Modem mismatch detection and optimization device and detection and calibration method

Abstract

The present disclosure provides a detection and optimization device for modem mismatch and a detection and calibration method. The modem mismatch detection device includes a switching module arranged between the transmitting module end and the receiving module end of the modem; also includes a first transmitting end and a second transmitting end; a first receiving end and a second receiving end; the switching module in the first state is configured to transmit the signal of the first transmitting end to the first receiving end, and transmit the signal of the second transmitting end to the second receiving end; the switching module in the second state is configured to transmit the signal of the first transmitting end to the second receiving end, and transmit the signal of the second transmitting end to the first receiving end. In addition, a modem mismatch optimization device, as well as a modem mismatch detection method and calibration method are also disclosed. The present disclosure can use the modules of the original modem to extract the key parameters of the mismatch, and improve the signal quality by compensating for the mismatch.

Description

Technical Field

[0001] The present disclosure relates to the field of radio frequency transceiver mismatch calibration, and in particular to a modem mismatch detection and optimization device and a detection and calibration method. Background Art

[0002] Currently, there are process deviation fluctuations in the production process of integrated devices, and mismatches exist in the modems used in the signal path, which, for example, may lead to a deterioration in the transmission and reception signal-to-noise ratios, affecting the performance of modulation and demodulation.

[0003] For example, when this mismatch caused by process variations occurs within the analog baseband circuitry of a modem, such as the transmit / receive filters and transmit / receive A / D and D / A converters, it can have a significant impact on high-speed, high-precision, broadband systems. This manifests itself as amplitude mismatch in the orthogonal signals and phase mismatch in the quadrature signals. These two types of mismatch typically have both static components and frequency-varying components.

[0004] Of course, actual parameters and characteristics can change with factors such as temperature, aging, impedance, and power supply. Often, if calibration parameters do not keep pace with these changes, the quality of the transmitted signal will deteriorate, making demodulation difficult at the air interface receiver, thereby reducing system throughput. The same applies to parameter mismatch at the receiver. Therefore, detecting and calibrating the amplitude and phase mismatch between the transmitted and received signals is essential.

[0005] Solutions to partial mismatch in the analog baseband require either the use of external instruments plus internal non-volatile programmable devices, which have high implementation and testing costs and poor adaptability to changes in environmental factors such as temperature; or the addition of additional complex circuits, which have high implementation costs, poor detection accuracy, and low detection efficiency; or the phase shift operation has errors in implementation, thereby limiting detection accuracy; or the mismatch detection quantities of RF and analog baseband are mixed together, resulting in poor overall mismatch detection accuracy within the passband.

[0006] Therefore, the existing technology needs to be improved and enhanced. In addition, it should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of this application and facilitating the understanding of those skilled in the art. It should not be assumed that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of this application. Summary of the Invention

[0007] In order to solve at least one of the above problems and one or more of other potential problems, the present disclosure proposes a modem mismatch detection device and its detection and calibration method, which only requires the internal setting of switching modules with different working states and signal transmission modes in different states. It can borrow the modules of the original modem to extract the key parameters of the mismatch and improve the signal quality by compensating for the mismatch.

[0008] In a first aspect of the present disclosure, a modem mismatch detection device is provided, wherein the detection device includes a switching module arranged between the transmitting module end and the receiving module end of the modem; the transmitting module end includes a transmitting output end, and the transmitting output end includes a first transmitting end and a second transmitting end; the receiving module end includes a receiving input end, and the receiving input end includes a first receiving end and a second receiving end; the switching module includes a first state and a second state, and the switching module in the first state is configured to transmit a signal from the first transmitting end to the first receiving end, and transmit a signal from the second transmitting end to the second receiving end; the switching module in the second state is configured to transmit a signal from the first transmitting end to the second receiving end, and transmit a signal from the second transmitting end to the first receiving end.

[0009] Furthermore, in some embodiments, the above-mentioned transmitting module end is configured to send the signal from the transmitting digital baseband signal processing module, and pass through the digital-to-analog conversion module, the transmitting end filtering module, and the above-mentioned transmitting output end in sequence; the above-mentioned transmitting digital baseband signal processing module includes a first digital transmitting end and a second digital transmitting end; the above-mentioned receiving module end is configured to receive the signal from the above-mentioned switching module from the above-mentioned receiving input end, and pass through the receiving end filtering module, the analog-to-digital conversion module, and the receiving digital baseband signal processing module in sequence; the above-mentioned receiving digital baseband signal processing module includes a first digital receiving end and a second digital receiving end.

[0010] Further, in some embodiments, when the first digital transmitting end sends out the first digital signal I and the second digital transmitting end sends out the second digital signal Q, so that the first digital signal I and the second digital signal Q satisfy the complex signal relationship S1=I+jQ, the switching module is set to the first state; when the first digital transmitting end sends out the second digital signal Q and the second digital transmitting end sends out the first digital signal I, so that the first digital signal I and the second digital signal Q satisfy the complex signal relationship S2=Q+jI, the switching module is set to the second state.

[0011] Furthermore, in some embodiments, the first digital transmitting end further includes a first digital transmitting P end and a first digital transmitting N end, and the first digital transmitting P end and the first digital transmitting N end are used to output paired differential signals; the second digital transmitting end further includes a second digital transmitting P end and a second digital transmitting N end, and the second digital transmitting P end and the second digital transmitting N end are used to output paired differential signals; the first transmitting end further includes a first transmitting P end and a first transmitting N end, and the first transmitting P end and the first transmitting N end are used to output paired differential signals; the second transmitting end further includes a second transmitting P end and a second transmitting N end, and the second transmitting P end and the second transmitting N end are used to output paired differential signals; the first receiving end further includes a first receiving P end and a first receiving N end, and the first receiving P end and the first receiving N end are used to receive paired differential signals; the second receiving end further includes a second receiving P end and a second receiving N end, and the second receiving P end and the second receiving N end are used to receive paired differential signals.

[0012] Further, in some embodiments, the switching module of the first state is configured to connect the first transmitting P end with the first receiving P end, connect the first transmitting N end with the first receiving N end, connect the second transmitting P end with the second receiving P end, and connect the second transmitting N end with the second receiving N end; the switching module of the second state is configured to connect the second transmitting P end with the first receiving P end, connect the second transmitting N end with the first receiving N end, connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end.

[0013] Further, in some embodiments, the switching module further includes a third state, and the third state further includes a third A state and a third B state; the switching module of the third A state is configured to connect the second transmitting P end with the first receiving P end, connect the second transmitting N end with the first receiving N end, connect the first transmitting P end with the second receiving N end, and connect the first transmitting N end with the second receiving P end; the switching module of the third B state is configured to connect the second transmitting P end with the first receiving N end, connect the second transmitting N end with the first receiving P end, connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end.

[0014] Furthermore, in some embodiments, when the first digital transmitting end sends out a second digital negative signal -Q and the second digital transmitting end sends out a first digital signal I, so that the first digital signal I and the second digital negative signal -Q satisfy the complex signal relationship S3=-Q+jI, the switching module is set to the third state or the second state.

[0015] Furthermore, in some embodiments, when the first digital transmitting end sends out a second digital signal Q and the second digital transmitting end sends out a first digital negative signal -I, so that the first digital negative signal I and the second digital signal Q satisfy the complex signal relationship S4=Q-jI, the switching module is set to the third state or the second state.

[0016] In a second aspect of the present disclosure, a modem mismatch optimization device is provided, which includes the above-mentioned modem mismatch detection device; a one-stage or multi-stage equalizer is arranged between the above-mentioned modem's transmitting digital baseband signal processing module and the digital-to-analog conversion module, and between the above-mentioned modem's receiving digital baseband signal processing module and the analog-to-digital conversion module.

