the formula, This represents the channel amplitude gain of the channel coefficient h.

[0126] The delay resolution of the parameters to be compensated for each signal can also be improved through oversampling interpolation. The calculated parameters to be compensated for multiple signals can be used for correction at the transmitting or receiving end.

[0127] S140. Based on the parameter data to be compensated, perform simultaneous calibration of multiple channels at the transmitting or receiving end.

[0128] In one embodiment, S140 may include:

[0129] Based on the parameter data to be compensated, a multi-channel simultaneous calibration expression for the transmitter is obtained, thus achieving multi-channel simultaneous calibration at the transmitter. The multi-channel simultaneous calibration expression for the transmitter is as follows:

[0130] ,

[0131] In the formula, Indicates the first The original calibration signal of each channel, Indicates the first Channel coefficients for each channel, Indicates the first The channel delay to be compensated for in each channel, Indicates time, Represents the impact response function. Indicates the first The signal after calibration of each channel.

[0132] In one embodiment, S140 may include:

[0133] Based on the parameter data to be compensated, a multi-channel simultaneous calibration expression for the receiver is obtained, thereby achieving multi-channel simultaneous calibration at the receiver. The multi-channel simultaneous calibration expression for the receiver is as follows:

[0134] ,

[0135] In the formula, Indicates the first The frequency band signal of each channel, Indicates the first Channel coefficients for each channel, Indicates the first The channel delay to be compensated for in each channel, Indicates time, Represents the impact response function. Indicates the first The signal after calibration of each channel.

[0136] The subscript n indicates which channel. After transmission calibration, combining the multi-channel simultaneous calibration expression used at the transmitter and the first expression, the transmitted signals of each channel are first... After calibration The calibrated signals are then modulated using FDM to obtain the calibrated modulated signals. Similarly, during receiver calibration, based on the second and third expressions, and after passing through the LPF, an uncalibrated IQ complex signal is obtained. Various signals Based on the multi-channel simultaneous calibration expression used at the receiver, the calibration signals of each channel can be obtained. .

[0137] based on Figure 2In terms of architecture, Module A can use a ZC sequence with good autocorrelation and poor cross-correlation to transmit calibration signals. Since guard intervals are inserted between multiple frequency bands, the calibration signals do not interfere with each other. Therefore, multi-band multiplexing calibration generally only requires transmitting a single ZC sequence. For example, if the maximum transmission frequency of a single frequency band is 40MHz, and the guard interval is set to 5MHz, the actual number of sub-bands used can be flexibly selected according to the actual transmission bandwidth requirements and the upper limit of coaxial cable transmission. During calibration, multiple channels simultaneously transmit a single ZC sequence. These multiple signals are then converted into analog signals after FDM modulation and transmitted through coaxial cables.

[0138] At the receiving end, after FDM demodulation and digital sampling, multiple received digital signals are obtained. After coherent demodulation, the signals undergo ADC anti-aliasing sampling. Taking a 40MHz bandwidth signal with 5MHz guard intervals on both sides as an example, the ADC sampling rate can be 45MHz. This needs to be correlated with the original transmitted calibration signal to calculate the channel parameters of different frequency band transmission channels. The original transmitted calibration signal is stored in the main control unit, where relevant calculations are performed to obtain the channel amplitude, phase, and delay information in different frequency bands. Based on the amplitude, phase, and delay information of each channel in each frequency band calculated by the main control unit, corresponding compensation can be performed in Module B. During service execution, the compensated signal is distributed to each subarray module.

[0139] The multi-channel synchronous calibration method based on FDM provided by this invention has the following advantages:

[0140] By employing the FDM frequency division multiplexing mechanism, multiple calibration signals can be transmitted in parallel in a single coaxial cable. By utilizing frequency band isolation, independent parallel estimation and compensation of multiple channels can be achieved, which greatly improves the calibration efficiency of large-scale phased array antenna systems.

[0141] It can accurately estimate and compensate for the differences in amplitude, phase and time delay between channels, with compensation accuracy of amplitude error ≤0.2 dB, phase error ≤2° and time delay error <0.01 sampling interval, thereby significantly enhancing signal transmission consistency and improving the overall communication performance of the system.

