Modem mismatch detection and optimization device and detection and calibration method

Abstract

The invention provides a modem mismatch detection and optimization device and a modem mismatch detection and calibration method. The modem mismatch detection device comprises a switching module arranged between a transmitting module end and a receiving module end of a modem; the system also comprises a first transmitting terminal and a second transmitting terminal. A first receiving end and a second receiving end; the switching module in the first state is set to transmit a signal of the first transmitting end to the first receiving end and transmit a signal of the second transmitting end to the second receiving end; and the switching module in the second state is set 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, the invention also discloses a modem mismatch optimization device, a modem mismatch detection method and a modem mismatch calibration method. According to the invention, the key parameters of the mismatch can be extracted by using the module of the original modem, and the mismatch is compensated, so that the signal quality is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of radio frequency transceiver mismatch calibration, and particularly to a device and method for detecting and optimizing modem mismatch and for detection and calibration. Background Art

[0002] Currently, during the production process of integrated devices, there are process deviation fluctuations, and there are mismatch situations in the modems used on the signal path, which can, for example, lead to a deterioration in the signal-to-noise ratio of transmission and reception, affecting the performance of modulation and demodulation.

[0003] For example, when such a mismatch caused by process deterioration occurs in the signal path of the analog baseband part of the modem, such as in the receive / transmit filters, receive / transmit A / D and D / A converters, the impact on high-speed, high-precision broadband systems is particularly significant. On the one hand, it is manifested as the amplitude mismatch of the quadrature signals, and on the other hand, it is manifested as the phase mismatch of the quadrature signals. These two aspects of mismatch usually have both static components and components that change with frequency.

[0004] Of course, since the actual parameters and characteristics change with factors such as temperature, aging, impedance, and power supply, many times when these parameters have changed, if the calibration parameters do not change accordingly, the quality of the transmitted signal will deteriorate, making it difficult for the receiving end at the air interface to demodulate, thus reducing the system throughput. The same is true for parameter mismatch at the receiving end. Therefore, it is necessary to detect and calibrate the amplitude and phase mismatch of the transmitted and received signals.

[0005] Solutions to solve the mismatch in the analog baseband part either need to rely on external instruments plus internal non-volatile programmable devices, resulting in high implementation costs and test costs and poor adaptability to environmental factors such as temperature; or need to add additional complex circuits, with high implementation costs, poor detection accuracy, and low detection efficiency; or there are errors in the implementation of the phase shift operation, thus limiting the detection accuracy; or the mismatch detection amounts of the radio frequency and the analog baseband are mixed together, resulting in poor overall mismatch detection accuracy within the passband.

[0006] Therefore, the existing technologies still need to be improved. In addition, it should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be simply considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of the present application. Summary of the Invention

[0007] To solve at least one of the above problems and one or more of other potential problems, the present disclosure provides a detection device for modem mismatch, and its detection and calibration methods. It only needs to set a switching module with different working states inside, cooperate with signal transmission modes in different states, and 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 detection device for modem mismatch is provided. The detection device includes a switching module disposed 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.

[0009] Further, in some embodiments, the transmitting module end is configured to issue a signal from a transmitting digital baseband signal processing module and sequentially pass through a digital-to-analog conversion module, a 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 through a receiving end filtering module, an analog-to-digital conversion module, and a 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.

[0010] Further, in some embodiments, when the first digital transmitting end issues a first digital signal I and the second digital transmitting end issues a second digital signal Q, such 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 issues the second digital signal Q and the second digital transmitting end issues the first digital signal I, such 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] Further, 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 in the first state is configured to connect the first transmitting P end to the first receiving P end, connect the first transmitting N end to the first receiving N end, connect the second transmitting P end to the second receiving P end, and connect the second transmitting N end to the second receiving N end; the switching module in the second 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 P end, and connect the first transmitting N end to 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 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 to the first receiving N end, connect the second transmitting N end to the first receiving P end, connect the first transmitting P end to the second receiving P end, and connect the first transmitting N end to the second receiving N end.

[0014] Further, in some embodiments, when the first digital transmitter sends a second digital negative signal -Q and the second digital transmitter sends a first digital signal I, such 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] Further, in some embodiments, when the first digital transmitter sends a second digital signal Q and the second digital transmitter sends a first digital negative signal -I, such 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, an optimization device for modem mismatch is provided, which includes the above-described detection device for modem mismatch; between the transmit digital baseband signal processing module and the digital-to-analog conversion module of the modem, and between the receive digital baseband signal processing module and the analog-to-digital conversion module of the modem, one or more levels of equalizers are provided.

[0017] In a third aspect of the present disclosure, a method for detecting modem mismatch is provided, which includes: Determining the output signals I TX.BB and Q TX.BB transmitted by the transmit digital baseband signal processing module of the modem, and such that the complex signal relationship S TX.BB = I TX.BB + jQ TX.BB is satisfied; Determining that the signals I TX.BB and Q TX.BB are converted into output signals I TX.FLT and Q TX.FLT after digital-to-analog conversion, filtering, and gain adjustment inside the transmit module end of the modem, and the signals I TX.FLT and Q TX.FLT are output from the output end of the transmit module end, and such that the complex signal relationship S TX.FLT = I TX.FLT + jQ TX.FLT is satisfied; Determining the signals I RX.FLT.in and Q RX.FLT.in input from the output end of the transmit module end to the receive module end of the modem, and such that the complex signal relationship S RX.FLT.in = I RX.FLT.in + jQ RX.FLT.in = S TX.FLT is satisfied; Determine the above-mentioned signal I RX.FLT.in and Q RX.FLT.in After being filtered, gain-adjusted, and analog-to-digital converted inside the receiving module of the above-mentioned modem, they are converted into signal I RX.BB and Q RX.BB , and make it satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB , the above-mentioned signal I RX.BB and Q RX.BB Finally transmitted to the receiving digital baseband signal processing module of the above-mentioned modem; Adjust and determine the output signals I' TX.BB and Q' TX.BB transmitted by the transmitting digital baseband signal processing module of the above-mentioned modem, and make it 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 above-mentioned signal I' TX.BB and Q' TX.BB After being digital-to-analog converted, filtered, and gain-adjusted inside the transmitting module of the above-mentioned modem, they are converted into output signals I' TX.FLT and Q' TX.FLT , and the above-mentioned signal I' TX.FLT and Q' TX.FLT are output from the output end of the transmitting module, and make it satisfy the complex signal relationship S' TX.FLT =I' TX.FLT +jQ' TX.FLT ; Determine the output signals I' RX.FLT.in and Q' RX.FLT.in input from the output end of the transmitting module to the receiving module of the above-mentioned modem, where it satisfies 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 ; Determine the above-mentioned signal I' RX.FLT.in and Q' RX.FLT.in After being filtered, gain-adjusted, and analog-to-digital converted inside the receiving module of the above-mentioned modem, they are converted into signal I' RX.BB and Q' RX.BB , and make it satisfy the complex signal relationship S' RX.BB =I'RX.BB +jQ’ RX.BB , the above signal I’ RX.BB and Q’ RX.BB are finally transmitted to the received digital baseband signal processing module of the above modem; According to the signals I RX.BB and Q RX.BB received by the received digital baseband signal processing module of the above modem RX.BB and the signals I’ RX.BB and Q’

[0018] Furthermore, in some embodiments, the method for detecting the mismatch of the above modem further includes: The output signals I TX.BB and Q TX.BB transmitted by the transmitted digital baseband signal processing module of the above modem TX.BB satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB = ; The above signals I TX.BB and Q TX.FLT after being converted through digital-to-analog conversion, filtering and gain adjustment inside the transmitting module end of the above modem, the output signals I TX.FLT and Q S TX.FLT =I TX.FLT +jQ TX.FLT = , where K T represents the gain after digital-to-analog conversion, filtering and gain adjustment sent by the above transmitted digital baseband signal processing module, and φ T represents the phase delay after digital-to-analog conversion, filtering and gain adjustment sent by the above transmitted digital baseband signal processing module; The signals I RX.FLT.in and Q RX.FLT.in input from the output end of the transmitting module end to the receiving module end of the above modem RX.FLT.in satisfy the complex signal relationship S RX.FLT.in =I RX.FLT.in +jQ TX.FLT =S RX.FLT.in ; The above signals I RX.FLT.in and Q RX.BB after being converted through filtering, gain adjustment and analog-to-digital conversion inside the receiving module end of the above modem, the signals I RX.BB and Q RX.BB =IRX.BB +jQ RX.BB and satisfy S RX.BB = , where K R represents the gain after filtering, gain adjustment, and analog-to-digital conversion inside the receiving module end above, and φ R represents the phase delay after filtering, gain adjustment, and analog-to-digital conversion inside the receiving module end above.