[0017] In a third aspect of the present disclosure, a method for detecting modem mismatch is provided, comprising:

[0018] Determine the output signal I transmitted by the transmit digital baseband signal processing module of the above-mentioned modem TX.BB and Q TX.BB , and satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ;

[0019] Determine the above signal I TX.BB and Q TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the above-mentioned modem, it is converted into an output signal I TX.FLT and Q TX.FLT , the above signal I TX.FLT and Q TX.FLT Output from the output end of the transmitting module, and satisfy the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT ;

[0020] Determine that the receiving module end of the above-mentioned modem inputs the signal I from the output end of the above-mentioned transmitting module end RX.FLT.in and Q RX.FLT.in , and satisfy the complex signal relationship

[0021] S RX.FLT.in =IRX.FLT.in +jQ RX.FLT.in =S TX.FLT ;

[0022] Determine the above signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion inside the receiving module of the above-mentioned modem, it is converted into a signal I RX.BB and Q RX.BB , and satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB , the above signal I RX.BB and Q RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the above-mentioned modem;

[0023] Adjust and determine the output signal I' transmitted by the transmit digital baseband signal processing module of the above-mentioned modem TX.BB and Q' TX.BB , and satisfy the complex signal relationship

[0024] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB ;

[0025] Determine the above signal I' TX.BB and Q' TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal I' TX.FLT and Q' TX.FLT , and the above signal I' TX.FLT and Q' TX.FLT Output from the output end of the transmitting module, and satisfy the complex signal relationship S' TX.FLT =I' TX.FLT +jQ' TX.FLT ;

[0026] Determine that the receiving module end of the above-mentioned modem inputs the output signal I' from the output end of the above-mentioned transmitting module end RX.FLT.in and Q' RX.FLT.in , which satisfies the complex signal relation

[0027] S' RX.FLT.in =I' RX.FLT.in +jQ' RX.FLT.in =jS'* TX.FLT =Q' TX.FLT +jI' TX.FLT ;

[0028] Determine the above signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion inside the receiving module of the modem, it is converted into a signal I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , the above signal I' RX.BB and Q' RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the above-mentioned modem;

[0029] According to the signal I received by the receiving digital baseband signal processing module of the above-mentioned modem RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB To obtain the four mismatch parameters of baseband simulation mismatch.

[0030] Furthermore, in some embodiments, the above-mentioned modem mismatch detection method further includes:

[0031] The output signal I transmitted by the digital baseband signal processing module of the modem is TX.BB and Q TX.BB Satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB = ;

[0032] The above signal I TX.BB and Q TX.BB The output signal I is converted after digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the above-mentioned modem. TX.FLT and Q TX.FLT Satisfy the complex signal relationship

[0033] S TX.FLT =I TX.FLT +jQ TX.FLT = ,

[0034] Among them, K T It represents the gain after digital-to-analog conversion, filtering and gain adjustment sent by the above-mentioned transmitting digital baseband signal processing module, φ T Represents the phase delay after digital-to-analog conversion, filtering and gain adjustment sent by the above-mentioned transmit digital baseband signal processing module;

[0035] The receiving module of the modem inputs the signal I from the output end of the transmitting module.RX.FLT.in and Q RX.FLT.in Satisfies the complex signal relationship S RX.FLT.in =I RX.FLT.in +jQ RX.FLT.in =S TX.FLT ;

[0036] The above signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, the converted signal I RX.BB and Q RX.BB Satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB And satisfy

[0037] S RX.BB = ,

[0038] Among them, K R It represents the gain after filtering, gain adjustment and analog-to-digital conversion inside the receiving module. R Indicates the phase delay after filtering, gain adjustment, and analog-to-digital conversion within the receiving module.

[0039] Furthermore, in some embodiments, the above-mentioned modem mismatch detection method further includes:

[0040] The above adjustment determines the output signal I' transmitted by the digital baseband signal processing module of the modem. TX.BB and Q' TX.BB Satisfy the complex signal relationship

[0041] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB = ;

[0042] The above signal I' TX.BB and Q' TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal I' TX.FLT and Q' TX.FLT Satisfies the complex signal relationship S' TX.FLT =I' TX.FLT +jQ' TX.FLT = ;

[0043] The output signal I' from the output end of the transmitting module end is inputted by the receiving module end of the modem RX.FLT.in and Q' RX.FLT.in Satisfy the complex signal relationship

[0044] S' RX.FLT.in =I' RX.FLT.in +jQ' RX.FLT.in =jS'* TX.FLT =Q' TX.FLT +jI' TX.FLT And satisfy

[0045] S' RX.FLT.in =jS'* TX.FLT = ;

[0046] The above signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, the converted signal I' RX.BB and Q' RX.BB Satisfies the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB And satisfy

[0047] S' RX.BB = .

[0048] Furthermore, in some embodiments, the above-mentioned modem mismatch detection method further includes:

[0049] According to the signal I converted after filtering, gain adjustment and analog-to-digital conversion inside the receiving module, RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB , and satisfies the complex signal relation S RX.BB =I RX.BB +jQ RX.BB and S' RX.BB =I' RX.BB +jQ' RX.BB , and then get

[0050] and ;

[0051] Thus, the four mismatch parameters of baseband simulation mismatch are obtained, namely

[0052] .

[0053] In a fourth aspect of the present disclosure, a method for calibrating modem mismatch is provided, comprising:

[0054] Obtaining four mismatch parameters of the baseband analog mismatch of the modem according to the above detection method;

[0055] A corresponding one-stage or multi-stage equalizer is constructed in the modem digital domain to eliminate the above four mismatch parameters.

[0056] Compared with the prior art, the present disclosure has the following beneficial effects:

[0057] The present disclosure does not require the introduction of excessive additional external detection and calibration equipment, and makes full use of the basic circuit or module itself. By adjusting the transmission signal of the digital baseband signal processing module and correspondingly adjusting the operating state of the switching module, the received signal is processed and converted, thereby realizing the detection of phase and amplitude offsets caused by the mismatch between the transmitting module end and the receiving module end, and compensating the detected mismatch in the digital transmission section to eliminate the influence of these offsets, thereby increasing the data transmission rate of the modem, especially for large broadband modems, and even helping to reduce the interference signal strength of the modem and improve the image frequency suppression ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings, in which:

[0059] Figure 1 A schematic diagram of a basic architecture of a modem according to an embodiment of the present disclosure is shown;

[0060] Figure 2 A schematic diagram of a modem mismatch detection device according to an embodiment of the present disclosure is shown;

[0061] Figure 3 A schematic diagram showing a switching module of a modem mismatch detection apparatus in a first state according to some embodiments of the present disclosure is shown;

[0062] Figure 4 A schematic diagram showing a switching module of a modem mismatch detection apparatus in a second state according to some embodiments of the present disclosure is shown;

[0063] Figure 5 A flowchart illustrating a modem mismatch detection method according to an embodiment of the present disclosure is shown; and

[0064] Figure 6 A schematic diagram showing a modem mismatch detection device according to other embodiments of the present disclosure is shown;

[0065] In the various drawings, the same or corresponding reference numerals denote the same or corresponding parts. DETAILED DESCRIPTION

[0066] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0067] In the description of the embodiments of the present disclosure, the term "including" and similar terms should be understood as open inclusion, that is, "including but not limited to." The term "based on" should be understood as "based at least in part on." The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0068] It should be noted that in the embodiments of the present disclosure, the modem, and in particular the modem's receiver or transmitter, may be a circuit disposed on a chip, or may be a device or system composed of multiple corresponding modules. Furthermore, in some embodiments of the present disclosure, the modem's transmitter module includes a transmit digital baseband signal processing module, a digital-to-analog conversion module, a transmitter filtering module, and a transmit output terminal. The corresponding signal is emitted by the transmit digital baseband signal processing module and sequentially passes through the digital-to-analog conversion module, the transmitter filtering module, and the transmit output terminal. One or more gain adjustment units (e.g., multiple amplifier stages) may also be disposed between the transmit digital baseband signal processing module and the digital-to-analog conversion module, between the digital-to-analog conversion module and the transmitter filtering module, and between the transmitter filtering module and the transmit output terminal. Of course, each of the aforementioned modules may also have adjustable gain (e.g., the transmitter filtering module may also be a transmit analog variable gain and channel filtering module, wherein the filtering module itself has the function of adjusting the gain of the passing signal). Similarly, in some embodiments of the present disclosure, the receiving module end of the modem includes a receiving input end, a receiving end filtering module, an analog-to-digital conversion module, and a receiving digital baseband signal processing (Receive Digital Baseband Signal Processing) module, and the corresponding signal (for example, it can come from the switching module) is received by the receiving input end and passes through the receiving end filtering module, the analog-to-digital conversion module, and the receiving digital baseband signal processing module in sequence (that is, it is finally received by the receiving digital baseband signal processing module); one or more gain adjustment units (for example, several stages of amplifiers) can also be set between the receiving input end and the receiving end filtering module, between the receiving end filtering module and the analog-to-digital conversion module, and between the analog-to-digital conversion module and the receiving digital baseband signal processing module. Of course, each of the above modules itself can also be gain-adjustable (for example, the receiving end filtering module can also be a receiving end analog variable gain and channel filtering module, and its filtering module itself has the function of adjusting the gain of the passing signal; for another example, the analog-to-digital conversion module can also have a function of adjusting the signal gain in addition to the analog-to-digital conversion function). Furthermore, in the embodiments of the present disclosure, the transmit output and / or receive input defined in the above embodiments can be considered the baseband portion of the modem. Mismatches in these portions can be considered baseband mismatches. In the present disclosure, baseband mismatches are primarily caused by issues with the filter module (e.g., the filter or the aforementioned transmit filter module or receive filter module). Accordingly, modem mismatches also involve RF mismatches, which in the present disclosure are primarily caused by issues with the mixers on the transmit and receive sides.

