Multi-user uplink polarization signal processing method and device in large digital phased array

Abstract

The application provides a multi-user uplink polarized signal processing method and device in a large digital phased array, which comprises the following steps: acquiring signals of user terminals received by two digital receiving channels of each antenna in N antennas of the digital phased array, each digital receiving channel corresponding to a polarized direction, N being a positive integer greater than or equal to 2; performing digital beam synthesis on signals of each user terminal in each polarized direction according to signals received by N digital receiving channels in each polarized direction; determining combining coefficients of signals in each polarized direction of each user terminal according to channel estimation of signals in each polarized direction of each user terminal; and combining digital beam synthesized signals in two polarized directions of each user terminal according to the combining coefficients of signals in the two polarized directions of each user terminal to obtain combined signals. The application significantly improves the polarization matching loss problem of circularly polarized satellite reception.

Description

Technical Field

[0001] This invention relates to the field of signal processing technology, and in particular to a method and apparatus for multi-user uplink polarization signal processing in a large digital phased array. Background Technology

[0002] In the construction of global mobile direct-connect satellite internet, to solve the problem of direct satellite connection for a massive number of existing terminals, linearly polarized transmitting antennas are typically used in the uplink path of these terminals. However, after electromagnetic signals pass through the ionosphere, the polarization direction of linear polarization rotates. Therefore, satellite receiving antennas are usually designed to be circularly polarized to accommodate different linear polarization directions. But circularly polarized receiving lines naturally have polarization loss. When the axis ratio of the satellite's circularly polarized antenna is poor, the polarization loss will increase significantly, further affecting the uplink received power. A key issue to be addressed in satellite communication is the path loss caused by long distances, and polarization loss further exacerbates the overall path loss.

[0003] Large digital phased arrays are widely recognized in satellite communications due to their high transmit and receive gains, which effectively compensate for path loss in air-to-ground communication. However, even after the high gain of the phased array compensates for path loss, the signal-to-noise ratio margin in air-to-ground communication is still insufficient. Therefore, the problem caused by polarization matching loss remains an urgent issue to be addressed.

[0004] Each satellite carries at least one large phased array antenna, and one antenna will communicate with multiple users on the ground. The polarization directions of the signals from these multiple users are likely to be different, so how to achieve polarization matching for each user is also a problem that needs to be solved.

[0005] Therefore, the polarization loss problem of uplink polarization signals for multiple users in large digital phased arrays is a very urgent problem that needs to be solved. Summary of the Invention

[0006] This invention provides a method and apparatus for processing multi-user uplink polarization signals in a large digital phased array, which solves the defect of polarization matching loss in the uplink polarization signals of multiple users in the prior art, and significantly improves the polarization matching loss problem of circular polarization satellite reception.

[0007] This invention provides a method for processing multi-user uplink polarization signals in a large digital phased array, comprising:

[0008] To obtain the user terminal signal received by the two digital receiving paths of each of the N antennas in a digital phased array, where each digital receiving path corresponds to a polarization direction and N is a positive integer greater than or equal to 2;

[0009] Based on the signals received by N digital receiving channels for each polarization direction, digital beamforming is performed on the signals for each polarization direction at each user terminal;

[0010] Based on the channel estimation of the signal in each polarization direction at each user terminal, the combining coefficient of the signal in each polarization direction at each user terminal is determined. Based on the combining coefficient of the signal in both polarization directions at each user terminal, the digital beamforming signals in both polarization directions at each user terminal are combined to obtain the combined signal.

[0011] According to the present invention, a multi-user uplink polarization signal processing method in a large digital phased array is provided. The combined signal is obtained by merging the digitally beamformed signals from the two polarization directions at each user end using the following formula based on the combining coefficients of the signals from the two polarization directions at each user end:

[0012]

[0013] in, S The combined signal, h The signal is digitally beamformed in the horizontal polarization direction at the user end. v The signal synthesized by digital beamforming in the vertical polarization direction of the user terminal. and Corresponding to h and v Channel estimation, and Corresponding to and The conjugate of complex numbers.