[0019] Furthermore, in some embodiments, the method for detecting the modem mismatch further includes: Adjusting and determining the output signals I’ TX.BB and Q’ TX.BB transmitted by the transmission digital baseband signal processing module of the above modem to satisfy the complex signal relationship S’ TX.BB = I’ TX.BB + jQ’ TX.BB = jS* TX.BB = Q TX.BB + jI TX.BB = ; The above signals I’ TX.BB and Q’ TX.BB are converted into output signals I’ TX.FLT and Q’ TX.FLT after digital-to-analog conversion, filtering, and gain adjustment inside the transmission module end of the above modem to satisfy the complex signal relationship S’ TX.FLT = I’ TX.FLT + jQ’ TX.FLT = ; The output signals I’ RX.FLT.in and Q’ RX.FLT.in input from the output end of the above transmission module end by the receiving module end of the above modem 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 above signals I’ RX.FLT.in and Q’ RX.FLT.in are converted signals I’ RX.BB and Q’RX.BB Satisfy the complex signal relationship S' RX.BB = I' RX.BB + jQ' RX.BB And satisfy S' RX.BB = 。

[0020] Further, in some embodiments, the method for detecting the modem mismatch further includes: According to the signals I RX.BB and Q RX.BB converted after filtering, gain adjustment, and analog-to-digital conversion inside the receiving module, RX.BB and the signals I' RX.BB and Q' RX.BB and satisfy the complex signal relationship S RX.BB = I RX.BB + jQ RX.BB and S' RX.BB = I' RX.BB + jQ' RX.BB to obtain and ; Thereby obtaining four mismatch parameters of the baseband analog mismatch, namely 。

[0021] In the fourth aspect of the present disclosure, a method for calibrating a modem mismatch is provided, which includes: Obtaining the four mismatch parameters of the baseband analog mismatch of the modem according to the above detection method; Constructing a corresponding first-stage or multi-stage equalizer in the digital domain of the modem to eliminate the above four mismatch parameters.

[0022] The present disclosure has the following beneficial effects compared with the prior art: The present disclosure does not need to introduce too many additional external detection and calibration devices, makes full use of the basic circuit or module itself, and respectively processes and transforms the received signal by adjusting the transmitted signal of the transmit digital baseband signal processing module and correspondingly adjusting the operating state of the switching module, realizes the detection of the phase and amplitude offsets caused by the mismatch between the transmit module and the receive module, and compensates for the detected mismatch amount in the digital transmission section to remove the influence of these offsets, thereby increasing the data transmission rate of the modem, especially for wideband modems, and even helping to reduce the interference signal strength of the modem and improve the image frequency rejection ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] With reference to the accompanying drawings and the following detailed description, the above and other features, advantages, and aspects of the embodiments of the present disclosure will become more apparent, where: Figure 1 Shows a schematic diagram of the basic architecture of a modem according to an embodiment of the present disclosure; Figure 2 Shows a schematic diagram of a modem mismatch detection device according to an embodiment of the present disclosure; Figure 3 Shows a schematic diagram of the switching module of a modem mismatch detection device in a first state according to some embodiments of the present disclosure; Figure 4 Shows a schematic diagram of the switching module of a modem mismatch detection device in a second state according to some embodiments of the present disclosure; Figure 5 Shows a flowchart of a modem mismatch detection method according to an embodiment of the present disclosure; and Figure 6 Shows a schematic diagram of a modem mismatch detection device according to some other embodiments of the present disclosure; In each of the drawings, the same or corresponding reference numerals represent the same or corresponding parts. Detailed Embodiments

[0024] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0025] In the description of the embodiments of the present disclosure, the term "including" and its like should be understood as open inclusion, that is, "including but not limited to". The term "based on" should be understood as "at least partially based 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. There may be other explicit and implicit definitions hereinafter.

[0026] It should be noted that in the embodiments of the present disclosure, for the modems involved, especially the receivers or transmitters of the modems, they can be circuits provided on a chip, or devices or systems composed of multiple corresponding modules. Additionally, in some embodiments of the present disclosure, the transmit module end of the modem includes a Transmit Digital Baseband Signal Processing module, a digital-to-analog conversion module, a transmit-end filtering module, and a transmit output end. The corresponding signals are sent out by the Transmit Digital Baseband Signal Processing module and sequentially pass through the digital-to-analog conversion module, the transmit-end filtering module, and the transmit output end. One or more gain adjustment units (such as several stages of amplifiers) can be provided between the Transmit Digital Baseband Signal Processing module and the digital-to-analog conversion module, between the digital-to-analog conversion module and the transmit-end filtering module, and between the transmit-end filtering module and the transmit output end. Of course, each of the above modules can also be gain-adjustable (for example, the transmit-end filtering module can also be a transmit-end analog variable gain and channel filtering module, and its filtering module itself has the function of adjusting the gain of the passing signal). Similarly, in some embodiments of the present disclosure, the receive module end of the modem includes a receive input end, a receive-end filtering module, an analog-to-digital conversion module, and a Receive Digital Baseband Signal Processing module. The corresponding signals (for example, they can come from a switching module) are received by the receive input end and sequentially pass through the receive-end filtering module, the analog-to-digital conversion module, and the Receive Digital Baseband Signal Processing module (that is, finally received by the Receive Digital Baseband Signal Processing module). One or more gain adjustment units (such as several stages of amplifiers) can be provided between the receive input end and the receive-end filtering module, between the receive-end filtering module and the analog-to-digital conversion module, and between the analog-to-digital conversion module and the Receive Digital Baseband Signal Processing module. Of course, each of the above modules can also be gain-adjustable (for example, the receive-end filtering module can also be a receive-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 the function of adjusting the signal gain in addition to the analog-to-digital conversion function). In addition, in the embodiments of the present disclosure, the transmit output end and / or the receive input end defined in the above embodiments can be considered as the baseband part of the modem. The mismatch problem of this part can be considered as a baseband mismatch problem. In the present disclosure, the baseband mismatch problem is mainly caused by problems of the filtering module (for example, a filter or the above-mentioned transmit-end filtering module, receive-end filtering module). Correspondingly, the mismatch problem of the modem also involves a radio frequency mismatch problem. In the present disclosure, the radio frequency mismatch problem is mainly caused by problems of the mixers at the transceiver ends.