[0069] Modem mismatch can generally be addressed through hardware-based solutions, employing high-performance analog components (filters, amplifiers, analog-to-digital converters, mixers, etc.). While these components can fundamentally mitigate the effects of I and Q mismatch, they are generally larger and more expensive, which in turn increases the power consumption and cost of mobile transceivers. Furthermore, even high-performance analog components cannot completely mitigate I and Q mismatch. This is because actual manufacturing processes can only approximate theoretical performance, not truly achieve it. Furthermore, the ability of actual components to mitigate I and Q mismatch varies under different environmental conditions (such as temperature and humidity). Therefore, mitigating I and Q mismatch in the analog domain is particularly practical. Alternatively, digital signal processing can be used to mitigate and compensate for these mismatches in the digital domain (i.e., the digital section of the modem). It should also be understood that solutions to address analog baseband mismatch include: 1) using external test equipment to detect the mismatch parameters of the chip's transmit signal and then writing them to the chip's internal non-volatile programmable devices (such as efuse, OTP, flash); 2) using an external RF signal source to transmit signals to the chip, detecting the mismatch parameters of the baseband receive signal internally, and then writing them to the chip's internal non-volatile programmable devices; 3) including an additional frequency-locked loop circuit internally for generating RF signals, which is used to detect mismatches in the receive chain after the chip is powered on. 4) including an additional detector internally for detecting mismatches in the transmit chain after the chip is powered on. 5) after the transmit chain is calibrated, it acts as a quasi-ideal signal source to perform loopback detection on the receive chain. 6) after the receive chain is calibrated, it acts as a quasi-ideal receiver to perform loopback detection on the transmit chain. 7) adding a phase shift operation to the RF local oscillator signal to decouple mismatches between the transmit and receive chains. The mismatch parameters detected above will be configured accordingly to the digital baseband transceiver mismatch compensation circuit, so that the compensated transceiver / receiver link achieves a mismatch-free effect. The various detection methods listed above either require the use of external instruments and internal non-volatile programmable devices, which have high implementation and testing costs and poor adaptability to changes in environmental factors such as temperature; or they require the addition of additional complex circuits, which have high implementation costs, poor detection accuracy, and low detection efficiency; or the phase shift operation has errors in implementation, thereby limiting detection accuracy; or the mismatch detection quantities of the RF and analog baseband are mixed, resulting in poor overall mismatch detection accuracy within the passband.

[0070] It should be noted that the transmitter or receiver of the modem needs to be recalibrated every time the gain is changed. The following embodiments are based on calibration after the gain is adjusted, and recalibration is required each time the gain and bandwidth are re-determined. It should also be understood that the parameters in some embodiments in the context of this disclosure are as follows: I: the abbreviation for in-phase; Q: the abbreviation for quadrature; S*: the conjugate of signal S; S': the signal form in another configuration, to distinguish it from the signal S in the original configuration; : angular frequency of baseband single tone signal; : Index is The angular frequency of the baseband tone signal; : angular frequency of the RF local oscillator signal; : natural constant; :index(=1,2,3....); : imaginary unit; : time; Re(): operation of taking the real part of a complex number; Im(): operation of taking the imaginary part of a complex number; | |: modulus operation; S TX.BB : digital baseband complex transmission signal; S RX.BB : digital baseband complex received signal; S TX.FLT : Transmit analog filter complex output signal; S RX.FLT.in : Receive analog filter complex input signal; K T : The gain of the signal after digital-to-analog conversion, filtering and gain adjustment in the transmission chain (or the gain of the entire transmission chain); φ T : Phase delay of the signal after digital-to-analog conversion, filtering and gain adjustment in the transmission chain; K R : The gain of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain (or the gain of the entire receiving chain); φ R : Phase delay of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain; K A : gain of RF attenuation; : The real part of the image component caused by the mismatch of the transmission link (or the amplitude mismatch of the transmitted RF local oscillator signal); : The imaginary part of the image component caused by the mismatch of the transmission link (or the angle mismatch of the transmitted RF local oscillator signal); : The real part of the image component caused by the mismatch of the receiving link (or refers to the amplitude mismatch of the received RF local oscillator signal); : The imaginary part of the image component caused by the mismatch of the receiving link (or refers to the angular mismatch of the received RF local oscillator signal); : Image components caused by mismatch in the entire transmit and receive link; : Index is , positive sideband image component caused by mismatch between transmit and receive links; : Index is , negative sideband image components caused by mismatch in the entire transmit and receive link; : amplitude of the complex signal; : Index is , the amplitude of the positive sideband complex tone signal; : Index is , the amplitude of the complex tone signal with negative sideband; : ideal complex transmitted local oscillator signal; : There is a mismatched complex transmission local oscillator signal; : Ideal complex received local oscillator signal; : There is a mismatched complex received local oscillator signal; : The phase of the complex transmitted local oscillator signal; : The phase of the complex received local oscillator signal; : actual transmitted radio frequency signal; S TX.RF.poly : The complex RF output signal of the real transmitted RF signal after passing through the polyphase filter; : Receives the complex output signal of the mixer.

[0071] Therefore, in order to detect the mismatch of the baseband part of the modem, the example embodiments of the present disclosure propose a modem mismatch detection device. The device includes an additional switching module and the original baseband part inside the modem. Then the device only needs to set up a switching module with different working states inside it to cooperate with the corresponding signal transmission mode of different states. It can borrow the original modem module to extract the key parameters of the mismatch and compensate for the mismatch, thereby improving the signal quality. Accordingly, the present disclosure also proposes a modem mismatch detection method, which can be based on the above-mentioned modem mismatch detection device. Accordingly, for the mismatch of the detected baseband part, especially the extraction of the key parameters of the mismatch, some embodiments of the present disclosure also specifically design a modem calibration method and provide some embodiments of the modem calibration device. The following is a detailed description of each in conjunction with the contents of the accompanying drawings.

[0072] Figure 1 The basic architecture diagram of the modem according to an embodiment of the present disclosure is shown. In this illustrated embodiment, the lower portion of the diagram is the transmitter portion, the upper portion of the diagram is the receiver portion, and the transmit and receive signals are marked. In the illustrated embodiment, two signals are sent by the transmit digital baseband signal processing module, wherein the transmit signal I TX.BB and Q TX.BB Satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BBObviously, after the transmit signal is sent out by the transmit digital baseband signal processing module, it passes through the digital-to-analog conversion module (for example, DAC), the transmit filter module (for example, the transmit analog variable gain and channel filter module), the transmit mixer (local oscillation signal LO), and the combiner (for example, the adder) in sequence, and then is amplified by the power amplifier (PA); at this time, the signal is transmitted to the antenna and propagates outward. Correspondingly, the signal from the antenna (in some embodiments, it can also come from the transmitter part) can be split to two receive mixers (local oscillation signal LO) through the low noise amplifier (LNA), and then passes through the receive filter module (for example, the receive analog variable gain and channel filter module), the analog-to-digital conversion module (for example, ADC), and the final signal I RX.BB and Q RX.BB The digital baseband signal processing module receives the two signals I RX.BB and Q RX.BB Satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB In this illustrated embodiment, the signal I TX.BB is the real part signal, signal Q TX.BB The two signals sent by the digital baseband signal processing module are actually two real signals. However, the complex signal relationship is used for the convenience of theoretical explanation. The following is used to illustrate the signal input and output of each module or device. In the embodiment shown in the figure, the input signal of the digital-to-analog conversion module (for example, DAC) is I TX.BB and Q TX.BB , the corresponding output signal is I TX.DAC and Q TX.DAC , and satisfy the complex relation S TX.DAC =I TX.DAC +jQ TX.DAC ; The input signal of the transmitter filter module is I TX.DAC and Q TX.DAC , the corresponding output signal is I TX.FLT and Q TX.FLT , and satisfy the complex relation S TX.FLT =I TX.FLT +jQ TX.FLT ; The input signal of the transmitter mixer (local oscillation signal LO) is I TX.FLT and Q TX.FLT , and after passing through the transmitter mixer shown in the figure, the two signals are combined by a combiner (adder) and output as V TX.RF.MIX ; The input signal of the power amplifier (for example, PA) is V TX.RF.MIX , the corresponding output signal is V TX.RF ; The input signal of the three-way switching module is V TX.RF , the output signal of the corresponding antenna is VTX.ANT ; while the signal V TX.ANT Correspondingly, in the illustrated embodiment, the antenna receives and sends a signal V to the inside of the transceiver. TX.ANT ; Signal V TX.ANT Through the three-way switching module to become the signal V RX.RF ; The input signal V of the low noise amplifier (LNA) at one end of the receiver RX.RF , the corresponding output signal is V RX.RF.LNA ; Signal V RX.RF.LNA The two signals are divided into upper and lower paths and output through the receiving mixer (local oscillation signal LO) as I RX.MIX and Q RX.MIX , in particular, the two signals satisfy the complex relationship S RX.MIX =I RX.MIX +jQ RX.MIX ; The input signal of the receiving end filter module is I RX.MIX and Q RX.MIX , the corresponding output signal is I RX.FLT and Q RX.FLT , and satisfy the complex relation S RX.FLT =I RX.FLT +jQ RX.FLT ; The input signal of the analog-to-digital conversion module (for example, ADC) is I RX.FLT and Q RX.FLT , the corresponding output signal is I RX.BB and Q RX.BB , and satisfy the complex relation S RX.BB =I RX.BB +jQ RX.BB ; Thus the two signals I RX.BB and Q RX.BB Finally, the signals are sent to the receiving digital baseband signal processing module. TX.BB and Q TX.BB Each of the two signals can still be further subdivided into two differential signals of the next level, that is, the transmission signal I is transmitted by two paired differential signals. TX.BB The transmission signal Q is transmitted by two pairs of differential signals at the next level. TX.BB ; For example, if you need to send a transmission signal -I TX.BB , then just send the original I TX.BB The differential signals sent by the two paths of the next level can be exchanged (I path differential reverse); for example, if you need to send a transmission signal -Q TX.BB , then just send the original Q TX.BB The differential signals sent by the two paths of the next level can be exchanged (Q path differential is reversed).

