阅读说明：本技术 一种高无杂散动态范围的信号接收装置与方法 (Signal receiving device and method with high spurious-free dynamic range ) 是由 徐强 霍胥男 邵猛 刘颖 唐友喜 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种高无杂散动态范围的信号接收装置与方法，包括第一接收天线（1）、第二接收天线（5）、第三接收天线（12）、衰减器（6）、第一混频器（2）、第二混频器（7）、第三混频器（13）、第一模数转换器（3）、第二模数转换器（8）、第三模数转换器（14）、本地振荡器（10）、第一锁相环（9）、第二锁相环（11）和SFDR校正单元（4）。本发明可以在数字域上有效抑制由模数转换器产生的非线性杂散。且不需要对射频前端电路进行大幅修改，便于对现有接收机进行升级改造。(The invention discloses a signal receiving device and a signal receiving method with a high spurious-free dynamic range, which comprise a first receiving antenna (1), a second receiving antenna (5), a third receiving antenna (12), an attenuator (6), a first mixer (2), a second mixer (7), a third mixer (13), a first analog-to-digital converter (3), a second analog-to-digital converter (8), a third analog-to-digital converter (14), a local oscillator (10), a first phase-locked loop (9), a second phase-locked loop (11) and an SFDR correction unit (4). The invention can effectively suppress the nonlinear stray generated by the analog-to-digital converter in the digital domain. And the radio frequency front-end circuit does not need to be greatly modified, so that the existing receiver is convenient to upgrade and reform.)

1. A signal receiving apparatus with high spurious-free dynamic range, comprising: the device comprises a first receiving antenna (1), a second receiving antenna (5), a third receiving antenna (12), a first mixer (2), a second mixer (7), a third mixer (13), a local oscillator (10), a first phase-locked loop (9), a second phase-locked loop (11) and an SFDR correction unit (4);

the output end of the first receiving antenna (1) is connected with the first input end of the first mixer (2); the output end of the second receiving antenna (2) is connected with the first input end of a second mixer (7) through an attenuator (6); the output end of the third receiving antenna (12) is connected with the first input end of a third mixer (13); the output end of the local oscillator (10) is respectively connected with a first phase-locked loop (9) and a second phase-locked loop (10), the output end of the first phase-locked loop (9) is respectively connected with the second input end of the first frequency mixer (2) and the second input end of the second frequency mixer (7), and the output end of the second phase-locked loop (11) is connected with the second input end of the third frequency mixer (13); the output end of the first mixer (2) is connected with an SFDR correction unit (4) through a first analog-to-digital converter (3); the output end of the second mixer (7) is connected with the SFDR correction unit (4) through a second analog-to-digital converter (8); the output end of the third mixer (13) is connected with an SFDR correction unit (4) through a third analog-to-digital converter (14), and the SFDR correction unit (4) is used for suppressing the nonlinear spurs of the received signals and outputting correction signals with high SFDR values.

2. The signal receiving apparatus with high spurious-free dynamic range according to claim 1, wherein: the SFDR correction unit (4) includes:

the frequency diversity correction module is used for carrying out frequency diversity identification on the spurious signals in the frequency spectrum according to the signals output by the first analog-to-digital converter (3) and the third analog-to-digital converter (14), and setting the spurious signals in the frequency spectrum to zero to realize correction;

and the power diversity correction module is used for performing power diversity identification on the spurious signals in the frequency spectrum according to the signals output by the first analog-to-digital converter (3) and the second analog-to-digital converter (8), and setting the spurious signals in the frequency spectrum to zero to realize correction.