[0027] Generally, to solve the modem mismatch, one can start from the hardware and use high-performance analog devices (filters, amplifiers, analog-to-digital and digital-to-analog converters, mixers, etc.). Although high-performance analog devices can fundamentally suppress the mismatch effects of the I and Q channels, they are generally larger in size and higher in cost, correspondingly increasing the power consumption and cost of mobile transceiver devices. In particular, even using high-performance analog devices cannot completely suppress the mismatch of the I and Q channels because the actual manufacturing process can only approximate the theoretical performance and cannot truly reach it. Moreover, the ability of actual devices to suppress the mismatch of the I and Q channels varies in different environments (temperature, humidity, etc.). Therefore, suppressing the mismatch problem of the I and Q channels in the analog domain is very practical. If not starting from the analog domain, the mismatch can also be suppressed and compensated in the digital domain (i.e., the digital section of the modem) through digital signal processing means. It should also be understood that the solutions to solve the mismatch of the analog baseband part can be as follows: 1) Detect the mismatch parameters of the chip's transmitted signal through an external test instrument and then write them into the non-volatile programmable device inside the chip (such as efuse, otp, flash, etc.); 2) Transmit a signal to the chip through an external RF signal source, and the chip internally detects the mismatch parameters of the baseband received signal and then writes them into the non-volatile programmable device inside the chip; 3) There is an additional frequency phase-locked loop circuit inside the chip dedicated to generating RF signals. After the chip is powered on, it is used to detect the mismatch of the receiving link. 4) There are additional detectors inside the chip. After the chip is powered on, it is used to detect the mismatch of the transmitting link. 5) After the transmitting link is calibrated, as a quasi-ideal signal source, loop back to detect the receiving link. 6) After the receiving link is calibrated, as a quasi-ideal receiver, loop back to detect the transmitting link. 7) Add a phase shift operation to the RF local oscillator signal to decouple the mismatch of the transmitting and receiving links, etc. The detected mismatch parameters will be correspondingly configured into the digital baseband transceiver mismatch compensation circuit, so that the compensated receiving / transmitting link achieves the effect of no mismatch. The detected mismatch parameters will be correspondingly configured into the digital baseband transceiver mismatch compensation circuit, so that the compensated receiving / transmitting link achieves the effect of no mismatch. Each of the various detection methods listed above either requires external instruments plus internal non-volatile programmable devices, with high implementation costs and test costs and poor adaptability to environmental factors such as temperature; or requires additional complex circuits, with high implementation costs, poor detection accuracy, and low detection efficiency; or there are errors in the implementation of the phase shift operation, thus limiting the detection accuracy; or the mismatch detection amounts of the RF and analog baseband are mixed together, resulting in poor overall mismatch detection accuracy in the passband.

[0028] It should be noted that whenever the gain of the transmitter or receiver of the modem changes, recalibration is required. The following embodiments are all based on the situation where calibration is performed after the gain is adjusted, and whenever the gain and bandwidth are re-determined, recalibration is required. It should also be understood that the parameter descriptions in some embodiments in the context of the present disclosure are as follows: I: the first letter of in-phase; Q: the first letter of quadrature; S*: the conjugate of signal S; S’: the signal form in another configuration, to distinguish from signal S in the original configuration; : The angular frequency of the baseband single-tone signal; : Indexed as of the angular frequency of the baseband single-tone signal; : The angular frequency of the RF local oscillator signal; : The natural constant; : Index (=1, 2, 3....); : The imaginary unit; : Time; Re(): The operation of taking the real part of a complex number; Im(): The operation of taking the imaginary part of a complex number; | |: The operation of taking the modulus; S TX.BB : The digital baseband complex transmit signal; S RX.BB : The digital baseband complex receive signal; S TX.FLT : The complex output signal of the transmit analog filter; S RX.FLT.in : The complex input signal of the receive analog filter; K T : The gain after the signal passes through digital-to-analog conversion, filtering, and gain adjustment in the transmit link (or refers to the gain of the entire transmit link); φ T : The phase delay after the signal passes through digital-to-analog conversion, filtering, and gain adjustment in the transmit link; K R : The gain after the signal passes through filtering, gain adjustment, and analog-to-digital conversion in the receive link (or refers to the gain of the entire receive link); φ R : The phase delay after the signal passes through filtering, gain adjustment, and analog-to-digital conversion in the receive link; K A : The gain of the RF attenuation; : The real part of the image component caused by the mismatch in the transmit link (or refers to the amplitude mismatch of the transmit RF local oscillator signal); : The imaginary part of the image component caused by the mismatch in the transmit link (or refers to the angular mismatch of the transmit RF local oscillator signal); : The real part of the image component caused by the mismatch in the receive link (or refers to the amplitude mismatch of the receive RF local oscillator signal); : The imaginary part of the image component caused by the mismatch in the receive link (or refers to the angular mismatch of the receive RF local oscillator signal); : The image component caused by the mismatch in the entire transmit & receive link; : Indexed as , the positive-sideband image component caused by the mismatch in the entire transmit & receive link; : Index is , the negative sideband image component caused by the mismatch of the entire transmit & receive link; : The amplitude of the complex signal; : Index is , the amplitude of the positive sideband complex tone signal; : Index is , the amplitude of the negative sideband complex tone signal; : Ideal complex transmit local oscillator signal; : Complex transmit local oscillator signal with mismatch; : Ideal complex receive local oscillator signal; : Complex receive local oscillator signal with mismatch; : The phase of the complex transmit local oscillator signal; : The phase of the complex receive local oscillator signal; : Real transmit RF signal; S TX.RF.poly : Complex RF output signal after the real transmit RF signal passes through the polyphase filter; : Complex output signal of the receive mixer.

[0029] Thus, in order to detect the mismatch in the baseband part of the modem, the exemplary embodiments of the present disclosure propose a detection device for modem mismatch. The device includes an additional switching module and the original baseband part inside the modem. Then, the device only needs to set a switching module with different operating states inside it and cooperate with corresponding signal transmission modes in different states to be able to borrow the modules of the original modem to extract the key parameters of the mismatch, and by compensating for the mismatch, the signal quality can be improved. Correspondingly, the present disclosure also proposes a detection method for modem mismatch, and this method can be based on the above detection device for modem mismatch. Correspondingly, for the detected mismatch in the baseband part, especially for the extracted key parameters of the mismatch, in some embodiments of the present disclosure, a modem calibration method is also specifically designed and a modem calibration device for some embodiments is given. The following will be described one by one in conjunction with the content of the drawings.