[0073] Then, the corresponding modem mismatch detection device will be explained below in conjunction with the accompanying drawings and embodiments.

[0074] Figure 2 FIG. 1 shows a schematic diagram of a modem mismatch detection device according to an embodiment of the present disclosure. Figure 1The difference between the embodiments is that a circuit breaker is provided between the transmitter filter and the transmitter mixer at the transmitter end, so as to disconnect the signal from continuing to be transmitted to the back end (disconnecting the transmitter baseband part and the radio frequency part); accordingly, a circuit breaker is also provided between the receiver filter and the receiver mixer at the receiver end, so as to disconnect the baseband part and the radio frequency part of the receiver; in addition, in the illustrated embodiment, the downlink transmitter baseband part can be set as a transmitting module end, which includes a transmitting digital baseband signal processing module, a digital-to-analog conversion module, and a transmitting filter module; and the uplink receiver baseband part can be set as a receiving module end, which includes a receiving filter module, an analog-to-digital conversion module, and a receiving digital baseband signal processing module. Furthermore, in the illustrated embodiment, the output end of the upper transmitting end filter module in the transmitting module end is set as the first transmitting end, and the output end of the lower transmitting end filter module in the transmitting module end is set as the second transmitting end; correspondingly, the input end of the upper receiving end filter module in the receiving module end is set as the first receiving end, and the input end of the lower receiving end filter module in the receiving module end is set as the second receiving end; then, in the above-mentioned detection device, a switching module is included which is arranged between the transmitting module end and the receiving module end of the above-mentioned modem; and the switching module includes a first state and a second state. When the switching module is set to the first state, the signal from the above-mentioned first transmitting end can be transmitted to the above-mentioned first receiving end, and the signal from the above-mentioned second transmitting end can be transmitted to the above-mentioned second receiving end; when the switching module is set to the second state, the signal from the above-mentioned first transmitting end can be transmitted to the above-mentioned second receiving end, and the signal from the above-mentioned second transmitting end can be transmitted to the above-mentioned first receiving end. Correspondingly, the detection mismatch function of the detection device for matching modem mismatch, the transmission digital baseband signal processing module on the transmission module side may include corresponding first and second states; when the transmission digital baseband signal processing module is in the first state, the first digital transmitting end of the transmission digital baseband signal processing module (for example, the upper path of the two paths shown in the figure) sends an I signal, and the second digital transmitting end of the transmission digital baseband signal processing module (for example, the lower path of the two paths shown in the figure) sends a Q signal, wherein the complex signal relationship S=I+jQ is satisfied; when the transmission digital baseband signal processing module is in the second state, the first digital transmitting end of the transmission digital baseband signal processing module (for example, the upper path of the two paths shown in the figure) sends a Q signal, and the second digital transmitting end of the transmission digital baseband signal processing module (for example, the lower path of the two paths shown in the figure) sends an I signal, wherein the complex signal relationship S'=Q+jI=jS* is satisfied; further, when the transmission digital baseband signal processing module is set to the first state, the switching module is also set to its first state; and when the transmission digital baseband signal processing module is set to the second state, the switching module is also set to its second state.In other words, when the transmitting digital baseband signal processing module is set to the first state, the above-mentioned first digital transmitting end sends out the first digital signal I and the above-mentioned second digital transmitting end sends out the second digital signal Q. The switching module is then set to the first state, and the two signals sent by the transmitting digital baseband signal processing module must satisfy the complex signal relationship, for example, S1=I+jQ, and it is also necessary to satisfy that the phase of the second digital signal Q is 90 degrees ahead of the phase of the first digital signal I; when the transmitting digital baseband signal processing module is set to the second state, the first digital transmitting end sends out the second digital signal Q and the second digital transmitting end sends out the first digital signal I, so that the first digital signal I and the second digital signal Q satisfy the complex signal relationship S2=Q+jI, and the switching module is set to the second state.

[0075] Furthermore, in some embodiments, the first digital transmitter further includes a first digital transmitter P terminal and a first digital transmitter N terminal, wherein the first digital transmitter P terminal and the first digital transmitter N terminal can be used to output a pair of differential signals. For example, when the first digital transmitter sends the first digital signal I, the first digital transmitter P terminal outputs one of the differential signals I. + , and the first digital transmitter N terminal can output the differential signal I of another path - , then signal I + With signal I - The corresponding paired differential signals are formed, and the first digital transmitting end sends the first digital signal I. Accordingly, in some embodiments, the second digital transmitting end further includes a second digital transmitting P end and a second digital transmitting N end, and the second digital transmitting P end and the second digital transmitting N end can also be used to output paired differential signals (for example, signal Q + With signal Q - ).

[0076] Furthermore, in some embodiments, the first transmitting end may also include a first transmitting P-end and a first transmitting N-end, and the first transmitting P-end and the first transmitting N-end may be used to output paired differential signals; and the second transmitting end may also include a second transmitting P-end and a second transmitting N-end, and the second transmitting P-end and the second transmitting N-end may be used to output paired differential signals. Correspondingly, in some embodiments, the first receiving end may also include a first receiving P-end and a first receiving N-end, and the first receiving P-end and the first receiving N-end may be used to receive paired differential signals; and the second receiving end may also include a second receiving P-end and a second receiving N-end, and the second receiving P-end and the second receiving N-end may be used to receive paired differential signals.

[0077] Therefore, further, in some detailed embodiments, the switching module in the first state is configured to connect the first transmitting P end with the first receiving P end, connect the first transmitting N end with the first receiving N end, connect the second transmitting P end with the second receiving P end, and connect the second transmitting N end with the second receiving N end; in this way, the switching module in the first state is configured to transmit the signal from the first transmitting end to the first receiving end (without changing the signal phase), and transmit the signal from the second transmitting end to the second receiving end (without changing the signal phase).

[0078] Accordingly, in some refined embodiments, the switching module in the second state is configured to connect the second transmitting P end with the first receiving P end, connect the second transmitting N end with the first receiving N end, connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end; in this way, the switching module in the second state is configured to transmit the signal from the first transmitting end to the second receiving end (without changing the signal phase), and transmit the signal from the second transmitting end to the first receiving end (without changing the signal phase).

[0079] Furthermore, in some embodiments, the switching module may further include a third state, and the third state may include a third A state and a third B state; the switching module in the third A state is configured to connect the second transmitting P end with the first receiving P end, and connect the second transmitting N end with the first receiving N end (i.e., only the signal of the second transmitting end is sent to the first receiving end, and the differential phase of the path is not changed); connect the first transmitting P end with the second receiving N end, and connect the first transmitting N end with the second receiving P end (i.e., not only the signal of the first transmitting end is sent to the second receiving end, but also the differential phase of the path is inverted); so that the switching module in the third B state is configured to connect the second transmitting P end with the first receiving N end, and connect the second transmitting N end with the first receiving P end (i.e., not only the signal of the second transmitting end is sent to the first receiving end, but also the differential phase of the path is inverted); connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end (i.e., only the signal of the first transmitting end is sent to the second receiving end, and the differential phase of the path is not changed).

[0080] Furthermore, in some embodiments, when the first digital transmitting end sends a second digital negative signal -Q (i.e., the differential of this path is inverted) and the second digital transmitting end sends a first digital signal I (i.e., the differential of this path is not inverted), so that the first digital signal I and the second digital negative signal -Q satisfy the complex signal relationship S3=-Q+jI, the switching module is set to the third state or the second state.