[0014] According to the present invention, a multi-user uplink polarization signal processing method in a large digital phased array further includes, after acquiring the user terminal signals received by the two digital receiving paths of each of the N antennas in the digital phased array:

[0015] The signals received by the user terminal from the two digital receiving paths of each antenna are converted from time-domain signals to frequency-domain signals.

[0016] According to the present invention, a multi-user uplink polarization signal processing method in a large digital phased array is provided, which combines the signals synthesized by digital beamforming in the two polarization directions at each user end to obtain a combined signal based on the combining coefficient of the signals in the two polarization directions at each user end, including:

[0017] The optimal combination coefficient pair is obtained by optimizing the combination coefficients of the signals in the two polarization directions of each user terminal to minimize the EVM of the combined signal.

[0018] Based on the optimal combining coefficient pairs corresponding to each user terminal, the signals synthesized by digital beamforming in the two polarization directions of each user terminal are combined to obtain the combined signal.

[0019] According to the present invention, a multi-user uplink polarization signal processing method in a large digital phased array optimizes the combining coefficient pairs formed by the combining coefficients of signals in two polarization directions at each user end, so as to minimize the EVM of the combined signal and obtain the optimal combining coefficient pair, including:

[0020] Exchange and / or change the combining coefficients in at least one polarization direction between the combining coefficient pairs corresponding to each user terminal within a preset range to obtain new combining coefficient pairs for each user terminal.

[0021] Based on the new combining coefficients of each user terminal, the signals synthesized by digital beamforming in the two polarization directions of each user terminal are combined to obtain a new combined signal.

[0022] Calculate the EVM of the new combined signal and the original combined signal at each user terminal, and take the combined coefficient pair corresponding to the combined signal with the smallest EVM as the optimal combined coefficient pair.

[0023] According to the present invention, a multi-user uplink polarization signal processing method in a large digital phased array involves exchanging and / or changing the combining coefficients in at least one polarization direction between the combining coefficient pairs corresponding to each user terminal within a preset amplitude range to obtain new combining coefficient pairs for each user terminal, including:

[0024] Construct a set of the combination coefficient pairs corresponding to the smallest preset number of EVMs in the EVMs of the combined signals generated from all user-end combination coefficient pairs.

[0025] Select the two combining coefficient pairs with the smallest EVM from the set, and exchange the combining coefficients in at least one polarization direction between the two combining coefficient pairs to form a first new combining coefficient pair. Add the first new combining coefficient pair to the set if a preset condition is met.

[0026] If the first new combining coefficient pair does not meet the preset conditions, two combining coefficient pairs are randomly selected from the set, and the combining coefficients in at least one polarization direction between the two randomly selected combining coefficient pairs are exchanged to form a second new combining coefficient pair. The second new combining coefficient pair is added to the set if the preset conditions are met.

[0027] If the second new combining coefficient pair does not meet the preset conditions, a combining coefficient pair is randomly selected from the set, and the combining coefficient of at least one signal in at least one polarization direction is randomly changed within a preset amplitude range to form a third new combining coefficient pair. The third new combining coefficient pair is added to the set if the preset conditions are met.

[0028] If the third new combination coefficient pair does not meet the preset conditions, continue to iterate the above steps on the current set until the preset number of iterations is reached.

[0029] According to the present invention, a method for processing multi-user uplink polarization signals in a large digital phased array is provided, wherein the preset condition is that the ratio between the EVM of the combined signal corresponding to the second new combining coefficient pair or the third new combining coefficient pair and the maximum value of the EVM of the combined signal corresponding to the combining coefficient pair in the current set is less than a preset ratio.

[0030] According to the present invention, a multi-user uplink polarization signal processing method in a large digital phased array, when the third new combiner coefficient pair does not meet the preset conditions, continues to iteratively execute the above steps on the current set until a preset number of iterations is reached, including:

[0031] If the third new combining coefficient pair does not meet the preset conditions, and if the number of combining coefficient pairs in the set is greater than the preset number, then delete the multiple combining coefficient pairs with the largest EVM of the corresponding combined signal from the set, so that the number of combining coefficient pairs in the set is less than or equal to the preset number.

