A method and apparatus for transmit local oscillator leakage correction for a zero intermediate frequency system

Abstract

The application discloses a transmitting local oscillator leakage correction method for a zero intermediate frequency system, which comprises the following steps: obtaining a first direct current bias signal of a zero intermediate frequency receiver according to a first positive signal and a first negative signal sent by a zero intermediate frequency transmitter; obtaining an amplitude attenuation parameter alpha and a phase deviation parameter of a second positive signal between the zero intermediate frequency receiver and the zero intermediate frequency transmitter according to the first direct current bias signal and the second positive signal, wherein the second positive signal is obtained by applying a strong direct current signal to an I path of the zero intermediate frequency transmitter; obtaining a second direct current bias signal based on the amplitude attenuation parameter alpha and the phase deviation parameter; superimposing a third direct current bias signal opposite to the second direct current bias signal on the zero intermediate frequency transmitter to complete the correction of the transmitting local oscillator leakage. Compared with the prior art, the application uses a relatively simple algorithm to solve the transmitting local oscillator leakage problem in the zero intermediate frequency transceiver, saves time and hardware resources, and can be used for the initialization correction and tracking correction of the transmitting local oscillator leakage.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and specifically to a method and apparatus for correcting transmit local oscillator leakage in zero intermediate frequency systems. Background Technology

[0002] Software-defined radio (SDR), as an emerging technology, has been widely applied in the field of wireless communication. Some fully integrated SDR RF transceiver chips adopt a zero-IF architecture, which has advantages in terms of cost, size, and power consumption. However, as the integration of zero-IF chips increases, some problems with this structure are becoming more prominent, one of which is the transmit local oscillator leakage caused by the coupling between the local oscillator signal and the front-end devices.

[0003] In zero-IF architectures, local oscillator leakage is unavoidable. It is very close to or even within the desired signal frequency band, making it difficult or impossible to remove through filtering, as filtering also removes the desired signal. Uncorrected transmit local oscillator leakage will generate unwanted transmissions within the required transmission range, thereby degrading the signal-to-noise ratio of the transmitted signal, consuming transmit signal power, and reducing system performance.

[0004] Currently, the main approach to zero-IF local oscillator (LO) leakage is to estimate and compensate for transmitter LO leakage using the feedback path. This method estimates and corrects transmitter LO leakage by measuring the DC component in the receiving path, measuring the phase difference between the received LO signal and the LO signal from the zero-IF receiver, and filtering the LO harmonics generated by the nonlinear mixer. This method can achieve initial and tracking correction of transmitter LO leakage with very good correction accuracy. However, this method is complex in analyzing the gain attenuation and phase deviation between the zero-IF receiver and the zero-IF transmitter, requiring significant time and hardware resources. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the present invention provides a method and apparatus for transmitting local oscillator leakage correction in zero intermediate frequency systems to solve the above-mentioned technical problems.

[0006] This invention provides a transmit local oscillator leakage correction method for zero intermediate frequency (IF) systems, used in zero IF transceivers. The correction method includes:

[0007] The first DC bias signal of the zero-IF receiver is obtained based on the first positive signal and the first negative signal sent by the zero-IF transmitter;

[0008] Based on the first DC bias signal and the second positive signal, the amplitude attenuation parameter α and the phase deviation parameter between the zero-IF receiver and the zero-IF transmitter are obtained. The second positive signal is obtained by applying an enhanced DC signal to the I channel of the zero-IF transmitter;

[0009] Based on the amplitude attenuation parameter α and the phase deviation parameter The second DC bias signal is obtained;

[0010] A third DC bias signal, which is opposite to the second DC bias signal, is superimposed on the zero-IF transmitter to complete the correction of the transmission local oscillator leakage.

[0011] In one embodiment of the present invention, the first DC bias signal includes a first I-channel DC bias signal and a first Q-channel DC bias signal, and the second DC bias signal includes a second I-channel DC bias signal and a second Q-channel DC bias signal. The first DC bias signal is represented as follows:

[0012]

[0013]

[0014]

[0015] Among them, RX I (n) represents the first I-channel DC bias signal, RX Q (n) represents the first Q-channel DC bias signal, D 1I (n) represents the first negative I-channel signal, D 1Q (n) represents the first negative Q-path signal, D 2I (n) represents the first positive I-path signal, D 2Q (n) represents the first positive Q-path signal, I T (n) represents the second I-channel DC bias signal, Q T (n) represents the second Q-channel DC bias signal.