[0081] Furthermore, in some embodiments, when the first digital transmitting end sends the second digital signal Q (i.e., the differential of this path is not inverted) and the second digital transmitting end sends the first digital negative signal -I (i.e., the differential of this path is inverted), so that the first digital negative signal I and the second digital signal Q satisfy the complex signal relationship S4=Q-jI, the switching module is set to the third state or the second state.

[0082] Figure 3 A schematic diagram of a modem mismatch detection device according to some embodiments of the present disclosure shows a switching module in a first state. In this exemplary embodiment, the switching module is in the first state, and the transmit digital baseband signal processing module is also in its first state. At this time, the output signal I transmitted by the transmit digital baseband signal processing module of the modem is TX.BB and Q TX.BB Satisfies the complex signal relationship:

[0083] S TX.BB =I TX.BB +jQ TX.BB = .

[0084] Figure 4 A schematic diagram illustrating a modem mismatch detection device according to some embodiments of the present disclosure wherein the switching module is in a second state. In this exemplary embodiment, the switching module is in the second state, and the transmit digital baseband signal processing module is also in its second state. At this time, the output signal I' transmitted by the transmit digital baseband signal processing module of the modem is TX.BB and Q' TX.BB Satisfies the complex signal relationship:

[0085] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB = .

[0086] Then, with respect to the modem mismatch detection device of the above embodiment, some corresponding embodiments of a modem mismatch detection method are provided below.

[0087] Figure 5 A flow chart of a modem mismatch detection method according to an embodiment of the present disclosure is shown. In this exemplary embodiment, a modem mismatch detection method 500 is shown, which includes the following steps: Step 510, determining an output signal (e.g., a first signal) transmitted by a transmit digital baseband signal processing module of a modem. TX.BB and Q TX.BB, and satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ; Step 520, determine signal I TX.BB and Q TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal (for example, counted as the second signal) I TX.FLT and Q TX.FLT , signal I TX.FLT and Q TX.FLT Output from the output end of the transmitting module, and satisfy the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT Step 530, determine the modem receiving module input terminal from the output terminal of the transmitting module terminal signal (eg, counted as the third signal) I RX.FLT.in and Q RX.FLT.in , and satisfy the complex signal relationship S RX.FLT.in =I RX.FLT.in +jQ RX.FLT.in =S TX.FLT ; Step 540, determine signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, it is converted into a signal (for example, counted as the fourth signal) I RX.BB and Q RX.BB , and satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB , signal I RX.BB and Q RX.BB Finally transmitted to the receiving digital baseband signal processing module of the modem; Step 550, adjust and determine the output signal (eg, counted as the fifth signal) transmitted by the transmitting digital baseband signal processing module of the modem I' TX.BB and Q' TX.BB , and satisfy the complex signal relationship:

[0088] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB ;

[0089] Step 560, determine signal I' TX.BB and Q' TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal (for example, counted as the sixth signal) I' TX.FLT and Q'TX.FLT , and signal I' TX.FLT and Q' TX.FLT Output from the output end of the transmitting module, and satisfy the complex signal relationship S' TX.FLT =I' TX.FLT +jQ' TX.FLT Step 570, determine the modem receiving module input end of the output signal from the output end of the transmitting module end (eg, counted as the seventh signal) I ' RX.FLT.in and Q' RX.FLT.in , which satisfies the complex signal relation

[0090] S' RX.FLT.in =I' RX.FLT.in +jQ' RX.FLT.in =jS'* TX.FLT =Q' TX.FLT +jI' TX.FLT ;

[0091] Step 580, determine signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, it is converted into a signal (for example, counted as the eighth signal) I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , signal I' RX.BB and Q' RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the modem; Step 590, according to the signal I received by the receiving digital baseband signal processing module of the modem RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB To obtain the four mismatch parameters of baseband simulation mismatch.

[0092] In particular, for the above step 510, in some embodiments, the output signal I transmitted by the transmit digital baseband signal processing module of the above modem is TX.BB and Q TX.BB Satisfies the complex signal relationship:

[0093] S TX.BB =I TX.BB +jQ TX.BB = ;

[0094] In particular, for the above step 520, in some embodiments, the above signal I TX.BB and Q TX.BBThe output signal I is converted after digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the above-mentioned modem. TX.FLT and Q TX.FLT Satisfies the complex signal relationship:

[0095] S TX.FLT =I TX.FLT +jQ TX.FLT = ;

[0096] In particular, for the above step 530, in some embodiments, the signal I from the output end of the above transmitting module end is inputted by the receiving module end of the above modem. RX.FLT.in and Q RX.FLT.in Satisfies the complex signal relationship:

[0097] S TX.FLT.in =I TX.FLT.in +jQ TX.FLT.in =S TX.FLT ;

[0098] In particular, for the above step 540, in some embodiments, the above signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, the converted signal I RX.BB and Q RX.BB Satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB And satisfy the relationship:

[0099] S RX.BB = .

[0100] In particular, for the above step 550, in some embodiments, the above adjustment and determination of the output signal I' transmitted by the transmit digital baseband signal processing module of the above modem TX.BB and Q' TX.BB Satisfies the complex signal relationship:

[0101] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB = ;

[0102] In particular, for the above step 560, in some embodiments, the above signal I' TX.BB and Q' TX.BBAfter the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal I' TX.FLT and Q' TX.FLT Satisfies the complex signal relationship:

[0103] S' TX.FLT =I' TX.FLT +jQ' TX.FLT = ;

[0104] In particular, for the above step 570, in some embodiments, the output signal I′ from the output end of the above transmitting module end is inputted by the receiving module end of the above modem. RX.FLT.in and Q' RX.FLT.in Satisfies the complex signal relationship:

[0105] S' RX.FLT.in =I' RX.FLT.in +jQ' RX.FLT.in =jS'* TX.FLT =Q' TX.FLT +jI' TX.FLT

[0106] And meet the following requirements:

[0107] S' RX.FLT.in =jS'* TX.FLT = ;

[0108] In particular, for the above step 580, in some embodiments, the above signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, the converted signal I' RX.BB and Q' RX.BB Satisfies the complex signal relationship:

[0109] S' RX.BB =I' RX.BB +jQ' RX.BB

[0110] And meet:

[0111] S' RX.BB = .

[0112] In particular, for the above step 590, in some embodiments, the signal I converted after filtering and gain adjustment and analog-to-digital conversion in the receiving module is RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB , and satisfies the complex signal relation SRX.BB =I RX.BB +jQ RX.BB and S' RX.BB =I' RX.BB +jQ' RX.BB ; Then use the FFT method to extract the mismatch factor, for example, for S RX.BB Performing FFT yields:

[0113] ,

[0114] For negative sideband frequency components ( ) is normalized, and the amplitude is divided by the positive sideband ( ) and the phase at the corresponding frequency of the positive sideband, and we get a series of complex values:

[0115] ;

[0116] Similarly, the mismatch factor is extracted using the FFT method, for example, for S' RX.BB Perform similar operations and we get: ;

[0117] According to the above relationship between Di and D'-i, the four mismatch parameters of baseband simulation mismatch are obtained, namely

[0118] ;

[0119] The four mismatch parameters obtained for any single-tone transmission signal can be used to construct corresponding equalizers at the modem's digital end to eliminate these four mismatch parameters. Therefore, for the entire frequency band, multiple different single-tone signals are simultaneously transmitted for detection and calibration to cover the entire frequency band. It should also be noted that the subscript i represents an index within a series of BB tone combinations, meaning that the parameter with the subscript i represents the single-tone parameter at the i-th frequency point. Furthermore, each frequency point corresponds to four mismatch parameters, and for N frequency points, there are 4N mismatch parameters.

[0120] Furthermore, based on the above detection method, a modem mismatch calibration method is also provided. This method requires first obtaining four mismatch parameters of the baseband analog mismatch of the above modem according to the above detection method; then corresponding equalizers can be constructed at the digital end of the modem to eliminate the four mismatch parameters.

[0121] It should be understood that the mismatch of the modem may include the mismatch of the baseband part and the mismatch of the RF part. In the above embodiments, the detection and calibration of the mismatch of the baseband part (for example, caused by the filter) have been included. However, the modem may also have a mismatch of the RF segment (for example, caused by the mixer).

[0122] Figure 6 A schematic diagram of a modem mismatch detection device according to another embodiment of the present disclosure is shown. In this exemplary embodiment, at the output end of a power amplifier (PA) on the transmitter side, the PA's transmitter output can be directed through a positive sideband polyphase filter (PSPF) to direct two signals (with a phase offset of π / 2 and a phase offset of 0) to two mixer groups (an upper group of two mixers and a lower group of two mixers on the receiver side). The combined signal is then transmitted to the baseband portion of the receiver (the receiving module described above).