3. A signal receiving method with high spurious-free dynamic range is characterized in that: the method comprises the following steps:

s1, configuring a first phase-locked loop (9) and a second phase-locked loop (11) to enable the first phase-locked loop and the second phase-locked loop to generate different frequencies;

s2, a first receiving antenna (1), a second receiving antenna (5) and a third receiving antenna (12) receive the same signal;

s3, transmitting the signal received by the first receiving antenna (1) to a first mixer (2) for down-conversion, and transmitting the obtained signal to an SFDR correction unit (4) through a first analog-to-digital converter (3);

s4, after passing through an attenuator (6), the signal received by the second receiving antenna (5) is transmitted to a second mixer (7) for down-conversion, and the obtained signal is transmitted to the SFDR correction unit (4) through a second analog-to-digital converter (8);

s5, transmitting the signal received by the third receiving antenna (12) to a third mixer (13) for down-conversion, and transmitting the obtained signal to an SFDR correction unit (4) through a third analog-to-digital converter (14);

and S6, the SFDR correction unit (4) performs nonlinear spurious suppression according to the received signal, and obtains a correction signal with a high SFDR value to output the correction signal.

4. A method as claimed in claim 3, wherein the method further comprises: the step S6 includes a frequency diversity correction sub-step and a power diversity correction sub-step.

5. The method as claimed in claim 4, wherein the method further comprises: the frequency diversity syndrome step comprises:

a1, defining the signal output by the first A/D converter (3) as the main signal x (n), and the signal output by the third A/D converter (14) as the frequency offset signal x_f(n)；

A2, converting x (n) and x by fast Fourier transform_f(n) transforming to frequency domain, recording the frequency domain signal as X_FFT(k) And X_{f_FFT}(k)；

A3, mixing X_{f_FFT}(k) The point in (1) is integrally translated by n points to become X_{move_FFT}(k) So that X is_FFT(k) And X_{move_FFT}(k) The large signals in the middle are at the same frequency;

a4, making i equal to 1, i belongs to [1, N ], wherein N is the number of FFT points;

a5, comparison X_FFT(i) And X_{move_FFT}(i) The power difference between the two is recorded as:

P_f(i)＝X_FFT(i)-X_{move_FFT}(i)；

wherein, X_FFT(i) Represents X_FFT(k) I.e. X_FFT(k) A signal at frequency point i; x_{move_FFT}(i) Represents X_{move_FFT}(k) I.e. X_{move_FFT}(k) A signal at frequency point i;

a6, if P_f(i)＞P_{gate_f}And X_FFT(i)＞P_floorThen judging the signal X on the frequency point i_FFT(i) Is a stray signal, otherwise, judges the signal X on the frequency point i_FFT(i) Is not a spurious signal, where P_{gate_f}As a spurious decision threshold, P_floorIs the noise floor power;

a7, i is increased by 1, if the increased i is more than N, the step jumps to A8, otherwise, the step jumps to A5;

a8, judging according to A6, and adding X_FFT(k) All the spurious signals in the signal are set to be 0, and the signal after the 0 is recorded to be X_{FFT_0}(k)。

6. The method as claimed in claim 4, wherein the method further comprises: the power diversity syndrome step comprises:

b1, defining the signal collected by the second analog-to-digital converter (8) as a power back-off signal x_p(n)；

B2 transforming x by fast Fourier transform_p(n) transforming to frequency domain, recording the frequency domain signal as X_{p_FFT}(k)；

B3, making i equal to 1, and i ∈ [1, N ], where N is the number of FFT points;

b4, comparison X_{FFT_0}(i) And X_{p_FFT}(i) The power difference between the two is recorded as:

P_p(i)＝X_{FFT_0}(i)-X_{p_FFT}(i)；

wherein, X_{FFT_0}(i) Represents X_{FFT_0}(k) The (c) th signal of (a),namely X_{FFT_0}(k) A signal at frequency point i; x_{p_FFT}(i) Represents X_{p_FFT}(k) I.e. X_{p_FFT}(k) A signal at frequency point i;

b5, if P_p(i)＞P_{gate_p}And X_{FFT_0}(i)＞P_floorThen judging the signal X on the frequency point i_{FFT_0}(i) Is a stray signal, otherwise, judges the signal X on the frequency point i_{FFT_0}(i) Is not a spurious signal, where P_{gate_p}As a spurious decision threshold, P_floorIs the noise floor power;

a6, i is increased by 1, if the increased i is more than N, the operation jumps to B7, otherwise, the operation jumps to B4;

b7, judging according to B5, and converting X_{FFT_0}(k) All the spurious signals in the signal are set to be 0, and the signal after the 0 is recorded to be X_correct(k)。；