[0016] In one embodiment of the present invention, the second positive signal includes a second positive I-channel signal and a second positive Q-channel signal, and the step of applying a strong DC signal to the I-channel of the zero-IF transmitter to obtain the second positive signal includes:

[0017] The strong DC signal is superimposed on the first I-channel DC bias signal and the first Q-channel DC bias signal to obtain the second positive I-channel signal and the second positive Q-channel signal; wherein, the second positive signal is represented as:

[0018]

[0019] Among them, D LA (n) represents the second positive I-path signal, D QA(n) represents the second positive Q-channel signal, and α represents the gain attenuation parameter between the zero-IF receiver and the zero-IF transmitter. This indicates the phase deviation between the zero-IF receiver and the zero-IF transmitter, where A represents a strong DC signal.

[0020] In one embodiment of the present invention, the amplitude attenuation parameter α is expressed as:

[0021]

[0022] The phase deviation parameter Represented as:

[0023]

[0024] In one embodiment of the present invention, the second DC bias signal is represented as:

[0025]

[0026] This invention provides a transmit local oscillator leakage correction device for a zero intermediate frequency system, the correction device comprising:

[0027] The DC bias signal calculation module is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal sent by the zero-IF transmitter.

[0028] The signal parameter calculation module is used to obtain the amplitude attenuation parameter α and phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained; wherein the second positive signal is obtained by applying an enhanced DC signal to the I-channel of the zero-IF transmitter;

[0029] The signal compensation module superimposes a third DC bias signal, which is opposite to the second DC bias signal, onto the zero-IF transmitter to correct the leakage of the local oscillator.

[0030] In one embodiment of the present invention, the calibration device further includes:

[0031] The register module is used to store the first DC bias signal, the amplitude attenuation parameter α, and the phase deviation parameter. And strong DC signals.

[0032] The present invention provides a zero-IF transceiver, comprising a zero-IF receiver and a zero-IF transmitter, wherein the zero-IF transceiver further comprises:

[0033] The feedback module is used to process the signal transmitted by the zero-IF transmitter to obtain a first positive signal and a first negative signal;

[0034] The correction module is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal transmitted by the zero-IF receiver, and to obtain the amplitude attenuation parameter α and the phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained, and a third DC bias signal opposite to the second DC bias signal is superimposed on the zero-IF transmitter to complete the correction of the transmission local oscillator leakage; wherein, the second positive signal is obtained by applying a strong DC signal to the I channel of the zero-IF transmitter.

[0035] In one embodiment of the present invention, the correction module includes:

[0036] The observation submodule is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal sent by the zero-IF receiver;

[0037] The calculation submodule is used to obtain the amplitude attenuation parameter α and phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained; wherein the second positive signal is obtained by applying an enhanced DC signal to the I-channel of the zero-IF transmitter;

[0038] The compensation submodule superimposes a third DC bias signal, which is opposite to the second DC bias signal, onto the zero-IF transmitter to correct the transmission local oscillator leakage.

[0039] In one embodiment of the present invention, the feedback module includes:

[0040] An inverter is used to invert the signal transmitted by the zero-IF transmitter.

[0041] The data selector includes a first operating state and a second operating state. When the data selector is in the first operating state, it outputs a first positive signal, and when the data selector is in the second operating state, it outputs a first negative signal.

[0042] A filter is used to filter out the harmonic components of the first positive signal and the first negative signal.

[0043] Beneficial effects of the present invention: A transmit local oscillator leakage correction method for a zero-IF system according to the present invention includes: obtaining a first DC bias signal of a zero-IF receiver based on a first positive signal and a first negative signal transmitted by a zero-IF transmitter; and obtaining an amplitude attenuation parameter α and a phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the first DC bias signal and a second positive signal. The second positive signal is obtained by applying an enhanced DC signal to the I-channel of the zero-IF transmitter; based on the amplitude attenuation parameter α and the phase deviation parameter. A second DC bias signal is obtained; a third DC bias signal, opposite to the second DC bias signal, is superimposed on the zero-IF transmitter to complete the correction of transmit local oscillator leakage. Compared with the prior art, the present invention uses a simpler algorithm to solve the transmit local oscillator leakage problem in zero-IF transceivers, saving time and hardware resources, and can be used for initialization correction and tracking correction of transmit local oscillator leakage.