[0123] It should be understood that the ideal up-converter (transmitter link mixer) local oscillator signal is: , is the phase of the local oscillator signal. After considering the mismatch, the form is:

[0124] ,

[0125] in is the amplitude mismatch, is the angle mismatch. Then the digital baseband signal , after passing through an ideal analog transmit filter with delay (the filter of the transmitter chain): ;

[0126] After passing through the non-ideal up-conversion mixer (the mixer of the transmitter chain) and the power amplifier, the RF transmit signal is generated:

[0127]

[0128] Similarly, the ideal down-conversion (mixer in the receiver chain) local oscillator signal is: , after considering the mismatch, the form is:

[0129]

[0130] The result of a non-ideal transmit tone signal passing through a non-ideal receive down-conversion mixer (the mixer in the receiver chain) is:

[0131]

[0132]

[0133]

[0134]

[0135]

[0136] After passing through an ideal analog receive filter with delay (the filter of the receiver chain):

[0137]

[0138]

[0139] Obviously, the mismatch between the transmitter link and the receiver link is mixed together and cannot be separated.

[0140] In order to solve the problem that the mismatch amount cannot be separated, the following will explain the corresponding modem mismatch calibration device in conjunction with the accompanying drawings and embodiments. Figure 6 In the illustrated embodiment, Figure 2The difference between the embodiments is that an adjustment module is provided between the output end of the power amplifier of the transmitter link and the input end of the receiver baseband link (it should be understood that the switch between the baseband link and the RF link of the modem's transmitter or receiver is closed for the purpose of explaining the adjustment module below). The adjustment module is used to perform RF attenuation, positive sideband multi-phase filtering, and mixing on the signal from the power amplifier in sequence for input into the receiver baseband link. It should be noted that the positive sideband multi-phase filter immediately following the RF attenuator is divided into two paths. When both paths are closed, it is the first state of the adjustment module. When the upper path of the positive sideband multi-phase filter shown in the figure is disconnected and the lower path is closed, it is the second state of the adjustment module. In addition, in the illustrated embodiment, the drop transmitter baseband part can be set as a transmitting module end, which includes a transmitting digital baseband signal processing module, a digital-to-analog conversion module, and a transmitting-end filtering module. Accordingly, the drop transmitter link can also be set to transmit the signal from the transmitting digital baseband signal processing module and sequentially pass through the digital-to-analog conversion module, the transmitting-end filtering module, the transmitting mixing module, the combiner, the power amplifier, and the output end of the transmitter link; and the add receiver baseband part can be set as a receiving module end (it can also be set as a receiver baseband link), and the receiver baseband link (receiving module end) includes a receiving-end filtering module, an analog-to-digital conversion module, and a receiving digital baseband signal processing module. Regarding the adjustment module, as shown in the illustrated embodiment, the input end of the adjustment module is connected to the output end of the power amplifier of the transmitter link, and the output end of the adjustment module is connected to the input end of the receiver baseband link after mixing and combining. Obviously, the input end of the receiver baseband link includes the illustrated uplink input end (which can also be identified as the input end of the uplink receiving end filtering module of the receiver baseband link as the first receiving end) and the downlink input end (which can also be identified as the input end of the downlink receiving end filtering module of the receiver baseband link as the second receiving end). In the embodiment shown in the figure, the RF attenuation of the adjustment module is achieved by an RF attenuator; the positive sideband multi-phase filtering of the adjustment module is achieved by a positive sideband multi-phase filter, wherein the positive sideband multi-phase filter has two outputs. If the upper output of the positive sideband multi-phase filter is turned on, it is branched into a first mixer (local oscillation signal LO, the first mixer from the top to the bottom of the receiver chain in the figure) and a second mixer (local oscillation signal LO, the second mixer from the top to the bottom of the receiver chain in the figure); if the lower output of the positive sideband multi-phase filter is turned on, it is branched into a third mixer (local oscillation signal LO, the third mixer from the top to the bottom of the receiver chain in the figure) and a fourth mixer (local oscillation signal LO, the fourth mixer from the top to the bottom of the receiver chain in the figure), and the outputs of the first mixer and the third mixer are combined, and the outputs of the second mixer and the fourth mixer are combined.

[0141] Furthermore, in the illustrated embodiment, the output end of the upper transmitting-end filter module in the transmitting module end (transmitter baseband link) is set as the first transmitting end, and the output end of the lower transmitting-end filter module in the transmitting module end (transmitter baseband link) is set as the second transmitting end; correspondingly, the input end of the upper receiving-end filter module in the receiving module end (receiver baseband link) is set as the first receiving end, and the input end of the lower receiving-end filter module in the receiving module end (receiver baseband link) is set as the second receiving end.

[0142] Then, in the above calibration device, it includes a transmitter chain and a receiver chain, the transmitter chain includes a transmitter baseband chain, and the receiver chain includes a receiver baseband chain; an adjustment module is arranged between the output end of the power amplifier of the transmitter chain and the input end of the receiver baseband chain. The adjustment module includes a first state and a second state. The adjustment module in the first state is arranged to adjust the signal V from the power amplifier to TX.RF After RF attenuation and positive sideband multiphase filtering, the signal V TX.RF is decomposed into signal I TX.RF.poly and signal Q TX.RF.poly , and satisfies the complex signal relation S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly , so that the signal I TX.RF.poly and signal Q TX.RF.poly After being split and mixed, they are output as signals I RX.MIX and signal Q RX.MIX , so that the complex signal relationship S is satisfied RX.MIX =I RX.MIX +jQ RX.MIX , signal I RX.MIX and signal Q RX.MIX The adjustment module in the second state is configured to transmit the signal V' from the power amplifier after the transmitter calibration is completed. TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , signal I' RX.MIX and signal Q' RX.MIX is transmitted to the receiver baseband link.

[0143] In some embodiments, the adjustment module is in a first state, that is, in order to first perform transmitter link calibration, the positive sideband polyphase filter immediately following the RF attenuator is divided into two paths. When both paths are closed, the adjustment module is in the first state. At this time, the output signal I transmitted by the transmit digital baseband signal processing module of the modem is TX.BB and Q TX.BB Satisfies the complex signal relationship:

[0144] S TX.BB =I TX.BB +jQ TX.BB = ;

[0145] Signal I TX.BB and Q TX.BB After the digital-to-analog converter and the transmitter filter, the signal I is obtained. TX.FLT and Q TX.FLT , satisfying the complex signal relationship: S TX.FLT =I TX.FLT +jQ TX.FLT = ;Signal I TX.FLT and Q TX.FLT After passing through the mixer, combiner, and power amplifier, the output is signal V TX.RF Then, the adjustment module for the first state is configured to receive a signal V from the power amplifier. TX.RF ,

[0146] Among them, V TX.RF =

[0147] = ,

[0148] Signal V TX.RF After RF attenuation (via RF attenuator) and positive sideband polyphase filtering (via positive sideband polyphase filter), the signal V TX.RF is decomposed into signal I TX.RF.poly and signal Q TX.RF.poly , and satisfies the complex signal relationship:

[0149] S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly ,in

[0150] I TX.RF.poly +jQ TX.RF.poly = ;

[0151] Signal I TX.RF.poly and signal Q TX.RF.poly After being divided and mixed (via a mixer), they are output as signal IRX.MIX and signal Q RX.MIX , so that the complex signal relationship is satisfied:

[0152] S RX.MIX =I RX.MIX +jQ RX.MIX = ;

[0153] Furthermore, the signal I RX.MIX and signal Q RX.MIX After filtering (via the receiving end filter) and analog-to-digital conversion (via the analog-to-digital converter), it is converted into a signal I RX.BB and Q RX.BB , and finally transmitted to the receiving digital baseband signal processing module, where the signal I RX.BB and Q RX.BB Satisfies the complex signal relationship:

[0154] S RX.BB =I RX.BB +jQ RX.BB = ;

[0155] Obviously, the above formula only contains the mismatch of the transmitter link.

[0156] Furthermore, in the previous embodiment, at the digital receiving end, the mismatch amount is detected by integration:

[0157] ;

[0158] ;

[0159] Dividing the two equations yields the test quantity: ,in The phase shift of the transmit / receive analog filter is a fixed value (does not change with time). Calibration in the digital domain at the transmitter can make the detection amount When the value is 0, the transmit image calibration is completed and the transmitted signal will be an ideal single-tone signal without an image. It seems to contain two variables and , in fact It can be calculated, and then in the transmission calibration circuit, just scan (iterate) the single-dimensional variable , then The real and imaginary parts of are respectively assigned to the corresponding parameters in the transmit calibration circuit, so that If the value is 0, the transmitter calibration is completed. Therefore, the transmitter chain of the modem is calibrated, and the receiver chain of the modem needs to be calibrated next.