B8, converting the corrected frequency domain signal X by inverse fast Fourier transform_correct(k) Converted back to the time domain, the time domain signal being

Technical Field

The present invention relates to the field of communications, and in particular, to a signal receiving apparatus and method with a high spurious-free dynamic range.

Background

The Spurious-Free Dynamic Range (SFDR) is defined as: the ratio of the power value of the largest signal to the power value of the largest spur in the spectrum, as shown in fig. 1.

As can be seen from fig. 1, the power of the small signal is close to the power of the spur, and the frequency position of the spur is not fixed, so that the user cannot correctly distinguish the small signal from the spur from the frequency spectrum. In order to solve the above problem, the power value of the largest spur is usually used as a signal decision threshold in engineering, and only the component with the power value greater than the threshold in the spectrum is considered as a signal, and the rest are all spurs. The power level of the largest spur determines the power level of the smallest receivable signal.

Wireless communication receivers need to receive signals of different powers simultaneously. When a large signal enters the receiver, it saturates the analog-to-digital converter in the receiver, thereby generating a non-linear spur that degrades the SFDR value of the receiver.

Disclosure of Invention

The present invention is directed to overcome the deficiencies of the prior art and to provide a signal receiving apparatus and method with a high spurious-free dynamic range, which can effectively suppress the non-linear spurious generated by the analog-to-digital converter.

The purpose of the invention is realized by the following technical scheme: a signal receiving device with high spurious-free dynamic range comprises a first receiving antenna, a second receiving antenna, a third receiving antenna, a first mixer, a second mixer, a third mixer, a local oscillator, a first phase-locked loop, a second phase-locked loop and an SFDR correction unit;

the output end of the first receiving antenna is connected with the first input end of the first mixer; the output end of the second receiving antenna is connected with the first input end of the second mixer through an attenuator; the output end of the third receiving antenna is connected with the first input end of the third mixer; the output end of the local oscillator is respectively connected with a first phase-locked loop and a second phase-locked loop, the output end of the first phase-locked loop is respectively connected with the second input end of the first frequency mixer and the second input end of the second frequency mixer, and the output end of the second phase-locked loop is connected with the second input end of the third frequency mixer; the output end of the first frequency mixer is connected with the SFDR correction unit through a first analog-to-digital converter; the output end of the second mixer is connected with the SFDR correction unit through a second analog-to-digital converter; the output end of the third mixer is connected with the SFDR correction unit through the third analog-to-digital converter, and the SFDR correction unit is used for suppressing the nonlinear spurs of the received signals and outputting correction signals with high SFDR values.

Further, the SFDR correction unit includes:

the frequency diversity correction module is used for carrying out frequency diversity identification on the spurious signals in the frequency spectrum according to the signals output by the first analog-to-digital converter and the third analog-to-digital converter and setting the spurious signals in the frequency spectrum to zero so as to realize correction;

and the power diversity correction module is used for carrying out power diversity identification on the spurious signals in the frequency spectrum according to the signals output by the first analog-to-digital converter and the second analog-to-digital converter and setting the spurious signals in the frequency spectrum to zero so as to realize correction.