[0044] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0046] Figure 1 This is a schematic diagram illustrating a transmit local oscillator leakage correction method for a zero intermediate frequency system, as an exemplary embodiment of this application.

[0047] Figure 2 A schematic block diagram of a feedback module as an exemplary embodiment of this application;

[0048] Figure 3 This is a schematic block diagram of a transmit local oscillator leakage correction device for a zero intermediate frequency system, which is an exemplary embodiment of this application.

[0049] Figure 4 This is a schematic block diagram of a zero-IF transceiver as an exemplary embodiment of this application;

[0050] Figure 5 This is a schematic block diagram of a correction module according to an exemplary embodiment of this application. Detailed Implementation

[0051] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0052] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0053] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0054] Currently, the main approach to zero-IF local oscillator (LO) leakage is to estimate and compensate for transmitter LO leakage using the feedback path. This method estimates and corrects transmitter LO leakage by measuring the DC component in the receiving path, measuring the phase difference between the received LO signal and the receiver LO signal, and filtering the LO harmonics generated by the nonlinear mixer. This method can achieve initial and tracking correction of transmitter LO leakage with very good correction accuracy. However, this method is complex in analyzing gain attenuation and phase deviation between the receiving and transmitting links, requiring significant time and hardware resources.

[0055] To address the local oscillator leakage problem at the transmitter end of zero-IF transceivers, this invention provides a correction algorithm based on existing technology. This algorithm accurately estimates the amplitude attenuation parameter α and phase deviation parameter between the transmitter and receiver by applying a strong DC signal to the transmitter's I-channel signal. Then, the local oscillator leakage values ​​of the I and Q transmitters are calculated, and finally, a negative local oscillator leakage value is input at the transmitter to complete the correction of the local oscillator leakage at the transmitter.

[0056] Please see Figure 1 , Figure 1 This is a schematic block diagram illustrating a transmit local oscillator leakage correction method for a zero-IF system, as an exemplary embodiment of this application. The correction method is used in a zero-IF transceiver. Figure 1 As shown, the correction method includes steps S110-S140:

[0057] Step S110: Obtain the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal sent by the zero-IF transmitter;

[0058] In one embodiment, the first DC bias signal includes a first I-channel DC bias signal and a first Q-channel DC bias signal, and the second DC bias signal includes a second I-channel DC bias signal and a second Q-channel DC bias signal. The first DC bias signal is represented as follows:

[0059]

[0060]

[0061]

[0062] Among them, RX I (n) represents the first I-channel DC bias signal, RX Q (n) represents the first Q-channel DC bias signal, D 1I (n) represents the first negative I-channel signal, D 1Q (n) represents the first negative Q-path signal, D 2I (n) represents the first positive I-path signal, D 2Q (n) represents the first positive Q-path signal, I T (n) represents the second I-channel DC bias signal, Q T (n) represents the second Q-channel DC bias signal.

[0063] It should be noted that the first DC bias signal is the receiver's own DC bias, and the first positive signal and the first negative signal can be obtained through methods such as... Figure 2 The feedback module shown is obtained. Figure 2 In this module, the feedback module processes the signal transmitted by the zero-IF transmitter to obtain a first positive signal and a first negative signal. The feedback module includes:

[0064] Inverter 210 is used to invert the signal transmitted by the zero intermediate frequency transmitter;

[0065] The data selector 220 includes a first operating state and a second operating state. When the data selector is in the first operating state, it outputs a first positive signal, and when the data selector is in the second operating state, it outputs a first negative signal.

[0066] Filter 230 is used to filter out the harmonic components of the first positive signal and the first negative signal.

[0067] The specific workflow of the feedback module is as follows:

[0068] 1. Set the data selector in the feedback module to en = 0. At this time, the data selector is in the first working state and outputs the first positive signal, which includes the first positive I-channel signal D. 1I (n) and the first positive Q-path signal D 1Q (n);

[0069] 2. Set the data selector in the feedback module to en = 1 and keep it unchanged. At this time, the data selector is in the second working state and outputs the first negative signal, which includes the first negative I-channel signal D. 1I (n) and the first negative Q-path signal D 1Q (n).

