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CN-122026976-A - Unknown signal reconstruction error control method based on double-channel cooperation

CN122026976ACN 122026976 ACN122026976 ACN 122026976ACN-122026976-A

Abstract

A two-channel cooperative unknown signal reconstruction error control method belongs to the technical field of wireless communication. The invention solves the problem that the existing method can not give consideration to the signal reconstruction precision and the information content contained in the signal. The invention provides a scheme of combining the double-channel collaborative quantization and error control of a receiving end, wherein a double-channel quantization mechanism realizes information complementation through different quantization characteristics, suppresses single-channel error accumulation and improves signal detail retention capacity. And (3) predicting and compensating the quantization information by combining an interpolation processing method, optimizing reconstruction output, and completing high-fidelity signal recovery. The method can remarkably improve the reconstruction precision and fidelity of the unknown signal, ensure the robustness and adaptability of the system under the condition of lacking prior information, and simultaneously reduce the extreme dependence on the performance of the single-channel quantizer, thereby realizing the efficient balance of computing resources and reconstruction quality. The method of the invention can be applied to the field of wireless communication.

Inventors

  • SHA XUEJUN
  • WANG SIHAN
  • WANG YITING
  • XU YAXI
  • Qin Lianxi

Assignees

  • 哈尔滨工业大学

Dates

Publication Date
20260512
Application Date
20260227

Claims (10)

