Sampling method, system and equipment of broadband receiver and storage medium

Abstract

The invention discloses a broadband receiver sampling method, system and device and a storage medium, and relates to the technical field of receivers, and the method comprises the steps: obtaining an input signal of a broadband receiver; dividing an input signal into M paths of sub-signals through an analysis filter bank AFB; sampling each path of sub-signals at a rate of 1 / MT through an ADC, and then carrying out M-time interpolation to obtain M paths of digital signals with a sampling rate of 1 / T; enabling each path of digital signals to pass through a digital filter in a comprehensive filter bank SFB, and then adding and combining the digital signals to obtain an output signal; according to the method, the broadband receiver has larger receiving bandwidth and has remarkable advantages in the aspects of adapting to different communication systems, improving communication link robustness, improving broadband spectrum detection capability and the like, if the structure can be realized, the design of an analog part of the broadband receiver is greatly simplified, and the design cost is reduced. And the receiver can be ensured to have the capability of receiving any sub-signal in the working frequency band.

Description

Technical Field

[0001] The present invention relates to the technical field of receivers, and in particular to a sampling method, system, device and storage medium of a broadband receiver. Background Art

[0002] Traditional receivers generally adopt a "customized" design, that is, an analog RF front end is designed to adapt to the received signal based on the frequency, bandwidth and other parameters of the signal to be received (which means that these parameters must be known in advance).

[0003] Typical traditional receiver architectures include superheterodyne, zero intermediate frequency, and direct RF sampling. In all three architectures, narrowband anti-aliasing filters (i.e., bandpass / low-pass filters) must be used to filter out interference outside the received signal band.

[0004] Currently, receivers using these architectures can only receive narrowband signals that meet certain conditions. Specifically, the signal spectrum must be completely within the passband of the narrowband anti-aliasing filter. Summary of the invention

[0005] In view of the deficiency that the prior art can only receive narrowband signals that meet certain conditions and cannot receive any sub-signal in the working frequency band, the present invention proposes a broadband receiver sampling method, system, device and storage medium, which perform full-band sampling on the entire working frequency band, and then extract and further demodulate each sub-signal in the working frequency band in the digital domain, thereby solving the problems existing in the prior art.

[0006] A broadband receiver sampling method comprises the following steps:

[0007] obtaining an input signal of a wideband receiver;

[0008] The input signal is divided into M-path signals through the analysis filter bank AFB;

[0009] Each sub-signal is sampled by an analog-to-digital converter ADC and then interpolated M times to obtain M digital signals;

[0010] Each digital signal is passed through a digital filter in the comprehensive filter bank SFB and then added and combined to obtain an output signal.

[0011] Furthermore, each sub-signal path includes two paths, I and Q. In the I and Q paths, the input signal is converted into a baseband signal through two orthogonal analog down-converters and a low-pass filter.

[0012] Furthermore, each sub-signal is sampled at a rate of 1 / MT through an ADC to obtain an analog spectrum of the signal, and the analog spectrum is a periodic extension of the input signal, and all extended components are free of aliasing.

[0013] Furthermore, among all the extended components of the input signal, the extended component within the baseband equivalent frequency band [-π / T, π / T] exists and is unique.

[0014] Furthermore, for any input signal limited to [-π / T,π / T], the output signal is a distortion-free sampling signal of the input signal; where T represents the period, 1 / T is the frequency f, and π / T represents a range of angular frequencies.

[0015] The present invention also includes a broadband receiver sampling system, comprising:

[0016] An acquisition module, used for acquiring an input signal of a broadband receiver;

[0017] A division module, used for dividing the input signal into M sub-signals through an analysis filter bank AFB;

[0018] The sampling module is used to sample each sub-signal through an analog-to-digital converter ADC, and then perform M-fold interpolation to obtain M digital signals;

[0019] The output module is used to add and combine each digital signal after passing it through a digital filter in the comprehensive filter bank SFB to obtain an output signal.