[0070] Step S120: Based on the first DC bias signal and the second positive signal, obtain the amplitude attenuation parameter α and the phase deviation parameter between the zero-IF receiver and the zero-IF transmitter. The second positive signal is obtained by applying an enhanced DC signal to the I channel of the zero-IF transmitter;

[0071] After obtaining the first positive signal and the first negative signal, a strong DC signal A (which is known) is applied to the I channel of the transmitter, while no strong DC signal is applied to the Q channel, thereby obtaining the second positive signal.

[0072] Specifically, the second positive signal includes a second positive I-channel signal and a second positive Q-channel signal. The step of applying a strong DC signal to the I-channel of the zero-IF transmitter to obtain the second positive signal includes:

[0073] The strong DC signal is superimposed on the first I-channel DC bias signal and the first Q-channel DC bias signal to obtain the second positive I-channel signal and the second positive Q-channel signal; wherein, the second positive signal is represented as:

[0074]

[0075] Among them, D IA (n) represents the second positive I-path signal, D QA (n) represents the second positive Q-channel signal, and α represents the gain attenuation parameter between the zero-IF receiver and the zero-IF transmitter. This indicates the phase deviation between the zero-IF receiver and the zero-IF transmitter, where A represents a strong DC signal.

[0076] The amplitude attenuation parameter α is expressed as:

[0077]

[0078] The phase deviation parameter Represented as:

[0079]

[0080] Step S130, based on the amplitude attenuation parameter α and the phase deviation parameter The second DC bias signal is obtained; the second DC bias signal is expressed as:

[0081]

[0082] Step S140: A third DC bias signal, which is opposite to the second DC bias signal, is superimposed on the zero-IF transmitter to complete the correction of the transmission local oscillator leakage.

[0083] After obtaining I T (n) and Q T After specifying the value of (n), a negative bias signal, -I, is sent at the transmitter. T (n) and -Q T (n) thereby achieving the cancellation of the signal bias caused by the local oscillator leakage at the transmitting end, and completing the correction of the local oscillator leakage.

[0084] In one embodiment, before acquiring the first positive signal and the first negative signal, the circuit is initialized so that the baseband digital module of the transmitter does not transmit any valid signal.

[0085] This invention accurately estimates the amplitude attenuation parameter α and phase deviation parameter between the transmitter and receiver by applying a strong DC signal to the I-channel signal of the transmitter. Then, the local oscillator leakage values ​​of the I and Q transmitters are calculated, and finally, a negative local oscillator leakage value is input at the transmitter to complete the correction of the local oscillator leakage at the transmitter.

[0086] This invention optimizes existing technologies by using a simpler algorithm to solve the transmit local oscillator leakage problem in zero-IF transceivers, thereby optimizing timing and simplifying the circuit. It also saves time and hardware resources and can be used for initialization and tracking correction of transmit local oscillator leakage.

[0087] Please see Figure 3 , Figure 3 This is a schematic block diagram of a transmit local oscillator leakage correction device for a zero intermediate frequency system, as an exemplary embodiment of this application. The correction device includes:

[0088] The DC bias signal calculation module 310 is used to calculate the first DC bias signal of the zero intermediate frequency receiver based on the first positive signal and the first negative signal sent by the zero intermediate frequency transmitter.

[0089] The signal parameter calculation module 320 is used to obtain the amplitude attenuation parameter α and phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained; wherein the second positive signal is obtained by applying an enhanced DC signal to the I-channel of the zero-IF transmitter;

[0090] The signal compensation module 330 superimposes a third DC bias signal, which is opposite to the second DC bias signal, onto the zero-IF transmitter to complete the correction of the transmission local oscillator leakage.