[0032] Repeat the above steps for the deleted set until the preset number of iterations is reached.

[0033] The present invention also provides a multi-user uplink polarization signal processing device in a large digital phased array, comprising:

[0034] The acquisition module is used to acquire the user terminal signals received by the two digital receiving paths of each of the N antennas in the digital phased array. Each digital receiving path corresponds to a polarization direction, and N is a positive integer greater than or equal to 2.

[0035] The synthesis module is used to perform digital beamforming on the signals of each user terminal in each polarization direction based on the signals received by N digital receiving channels in each polarization direction.

[0036] The merging module is used to determine the combining coefficient of the signal in each polarization direction of each user terminal based on the channel estimation of the signal in each polarization direction of each user terminal, and to merge the digital beamformed signals in the two polarization directions of each user terminal based on the combining coefficient of the signal in the two polarization directions of each user terminal to obtain the combined signal.

[0037] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the multi-user uplink polarization signal processing method in a large digital phased array as described above.

[0038] 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 the multi-user uplink polarization signal processing method in a large digital phased array as described above.

[0039] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the multi-user uplink polarization signal processing method in a large digital phased array as described above.

[0040] The present invention provides a method and apparatus for multi-user uplink polarization signal processing in a large digital phased array. By performing digital beamforming on the signals received by N digital receiving paths for each polarization direction at each user end, the synthesized signal has an effective and distinguishable signal-to-noise ratio, achieving high gain performance of the large digital phased array. The combined signal is then merged using the combining coefficients obtained from the channel estimation of the signals for each polarization direction at each user end, and the combining coefficients are optimized to achieve the optimal EVM of the synthesized signal, significantly improving the polarization matching loss problem in circularly polarized satellite reception. Attached Figure Description

[0041] 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.

[0042] Figure 1 This is a flowchart illustrating the multi-user uplink polarization signal processing method in a large digital phased array provided by the present invention.

[0043] Figure 2 This is a schematic diagram of the framework structure of the multi-user uplink polarization signal processing method in a large digital phased array provided by the present invention;

[0044] Figure 3 This is a flowchart illustrating the optimization of the combining coefficient in the multi-user uplink polarization signal processing method for large digital phased arrays provided by the present invention.

[0045] Figure 4 This is a schematic diagram of the structure of the multi-user uplink polarization signal processing device in a large digital phased array provided by the present invention;

[0046] Figure 5 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0047] 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, of the embodiments of this 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.

[0048] The following is combined with Figure 1 This invention describes a method for processing multi-user uplink polarization signals in a large digital phased array, comprising:

[0049] Step 101: Obtain the user terminal signal received by the two digital receiving paths of each of the N antennas in the digital phased array. Each digital receiving path corresponds to a polarization direction, and N is a positive integer greater than or equal to 2.

[0050] In a large digital phased array, each antenna is connected to two orthogonal digital receiving paths, corresponding to the V-polarization direction and the H-polarization direction, respectively. Assuming a large digital phased array has N antennas, there are 2*N digital receiving paths, with N paths corresponding to one polarization direction and the other N paths corresponding to the other polarization direction.

[0051] like Figure 2 As shown, each antenna has two digital receiving paths that receive signals from one user terminal. For example, the two orthogonal paths 1 of the first antenna receive signals from user 1, and the two orthogonal paths N of the Nth antenna receive signals from user m.

[0052] Step 102: Based on the signals received by the N digital receiving channels for each polarization direction, perform digital beamforming on the signals for each polarization direction at each user terminal.

[0053] Since large digital phased arrays must first achieve high gain performance, the signals received by N digital receiving channels with the same polarization direction are first digitally beamformed. Only then can the combined signal have an effective resolvable signal-to-noise ratio.