  1. 1. The method for controlling the reconstruction error of the unknown signals through the two-channel cooperation is characterized by comprising the following steps of: step 1, a receiver receives an unknown signal After down-conversion processing, the signals after the down-conversion processing are respectively sent to a first analog-to-digital converter and a second analog-to-digital converter, wherein: Outputting the first channel quantized data sequence by a first analog-to-digital converter , , Quantizing the data sequence for the first channel respectively The 1 st, the 2 nd third, fifth and sixth aspects of the present invention Data to be The corresponding discrete time component first channel discrete time sequence is recorded as , The total sampling point number of the first analog-to-digital converter; Outputting the second channel quantized data sequence by a second analog-to-digital converter , , Quantizing the data sequences for the second channels, respectively The 1 st, the 2 nd third, fifth and sixth aspects of the present invention Data to be The corresponding discrete time component of the second channel discrete time sequence is recorded as , The total sampling point number of the second analog-digital converter; Step 2, discrete time sequence Discrete quantized data sequence in a first channel at various points in time The corresponding data points in the data sequence are sequentially extracted, and the extracted data is used for forming a first channel extraction data sequence ; Wherein, the Extract the 1 st, 2 nd, and third of the data sequence for the first channel, respectively Data; step 3, quantizing the second channel data sequence Difference is made between the extracted data of the first channel and the data at the corresponding position in the extracted data sequence to obtain a reference point error sequence ; Wherein, the Represents the 1 st, 2 nd, & gt, the h in the reference point error sequence Data; Step 4, discrete time sequence in the first channel On the reference point error sequence Performing piecewise interpolation to obtain an interpolated error sequence ; Step 5, error sequence Summing the data at the corresponding position in the quantized data sequence of the first channel to obtain a discrete signal sequence after interpolation compensation Obtaining the unknown signal reconstruction result.
  2. 2. The method for controlling the reconstruction error of an unknown signal by two-channel cooperation according to claim 1, wherein the sampling frequency of the down-converted signal by the first analog-to-digital converter is The total sampling time is And the quantization bit number is 4bit sampling quantization.
  3. 3. The method for controlling the reconstruction error of an unknown signal by two-channel cooperation according to claim 2, wherein the sampling frequency of the signal by the second analog-to-digital converter is The total sampling time is And the quantization bit number is 16bit sampling quantization.
  4. 4. A method for controlling an unknown signal reconstruction error in a dual channel collaborative process according to claim 3, wherein the sampling frequency is such that 。
  5. 5. The method for controlling the reconstruction error of a two-channel collaborative unknown signal according to claim 4, wherein the ratio of sampling rates is , , Is an integer.
  6. 6. The method for controlling the reconstruction error of the unknown signal by the two-channel cooperation according to claim 5, wherein the specific process of the step 4 is as follows: step 41, discrete time sequence according to the second channel And reference point error sequence Construction function So that the elements in both sequences satisfy ; Wherein, the ; Step 42, according to the function Proceeding with The point segment fitting interpolation is carried out to obtain an interpolated error sequence, thereby meeting the following requirements 。
  7. 7. The method for controlling the reconstruction error of an unknown signal by two-channel cooperation according to claim 6, wherein the specific process of step 42 is as follows: Discrete time sequence for first channel Any one of the time points: If the time point is the time point in the discrete time sequence of the second channel, the error corresponding to the time point is directly based on the function Determining; If the time point is not the time point in the discrete time sequence of the second channel, the error corresponding to the time point is required to be obtained through piecewise fitting interpolation; the method for piecewise fitting interpolation comprises the following steps: Step 421, for any time point in the first channel discrete time sequence where interpolation is required Discrete time sequence in the second channel Is selected from The time points used for fitting; step 422, extracting in step 421 The sequence consisting of the individual time points is noted as , wherein, Respectively represent the 1 st, 2 nd, and third selected Time points; Will be The sequence of corresponding function value components is recorded as According to the extraction Interpolation is carried out on each time point, the function value corresponding to the extracted time point and the Newton interpolation function, and interpolation points are obtained Corresponding errors.
  8. 8. The method of claim 7, wherein in the step 421, the time point selection strategy is: 1. When (when) Even number: if the second channel is discrete time series Is smaller than The number of time points of (2) is greater than or equal to And a second channel discrete time sequence More than one of The number of time points of (2) is greater than or equal to Then from the sequence Is smaller than Is selected to be closest to the time point of (2) A kind of electronic device At each time point, from the sequence Is greater than Is selected to be closest to the time point of (2) A kind of electronic device Time points; if the second channel is discrete time series Is smaller than The number of time points of (a) is less than Then select the sequence Is smaller than From all time points of the sequence Is greater than Is selected to be closest to the time point of (2) The number of the selected total time points is set as ; If the second channel is discrete time series More than one of The number of time points of (a) is less than Then select the sequence More than one of From all time points of the sequence Is smaller than Is selected to be closest to the time point of (2) The number of the selected total time points is set as ; 2. When (when) When the number is odd, the following mode (1) or mode (2) is adopted: Mode (1) If the second channel is discrete time series Is smaller than The number of time points of (2) is greater than or equal to And a second channel discrete time sequence More than one of The number of time points of (2) is greater than or equal to Then from the sequence Is smaller than Is selected to be closest to the time point of (2) A kind of electronic device At each time point, from the sequence Is greater than Is selected to be closest to the time point of (2) A kind of electronic device Time points; if the second channel is discrete time series Is smaller than The number of time points of (a) is less than Then select the sequence Is smaller than From all time points of the sequence Is greater than Is selected to be closest to the time point of (2) The number of the selected total time points is set as ; If the second channel is discrete time series More than one of The number of time points of (a) is less than Then select the sequence Is greater than From all time points of the sequence Is smaller than Is selected to be closest to the time point of (2) The number of the selected total time points is set as ; Mode (2) If the second channel is discrete time series Is smaller than The number of time points of (2) is greater than or equal to And a second channel discrete time sequence More than one of The number of time points of (2) is greater than or equal to Then from the sequence Is smaller than Is selected to be closest to the time point of (2) A kind of electronic device At each time point, from the sequence Is greater than Is selected to be closest to the time point of (2) A kind of electronic device Time points; if the second channel is discrete time series Is smaller than The number of time points of (a) is less than Then select the sequence Is smaller than From all time points of the sequence Is greater than Is selected to be closest to the time point of (2) The number of the selected total time points is set as ; If the second channel is discrete time series More than one of The number of time points of (a) is less than Then select the sequence More than one of From all time points of the sequence Is smaller than Is selected to be closest to the time point of (2) The number of the selected total time points is set as 。
  9. 9. The method for controlling the reconstruction error of an unknown signal by two-channel cooperation according to claim 8, wherein the specific process of newton interpolation is as follows: Step one, according to the extracted Calculating the difference quotient of each step according to the function values corresponding to each time point and the extracted time point: step two, constructing a difference quotient table according to the calculation result in the step one; Step three, constructing a polynomial according to the difference quotient value on the diagonal line of the difference quotient table ; Fourth, interpolation points are obtained Substituting the polynomials constructed in step three Obtaining interpolation points Corresponding function value, i.e. obtaining interpolation point Corresponding errors.
  10. 10. The method for controlling the reconstruction error of an unknown signal by two-channel cooperation according to claim 9, wherein the polynomial is The method comprises the following steps: Wherein, the Indicating the 1 st corresponding error selected, Representing the second order difference quotient, Representing the third order difference quotient, Representation of The difference of the order quotient, Indicating the 3 rd time point selected, Representing the selected first The time point at which the time point is the same, Time is indicated.