[0091] In one embodiment, the first DC bias signal includes a first I-channel DC bias signal and a first Q-channel DC bias signal, and the second DC bias signal includes a second I-channel DC bias signal and a second Q-channel DC bias signal. The first DC bias signal is represented as follows:

[0092]

[0093]

[0094]

[0095] Among them, RX I (n) represents the first I-channel DC bias signal, RX Q (n) represents the first Q-channel DC bias signal, D 1I (n) represents the first negative I-channel signal, D 1Q (n) represents the first negative Q-path signal, D 2I (n) represents the first positive I-path signal, D 2Q (n) represents the first positive Q-path signal, I T (n) represents the second I-channel DC bias signal, Q T (n) represents the second Q-channel DC bias signal.

[0096] In one embodiment, the step of acquiring the second positive signal includes:

[0097] The strong DC signal is superimposed on the first I-channel DC bias signal and the first Q-channel DC bias signal to obtain the second positive I-channel signal and the second positive Q-channel signal; wherein, the second positive signal is represented as:

[0098]

[0099] Among them, D LA (n) represents the second positive I-path signal, DQA (n) represents the second positive Q-channel signal, and α represents the gain attenuation parameter between the zero-IF receiver and the zero-IF transmitter. This indicates the phase deviation between the zero-IF receiver and the zero-IF transmitter, where A represents a strong DC signal.

[0100] In one embodiment, the amplitude attenuation parameter α is expressed as:

[0101]

[0102] The phase deviation parameter Represented as:

[0103]

[0104] In one embodiment, the second DC bias signal is represented as:

[0105]

[0106] In one embodiment, the calibration device further includes:

[0107] The register module is used to store the first DC bias signal, the amplitude attenuation parameter α, and the phase deviation parameter. And strong DC signals.

[0108] It should be noted that the calibration device and the calibration method provided in the above embodiments belong to the same concept. The specific ways in which each module and unit performs its operation have been described in detail in the method embodiments and will not be repeated here. In practical applications, the calibration device provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0109] Please see Figure 4 , Figure 4 This is a schematic block diagram of a zero-IF transceiver, an exemplary embodiment of this application. The zero-IF transceiver includes a zero-IF receiver and a zero-IF transmitter, and further includes:

[0110] The feedback module is used to process the signal transmitted by the zero-IF transmitter to obtain a first positive signal and a first negative signal;

[0111] The correction module is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal transmitted by the zero-IF receiver, and to obtain the amplitude attenuation parameter α and the phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained, and a third DC bias signal opposite to the second DC bias signal is superimposed on the zero-IF transmitter to complete the correction of the transmission local oscillator leakage; wherein, the second positive signal is obtained by applying a strong DC signal to the I channel of the zero-IF transmitter.

[0112] Please see Figure 5 , Figure 5 This is a schematic block diagram of a correction module according to an exemplary embodiment of this application. Figure 5 In this context, the correction module includes:

[0113] The observation submodule is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal sent by the zero-IF receiver;

[0114] The calculation submodule is used to obtain the amplitude attenuation parameter α and phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained; wherein the second positive signal is obtained by applying an enhanced DC signal to the I-channel of the zero-IF transmitter;

[0115] The compensation submodule superimposes a third DC bias signal, which is opposite to the second DC bias signal, onto the zero-IF transmitter to correct the leakage of the local oscillator.

[0116] It should be noted that the intermediate frequency transceiver provided in the above embodiments and the calibration method / calibration device provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the intermediate frequency transceiver provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0117] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for correcting transmit local oscillator leakage in a zero-IF system, used in a zero-IF transceiver, characterized in that, The correction method includes: The first DC bias signal of the zero-IF receiver is obtained based on the first positive signal and the first negative signal sent by the zero-IF transmitter; Based on the first DC bias signal and the second positive signal, the amplitude attenuation parameter α and the phase deviation parameter between the zero-IF receiver and the zero-IF transmitter are obtained. The second positive signal is obtained by applying an enhanced DC signal to the I channel of the zero-IF transmitter; Based on the amplitude attenuation parameter α and the phase deviation parameter The second DC bias signal is obtained; A third DC bias signal, which is opposite to the second DC bias signal, is superimposed on the zero-IF transmitter to complete the correction of the transmission local oscillator leakage.