A signal receiving method with high spurious-free dynamic range comprises the following steps:

s1, configuring a first phase-locked loop and a second phase-locked loop to enable the first phase-locked loop and the second phase-locked loop to generate different frequencies;

s2, a second receiving antenna and a third receiving antenna of the first receiving antenna receive signals of the same receiving antenna;

s3, transmitting the signal received by the first receiving antenna to a first mixer for down-conversion, and transmitting the obtained signal to an SFDR correction unit through a first analog-to-digital converter;

s4, after passing through an attenuator, the signal received by the second receiving antenna is transmitted to a second mixer for down-conversion, and the obtained signal is transmitted to an SFDR correction unit through a second analog-to-digital converter;

s5, transmitting the signal received by the third receiving antenna to a third mixer for down-conversion, and transmitting the obtained signal to an SFDR correction unit through a third analog-to-digital converter;

and S6, the SFDR correction unit performs nonlinear spurious suppression according to the received signal, and obtains a correction signal with a high SFDR value to output the correction signal.

Further, the step S6 includes a frequency diversity correction sub-step and a power diversity correction sub-step.

The frequency diversity syndrome step comprises:

a1, defining the signal output by the first A/D converter as the main signal x (n), and the signal output by the third A/D converter as the frequency offset signal x_f(n)；

A2, converting x (n) and x by fast Fourier transform_f(n) transforming to frequency domain, recording the frequency domain signal as X_FFT(k) And X_{f_FFT}(k)；

A3, mixing X_{f_FFT}(k) The point in (1) is integrally translated by n points to become X_{move_FFT}(k) So that X is_FFT(k) And X_{move_FFT}(k) The large signals in the middle are at the same frequency;

a4, making i equal to 1, i belongs to [1, N ], wherein N is the number of FFT points;

a5, comparison X_FFT(i) And X_{move_FFT}(i) The power difference between the two is recorded as:

P_f(i)＝X_FFT(i)-X_{move_FFT}(i)；

wherein, X_FFT(i) Represents X_FFT(k) I.e. X_FFT(k) A signal at frequency point i; x_{move_FFT}(i) Represents X_{move_FFT}(k) I.e. X_{move_FFT}(k) A signal at frequency point i;

a6, if P_f(i)＞P_{gate_f}And X_FFT(i)＞P_floorThen judging the signal X on the frequency point i_FFT(i) Is a stray signal, otherwise, judges the signal X on the frequency point i_FFT(i) Is not a spurious signal, where P_{gate_f}As a spurious decision threshold, P_floorIs the noise floor power;

a7, i is increased by 1, if the increased i is more than N, the step jumps to A8, otherwise, the step jumps to A5;

a8, judging according to A6, and adding X_FFT(k) All the spurious signals in the signal are set to be 0, and the signal after the 0 is recorded to be X_{FFT_0}(k)。

The power diversity syndrome step comprises:

b1, defining the signal collected by the second A/D converter as power back-off signal x_p(n)；

B2 transforming x by fast Fourier transform_p(n) transforming to frequency domain, recording the frequency domain signal as X_{p_FFT}(k)；

B3, making i equal to 1, and i ∈ [1, N ], where N is the number of FFT points;

b4, comparison X_{FFT_0}(i) And X_{p_FFT}(i) The power difference between the two is recorded as:

P_p(i)＝X_{FFT_0}(i)-X_{p_FFT}(i)；

wherein, X_{FFT_0}(i) Represents X_{FFT_0}(k) I.e. X_{FFT_0}(k) A signal at frequency point i; x_{p_FFT}(i) Represents X_{p_FFT}(k) I.e. X_{p_FFT}(k) A signal at frequency point i;

b5, if P_p(i)＞P_{gate_p}And X_{FFT_0}(i)＞P_floorThen judging the signal X on the frequency point i_{FFT_0}(i) Is a stray signal, otherwise, judges the signal X on the frequency point i_{FFT_0}(i) Is not a spurious signal, where P_{gate_p}As a spurious decision threshold, P_floorIs the noise floor power;

a6, i is increased by 1, if the increased i is more than N, the operation jumps to B7, otherwise, the operation jumps to B4;

b7, judging according to B5, and converting X_{FFT_0}(k) All the spurious signals in the signal are set to be 0, and the signal after the 0 is recorded to be X_correct(k)。

B8, converting the corrected frequency domain signal X by inverse fast Fourier transform_correct(k) Converted back to the time domain, the time domain signal being

The invention has the beneficial effects that: the invention can effectively suppress the nonlinear stray generated by the analog-to-digital converter in the digital domain. And the radio frequency front-end circuit does not need to be greatly modified, so that the existing receiver is convenient to upgrade and reform.