[0030] Figure 1 Shows a schematic diagram of the basic architecture of a modem according to an embodiment of the present disclosure. In the illustrated embodiment, the lower part of the illustration shows the transmitter part, and the upper part of the illustration shows the receiver part, and signal transmission and reception identifications are given. As shown in the illustrated embodiment, two signals are sent out by the transmit digital baseband signal processing module, where the transmit signals I TX.BB and Q TX.BB satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BBObviously, after the transmitted signal is sent out by the transmitting digital baseband signal processing module, it successively passes through the digital-to-analog conversion module (e.g., DAC), the transmitting end filtering module (e.g., the transmitting end analog variable gain and channel filtering module), the transmitting end mixer (local oscillator signal LO), and the combiner (e.g., adder) and converges. Then, it is amplified by the power amplifier (PA); at this time, the signal is sent 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 by the low-noise amplifier (LNA) to two receiving end mixers (local oscillator signal LO), and then passes through the receiving end filtering module (e.g., the receiving end analog variable gain and channel filtering module), the analog-to-digital conversion module (e.g., ADC), and finally the signals I RX.BB and Q RX.BB are received by the receiving digital baseband signal processing module, where the two signals I RX.BB and Q RX.BB satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB . In the illustrated embodiment, the signal I TX.BB can also be called the real part signal, and the signal Q TX.BB is the imaginary part signal. Of course, the two signals sent out by the transmitting digital baseband signal processing module are two real signals themselves, and only the complex signal relationship is used for theoretical explanation. The following is used to illustrate the signal input and output of each module or device. In the illustrated embodiment, the input signals of the digital-to-analog conversion module (e.g., DAC) are I TX.BB and Q TX.BB , and the corresponding output signals are I TX.DAC and Q TX.DAC , and satisfy the complex number relationship S TX.DAC =I TX.DAC +jQ TX.DAC ; the input signals of the transmitting end filtering module are I TX.DAC and Q TX.DAC , and the corresponding output signals are I TX.FLT and Q TX.FLT , and satisfy the complex number relationship S TX.FLT =I TX.FLT +jQ TX.FLT ; the input signals of the transmitting end mixer (local oscillator signal LO) are I TX.FLT and Q TX.FLT , and after passing through the illustrated transmitting end mixer, the two signals converge through the combiner (adder) and are output as V TX.RF.MIX ; the input signal of the power amplifier (e.g., PA) is V TX.RF.MIX , and the corresponding output signal is V TX.RF ; the input signal of the three-way switching module is V TX.RF , and the corresponding output signal to the antenna is VTX.ANT ; and the signal V TX.ANT can be emitted outward by the antenna. Correspondingly, in the illustrated embodiment, the antenna receives and sends the signal V to the inside of the transceiver TX.ANT ; the signal V TX.ANT becomes the signal V through the three-way switching module RX.RF ; the input signal V of the low-noise amplifier (LNA) at the receiver end RX.RF , and the corresponding output signal is V RX.RF.LNA ; the signal V RX.RF.LNA is divided into upper and lower paths and outputs two signals I RX.MIX and Q RX.MIX through the receiving mixer (local oscillator signal LO). In particular, these two signals satisfy the complex relationship S RX.MIX =I RX.MIX +jQ RX.MIX ; the input signals of the receiving filter module are I RX.MIX and Q RX.MIX , and the corresponding output signals are I RX.FLT and Q RX.FLT , and satisfy the complex relationship S RX.FLT =I RX.FLT +jQ RX.FLT ; the input signals of the analog-to-digital conversion module (e.g., ADC) are I RX.FLT and Q RX.FLT , and the corresponding output signals are I RX.BB and Q RX.BB , and satisfy the complex relationship S RX.BB =I RX.BB +jQ RX.BB ; thus, the two signals I RX.BB and Q RX.BB finally enter the receiving digital baseband signal processing module. It should be noted that in some embodiments, the two signals are sent out by the transmitting digital baseband signal processing module, where each of the two signals in the transmitted signals I TX.BB and Q TX.BB can still be further divided into two sub-level differential signals, that is, the transmitted signal I is transmitted by two pairs of differential signals TX.BB , and the transmitted signal Q is transmitted by two sub-level pairs of differential signals TX.BB ; for example, if it is necessary to transmit the transmitted signal -I TX.BB , then as long as the differential signals emitted by the two sub-levels of the original emitted I TX.BB are exchanged (the I-path differential is reversed); for example, if it is necessary to transmit the transmitted signal -Q TX.BB , then as long as the differential signals emitted by the two sub-levels of the original emitted Q TX.BB are exchanged (the Q-path differential is reversed).

[0031] Then, the following will explain the corresponding modem mismatch detection device in combination with the accompanying drawings and embodiments.

[0032] Figure 2 The schematic diagram of the modem mismatch detection device according to an embodiment of the present disclosure is shown. In the illustrated embodiment, with Figure 1The difference in the embodiments is that a break switch is provided between the transmitter - side filter and the transmitter - side mixer at the transmitter end to be able to disconnect the signal from continuing to be transmitted to the backend (disconnect the baseband part and the RF part of the transmitter); correspondingly, a break switch is also provided between the receiver - side filter and the receiver - side mixer at the receiver end to be able to disconnect the baseband part and the RF part of the receiver; in addition, in the illustrated embodiment, the downlink transmitter baseband part can be set as the transmitter module end, and this transmitter module end includes a transmitting digital baseband signal processing module, a digital - to - analog conversion module, and a transmitter - side filtering module; while the uplink receiver baseband part can be set as the receiver module end, and this receiver module end includes a receiver - side filtering module, an analog - to - digital conversion module, and a receiving digital baseband signal processing module. Further, in the illustrated embodiment, the output end of the uplink transmitter - side filtering module in the transmitter module end is set as the first transmitter end, and the output end of the downlink transmitter - side filtering module in the transmitter module end is set as the second transmitter end; correspondingly, the input end of the uplink receiver - side filtering module in the receiver module end is set as the first receiver end, and the input end of the downlink receiver - side filtering module in the receiver module end is set as the second receiver end; then, in the above - mentioned detection device, there is a switching module arranged between the transmitter module end and the receiver module end of the above - mentioned modem; and this switching module includes a first state and a second state. When the switching module is set to the first state, it can transmit the signal from the above - mentioned first transmitter end to the above - mentioned first receiver end and transmit the signal from the above - mentioned second transmitter end to the above - mentioned second receiver end; when the switching module is set to the second state, it can transmit the signal from the above - mentioned first transmitter end to the above - mentioned second receiver end and transmit the signal from the above - mentioned second transmitter end to the above - mentioned first receiver end. Correspondingly, to match the detection mismatch function of the detection device for the modem mismatch, the transmitting digital baseband signal processing module in the transmitter module end can include corresponding first and second states; when the transmitting digital baseband signal processing module is in the first state, the first digital transmitter end (e.g., the uplink in the two paths shown in the figure) of the transmitting digital baseband signal processing module emits an I signal, and the second digital transmitter end (e.g., the downlink in the two paths shown in the figure) of the transmitting digital baseband signal processing module emits a Q signal, where the complex - signal relationship S = I + jQ is satisfied; when the transmitting digital baseband signal processing module is in the second state, the first digital transmitter end (e.g., the uplink in the two paths shown in the figure) of the transmitting digital baseband signal processing module emits a Q signal, and the second digital transmitter end (e.g., the downlink in the two paths shown in the figure) of the transmitting digital baseband signal processing module emits an I signal, where the complex - signal relationship S' = Q + jI = jS* is satisfied; further, when the transmitting digital baseband signal processing module is set to the first state, the switching module is also set to its first state; and when the transmitting 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 first digital transmitting end emits a first digital signal I and the second digital transmitting end emits a second digital signal Q. At this time, the switching module is set to the first state, and the two signals emitted by the transmitting digital baseband signal processing module need to 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 emits the second digital signal Q and the second digital transmitting end emits the first digital signal I, so that when 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.

[0033] Furthermore, in some embodiments, the first digital transmitting end further includes a first digital transmitting P end and a first digital transmitting N end, where the first digital transmitting P end and the first digital transmitting N end can be used to output a pair of differential signals. For example, when the first digital transmitting end emits the first digital signal I, the first digital transmitting P end outputs one of the differential signals I + , and the first digital transmitting N end can output the other differential signal I - , and then the signal I + and the signal I - form a corresponding pair of differential signals, and the result of the first digital transmitting end emitting the first digital signal I is achieved. Correspondingly, 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 a pair of differential signals (for example, the signal Q + and the signal Q - ).

[0034] 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 can be used to output a pair of 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 can be used to output a pair of 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 can be used to receive a pair of 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 can be used to receive a pair of differential signals.

[0035] Thus, further, in some refined embodiments, the switching module in the first state is configured to connect the first transmitting P terminal to the first receiving P terminal, connect the first transmitting N terminal to the first receiving N terminal, connect the second transmitting P terminal to the second receiving P terminal, and connect the second transmitting N terminal to the second receiving N terminal; 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).

[0036] Correspondingly, in some refined embodiments, the switching module in the second state is configured to connect the second transmitting P terminal to the first receiving P terminal, connect the second transmitting N terminal to the first receiving N terminal, connect the first transmitting P terminal to the second receiving P terminal, and connect the first transmitting N terminal to the second receiving N terminal; 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).