[0054] Step 103: Based on the channel estimation of the signal in each polarization direction of each user terminal, determine the combining coefficient of the signal in each polarization direction of each user terminal. Based on the combining coefficient of the signal in the two polarization directions of each user terminal, combine the digital beamforming signals in the two polarization directions of each user terminal to obtain the combined signal.

[0055] Suppose that the time-domain signals of a user's digital beamforming in two polarization directions are as follows: h and v ,in, h This is the signal synthesized by digital beamforming in the horizontal polarization direction at the user terminal.v To modify the digital beamforming signal in the vertical polarization direction at the user terminal, the combining coefficients in the horizontal polarization direction of the signal at the user terminal are determined based on the channel estimation of the signal. e h Based on the channel estimation of the signal in the vertical polarization direction of the user terminal, the combining coefficient of the signal in the vertical polarization direction of the user terminal is determined. e v The combined signal is obtained by combining the signals synthesized by digital beamforming in the two polarization directions at the user terminal. S for:

[0056] 。

[0057] This embodiment performs digital beamforming on the signals received by N digital receiving paths for each polarization direction at each user terminal. The synthesized signal has an effective and distinguishable signal-to-noise ratio, achieving high gain performance of a large digital phased array. The combined signal is obtained by combining the combined signals obtained by channel estimation of the signals for each polarization direction at each user terminal, significantly improving the polarization matching loss problem of circularly polarized satellite reception.

[0058] Based on the above embodiments, this embodiment uses the following formula to combine the digital beamforming signals from the two polarization directions of each user terminal according to the combining coefficients of the signals in the two polarization directions of each user terminal to obtain the combined signal:

[0059]

[0060] in, S The combined signal, h The signal is digitally beamformed in the horizontal polarization direction at the user end. v The signal synthesized by digital beamforming in the vertical polarization direction of the user terminal. and Corresponding to h and v Channel estimation, and Corresponding to and The conjugate of complex numbers.

[0061] and This is a least-squares solution for the combined coefficients.

[0062] Based on the above embodiments, this embodiment, after acquiring the user terminal signals received by the two digital receiving paths of each of the N antennas in the digital phased array, further includes:

[0063] The signals received by the user terminal from the two digital receiving paths of each antenna are converted from time-domain signals to frequency-domain signals.

[0064] The assumption that there is no or negligible time delay between h and v is reasonable, especially since two orthogonally polarized antennas are usually very close together. However, for direct-connection mobile phone satellites, the antenna array is typically very large, meaning N is very large, and the physical link is very complex, requiring consideration of the time delay between the two orthogonally polarized signals.

[0065] After receiving two sets of orthogonal polarization signals from the user end, the signals are transferred to the frequency domain for multi-user signal time-frequency resource extraction. After extraction, each user corresponds to two polarization components, and the signals are combined using the optimal EVM merging method.

[0066] Frequency domain signal combining offers many additional benefits besides handling time delays, because antenna polarization is highly frequency-dependent. Assuming the signal... h and v The corresponding frequency domain signals are respectively H and V Channel estimation and The corresponding frequency domain channel estimates are as follows: and , and Corresponding to and The conjugate complex number. Then the frequency domain signal synthesized by digital beamforming in the two polarization directions at the user end. H and V The combined signal obtained by merging S for:

[0067] 。

[0068] Based on the above embodiments, this embodiment combines the digital beamforming signals from the two polarization directions of each user terminal according to the combining coefficients of the signals in each user terminal to obtain a combined signal, including:

[0069] The combining coefficient pairs formed by the combining coefficients of the signals in the two polarization directions at each user terminal are optimized to minimize the EVM (Error Vector Magnitude) of the combined signal, thus obtaining the optimal combining coefficient pair.

[0070] Based on the optimal combining coefficient pairs corresponding to each user terminal, the signals synthesized by digital beamforming in the two polarization directions of each user terminal are combined to obtain the combined signal.

[0071] Find a suitable e through optimization algorithms. h and e v The expression that minimizes the EVM of the combined signal S is as follows:

[0072] .