[0142] It allows the same calibration sequence to be reused in different frequency bands for channel estimation, which simplifies the transmission and reception processing structure and can effectively reduce computational complexity and hardware resource consumption by optimizing the sequence length, making it suitable for applications with high real-time requirements.

[0143] The solution has a clear architecture and is easy to implement. It can be easily integrated into existing FDM transmission systems and is widely applicable to high-bandwidth, multi-channel scenarios such as low-orbit satellite communication, providing an efficient calibration solution for reliable data transmission of large phased array antennas.

[0144] The FDM-based multi-channel simultaneous calibration system provided by the present invention is described below. The FDM-based multi-channel simultaneous calibration system described below can be referred to in correspondence with the FDM-based multi-channel simultaneous calibration method described above.

[0145] See Figure 7 The present invention provides a multi-channel simultaneous calibration system based on FDM, which may include:

[0146] The FDM modulation module is used to: perform FDM modulation on the N original calibration signals transmitted by the transmitter to obtain N FDM modulated signals, and transmit the N FDM modulated signals to the receiver via a coaxial cable;

[0147] The FDM demodulation module is used to demodulate the N FDM modulated signals received by the receiver to obtain N frequency band signals.

[0148] The digital processing module is used to: obtain the data of parameters to be compensated based on N original calibration signals and N frequency band signals, using a pre-constructed N channel model from the transmitter to the receiver. The parameters to be compensated include any one of the following or any combination thereof: channel delay, phase, and channel amplitude gain.

[0149] The multi-channel simultaneous calibration module is used to: perform simultaneous calibration of multiple channels at the transmitting or receiving end based on the parameter data to be compensated.

[0150] Figure 8 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 8 As shown, the electronic device may include a processor 810, a communications interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communications interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions in the memory 830 to execute the following steps:

[0151] The N original calibration signals transmitted by the transmitter are respectively subjected to FDM modulation to obtain N FDM modulated signals, and the N FDM modulated signals are transmitted to the receiver using a coaxial cable;

[0152] The N FDM modulated signals received at the receiving end are demodulated using FDM to obtain N frequency band signals;

[0153] Based on N original calibration signals and N frequency band signals, the data of parameters to be compensated are obtained using a pre-constructed N-channel model from the transmitter to the receiver. The parameters to be compensated include any one of the following or any combination thereof: channel delay, phase, and channel amplitude gain.

[0154] Based on the parameter data to be compensated, multi-channel simultaneous calibration of the transmitter or receiver can be achieved.

[0155] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer 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.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0156] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer is able to perform the following steps:

[0157] The N original calibration signals transmitted by the transmitter are respectively subjected to FDM modulation to obtain N FDM modulated signals, and the N FDM modulated signals are transmitted to the receiver using a coaxial cable;

[0158] The N FDM modulated signals received at the receiving end are demodulated using FDM to obtain N frequency band signals;

[0159] Based on N original calibration signals and N frequency band signals, the data of parameters to be compensated are obtained using a pre-constructed N-channel model from the transmitter to the receiver. The parameters to be compensated include any one of the following or any combination thereof: channel delay, phase, and channel amplitude gain.

[0160] Based on the parameter data to be compensated, multi-channel simultaneous calibration of the transmitter or receiver can be achieved.

[0161] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0162] The N original calibration signals transmitted by the transmitter are respectively subjected to FDM modulation to obtain N FDM modulated signals, and the N FDM modulated signals are transmitted to the receiver using a coaxial cable;

[0163] The N FDM modulated signals received at the receiving end are demodulated using FDM to obtain N frequency band signals;

[0164] Based on N original calibration signals and N frequency band signals, the data of parameters to be compensated are obtained using a pre-constructed N-channel model from the transmitter to the receiver. The parameters to be compensated include any one of the following or any combination thereof: channel delay, phase, and channel amplitude gain.

[0165] Based on the parameter data to be compensated, multi-channel simultaneous calibration of the transmitter or receiver can be achieved.