[0020] The present invention also includes a wideband receiver sampling computer device, including: a memory, a processor and a computer program stored in the memory, and the processor implements the steps of the wideband receiver sampling method when executing the computer program.

[0021] The present invention also includes a readable storage medium, wherein the readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, they are used to execute the steps of the broadband receiver sampling method.

[0022] The present invention provides a broadband receiver sampling method, system, device and storage medium, which have the following beneficial effects:

[0023] The present invention divides a broadband input signal into multiple sub-band signals through an analysis filter group, and then samples and interpolates them respectively through ADC, and then merges each obtained digital signal through a digital filter of a comprehensive filter group SFB to obtain an output signal; this method performs full-frequency sampling on the entire working frequency band through a group of analysis filter groups and a group of digital filters working together. Compared with a traditional narrowband receiver, the present invention can ensure that the receiver has the ability to receive any sub-signal in the working frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a general block diagram of an ideal software radio receiver in the present invention specification;

[0025] Figure 2 A flowchart of a broadband sampling method according to an embodiment of the present invention;

[0026] Figure 3 The frequency response characteristic diagram of the Butterworth filter in the embodiment of the present invention;

[0027] Figure 4 is an ideal SFB frequency response diagram that fully matches in an embodiment of the present invention;

[0028] Figure 5 Graph showing the frequency response of the FIR filter in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] like Figure 1 The broadband receiver shown in the figure is required to be able to receive signals at any frequency position within a wide frequency band. The wide frequency band is called the working frequency band of the broadband receiver.

[0031] The present invention provides a broadband receiver sampling method, comprising the following steps:

[0032] Step 1: First, the input signal χ(t) is divided into M sub-signals through an analysis filter bank (AFB), each of which contains two paths (referred to as I path and Q path, respectively).

[0033] Step 2: In the I and Q paths, χ(t) passes through two orthogonal analog downconverters and a low-pass filter H. c (s), thereby moving a sub-band to the baseband. Converting the input signal to a baseband signal allows the ADC to have an analog input bandwidth slightly larger than the width of a single sub-band, reducing the performance requirements of the ADC and facilitating sampling.

[0034] Step 3: Then, each sub-signal is sampled by an ADC at a rate of 1 / MT, and then interpolated M times, so as to obtain M digital signals with a sampling rate of 1 / T; the analog spectrum of the signal obtained after each sub-signal is sampled by an ADC at a rate of 1 / MT is a periodic extension of the input signal, and all extended components are not aliased.

[0035] Step 4: Each digital signal passes through a digital filter in the synthesis filter bank (SFB), and then all M signals are added and combined to obtain the output signal

[0036] Step 5: Finally, for any input signal X(t) limited to [-π / T,π / T], the output signal is the undistorted sampled signal of X(t). This requirement is equivalent to, The spectrum should be a complete reconstruction of the spectrum of the undistorted sampled signal X(t). Among all the extended components of the input signal, the extended component in the baseband equivalent frequency band [-π / T,π / T] exists and is unique. Where T represents the period, 1 / T is the frequency f, and pi divided by T represents an angular frequency range. The angular frequency is often used as the x-axis in the signal coordinates.

[0037] HFB is composed of a set of analog analysis filter banks (AFB) and a set of digital synthesis filter banks (SFB); AFB and SFB must match each other to ensure that the output signal spectrum of HFB is a complete reconstruction of the input signal spectrum; AFB is designed first, then SFB is designed. When designing AFB, an analog filter with a simple transfer function (such as Butterworth filter) is directly constructed as AFB to simplify the analog part of HFB as much as possible. The design of SFB can be divided into two steps, namely, first calculating the ideal SFB frequency response that matches the AFB frequency response, and then using a finite impulse response (FIR) filter to approximate the ideal SFB frequency response. Figure 2 The parallel sampling structure based on HFB is demonstrated. The input signal X(t) is divided into M sub-signals through AF B. Then, each sub-signal is sampled by an ADC at a rate of 1 / MT, and then interpolated M times to obtain M digital signals with a sampling rate of 1 / T. Finally, each digital signal passes through a digital filter in SFB, and then all M signals are added and combined to obtain the output signal.