[0160] In some embodiments, the adjustment module is in the second state, that is, in order to calibrate the receiver link after the transmitter link is calibrated, the positive sideband polyphase filter is disconnected and closed immediately after the RF attenuator. At this time, the output signal transmitted by the transmit digital baseband signal processing module of the modem passes through the digital-to-analog converter, the transmitter filter, and then passes through the mixer, combiner, and power amplifier before being output as signal V' TX.RF , and then the signal V' TX.RF After performing RF attenuation (via RF attenuator), positive sideband polyphase filtering (via positive sideband polyphase filter), the signal is divided into two paths and mixed (via mixer) to obtain signal I' RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , signal I' RX.MIX and Q' RX.MIX In some embodiments, the adjustment module in the second state is configured to receive a signal V' from the power amplifier after the transmitter calibration is completed. TX.RF , which satisfies the relationship:

[0161] V' TX.RF = ,

[0162] Signal V' TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , where I' RX.MIX +jQ' RX.MIX ;

[0163] Furthermore, signal I' RX.MIX and Q' RX.MIX After filtering (via the receiving end filter) and analog-to-digital conversion (via the analog-to-digital converter), it is converted into a signal I' RX.BB and Q' RX.BB , and finally transmitted to the receiving digital baseband signal processing module, where the signal I' RX.BB and Q' RX.BB Satisfies the complex signal relationship:

[0164] I' RX.BB +jQ' RX.BB = ;

[0165] Obviously, the above formula only contains the mismatch of the receiver link.

[0166] Furthermore, with respect to the previous embodiment, at the digital receiving end, the mismatch amount is detected by integration:

[0167] ;

[0168] ;

[0169] Dividing the two equations yields the test quantity: , performing calibration in the digital domain at the receiving end can eliminate these two mismatches.,Thus, the modem's receiver chain is calibrated, and then the entire modem's transmitter chain and receiver chain are calibrated.

[0170] In some embodiments, a modem mismatch calibration method 600 is further provided, which includes: step 610, determining the output signal I transmitted by the transmit digital baseband signal processing module of the modem; TX.BB and Q TX.BB (first signal), and satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ; Step 620, determine the above signal I TX.BB and Q TX.BB After the digital-to-analog conversion and filtering of the transmitter link of the above-mentioned modem, it is converted into a signal I TX.FLT and Q TX.FLT (second signal), and satisfies the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT ; Step 630, determine the above signal I TX.FLT and Q TX.FLT After the mixing, combining, and power amplification of the transmitter chain of the above-mentioned modem, it is converted into a signal V TX.RF (third signal); Step 640, determine the above signal V TX.RF After RF attenuation and positive sideband polyphase filtering, it is decomposed and converted into signal I TX.RF.poly and Q TX.RF.poly (the fourth signal), and satisfies the complex signal relationship: S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly ; Step 650, determine the above signal I TX.RF.poly and Q TX.RF.poly After being divided, mixed and combined, they are converted into signal I RX.MIX and Q RX.MIX (fifth signal), and satisfies the complex signal relationship S RX.MIX =IRX.MIX +jQ RX.MIX ; Step 660, determine the above signal I RX.MIX and Q RX.MIX After filtering and analog-to-digital conversion, it is converted into signal I RX.BB and Q RX.BB (sixth signal), and satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB ; The above signal I RX.BB and Q RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the above-mentioned modem; Step 670, according to the signal I received by the receiving digital baseband signal processing module of the above-mentioned modem RX.BB and Q RX.BB To obtain the transmitter link mismatch parameter, so as to eliminate the transmitter link mismatch parameter through digital domain adjustment of the transmitter link of the modem.

[0171] Further, for step 610, in some embodiments, the output signal I transmitted by the transmit digital baseband signal processing module of the modem is TX.BB and Q TX.BB Satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB = ;

[0172] Furthermore, for step 620, in some embodiments, the signal I TX.BB and Q TX.BB The converted signal I after digital-to-analog conversion and filtering inside the transmitter module of the above-mentioned modem TX.FLT and Q TX.FLT Satisfies the complex signal relationship:

[0173] S TX.FLT =I TX.FLT +jQ TX.FLT = ,

[0174] where φ T Represents the phase shift after filtering;

[0175] Further, for step 630, in some embodiments, the converted signal V after mixing, combining, and power amplification of the transmitter link of the modem is TX.RF Satisfaction relationship:

[0176] V TX.RF =

[0177] = ,

[0178] Among them, K T is the gain after mixing, combining, and power amplification of the transmitter link through the above-mentioned modem;

[0179] Further, for step 640, in some embodiments, the signal I is decomposed and converted after RF attenuation and positive sideband polyphase filtering. TX.RF.poly and Q TX.RF.poly Satisfies the complex signal relationship:

[0180] I TX.RF.poly +jQ TX.RF.poly = ,

[0181] Among them, K A is the gain of RF attenuation;

[0182] Furthermore, for step 650, in some embodiments, the converted signal I after branching, mixing, and combining is RX.MIX and Q RX.MIX Satisfies the complex signal relationship:

[0183] S RX.MIX =I RX.MIX +jQ RX.MIX = ;

[0184] Further, for step 660, in some embodiments, the signal I converted after filtering and analog-to-digital conversion is RX.BB and Q RX.BB Satisfies the complex signal relationship:

[0185] S RX.BB =I RX.BB +jQ RX.BB = .

[0186] Furthermore, in some embodiments, after eliminating the transmitter link mismatch parameter by digital domain adjustment of the transmitter link of the modem, that is, after completing step 670, the calibration method further includes: step 680, determining that the output signal transmitted by the transmit digital baseband signal processing module of the modem is converted into a signal V' after undergoing digital-to-analog conversion and filtering in the transmitter link of the modem, and then undergoing mixing, combining, and power amplification in the transmitter link of the modem. TX.RF Step 690, determine the signal V ' TX.RF After RF attenuation, positive sideband polyphase filtering, and then branching and mixing, it is converted into signal I' RX.MIX and Q' RX.MIX , and satisfy the complex signal relationship: S'RX.MIX =I' RX.MIX +jQ' RX.MIX Step 692, determine the above signal I ' RX.MIX and Q' RX.MIX After filtering and analog-to-digital conversion, it is converted into signal I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , the above signal I' RX.BB and Q' RX.BB Finally transmitted to the receiving digital baseband signal processing module of the above-mentioned modem; Step 694, according to the signal I' received by the receiving digital baseband signal processing module of the above-mentioned modem RX.BB and Q' RX.BB The receiver link mismatch parameter is obtained, and the receiver link mismatch parameter is eliminated by adjusting the digital domain of the receiver link of the modem.

[0187] Furthermore, regarding step 680, in some embodiments, the output signal transmitted by the transmit digital baseband signal processing module of the modem undergoes digital-to-analog conversion and filtering in the transmitter link of the modem, and then undergoes mixing, combining, and power amplification in the transmitter link of the modem to obtain the converted signal V'. TX.RF Satisfaction relationship:

[0188] V' TX.RF = ;

[0189] Further, for step 690, in some embodiments, the signal I′ is converted after RF attenuation, positive sideband polyphase filtering, and then branching and mixing. RX.MIX and Q' RX.MIX Satisfies the complex signal relationship:

[0190] I' RX.MIX +jQ' RX.MIX ;

[0191] Further, for step 692, in some embodiments, the signal I′ is converted after filtering and analog-to-digital conversion. RX.BB and Q' RX.BB Satisfies the complex signal relationship:

[0192] I' RX.BB +jQ' RX.BB .

[0193] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0194] The foregoing description is merely an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that the present disclosure is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A modem mismatch detection device, characterized in that: The detection device includes a switching module arranged between the transmitting module end and the receiving module end of the modem; The transmitting module end includes a transmitting output end, and the transmitting output end includes a first transmitting end and a second transmitting end; The receiving module end includes a receiving input end, and the receiving input end includes a first receiving end and a second receiving end; The switching module includes a first state and a second state. The switching module in the first state is configured to transmit the signal from the first transmitting end to the first receiving end, and transmit the signal from the second transmitting end to the second receiving end; the switching module in the second state is configured to transmit the signal from the first transmitting end to the second receiving end, and transmit the signal from the second transmitting end to the first receiving end, wherein the detection device is configured to adjust the transmission signal of the transmitting digital baseband signal processing module and adjust the operating state of the switching module, so that the phase and amplitude offsets caused by the respective mismatches of the transmitting module end and the receiving module end can be detected simultaneously and separately, and the detected mismatch amounts can be compensated respectively in the transmitting digital baseband signal processing module and the receiving digital baseband signal processing module.

2. The detection device according to claim 1, characterized in that: The transmitting module end is configured to transmit the signal from the transmitting digital baseband signal processing module, and sequentially pass through the digital-to-analog conversion module, the transmitting end filtering module, and the transmitting output end; The transmitting digital baseband signal processing module includes a first digital transmitting end and a second digital transmitting end; The receiving module end is configured to receive the signal from the switching module through the receiving input end, and sequentially pass the signal through the receiving end filtering module, the analog-to-digital conversion module, and the receiving digital baseband signal processing module; The receiving digital baseband signal processing module includes a first digital receiving end and a second digital receiving end.