[0037] Further, 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 terminal to the first receiving P terminal, connect the second transmitting N terminal to the first receiving N terminal (i.e., only transmit the signal of the second transmitting end to the first receiving end without changing the differential phase of this path); connect the first transmitting P terminal to the second receiving N terminal, and connect the first transmitting N terminal to the second receiving P terminal (i.e., not only transmit the signal of the first transmitting end to the second receiving end, but also invert the differential of this path); such that the switching module in the third B state is configured to connect the second transmitting P terminal to the first receiving N terminal, connect the second transmitting N terminal to the first receiving P terminal (i.e., not only transmit the signal of the second transmitting end to the first receiving end, but also invert the differential of this path); connect the first transmitting P terminal to the second receiving P terminal, and connect the first transmitting N terminal to the second receiving N terminal (i.e., only transmit the signal of the first transmitting end to the second receiving end without changing the differential phase of this path).

[0038] Further, in some embodiments, when the first digital transmitting end sends out a second digital negative signal -Q (i.e., the differential of this path is inverted) and the second digital transmitting end sends out a first digital signal I (i.e., the differential of this path is not inverted), when the first digital signal I and the second digital negative signal -Q satisfy the complex signal relationship S3 = -Q + jI, the switching module is configured to be in the third state or the second state.

[0039] Further, in some embodiments, when the first digital transmitter emits the second digital signal Q (i.e., this differential path is not inverted) and the second digital transmitter emits the first digital negative signal -I (i.e., this differential path is inverted), when 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.

[0040] Figure 3 FIG. shows a schematic diagram of the switching module of the modem mismatch detection device according to some embodiments of the present disclosure being in the first state. In this exemplary embodiment, the switching module is in the first state, and at this time, the transmit digital baseband signal processing module of the modem is also in its first state. At this time, the output signals I TX.BB and Q TX.BB satisfy the complex signal relationship: S TX.BB = I TX.BB + jQ TX.BB = .

[0041] Figure 4 FIG. shows a schematic diagram of the switching module of the modem mismatch detection device according to some embodiments of the present disclosure being in the second state. In this exemplary embodiment, the switching module is in the second state, and at this time, the transmit digital baseband signal processing module of the modem is also in its second state. At this time, the output signals I' 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 = .

[0042] Then, for the modem mismatch detection device in the above embodiments, the following provides some corresponding embodiments of the modem mismatch detection method.

[0043] Figure 5 FIG. shows a flowchart of the modem mismatch detection method according to an embodiment of the present disclosure. In this exemplary embodiment, a modem mismatch detection method 500 is shown, which includes the following steps: Step 510, determining the output signals (for example, denoted as the first signal) I TX.BB and Q TX.BB emitted by the transmit digital baseband signal processing module of the modem, and making them satisfy the complex signal relationship S TX.BB = ITX.BB +jQ TX.BB ; Step 520, determine signal I TX.BB and Q TX.BB are converted into output signals (e.g., counted as the second signal) I TX.FLT and Q TX.FLT after digital-to-analog conversion, filtering, and gain adjustment inside the transmission module end of the modem, and signal I TX.FLT and Q TX.FLT are output from the output end of the transmission module end, and satisfy the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT ; Step 530, determine that the input signal (e.g., counted as the third signal) I RX.FLT.in and Q RX.FLT.in from the output end of the transmission module end at the receiving module end of the modem, 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 are converted into signals (e.g., counted as the fourth signal) I RX.BB and Q RX.BB after filtering, gain adjustment, and analog-to-digital conversion inside the receiving module end of the modem, and satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB , and signal I RX.BB and Q RX.BB are finally transmitted to the receiving digital baseband signal processing module of the modem; Step 550, adjust and determine the output signals (e.g., counted as the fifth signal) I' TX.BB and Q' TX.BB transmitted by the transmitting digital baseband signal processing module of the modem, and satisfy the complex signal relationship: S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB ; Step 560, determine signal I' TX.BB and Q' TX.BB are converted into output signals (e.g., counted as the sixth signal) I' TX.FLT and Q' TX.FLT after digital-to-analog conversion, filtering, and gain adjustment inside the transmission module end of the modem, and signal I' TX.FLT and Q' TX.FLTOutput from the output terminal of the transmitting module, and making it satisfy the complex signal relationship S’ TX.FLT = I’ TX.FLT + jQ’ TX.FLT ; Step 570, determine that the input of the receiving module of the modem from the output terminal of the transmitting module is the output signal (for example, counted as the seventh signal) I’ RX.FLT.in and Q’ RX.FLT.in , where it satisfies 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 ; Step 580, determine the signals I’ RX.FLT.in and Q’ RX.FLT.in After being filtered, gain-adjusted, and analog-to-digital converted inside the receiving module of the modem, they are converted into signals (for example, counted as the eighth signal) I’ RX.BB and Q’ RX.BB , and making it satisfy the complex signal relationship S’ RX.BB = I’ RX.BB + jQ’ RX.BB , the signals I’ RX.BB and Q’ RX.BB are finally transmitted to the receiving digital baseband signal processing module of the modem; Step 590, according to the signals I RX.BB and Q RX.BB received by the receiving digital baseband signal processing module of the modem, as well as the signals I’ RX.BB and Q’ RX.BB to obtain four mismatch parameters of the baseband analog mismatch.

[0044] In particular, for the above step 510, in some embodiments, the output signals I TX.BB and Q TX.BB transmitted by the transmitting digital baseband signal processing module of the above modem satisfy the complex signal relationship: S TX.BB = I TX.BB + jQ TX.BB = ; In particular, for the above step 520, in some embodiments, the above signals I TX.BB and Q TX.BB After being converted through digital-to-analog conversion, filtering, and gain adjustment inside the transmitting module of the above modem, the output signals I TX.FLT and Q TX.FLT satisfy the complex signal relationship: S TX.FLT = ITX.FLT +jQ TX.FLT = ; In particular, for the above step 530, in some embodiments, the signal I input from the output end of the above transmission module end is received by the receiving module end of the above modem RX.FLT.in and Q RX.FLT.in satisfy the complex signal relationship: S TX.FLT.in =I TX.FLT.in +jQ TX.FLT.in =S TX.FLT ; In particular, for the above step 540, in some embodiments, the above signal I RX.FLT.in and Q RX.FLT.in After being filtered, gain adjusted, and analog-to-digital converted inside the receiving module end of the above modem, the converted signals I RX.BB and Q RX.BB satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB and satisfy the relationship: S RX.BB = .

[0045] In particular, for the above step 550, in some embodiments, the above output signal I' transmitted by the transmission digital baseband signal processing module of the above modem is adjusted and determined 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 = ; In particular, for the above step 560, in some embodiments, the above signal I' TX.BB and Q' TX.BB After being digital-to-analog converted, filtered, and gain adjusted inside the transmission module end of the above modem, they are converted into output signals I' TX.FLT and Q' TX.FLT satisfy the complex signal relationship: S' TX.FLT =I' TX.FLT +jQ' TX.FLT = ; In particular, for the above step 570, in some embodiments, the output signal I' input from the output end of the above transmission module end is received by the receiving module end of the above modemRX.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 = ; In particular, for the above step 580, in some embodiments, the above signal I' RX.FLT.in and Q' RX.FLT.in After being filtered, gain-adjusted, and analog-to-digital converted inside the receiving module of the above modem, the converted signals I' RX.BB and Q' RX.BB Satisfy the complex signal relationship: S' RX.BB = I' RX.BB + jQ' RX.BB And satisfy: S' RX.BB = .