Description

Unknown signal reconstruction error control method based on double-channel cooperation Technical Field The invention belongs to the technical field of wireless communication, and particularly relates to a two-channel collaborative unknown signal reconstruction error control method. Background The feature extraction and reconstruction of the intercepted signals in a non-cooperative communication environment has become a research hotspot in the fields of electronic reconnaissance, spectrum supervision and software radio. Under the condition that no clear signal source control or cooperation exists, if the intercepted signals are required to be detected, analyzed and identified, the accuracy and the data volume of the intercepted signals are required to be high. Conventional single channel receiving systems face significant challenges in processing unknown signals. Limited by the hardware 'speed-resolution' trade-off, high-speed analog-to-digital converters (ADCs) tend to provide only a low number of quantization bits, introduce severe quantization noise and nonlinear distortion, and severely affect the recovery accuracy of weak or complex modulated signals, while high-quantization accuracy ADCs tend to provide higher data accuracy, but tend to provide only a low sampling rate, so that the amount of available analysis information is reduced, and the signal high-frequency information cannot be captured effectively, thereby affecting signal analysis and feature extraction. However, the increased need for accuracy and data volume of the intercepted signal analysis amplifies this discrepancy, which more highlights the necessity of effectively controlling the reconstructed signal error. The existing reconstruction method for non-cooperative interception signals can be mainly divided into two main categories, namely, one is the interpolation and restoration of a Sinc function based on the Nyquist sampling theorem, the mode is influenced by reconstruction signal distortion caused by time domain interception, the required filter performance is also influenced by the superposition of background noise to a great extent, and the second is to utilize the sparsity of the signals to conduct low-rate sampling in a compressed sensing mode, so that the sparsity of the signals in a certain domain is required to be ensured, but an optimal sparse basis is difficult to pre-select by an interception party, and the reconstruction performance is greatly reduced. In addition, the method is mostly based on a single-channel acquisition architecture, and is difficult to break through the theoretical upper limit of the physical performance of single hardware. When facing unknown signals, the two types of ADCs are utilized to collect data and realize data processing through controlling quantization errors on the premise of ensuring normal operation of hardware, so that high-precision and high-sampling-rate data streams are reconstructed, and the accuracy of subsequent deep analysis of the signals is expected to be improved. Disclosure of Invention The invention provides a two-channel collaborative unknown signal reconstruction error control method for solving the problem that the existing method cannot achieve both signal reconstruction accuracy and information content contained in signals. The invention adopts the technical scheme that the method for controlling the unknown signal reconstruction error by the double-channel synergy comprises the following steps: step 1, a receiver receives an unknown signal After down-conversion processing, the signals after the down-conversion processing are respectively sent to a first analog-to-digital converter and a second analog-to-digital converter, wherein: Outputting the first channel quantized data sequence by a first analog-to-digital converter ,,Quantizing the data sequence for the first channel respectivelyThe 1 st, the 2 nd third, fifth and sixth aspects of the present inventionData to beThe corresponding discrete time component first channel discrete time sequence is recorded as,The total sampling point number of the first analog-to-digital converter; Outputting the second channel quantized data sequence by a second analog-to-digital converter ,,Quantizing the data sequences for the second channels, respectivelyThe 1 st, the 2 nd third, fifth and sixth aspects of the present inventionData to beThe corresponding discrete time component of the second channel discrete time sequence is recorded as,The total sampling point number of the second analog-digital converter; Step 2, discrete time sequence Discrete quantized data sequence in a first channel at various points in timeThe corresponding data points in the data sequence are sequentially extracted, and the extracted data is used for forming a first channel extraction data sequence; Wherein, the Extract the 1 st, 2 nd, and third of the data sequence for the first channel, respectivelyData; step 3, quantizing the second channel data sequence Di