[0073] This embodiment combines signals using the optimal EVM combining method, which significantly improves the polarization matching loss problem in circularly polarized satellite reception.

[0074] Based on the above embodiments, this embodiment optimizes the combining coefficient pairs formed by the combining coefficients of signals in the two polarization directions at each user terminal, so as to minimize the EVM of the combined signal and obtain the optimal combining coefficient pair, including:

[0075] Exchange and / or change the combining coefficients in at least one polarization direction between the combining coefficient pairs corresponding to each user terminal within a preset range to obtain new combining coefficient pairs for each user terminal.

[0076] Based on the new combining coefficients of each user terminal, the signals synthesized by digital beamforming in the two polarization directions of each user terminal are combined to obtain a new combined signal.

[0077] Calculate the EVM of the new combined signal and the original combined signal at each user terminal, and take the combined coefficient pair corresponding to the combined signal with the smallest EVM as the optimal combined coefficient pair.

[0078] Due to the complexity of direct satellite communication between mobile phones, there is no very accurate method to estimate the signal-to-noise ratio, which makes it difficult to measure the error of channel estimation. Therefore, a search algorithm is used to further optimize the least squares result.

[0079] The original combining coefficient pairs corresponding to each user terminal are changed to obtain new combining coefficient pairs. This can be done by exchanging the combining coefficients between combining coefficient pairs and / or changing the combining coefficients within a preset range.

[0080] Based on the original combining coefficient pairs at each user terminal, the digital beamforming signals in both polarization directions at each user terminal are combined to obtain the original combined signal. Based on the new combining coefficient pairs at each user terminal, the digital beamforming signals in both polarization directions at each user terminal are combined to obtain the new combined signal. The combining coefficient pair corresponding to the combined signal with the smallest EVM among all signals is selected as the optimal combining coefficient pair.

[0081] The preset amplitude range can be [0.95, 1.05].

[0082] Based on the above embodiments, such as Figure 3As shown, in this embodiment, the combining coefficients in at least one polarization direction between the combining coefficient pairs corresponding to each user terminal are exchanged and / or changed within a preset amplitude range to obtain new combining coefficient pairs for each user terminal, including:

[0083] Construct a set of the combination coefficient pairs corresponding to the smallest preset number of EVMs in the EVMs of the combined signals generated from all user-end combination coefficient pairs.

[0084] Select the two combining coefficient pairs with the smallest EVM from the set, and exchange the combining coefficients in at least one polarization direction between the two combining coefficient pairs to form a first new combining coefficient pair. Add the first new combining coefficient pair to the set if a preset condition is met.

[0085] If the first new combining coefficient pair does not meet the preset conditions, two combining coefficient pairs are randomly selected from the set, and the combining coefficients in at least one polarization direction between the two randomly selected combining coefficient pairs are exchanged to form a second new combining coefficient pair. The second new combining coefficient pair is added to the set if the preset conditions are met.

[0086] If the second new combining coefficient pair does not meet the preset conditions, a combining coefficient pair is randomly selected from the set, and the combining coefficient of at least one signal in at least one polarization direction is randomly changed within a preset amplitude range to form a third new combining coefficient pair. The third new combining coefficient pair is added to the set if the preset conditions are met.

[0087] If the third new combination coefficient pair does not meet the preset conditions, continue to iterate the above steps on the current set until the preset number of iterations is reached.

[0088] Let K be a pair of combining coefficients, K = {e h e v}. Using signals from different clients, estimate the combining coefficient pairs K separately. This will result in a series of combining coefficient pairs. Further perform the following operation: Select the n combining coefficient pairs with the best EVM to form a new initial set, denoted as initial set C = [K1K2K3…K]. n ].

[0089] The first step is to select the two best combining coefficient pairs with the best EVM from this set, randomly swap one of the polarization combining coefficients, and calculate the EVM of the synthesized signal synthesized by the two new combining coefficient pairs. If the EVM of the new combining coefficient pair meets the preset condition, such as being less than the maximum value of the EVM of the combining coefficient pairs in set C, then the newly generated combining coefficient pair (K1', K2') is added to set C to form a new set C.