[0046] In particular, for the above step 590, in some embodiments, according to the signals I RX.BB and Q RX.BB after being filtered, gain-adjusted, and analog-to-digital converted inside the receiving module, as well as the signals I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S RX.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 Perform FFT to obtain: , Normalize the negative sideband frequency components ( ), divide the amplitude by the amplitude at the corresponding frequency of the positive sideband ( ), and add the phase at the corresponding frequency of the positive sideband to obtain a series of complex values: ; Similarly, use the FFT method to extract the mismatch factor. For example, for S' RX.BB Perform similar operations, and then obtain: ; Based on the above relationship between D-i and D'-i, four mismatch parameters of the baseband analog mismatch are obtained, namely ; The four mismatch parameters of any single-tone transmission signal obtained above can be used to construct corresponding equalizers at the digital end of the modem to eliminate the above 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 above subscript i represents the index in a series of BB single-tone combinations, that is, the parameter with subscript i represents the single-tone parameter of the i-th frequency point; in addition, each frequency point corresponds to 4 mismatch parameters, and for N frequency points, there will be 4N mismatch parameters.

[0047] Furthermore, based on the above detection method, a calibration method for the modem mismatch is also provided. This method first needs to obtain the 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.

[0048] It should be understood that the mismatch of the modem can include the mismatch of the baseband part and can also include the mismatch of the radio frequency part. In the above embodiments, the detection and calibration of the mismatch of the baseband part (caused by, for example, filters) have been included. However, there is still a radio frequency segment mismatch in the modem (caused by, for example, mixers).

[0049] Figure 6 FIG. shows a schematic diagram of a modem mismatch detection device according to another embodiment of the present disclosure. In this exemplary embodiment, at the output backend of the power amplifier (PA) at the transmitter end, the output of the transmitter end of the power amplifier can be led to two signals (with a phase shift of π / 2 and a phase shift of 0) through a positive sideband polyphase filter and then transmitted to two mixer groups at the receiver end (two mixers in the upper group and two mixers in the lower group at the receiver end), and then the combined signal is transmitted to the baseband part at the receiver end (the receiving module end as described above).

[0050] It should be understood that the local oscillator signal for ideal upconversion (transmitter link mixer) is: , is the phase of the local oscillator signal. The form after considering the mismatch is: , where is the amplitude mismatch, is the angle mismatch. Then the digital baseband signal , after passing through an ideal analog transmit filter with a delay (the filter in the transmitter link): ; After passing through a non-ideal up-conversion mixer (the mixer in the transmitter link) and a power amplifier, an RF transmit signal is generated: Similarly, the ideal local oscillator signal for down-conversion (the mixer in the receiver link) is: , and the form after considering the mismatch is: After the non-ideal transmit single-tone signal passes through a non-ideal receive down-conversion mixer (the mixer in the receiver link), the result is: After passing through an ideal analog receive filter with a delay (the filter in the receiver link): Obviously, the mismatch amounts in the transmitter link and the receiver link are mixed together and cannot be separated.

[0051] To solve the problem that the above mismatch amounts cannot be separated, the following will, in combination with the accompanying drawings and embodiments, explain the calibration device for the mismatch of the corresponding modem. It should be noted that in Figure 6 the schematic embodiment, with Figure 2The difference in the embodiment is that an adjustment module is provided between the output end of the power amplifier in the transmitter link and the input end of the receiver baseband link (it should be understood that for the description of the adjustment module, the switch between the baseband link and the radio frequency link of the transmitter or receiver of the modem is closed). This adjustment module is used to sequentially perform radio frequency attenuation, positive sideband polyphase filtering, and mixing on the signal from the power amplifier and then input it into the receiver baseband link. It should be noted that the positive sideband polyphase filter immediately following the radio frequency 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 illustrated positive sideband polyphase filter is disconnected and the lower path is closed, it is the second state of the adjustment module. In addition, in the illustrated embodiment, the lower path transmitter baseband part can be set as the transmitter module end, and this transmitter module end includes a transmit digital baseband signal processing module, a digital-to-analog conversion module, and a transmitter end filter module. Correspondingly, the lower path transmitter link can also be set to send the signal from the transmit digital baseband signal processing module and sequentially pass through the digital-to-analog conversion module, the transmitter end filter module, the transmit mixing module, the combiner, the power amplifier, and the output end of the transmitter link; the upper path receiver baseband part can be set as the receiver module end (it can also be set as the receiver baseband link), and this receiver baseband link (receiver module end) includes a receiver end filter module, an analog-to-digital conversion module, and a receive 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 in 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 upper path input end shown in the figure (it can also be marked as the input end of the upper path receiver end filter module of the receiver baseband link as the first receiving end) and the lower path input end (it can also be marked as the input end of the lower path receiver end filter module of the receiver baseband link as the second receiving end). As shown in the illustrated embodiment, the radio frequency attenuation of the adjustment module is achieved through a radio frequency attenuator; the positive sideband polyphase filtering of the adjustment module is achieved through a positive sideband polyphase filter. The positive sideband polyphase filter has two outputs. If the upper output of the positive sideband polyphase filter is conducted, it is divided into a first mixer (local oscillator signal LO, the first mixer from top to bottom in the illustrated receiver link) and a second mixer (local oscillator signal LO, the second mixer from top to bottom in the illustrated receiver link). If the lower output of the positive sideband polyphase filter is conducted, it is divided into a third mixer (local oscillator signal LO, the third mixer from top to bottom in the illustrated receiver link) and a fourth mixer (local oscillator signal LO, the fourth mixer from top to bottom in the illustrated receiver link). 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.

[0052] 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.

[0053] Then, in the calibration device, a transmitter link and a receiver link are included, the transmitter link includes a transmitter baseband link, and the receiver link includes a receiver baseband link; an adjustment module is arranged between the output end of the power amplifier of the transmitter link and the input end of the receiver baseband link. The adjustment module includes a first state and a second state, and 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 signal I RX.MIX and signal Q RX.MIX , so that the complex signal relation 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 I' is obtained after being divided into two mixing paths. 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.

[0054] In some embodiments, the adjustment module is in the first state. That is, for calibrating the transmitter link first, the positive-sideband polyphase filter following the RF attenuator is divided into two paths. When both paths are closed, it is the first state of the adjustment module. At this time, the output signals I TX.BB and Q TX.BB emitted by the transmitted digital baseband signal processing module of the above-mentioned modem S TX.BB satisfy the complex signal relationship: TX.BB +jQ TX.BB = ; The signals I TX.BB and Q TX.BB obtain signals I TX.FLT and Q TX.FLT after passing through the digital-to-analog converter and the transmitter filter, and satisfy the complex signal relationship: S TX.FLT =I TX.FLT +jQ TX.FLT = ; The signals I TX.FLT and Q TX.FLT are output as signal V TX.RF after passing through the mixer, combiner, and power amplifier. Then, for the adjustment module in the first state, it is set to receive signal V TX.RF from the power amplifier, wherein, V TX.RF = = ; After signal V TX.RF successively undergoes RF attenuation (via the RF attenuator) and positive-sideband polyphase filtering (via the positive-sideband polyphase filter), signal V TX.RF is decomposed into signal I TX.RF.poly and signal Q TX.RF.poly , and satisfies the complex signal relationship: S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly , where I TX.RF.poly +jQ TX.RF.poly = ; The signals I TX.RF.poly and signal Q TX.RF.poly are respectively output as signal I RX.MIX and signal Q RX.MIX after being branched and mixed (via the mixer), such that the complex signal relationship is satisfied: S RX.MIX =I RX.MIX +jQ RX.MIX = ; Further, signal I RX.MIX and signal Q RX.MIX are converted into signals I RX.BB and Q RX.BB after being filtered (through the receiver filter) and analog-to-digital converted (through the analog-to-digital converter), and are finally transmitted to the receiving digital baseband signal processing module, where signals I RX.BB and Q RX.BB satisfy the complex signal relationship: S RX.BB = I RX.BB + jQ RX.BB = ; And obviously the above formula only contains the mismatch amounts of the transmitter link.