3. The detection device according to claim 2, characterized in that: When the first digital transmitting end sends a first digital signal I and the second digital transmitting end sends a second digital signal Q, so that the first digital signal I and the second digital signal Q satisfy a complex signal relationship S1=I+jQ, the switching module is set to the first state; When the first digital transmitting end sends the second digital signal Q and the second digital transmitting end sends the first digital signal I, so that the first digital signal I and the second digital signal Q satisfy the complex signal relationship S2=Q+jI, the switching module is set to the second state.

4. The detection device according to claim 3, characterized in that: The first digital transmitting end further includes a first digital transmitting P end and a first digital transmitting N end, wherein the first digital transmitting P end and the first digital transmitting N end are used to output paired differential signals; The second digital transmitting end further includes a second digital transmitting P end and a second digital transmitting N end, and the second digital transmitting P end and the second digital transmitting N end are used to output paired differential signals; The first transmitting end further includes a first transmitting P end and a first transmitting N end, and the first transmitting P end and the first transmitting N end are used to output paired differential signals; The second transmitting end further includes a second transmitting P end and a second transmitting N end, and the second transmitting P end and the second transmitting N end are used to output paired differential signals; The first receiving end further includes a first receiving P end and a first receiving N end, wherein the first receiving P end and the first receiving N end are used to receive paired differential signals; The second receiving end further includes a second receiving P end and a second receiving N end, and the second receiving P end and the second receiving N end are used to receive paired differential signals.

5. The detection device according to claim 4, characterized in that: The switching module in the first state is configured to connect the first transmitting P-end with the first receiving P-end, connect the first transmitting N-end with the first receiving N-end, connect the second transmitting P-end with the second receiving P-end, and connect the second transmitting N-end with the second receiving N-end; The switching module of the second state is configured to connect the second transmitting P end with the first receiving P end, connect the second transmitting N end with the first receiving N end, connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end.

6. The detection device according to claim 5, characterized in that: The switching module further includes a third state, and the third state includes a third A state and a third B state; The switching module in the third A state is configured to connect the second transmitting P end to the first receiving P end, connect the second transmitting N end to the first receiving N end, connect the first transmitting P end to the second receiving N end, and connect the first transmitting N end to the second receiving P end; The switching module in the third B state is configured to connect the second transmitting P end with the first receiving N end, connect the second transmitting N end with the first receiving P end, connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end.

7. The detection device according to claim 6, characterized in that: When the first digital transmitting end transmits a second digital negative signal -Q and the second digital transmitting end transmits a first digital signal I, so that the first digital signal I and the second digital negative signal -Q satisfy a complex signal relationship S3=-Q+jI, the switching module is set to the third state or the second state; When the first digital transmitting end sends a second digital signal Q and the second digital transmitting end sends a first digital negative signal -I, so that the first digital negative signal I and the second digital signal Q satisfy the complex signal relationship S4=Q-jI, the switching module is set to the third state or the second state.

8. A modem mismatch optimization device, characterized in that: include: The modem mismatch detection device according to any one of claims 1 to 7; One or more equalizers are provided between the transmitting digital baseband signal processing module and the digital-to-analog conversion module of the modem, and between the receiving digital baseband signal processing module and the analog-to-digital conversion module of the modem.

9. A method for detecting modem mismatch using the detection device according to any one of claims 1 to 7, characterized in that: include: Determine the output signal I transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q TX.BB , and satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ; Determine the signal I TX.BB and Q TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into a signal I TX.FLT and Q TX.FLT , the signal I TX.FLT and Q TX.FLT Output from the output end of the transmitter module, and satisfy the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT ; Determine that the receiving module end of the modem inputs the signal I from the output end of the transmitting module end RX.FLT.in and Q RX.FLT.in , and satisfy the complex signal relationship S RX.FLT.in =I RX.FLT.in +jQ RX.FLT.in =S TX.FLT ; Determine the signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion inside the receiving module of the modem, it is converted into a signal I RX.BB and Q RX.BB , and satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB , the signal I RX.BB and Q RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the modem; Adjust and determine the output signal I' transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q' TX.BB , and satisfy the complex signal relationship S’ TX.BB =I’ TX.BB +jQ’ TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB ; Determine the signal I' TX.BB and Q' TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal I' TX.FLT and Q' TX.FLT , and the signal I' TX.FLT and Q' TX.FLT Output from the output end of the transmitter module, and satisfy the complex signal relationship S' TX.FLT =I' TX.FLT +jQ' TX.FLT ; Determine that the receiving module end of the modem inputs the output signal I' from the output end of the transmitting module end RX.FLT.in and Q' RX.FLT.in , which satisfies the complex signal relation S’ RX.FLT.in =I’ RX.FLT.in +jQ’ RX.FLT.in =jS’* TX.FLT =Q’ TX.FLT +jI’ TX.FLT ; Determine the signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion inside the receiving module of the modem, it is converted into a signal I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , the signal I' RX.BB and Q' RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the modem; According to the signal I received by the receiving digital baseband signal processing module of the modem RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB To obtain the four mismatch parameters of baseband simulation mismatch.

10. The detection method according to claim 9, characterized in that: The output signal I transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q TX.BB Satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB = , in, represents the complex single-tone signal with index i, whose angular frequency is , and 1 ≤ i ≤ N, where i and N are natural numbers, and N represents the number of complex tones with different angular frequencies; The signal I TX.BB and Q TX.BB The output signal I is converted after digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem. TX.FLT and Q TX.FLT Satisfy the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT = , Among them, K T represents the gain after digital-to-analog conversion, filtering and gain adjustment sent by the transmitting digital baseband signal processing module, φ T represents the phase delay after digital-to-analog conversion, filtering and gain adjustment sent by the transmitting digital baseband signal processing module, represents the amplitude mismatch introduced by the transmitting digital baseband signal processing module after digital-to-analog conversion, filtering and gain adjustment, Indicates the phase mismatch introduced by the transmitting digital baseband signal processing module after digital-to-analog conversion, filtering and gain adjustment; The receiving module of the modem inputs the signal I from the output end of the transmitting module. RX.FLT.in and Q RX.FLT.in Satisfies the complex signal relationship S RX.FLT.in =I RX.FLT.in +jQ RX.FLT.in =S TX.FLT ; The signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion inside the receiving module of the modem, the converted signal I RX.BB and Q RX.BB Satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB And satisfy S RX.BB = ， Among them, K R Indicates the gain after filtering, gain adjustment, and analog-to-digital conversion within the receiving module, φ R Indicates the phase delay after filtering, gain adjustment, and analog-to-digital conversion within the receiving module. It is represented by the amplitude mismatch introduced by the filtering and gain adjustment inside the receiving module and the analog-to-digital conversion. It represents the phase mismatch introduced by filtering, gain adjustment, and analog-to-digital conversion inside the receiving module.

11. The detection method according to claim 10, characterized in that: The adjustment and determination of the output signal I' transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q' TX.BB Satisfy the complex signal relationship S’ TX.BB =I’ TX.BB +jQ’ TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB = ; The signal I' TX.BB and Q' TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal I' TX.FLT and Q' TX.FLT Satisfy the complex signal relationship S' TX.FLT =I' TX.FLT +jQ' TX.FLT = ; The output signal I' from the output end of the transmitting module end is input by the receiving module end of the modem RX.FLT.in and Q' RX.FLT.in Satisfy the complex signal relationship S' RX.FLT.in =I' RX.FLT.in +jQ' RX.FLT.in =jS'* TX.FLT =Q' TX.FLT +jI' TX.FLT And satisfy S’ RX.FLT.in =jS’* TX.FLT = ; The signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion inside the receiving module of the modem, the converted signal I' RX.BB and Q' RX.BB Satisfies the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB And satisfy S’ RX.BB = 。 12. The detection method according to claim 11, characterized in that According to the signal I converted after filtering, gain adjustment and analog-to-digital conversion inside the receiving module end RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB , and satisfies the complex signal relation S RX.BB =I RX.BB +jQ RX.BB and S' RX.BB =I' RX.BB +jQ' RX.BB , and then get and ; Thus, four mismatch parameters of baseband simulation mismatch are obtained, among which, It is represented by the negative sideband image component caused by the mismatch between the transmit and receive links indexed as i in the first state, It is represented by the negative sideband image component caused by the mismatch between the transmit and receive links after the switching state, Expressed as The component with index i in Expressed as The component with index i in Expressed as The component with index i in Expressed as The component with index i in 。 13. A method for calibrating modem mismatch, characterized in that: include: Obtaining four mismatch parameters of the baseband analog mismatch of the modem according to the detection method according to any one of claims 9 to 12; A corresponding one-stage or multi-stage equalizer is constructed in the modem digital domain to eliminate the four mismatch parameters.

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