2. The transmit local oscillator leakage correction method for zero intermediate frequency systems according to claim 1, characterized in that, The first DC bias signal includes a first I-channel DC bias signal and a first Q-channel DC bias signal, and the second DC bias signal includes a second I-channel DC bias signal and a second Q-channel DC bias signal. The first DC bias signal is represented as follows: Among them, RX I (n) represents the first I-channel DC bias signal, RX Q (n) represents the first Q-channel DC bias signal, D 1I (n) represents the first negative I-channel signal, D 1Q (n) represents the first negative Q-path signal, D 2I (n) represents the first positive I-path signal, D 2Q (n) represents the first positive Q-path signal, I T (n) represents the second I-channel DC bias signal, Q T (n) represents the second Q-channel DC bias signal.

3. The transmit local oscillator leakage correction method for a zero intermediate frequency system according to claim 2, characterized in that, The second positive signal includes a second positive I-channel signal and a second positive Q-channel signal. The step of applying a strong DC signal to the I-channel of the zero-IF transmitter to obtain the second positive signal includes: The strong DC signal is superimposed on the first I-channel DC bias signal and the first Q-channel DC bias signal to obtain the second positive I-channel signal and the second positive Q-channel signal; wherein, the second positive signal is represented as: Among them, D IA (n) represents the second positive I-path signal, D QA (n) represents the second positive Q-channel signal, and α represents the gain attenuation parameter between the zero-IF receiver and the zero-IF transmitter. This represents the phase deviation parameter between the zero-IF receiver and the zero-IF transmitter, where A represents a strong DC signal.

4. The transmit local oscillator leakage correction method for a zero intermediate frequency system according to claim 3, characterized in that, The amplitude attenuation parameter α is expressed as: The phase deviation parameter Represented as:

5. The transmit local oscillator leakage correction method for a zero intermediate frequency system according to claim 4, characterized in that, The second DC bias signal is represented as follows:

6. A transmit local oscillator leakage correction device for a zero intermediate frequency (IF) system, used in a zero IF transceiver, characterized in that, The correction device includes: The DC bias signal calculation module is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal sent by the zero-IF transmitter. The signal parameter calculation module is used to obtain the amplitude attenuation parameter α and phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained; wherein the second positive signal is obtained by applying an enhanced DC signal to the I-channel of the zero-IF transmitter; The signal compensation module superimposes a third DC bias signal, which is opposite to the second DC bias signal, onto the zero-IF transmitter to correct the transmission local oscillator leakage.

7. The transmit local oscillator leakage correction device for a zero intermediate frequency system according to claim 6, characterized in that, The correction device further includes: The register module is used to store the first DC bias signal, the amplitude attenuation parameter α, and the phase deviation parameter. And strong DC signals.

8. A zero-IF transceiver, comprising a zero-IF receiver and a zero-IF transmitter, characterized in that, The zero-IF transceiver also includes: The feedback module is used to process the signal transmitted by the zero-IF transmitter to obtain a first positive signal and a first negative signal; The correction module is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal transmitted by the zero-IF receiver, and to obtain the amplitude attenuation parameter α and the phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. Based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained, and a third DC bias signal opposite to the second DC bias signal is superimposed on the zero-IF transmitter to complete the correction of the transmission local oscillator leakage; wherein, the second positive signal is obtained by applying a strong DC signal to the I channel of the zero-IF transmitter.

9. The zero-IF transceiver according to claim 8, characterized in that, The correction module includes: The observation submodule is used to calculate the first DC bias signal of the zero-IF receiver based on the first positive signal and the first negative signal sent by the zero-IF receiver; The calculation submodule is used to obtain the amplitude attenuation parameter α and phase deviation parameter between the zero-IF receiver and the zero-IF transmitter based on the second positive signal and the first DC bias signal. And based on the amplitude attenuation parameter α and the phase deviation parameter A second DC bias signal is obtained; wherein the second positive signal is obtained by applying an enhanced DC signal to the I-channel of the zero-IF transmitter; The compensation submodule superimposes a third DC bias signal, which is opposite to the second DC bias signal, onto the zero-IF transmitter to correct the leakage of the local oscillator.

10. The zero-IF transceiver according to claim 8, characterized in that, The feedback module includes: An inverter is used to invert the signal transmitted by the zero-IF transmitter. The data selector includes a first operating state and a second operating state. When the data selector is in the first operating state, it outputs a first positive signal, and when the data selector is in the second operating state, it outputs a first negative signal. A filter is used to filter out the harmonic components of the first positive signal and the first negative signal.

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