[0055] Further, in the previous embodiment, at the digital receiving end, the mismatch amount is detected by means of integration: ; ; Dividing the two formulas gives the detection quantity: , where is the phase shift of the transmit / receive analog filter and is a fixed quantity (not changing with time). Calibration in the digital domain at the transmitter end can make the detection quantity be 0, so that the transmit image calibration is completed, and the transmitted signal will be an ideal single-tone signal without image. The detection quantity seemingly contains two variables and , but in fact can be calculated, and then in the transmit calibration circuit, as long as the one-dimensional variable is scanned (iterated), and then the real and imaginary parts of are respectively assigned to the corresponding parameters in the transmit calibration circuit to make be 0, the transmit calibration is achieved. Thus, the transmitter link of the modem is calibrated, and then the receiver link of the modem needs to be calibrated.

[0056] 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 upper path of the positive-sideband polyphase filter is disconnected and the lower path is closed immediately after the RF attenuator. At this time, the output signal transmitted by the transmit digital baseband signal processing module of the above-mentioned modem passes through the digital-to-analog converter, the transmitter filter, and then through the mixer, the combiner, and the power amplifier and is output as signal V' TX.RF , and then signal V' TX.RFAfter performing radio frequency attenuation (via a radio frequency attenuator), positive sideband polyphase filtering (via a positive sideband polyphase filter) in sequence, it is divided into two paths and mixed (via a mixer) to obtain signal I'. RX.MIX and signal Q'. RX.MIX , such that the complex signal relationship S' RX.MIX = I' RX.MIX + jQ' RX.MIX is satisfied. Signal I' RX.MIX and Q' RX.MIX are transmitted to the receiver baseband link. In some embodiments, the adjustment module in the second state is configured to receive signal V' TX.RF from the power amplifier after the transmitter calibration is completed, where the relationship is satisfied: V' TX.RF = . Signal V' TX.RF After performing radio frequency attenuation and positive sideband polyphase filtering in sequence, it is divided into two paths and mixed to obtain signal I' RX.MIX and Q' RX.MIX , such that the complex signal relationship S' RX.MIX = I' RX.MIX + jQ' RX.MIX is satisfied, where I' RX.MIX + jQ' RX.MIX ; Further, signal I' RX.MIX and Q' RX.MIX are converted into signal I' RX.BB and Q' RX.BB via filtering (via a receiver filter) and analog-to-digital conversion (via an analog-to-digital converter), and finally transmitted to the receive digital baseband signal processing module, where signal I' RX.BB and Q' RX.BB satisfy the complex signal relationship: I' RX.BB + jQ' RX.BB = ; Obviously, the above formula only contains the mismatch amount of the receiver link.

[0057] Further, for the previous embodiment, at the digital receiver, the mismatch amount is detected by means of integration: ; ; Dividing the two formulas gives the detection amount: , calibration is performed in the digital domain at the receiving end to eliminate these two mismatches. Thus, the receiver link of the modem is calibrated, and then both the transmitter link and the receiver link of the entire modem are calibrated.

[0058] In some embodiments, a calibration method 600 for modem mismatch is also provided, which includes: Step 610, determining the output signals I TX.BB and Q TX.BB (the first signal) transmitted by the transmit digital baseband signal processing module of the above-mentioned modem, and making it satisfy the complex signal relationship S TX.BB = I TX.BB + jQ TX.BB ; Step 620, determining that the above signals I TX.BB and Q TX.BB are converted into signals I TX.FLT and Q TX.FLT (the second signal) after digital-to-analog conversion and filtering through the transmitter link of the above-mentioned modem, and making it satisfy the complex signal relationship S TX.FLT = I TX.FLT + jQ TX.FLT ; Step 630, determining that the above signals I TX.FLT and Q TX.FLT are converted into signal V TX.RF (the third signal) after mixing, combining, and power amplification through the transmitter link of the above-mentioned modem; Step 640, determining that the above signal V TX.RF is decomposed and converted into signals I TX.RF.poly and Q TX.RF.poly (the fourth signal) after radio frequency attenuation and positive sideband polyphase filtering, and making it satisfy the complex signal relationship: S TX.RF.poly = I TX.RF.poly + jQ TX.RF.poly ; Step 650, determining that the above signals I TX.RF.poly and Q TX.RF.poly are respectively converted into signals I RX.MIX and Q RX.MIX (the fifth signal) after splitting, mixing, and combining, and making it satisfy the complex signal relationship S RX.MIX = I RX.MIX + jQ RX.MIX ; Step 660, determining that the above signals I RX.MIX and Q RX.MIX are converted into signals I RX.BB and Q RX.BB (the sixth signal) after filtering and analog-to-digital conversion, and making it satisfy the complex signal relationship S RX.BB = I RX.BB + jQ RX.BB ; The above signals I RX.BB and Q RX.BBThe received digital baseband signal processing module that is finally transmitted to the above-mentioned modem; Step 670, according to the signals I received by the received digital baseband signal processing module of the above-mentioned modem RX.BB and Q RX.BB to obtain the transmitter link mismatch parameters, so as to eliminate the transmitter link mismatch parameters through the digital domain adjustment of the transmitter link of the above-mentioned modem.

[0059] Furthermore, for Step 610, in some embodiments, the output signals I TX.BB and Q TX.BB transmitted by the transmitted digital baseband signal processing module of the above-mentioned modem satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB = ; Furthermore, for Step 620, in some embodiments, the above signals I TX.BB and Q TX.BB after being converted by digital-to-analog conversion and filtering inside the transmitter module end of the above-mentioned modem, the converted signals I TX.FLT and Q TX.FLT satisfy the complex signal relationship: S TX.FLT =I TX.FLT +jQ TX.FLT = , where φ T represents the phase shift after filtering; Furthermore, for Step 630, in some embodiments, the signal V TX.RF converted after mixing, combining, and power amplification through the transmitter link of the above-mentioned modem satisfies the relationship: V TX.RF = = , where K T is the gain after mixing, combining, and power amplification through the transmitter link of the above-mentioned modem; Furthermore, for Step 640, in some embodiments, the signals I TX.RF.poly and Q TX.RF.poly decomposed and converted after radio frequency attenuation and positive sideband polyphase filtering satisfy the complex signal relationship: I TX.RF.poly +jQ TX.RF.poly = , where K A is the gain of radio frequency attenuation; Further, for step 650, in some embodiments, the signals I RX.MIX and Q RX.MIX after being split, mixed, and combined and then converted satisfy the complex signal relationship: S RX.MIX = I RX.MIX + jQ RX.MIX = ; Further, for step 660, in some embodiments, the signals I RX.BB and Q RX.BB after being filtered and converted from analog to digital satisfy the complex signal relationship: S RX.BB = I RX.BB + jQ RX.BB = .

[0060] Further, in some embodiments, after eliminating the transmitter link mismatch parameters through digital domain adjustment of the transmitter link of the above-mentioned modem, that is, after completing step 670, the above-mentioned calibration method further includes: step 680, determining the output signal transmitted by the transmit digital baseband signal processing module of the above-mentioned modem, which is converted into signal V' after digital-to-analog conversion, filtering, mixing, combining, and power amplification through the transmitter link of the above-mentioned modem TX.RF ; step 690, determining that the above-mentioned signal V' TX.RF is converted into signals I' RX.MIX and Q' RX.MIX after radio frequency attenuation, positive sideband polyphase filtering, and then splitting and mixing, and making them satisfy the complex signal relationship: S' RX.MIX = I' RX.MIX + jQ' RX.MIX ; step 692, determining that the above-mentioned signals I' RX.MIX and Q' RX.MIX are converted into signals I' RX.BB and Q' RX.BB after filtering and analog-to-digital conversion, and making them satisfy the complex signal relationship S' RX.BB = I' RX.BB + jQ' RX.BB , and the above-mentioned signals I' RX.BB and Q' RX.BB are finally transmitted to the receive digital baseband signal processing module of the above-mentioned modem; step 694, obtaining the receiver link mismatch parameters according to the signals I' RX.BB and Q' RX.BB received by the receive digital baseband signal processing module of the above-mentioned modem, so as to eliminate the receiver link mismatch parameters through digital domain adjustment of the receiver link of the above-mentioned modem.