[0166] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0167] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simultaneous calibration of multiple channels based on FDM, characterized in that, The method comprises the following steps: FDM modulating N original calibration signals transmitted by the transmitting end respectively to obtain N FDM modulated signals, and transmitting the N FDM modulated signals to the receiving end by using a coaxial cable; FDM demodulating N FDM modulated signals received by the receiving end respectively to obtain N frequency band signals; According to the N original calibration signals and the N frequency band signals, using the pre-constructed N channel models from the transmitting end to the receiving end, obtaining the to-be-compensated parameter data, wherein the to-be-compensated parameters include any one or any combination of the following: channel delay, phase, channel amplitude gain; According to the to-be-compensated parameter data, realizing multi-channel simultaneous calibration of the transmitting end or the receiving end; The expression of the channel model is: ， wherein represents a band signal, represents a channel amplitude gain, represents a phase, represents an original calibration signal, represents a channel delay; According to the N original calibration signals and the N frequency band signals, using the pre-constructed N channel models from the transmitting end to the receiving end, obtaining the to-be-compensated parameter data, comprising: Based on the pre-constructed N channel models from the transmitting end to the receiving end, according to the N original calibration signals and the N frequency band signals, using the fifth expression, the sixth expression and the seventh expression, obtaining the channel delay data, wherein the fifth expression is: ， The sixth expression is: ， The seventh expression is: ， wherein denotes the original calibration signal and the band signals the correlation function, the maximum correlation point is found, i.e. the correlation delay t1is obtained, h denotes the channel coefficients, h contains the amplitude and phase information of the channel, the superscript H denotes the conjugate transpose, the superscript -1 denotes the inverse; According to the N original calibration signals and the N frequency band signals, using the pre-constructed N channel models from the transmitting end to the receiving end, obtaining the to-be-compensated parameter data, comprising: Based on the pre-constructed N channel models from the transmitting end to the receiving end, according to the N original calibration signals and the N frequency band signals, using the eighth expression, obtaining the phase data, wherein the eighth expression is: ， In the formula, denotes the phase of the channel coefficient h; According to the N original calibration signals and the N frequency band signals, using the pre-constructed N channel models from the transmitting end to the receiving end, obtaining the to-be-compensated parameter data, comprising: Based on the pre-constructed N channel models from the transmitting end to the receiving end, according to the N original calibration signals and the N frequency band signals, using the ninth expression, obtaining the channel amplitude gain data, wherein the ninth expression is: ， In the formula, denotes the channel amplitude gain of the channel coefficients h.

2. The FDM-based multi-channel simultaneous calibration method of claim 1, wherein, The transmitting end is provided with N digital-to-analog converters, N quadrature modulators and one combiner; The method comprises the following steps: Converting the N original calibration signals into N analog signals through the N digital-to-analog converters respectively; FDM modulating the N analog signals through the N quadrature modulators respectively to obtain the N FDM modulated signals; Transmitting the N FDM modulated signals to the receiving end by using a coaxial cable through the one combiner.

3. The FDM-based multi-channel simultaneous calibration method of claim 2, wherein, The method comprises the following steps: FDM modulating the N original calibration signals transmitted by the transmitting end respectively according to the first expression to obtain the N FDM modulated signals, wherein the first expression is: ， wherein denotes the FDM modulated signal, denotes denotes the irrational number of pi, denotes the nth raw calibration signal, denotes the frequency set of all frequency bands, , denotes the signal bandwidth, and denotes the real part and the imaginary part of the nth raw calibration signal, respectively, denotes the time.

4. The FDM-based multi-channel simultaneous calibration method of claim 3, wherein, The receiving end is provided with N quadrature demodulators, N low-pass filters, N digital-to-analog converters and one master control, The method comprises the following steps: Down-convert each of the N FDM modulated signals by N quadrature demodulators to obtain an I signal and a Q signal of each of the N FDM modulated signals; Accumulate the I signal and the Q signal of each of the N FDM modulated signals by N low-pass filters to obtain an original signal of each of the N FDM modulated signals; Anti-alias sample the N original signals by N digital-to-analog converters to obtain N band signals.