[0090] The second step is to randomly select two combining coefficient pairs from set C, swap one of the polarization combining coefficients, and calculate the EVM of the two new combining coefficient pairs. If the EVM of the new combining coefficient pairs meets the preset condition, such as being less than the maximum value of the EVM of the combining coefficient pairs in set C, then the newly generated combining coefficient pairs are added to set C to form a new set C.

[0091] The third step is to randomly select a combination coefficient pair from the set, and then randomly select one combination coefficient from this combination coefficient pair. The random value in the interval [0.95, 1.05] is used as the update magnitude of the selected combination coefficient to obtain a new combination coefficient pair. If the EVM of the new combination coefficient pair meets the preset condition, such as being less than the maximum value of the EVM of the combination coefficient pairs in set C, then the newly generated combination coefficient pair is added to set C to form a new set C.

[0092] Fourth step: If the number of elements in set C is greater than 4n, then delete the worst-performing combination path coefficient pairs until the number of elements in C is no greater than 4n.

[0093] Repeat steps one through three above until the preset number of iterations is reached.

[0094] Finally, the best combining factor pair in terms of EVM performance is selected as the optimal combining factor pair.

[0095] Based on the above embodiments, the preset condition in this embodiment is that the ratio between the EVM of the combined signal corresponding to the second new combining coefficient pair or the third new combining coefficient pair and the maximum value of the EVM of the combined signal corresponding to the combining coefficient pair in the current set is less than a preset ratio.

[0096] Based on the above embodiments, such as Figure 3 As shown, in this embodiment, if the third new combining coefficient pair does not meet the preset conditions, the above steps are continued to iterate over the current set until the preset number of iterations is reached, including:

[0097] If the third new combining coefficient pair does not meet the preset conditions, and if the number of combining coefficient pairs in the set is greater than the preset number, then delete the multiple combining coefficient pairs with the largest EVM of the corresponding combined signal from the set, so that the number of combining coefficient pairs in the set is less than or equal to the preset number.

[0098] Repeat the above steps for the deleted set until the preset number of iterations is reached.

[0099] The following describes the multi-user uplink polarization signal processing device in a large digital phased array provided by the present invention. The multi-user uplink polarization signal processing device in a large digital phased array described below and the multi-user uplink polarization signal processing method in a large digital phased array described above can be referred to in correspondence with each other.

[0100] like Figure 4 As shown, the device includes an acquisition module 401, a synthesis module 402, and a merging module 403, wherein:

[0101] The acquisition module 401 is used to acquire the user terminal signals received by the two digital receiving paths of each of the N antennas in the digital phased array. Each digital receiving path corresponds to a polarization direction, and N is a positive integer greater than or equal to 2.

[0102] The synthesis module 402 is used to perform digital beamforming on the signals of each user terminal in each polarization direction based on the signals received by the N digital receiving channels in each polarization direction.

[0103] The merging module 403 is used to determine the combining coefficient of the signal in each polarization direction of each user terminal based on the channel estimation of the signal in each polarization direction of each user terminal, and to merge the digital beamformed signals in the two polarization directions of each user terminal based on the combining coefficient of the signal in the two polarization directions of each user terminal to obtain the combined signal.

[0104] This embodiment performs digital beamforming on the signals received by N digital receiving paths for each polarization direction at each user terminal. The synthesized signal has an effective and distinguishable signal-to-noise ratio, achieving high gain performance of a large digital phased array. The combined signal is obtained by combining the combined signals obtained by channel estimation of the signals for each polarization direction at each user terminal, significantly improving the polarization matching loss problem of circularly polarized satellite reception.