[0038] The simulation effect of the present invention is as follows Figures 3 to 5 As shown, taking the 0~1GHz four-channel HFB as an example, Figure 3 This is the frequency response characteristic diagram of the Butterworth filter. Figure 4 For a perfect match with the ideal SFB frequency response diagram, Figure 5 This is the frequency response diagram of the FIR filter.

[0039] Based on the same inventive concept, the present invention proposes a broadband receiver sampling system, comprising:

[0040] The acquisition module is used to acquire the input signal of the broadband receiver.

[0041] The division module is used to divide the input signal into M sub-signals through the analysis filter bank AFB.

[0042] The sampling module is used to sample each sub-signal at a rate of 1 / MT through an ADC, and then perform M-fold interpolation to obtain M-channel digital signals with a sampling rate of 1 / T.

[0043] The output module is used to add and combine each digital signal after passing it through a digital filter in the comprehensive filter bank SFB to obtain an output signal.

[0044] Based on the same inventive concept, the present invention also proposes a wideband receiver sampling computer device, comprising: a memory, a processor and a computer program stored in the memory, and the processor implements the steps of the wideband receiver sampling method when executing the computer program.

[0045] Based on the same inventive concept, the present invention also proposes a readable storage medium, which stores a computer program. The computer program includes program instructions. When the program instructions are executed by a processor, they are used to execute the steps of the broadband receiver sampling method.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A broadband receiver sampling method, characterized in that: The following steps are involved: obtaining an input signal of a wideband receiver; The input signal is divided into M-path sub-signals through the analysis filter bank AFB; Each sub-signal is sampled by an analog-to-digital converter ADC and then interpolated M times to obtain M digital signals; Each digital signal is passed through a digital filter in the comprehensive filter bank SFB and then added and combined to obtain an output signal.

2. A broadband receiver sampling method according to claim 1, characterized in that: Each sub-signal path includes two paths, I and Q. In the I and Q paths, the input signal is converted into a baseband signal through two orthogonal analog down-converters and a low-pass filter.

3. A broadband receiver sampling method according to claim 1, characterized in that: Each sub-signal is sampled at a rate of 1 / MT through an ADC to obtain an analog spectrum of the signal. The analog spectrum is a periodic extension of the input signal, and all extended components are free of aliasing.

4. A broadband receiver sampling method according to claim 3, characterized in that: Among all the extended components of the input signal, the extended component within the baseband equivalent frequency band [-π / T, π / T] exists and is unique.

5. A broadband receiver sampling method according to claim 4, characterized in that: For any input signal limited to [-π / T,π / T], the output signal is a distortion-free sample of the input signal; where T represents the period, 1 / T is the frequency f, and π / T represents a range of angular frequencies.

6. A broadband receiver sampling system, characterized in that: include: An acquisition module, used for acquiring an input signal of a broadband receiver; A division module, used for dividing the input signal into M sub-signals through an analysis filter bank AFB; The sampling module is used to sample each sub-signal through an analog-to-digital converter ADC, and then perform M-fold interpolation to obtain M digital signals; The output module is used to add and combine each digital signal after passing it through a digital filter in the comprehensive filter bank SFB to obtain an output signal.

7. A broadband receiver sampling computer device, characterized in that include: A memory, a processor and a computer program stored in the memory, wherein the processor implements the steps of the wideband receiver sampling method according to any one of claims 1 to 5 when executing the computer program.

8. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and the computer program includes program instructions. When the program instructions are executed by a processor, they are used to execute the steps of the wideband receiver sampling method according to any one of claims 1 to 5.

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