5. The FDM-based multi-channel simultaneous calibration method of claim 4, wherein, The down-converting each of the N FDM modulated signals by N quadrature demodulators to obtain an I signal of each of the N FDM modulated signals comprises: According to a second expression, down-convert each of the N FDM modulated signals by N quadrature demodulators to obtain an I signal of each of the N FDM modulated signals, wherein the second expression is: = + ； According to a third expression, down-convert each of the N FDM modulated signals by N quadrature demodulators to obtain a Q signal of each of the N FDM modulated signals, wherein the third expression is: = + 。 6. The FDM-based multi-channel simultaneous calibration method of claim 1, wherein, The implementing the multi-channel simultaneous calibration of the transmitting end or the receiving end according to the to-be-compensated parameter data comprises: According to the to-be-compensated parameter data, obtaining a multi-channel simultaneous calibration expression for the transmitting end to implement the multi-channel simultaneous calibration of the transmitting end, wherein the multi-channel simultaneous calibration expression for the transmitting end is: ， wherein represents the original calibration signal of the channel, represents the channel coefficient of the channel, represents the channel delay to be compensated of the channel, represents time, represents the impulse response function, represents the calibrated signal of the channel. The implementing the multi-channel simultaneous calibration of the transmitting end or the receiving end according to the to-be-compensated parameter data comprises: According to the to-be-compensated parameter data, obtaining a multi-channel simultaneous calibration expression for the receiving end to implement the multi-channel simultaneous calibration of the receiving end, wherein the multi-channel simultaneous calibration expression for the receiving end is: ， wherein represents a frequency band signal of the th channel, represents a channel coefficient of the th channel, represents a channel delay to be compensated of the th channel, represents time, represents an impulse response function, represents a signal after calibration of the th channel.

7. A multi-channel simultaneous calibration system based on FDM, characterized in that, Comprise: The FDM modulation module is configured to: modulate N original calibration signals transmitted by a transmitting end by FDM respectively to obtain N FDM modulated signals, and transmit the N FDM modulated signals to a receiving end by using a coaxial cable; The FDM demodulation module is configured to: demodulate N FDM modulated signals received by the receiving end by FDM respectively to obtain N band signals; The digital processing module is configured to: according to the N original calibration signals and the N band signals, obtain to-be-compensated parameter data by using N pre-constructed channel models from the transmitting end to the receiving end, wherein the to-be-compensated parameters comprise any one or any combination of the following: channel delay, phase, channel amplitude gain; The multi-channel simultaneous calibration module is configured to: according to the to-be-compensated parameter data, implement the multi-channel simultaneous calibration of the transmitting end or the receiving end. The expression of the channel model is: ， wherein represents a band signal, represents a channel amplitude gain, represents a phase, represents an original calibration signal, represents a channel delay; The obtaining, according to the N original calibration signals and the N band signals, to-be-compensated parameter data by using N pre-constructed channel models from the transmitting end to the receiving end comprises: According to the N original calibration signals and the N band signals, obtain channel delay data by using a fifth expression, a sixth expression and a seventh expression based on the N pre-constructed channel models from the transmitting end to the receiving end, wherein the fifth expression is: ， The sixth expression is: ， The seventh expression is: ， wherein denotes the original calibration signal and the band signal The correlation function of the original calibration signal H denotes the conjugate transpose, and the superscript -1 denotes the inverse; The obtaining, according to the N original calibration signals and the N band signals, to-be-compensated parameter data by using N pre-constructed channel models from the transmitting end to the receiving end comprises: Based on the pre-constructed N-channel model from the transmitting end to the receiving end, according to the N original calibration signals and the N band signals, phase data is obtained by using an eighth expression, wherein the eighth expression is: ， In the formula, denotes the phase of the channel coefficient h; The method further comprises: obtaining the to-be-compensated parameter data according to the N original calibration signals and the N band signals by using the pre-constructed N-channel model from the transmitting end to the receiving end. Based on the pre-constructed N-channel model from the transmitting end to the receiving end, according to the N original calibration signals and the N band signals, channel amplitude gain data is obtained by using a ninth expression, wherein the ninth expression is: ， In the formula, denotes the channel amplitude gain of the channel coefficients h.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the FDM-based multi-channel simultaneous calibration method according to any one of claims 1 to 6. 9.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the FDM-based multi-channel simultaneous calibration method according to any one of claims 1 to 6.

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