[0105] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5As shown, the electronic device may include a processor 510, a communication interface 520, a memory 530, and a communication bus 540. The processor 510, communication interface 520, and memory 530 communicate with each other via the communication bus 540. The processor 510 can call logic instructions in the memory 530 to execute a multi-user uplink polarization signal processing method in a large digital phased array. This method includes: acquiring user-end signals received by two digital receiving paths of each of the N antennas in the digital phased array, where each digital receiving path corresponds to a polarization direction, and N is a positive integer greater than or equal to 2; performing digital beamforming on the signals of each user-end in each polarization direction based on the signals received by the N digital receiving paths for each polarization direction; determining the combining coefficient of the signals in each polarization direction based on the channel estimation of the signals in each polarization direction; and merging the digitally beamformed signals of each user-end in both polarization directions based on the combining coefficients of the signals in both polarization directions to obtain a combined signal.

[0106] Furthermore, the logical instructions in the aforementioned memory 530 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.

[0107] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the multi-user uplink polarization signal processing method in a large digital phased array provided by the above methods. The method includes: acquiring the signals received by the user end from two digital receiving paths of each of the N antennas in the digital phased array, where each digital receiving path corresponds to a polarization direction and N is a positive integer greater than or equal to 2; performing digital beamforming on the signals of each polarization direction of each user end based on the signals received by the N digital receiving paths of each polarization direction; determining the combining coefficient of the signals of each polarization direction of each user end based on the channel estimation of the signals of each polarization direction of each user end; and merging the digitally beamformed signals of each user end in the two polarization directions based on the combining coefficients of the signals of each polarization direction of each user end to obtain a combined signal.

[0108] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a method for processing multi-user uplink polarization signals in a large digital phased array provided by the methods described above. The method includes: acquiring signals received by user terminals from two digital receiving paths of each of the N antennas in the digital phased array, each digital receiving path corresponding to a polarization direction, where N is a positive integer greater than or equal to 2; performing digital beamforming on the signals of each user terminal in each polarization direction based on the signals received by the N digital receiving paths in each polarization direction; determining the combining coefficient of the signals in each polarization direction based on the channel estimation of the signals in each polarization direction of each user terminal; and merging the digitally beamformed signals in the two polarization directions of each user terminal based on the combining coefficients of the signals in the two polarization directions of each user terminal to obtain a combined signal.

[0109] 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.

[0110] 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.

[0111] 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 multi-user uplink polarization signal processing method in a large digital phased array, characterized in that, The method comprises the following steps: obtaining signals of user terminals received by two digital receiving channels of each antenna of N antennas of a digital phased array, each digital receiving channel corresponding to a polarization direction, N being a positive integer greater than or equal to 2; performing digital beam synthesis on signals of each user terminal in each polarization direction according to signals received by N digital receiving channels in each polarization direction; determining combining coefficients of signals of each user terminal in each polarization direction according to channel estimation of signals in each polarization direction of each user terminal, and combining digital beam synthesized signals in two polarization directions of each user terminal according to the combining coefficients of signals in the two polarization directions of each user terminal to obtain combined signals; combining digital beam synthesized signals in two polarization directions of each user terminal according to combining coefficients of signals in the two polarization directions of each user terminal to obtain combined signals, comprising: optimizing a combining coefficient pair formed by combining coefficients of signals in two polarization directions of each user terminal so that the EVM of the combined signals is minimum to obtain an optimal combining coefficient pair; exchanging and / or changing the combining coefficients in at least one polarization direction between the combining coefficient pairs corresponding to each user terminal within a preset amplitude range to obtain new combining coefficient pairs of each user terminal; combining digital beam synthesized signals in two polarization directions of each user terminal according to the new combining coefficient pairs of each user terminal to obtain new combined signals; and calculating the EVM of the new combined signals and the original combined signals of each user terminal respectively, and taking the combining coefficient pair corresponding to the combined signal with the minimum EVM as the optimal combining coefficient pair; combining digital beam synthesized signals in two polarization directions of each user terminal according to the optimal combining coefficient pair corresponding to each user terminal to obtain combined signals.