Drawings

FIG. 1 is a diagram illustrating spurious-free dynamic range;

FIG. 2 is a schematic diagram of the apparatus of the present invention;

FIG. 3 is a schematic diagram of an SFDR correction unit;

FIG. 4 is a flow chart of a method of the present invention;

in the figure, 1-a first receiving antenna, 2-a first mixer, 3-a first analog-to-digital converter, 4-SFDR correction unit, 5-a second receiving antenna, 6-attenuator, 7-a second mixer, 8-a second analog-to-digital converter, 9-a first phase-locked loop, 10-a local oscillator, 11-a second phase-locked loop, 12-a third receiving antenna, 13-a third mixer, 14-a third analog-to-digital converter.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

As shown in fig. 2, a signal receiving apparatus with high spurious-free dynamic range includes a first receiving antenna 1, a second receiving antenna 5, a third receiving antenna 12, a first mixer 2, a second mixer 7, a third mixer 13, a local oscillator 10, a first phase-locked loop 9, a second phase-locked loop 11, and an SFDR correcting unit 4;

the output end of the first receiving antenna 1 is connected with the first input end of the first mixer 2; the output end of the second receiving antenna 2 is connected with the first input end of a second mixer 7 through an attenuator 6; the output end of the third receiving antenna 12 is connected with the first input end of the third mixer 13; the output end of the local oscillator 10 is connected with a first phase-locked loop 9 and a second phase-locked loop 10, the output end of the first phase-locked loop 9 is connected with the second input end of the first frequency mixer 2 and the second input end of the second frequency mixer 7, and the output end of the second phase-locked loop 11 is connected with the second input end of the third frequency mixer 13; the output end of the first mixer 2 is connected with an SFDR correction unit 4 through a first analog-to-digital converter 3; the output end of the second mixer 7 is connected with the SFDR correction unit 4 through a second analog-to-digital converter 8; the output of the third mixer 13 is connected to the SFDR correction unit 4 through the third analog-to-digital converter 14, and the SFDR correction unit 4 is configured to suppress the nonlinear spurs of the received signal and output a correction signal with a high SFDR value.

As shown in fig. 3, the SFDR correction unit 4 includes:

the frequency diversity correction module is used for performing frequency diversity identification on the spurious signals in the frequency spectrum according to the signals output by the first analog-to-digital converter 3 and the third analog-to-digital converter 14, and setting the spurious signals in the frequency spectrum to zero to realize correction;

and the power diversity correction module is used for performing power diversity identification on the spurious signals in the frequency spectrum according to the signals output by the first analog-to-digital converter 3 and the second analog-to-digital converter 8, and setting the spurious signals in the frequency spectrum to zero to realize correction.

As shown in fig. 4, a signal receiving method with high spurious-free dynamic range includes the following steps:

s1, configuring a first phase-locked loop 9 and a second phase-locked loop 11 to enable the first phase-locked loop and the second phase-locked loop to generate different frequencies;

s2, the first receiving antenna 1, the second receiving antenna 5 and the third receiving antenna 12 receive signals of the same;

s3, transmitting the signal received by the first receiving antenna 1 to the first mixer 2 for down-conversion, and transmitting the obtained signal to the SFDR correction unit 4 through the first analog-to-digital converter 3;

s4, after passing through an attenuator 6, the signal received by the second receiving antenna 5 is transmitted to a second mixer 7 for down-conversion, and the obtained signal is transmitted to the SFDR correction unit 4 through a second analog-to-digital converter 8;

s5, transmitting the signal received by the third receiving antenna 12 to a third mixer 13 for down-conversion, and transmitting the obtained signal to the SFDR correction unit 4 through a third analog-to-digital converter 14;

and S6, the SFDR correction unit 4 performs nonlinear spurious suppression according to the received signal, and obtains a correction signal with a high SFDR value to output the correction signal.

The step S6 includes a frequency diversity correction sub-step and a power diversity correction sub-step, the frequency diversity correction sub-step includes:

a1, defining the signal output by the first analog-to-digital converter 3 as the main signal x (n), and the signal output by the third analog-to-digital converter 14 as the frequency offset signal x_f(n)；

A2, converting x (n) and x by fast Fourier transform_f(n) transforming to frequency domain, recording the frequency domain signal as X_FFT(k) And X_{f_FFT}(k)；

A3, mixing X_{f_FFT}(k) The point in (1) is integrally translated by n points to become X_{move_FFT}(k) So that X is_FFT(k) And X_{move_FFT}(k) The large signals in the middle are at the same frequency;

a4, making i equal to 1, i belongs to [1, N ], wherein N is the number of FFT points;

a5, comparison X_FFT(i) And X_{move_FFT}(i) The power difference between the two is recorded as:

P_f(i)＝X_FFT(i)-X_{move_FFT}(i)；

wherein, X_FFT(i) Represents X_FFT(k) I.e. X_FFT(k) A signal at frequency point i; x_{move_FFT}(i) Represents X_{move_FFT}(k) I.e. X_{move_FFT}(k) A signal at frequency point i;

a6, if P_f(i)＞P_{gate_f}And X_FFT(i)＞P_floorThen judging the signal X on the frequency point i_FFT(i) Is a stray signal, otherwise, judges the signal X on the frequency point i_FFT(i) Is not a spurious signal, where P_{gate_f}As a spurious decision threshold, P_floorIs the noise floor power;

a7, i is increased by 1, if the increased i is more than N, the step jumps to A8, otherwise, the step jumps to A5;

a8, judging according to A6, and adding X_FFT(k) All the spurious signals in the signal are set to be 0, and the signal after the 0 is recorded to be X_{FFT_0}(k)。

The power diversity syndrome step comprises:

b1, defining the signal collected by the second A/D converter 8 as the power back-off signal x_p(n)；

B2 transforming x by fast Fourier transform_p(n) transforming to frequency domain, recording the frequency domain signal as X_{p_FFT}(k)；

B3, making i equal to 1, and i ∈ [1, N ], where N is the number of FFT points;

b4, comparison X_{FFT_0}(i) And X_{p_FFT}(i) The power difference between the two is recorded as:

P_p(i)＝X_{FFT_0}(i)-X_{p_FFT}(i)；

wherein, X_{FFT_0}(i) Represents X_{FFT_0}(k) I.e. X_{FFT_0}(k) A signal at frequency point i; x_{p_FFT}(i) Represents X_{p_FFT}(k) I.e. X_{p_FFT}(k) A signal at frequency point i;

b5, if P_p(i)＞P_{gate_p}And X_{FFT_0}(i)＞P_floorThen judging the signal X on the frequency point i_{FFT_0}(i) Is a stray signal, otherwise, judges the signal X on the frequency point i_{FFT_0}(i) Is not a spurious signal, where P_{gate_p}As a spurious decision threshold, P_floorIs the noise floor power;

a6, i is increased by 1, if the increased i is more than N, the operation jumps to B7, otherwise, the operation jumps to B4;

b7, judging according to B5, and converting X_{FFT_0}(k) All the spurious signals in the signal are set to be 0, and the signal after the 0 is recorded to be X_correct(k)。

The foregoing is a preferred embodiment of the present invention, it is to be understood that the invention is not limited to the form disclosed herein, but is not to be construed as excluding other embodiments, and is capable of other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.