2. The method of claim 1, wherein, The combining of digital beam synthesized signals in two polarization directions of each user terminal according to the combining coefficients of signals in the two polarization directions of each user terminal to obtain combined signals is performed according to the following formula: wherein, S is the combined signal, h is the signal for digital beamforming in the user end horizontal polarization direction, v is the signal for digital beamforming in the user end vertical polarization direction, and correspond to h and v the channel estimation, and correspond to and the conjugate complex.

3. The method of claim 1, wherein, After obtaining the signals of user terminals received by two digital receiving channels of each antenna of N antennas of a digital phased array, the method further comprises the following steps: converting the signals of user terminals received by two digital receiving channels of each antenna from time domain signals to frequency domain signals.

4. The method of claim 1, wherein, The exchanging and / or changing of the combining coefficients in at least one polarization direction between the combining coefficient pairs corresponding to each user terminal within a preset amplitude range to obtain new combining coefficient pairs of each user terminal comprises: constructing a set from the combining coefficient pairs corresponding to the preset number of minimum EVMs among the EVMs of combined signals generated by the combining coefficient pairs corresponding to all user terminals; selecting two combining coefficient pairs with the minimum EVM from the set, exchanging the combining coefficients in at least one polarization direction between the two combining coefficient pairs to form a first new combining coefficient pair, and adding the first new combining coefficient pair to the set under the condition that a preset condition is met; In a case that the first new combining coefficient pair does not satisfy the preset condition, two combining coefficient pairs are randomly selected from the set, the combining coefficients in at least one polarization direction between the two randomly selected combining coefficient pairs are exchanged to form a second new combining coefficient pair, and the second new combining coefficient pair is added to the set in a case that the second new combining coefficient pair satisfies the preset condition; In a case that the second new combining coefficient pair does not satisfy the preset condition, one combining coefficient pair is randomly selected from the set, the combining coefficients of signals in at least one polarization direction of the randomly selected combining coefficient pair are randomly changed within a preset amplitude range to form a third new combining coefficient pair, and the third new combining coefficient pair is added to the set in a case that the third new combining coefficient pair satisfies the preset condition. In a case that the third new combining coefficient pair does not satisfy the preset condition, the above steps are iteratively executed on the current set until a preset iteration number is reached.

5. The method of claim 4, wherein, The preset condition is that a ratio between an EVM of a combining signal corresponding to the second new combining coefficient pair or the third new combining coefficient pair and a maximum value in EVMs of combining signals corresponding to combining coefficient pairs in the current set is less than a preset ratio.

6. The method of claim 4, wherein, In a case that the third new combining coefficient pair does not satisfy the preset condition, the above steps are iteratively executed on the current set until a preset iteration number is reached, including: In a case that the third new combining coefficient pair does not satisfy the preset condition, if a number of combining coefficient pairs in the set is greater than a preset number, a plurality of combining coefficient pairs corresponding to combining signals with maximum EVMs are deleted from the set, so that the number of combining coefficient pairs in the set is less than or equal to the preset number; The above steps are iteratively executed on the deleted set until a preset iteration number is reached.

7. A processing device for processing a multi-user uplink polarization signal in a large digital phased array according to the method of any one of claims 1 to 6, characterized in that, The method comprises the following steps: The acquisition module is configured to acquire signals of user terminals received by two digital receiving paths of each antenna in N antennas of a digital phased array, each digital receiving path corresponding to one polarization direction, and N being a positive integer greater than or equal to 2. The synthesis module is configured to perform digital beam synthesis on signals of each user terminal in each polarization direction according to signals received by N digital receiving paths in each polarization direction. The merging module is configured to determine combining coefficients of signals of each user terminal in each polarization direction according to channel estimation of signals in each polarization direction of each user terminal, and perform merging on signals of each user terminal in two polarization directions which are digitally beam-synthesized according to the combining coefficients of signals of each user terminal in the two polarization directions to obtain combining signals.

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 implements the method for processing multi-user uplink polarized signals in a large digital phased array according to the program. The processor implements the method for processing multi-user uplink polarized signals in a large digital phased array according to the program.

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