[0061] Further, for step 680, in some embodiments, the output signal transmitted by the transmitting digital baseband signal processing module of the above-mentioned modem is converted after digital-to-analog conversion and filtering through the transmitter link of the above-mentioned modem, and then converted after mixing, combining, and power amplification through the transmitter link of the above-mentioned modem to obtain signal V'. TX.RF Satisfies the relationship: V' TX.RF = ; Further, for step 690, in some embodiments, the signal I' converted after radio frequency attenuation, positive sideband polyphase filtering, and then after splitting and mixing RX.MIX and Q' RX.MIX Satisfy the complex signal relationship: I' RX.MIX +jQ' RX.MIX ; Further, for step 692, in some embodiments, the signal I' converted after filtering and analog-to-digital conversion RX.BB and Q' RX.BB Satisfy the complex signal relationship: I' RX.BB +jQ' RX.BB 。

[0062] The above has described the embodiments of the present disclosure. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the disclosed embodiments.

[0063] The above are only optional embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, the present disclosure may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A detection device for modem mismatch, characterized in that the detection device includes a switching module disposed 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.

2. The detection device according to claim 1, characterized in that the transmitting module end is configured to issue a signal from a transmitting digital baseband signal processing module and sequentially pass through a digital-to-analog conversion module, a 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 through a receiving end filtering module, an analog-to-digital conversion module, and a 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 issues a first digital signal I and the second digital transmitting end issues a second digital signal Q, and 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 issues the second digital signal Q and the second digital transmitting end issues the first digital signal I, and 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, and the first digital transmitting P end and the first digital transmitting N end are used to output a pair of 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 a pair of 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 a pair of 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 a pair of differential signals; The first receiving end further includes a first receiving P terminal and a first receiving N terminal, and the first receiving P terminal and the first receiving N terminal are used for receiving paired differential signals; The second receiving end further includes a second receiving P terminal and a second receiving N terminal, and the second receiving P terminal and the second receiving N terminal are used for receiving paired differential signals.

5. The detection device according to claim 4, wherein The switching module in the first state is configured to connect the first transmitting P terminal to the first receiving P terminal, connect the first transmitting N terminal to the first receiving N terminal, connect the second transmitting P terminal to the second receiving P terminal, and connect the second transmitting N terminal to the second receiving N terminal; The switching module in the second state is configured to connect the second transmitting P terminal to the first receiving P terminal, connect the second transmitting N terminal to the first receiving N terminal, connect the first transmitting P terminal to the second receiving P terminal, and connect the first transmitting N terminal to the second receiving N terminal.

6. The detection device according to claim 5, wherein 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 terminal to the first receiving P terminal, connect the second transmitting N terminal to the first receiving N terminal, connect the first transmitting P terminal to the second receiving N terminal, and connect the first transmitting N terminal to the second receiving P terminal; The switching module in the third B state is configured to connect the second transmitting P terminal to the first receiving N terminal, connect the second transmitting N terminal to the first receiving P terminal, connect the first transmitting P terminal to the second receiving P terminal, and connect the first transmitting N terminal to the second receiving N terminal.

7. The detection device according to claim 6, wherein 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, and the first digital signal I and the second digital negative signal -Q satisfy the complex signal relationship S3 = -Q + jI, the switching module is configured to be in the third state or the second state; 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, and the first digital negative signal I and the second digital signal Q satisfy the complex signal relationship S4 = Q - jI, the switching module is configured to be in the third state or the second state.

8. An optimization device for modem mismatch, characterized in that Comprising: The detection device for modem mismatch according to any one of claims 1-7; One or more levels of 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 by using the detection device according to any one of claims 1-7, characterized in that, Comprising: Determine the output signal I transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q TX.BB , and satisfies the complex signal relation S TX.BB = I TX.BB + jQ TX.BB ; Determine the signal I TX.BB and Q TX.BB After digital-to-analog conversion, filtering, and gain adjustment inside the transmitting module terminal of the modem, they are converted into the signal I TX.FLT and Q TX.FLT , the signal I TX.FLT and Q TX.FLT are output from the output terminal of the transmitting module terminal and satisfy the complex signal relationship S TX.FLT = I TX.FLT + jQ TX.FLT ; Determine that the signal I input at the receiving module end of the modem comes from the output end of the transmitting module end RX.FLT.in and Q RX.FLT.in , and ensure that the complex signal relationship is satisfied 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 and gain adjustment inside the receiving module terminal of the modem and analog-to-digital conversion, it is converted into the signal I RX.BB and Q RX.BB , and makes the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB hold. The signal I RX.BB and Q RX.BB are finally transmitted to the receiving digital baseband signal processing module of the modem; Adjust and determine the output signals I’ TX.BB and Q’ TX.BB transmitted by the transmission digital baseband signal processing module of the modem, and ensure that the complex signal relationship is satisfied 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 digital-to-analog conversion, filtering, and gain adjustment inside the transmitter module terminal of the modem, they are converted into the output signals I’ TX.FLT and Q’ TX.FLT , and the signals I’ TX.FLT and Q’ TX.FLT are output from the output terminal of the transmitter module terminal and satisfy the complex signal relationship S’ TX.FLT = I’ TX.FLT + jQ’ TX.FLT ; Determine the output signals I’ and Q’ input at the receiving module end of the modem from the output end of the transmitting module end, where the complex signal relationship is satisfied. RX.FLT.in and Q’ RX.FLT.in where the complex signal relationship is satisfied 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 being filtered, gain-adjusted, and converted by analog-to-digital conversion through the receiving module end inside the modem, it is converted into the signal I’ RX.BB and Q’ RX.BB , and make it satisfy the complex signal relationship S’ RX.BB =I’ RX.BB +jQ’ RX.BB , the signal I’ RX.BB and Q’ RX.BB Finally transmitted to the receiving digital baseband signal processing module of the modem; According to the signals I RX.BB and Q RX.BB received by the received digital baseband signal processing module of the modem, RX.BB as well as signals I' RX.BB and Q' to obtain four mismatch parameters of baseband analog mismatch.

10. The detection method according to claim 9, wherein The output signals I TX.BB and Q TX.BB transmitted by the transmission digital baseband signal processing module of the modem satisfy the complex signal relationship S TX.BB = I TX.BB + jQ TX.BB = ; The signal I TX.BB and Q TX.BB The output signals I TX.FLT and Q TX.FLT which are converted after digital-to-analog conversion, filtering, and gain adjustment inside the transmitting module terminal of the modem 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, and φ T represents the phase delay after digital-to-analog conversion, filtering, and gain adjustment sent by the transmitting digital baseband signal processing module; The signals I RX.FLT.in and Q RX.FLT.in input from the output end of the transmitting module to the receiving module end of the modem satisfy 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 passing through filtering and gain adjustment inside the receiving module end of the modem and analog-to-digital conversion, the converted signal I RX.BB and Q RX.BB Satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB And satisfy S RX.BB = ， Among them, K R represents the gain after filtering, gain adjustment, and analog-to-digital conversion inside the receiving module end, and φ R represents the phase delay after filtering, gain adjustment, and analog-to-digital conversion inside the receiving module end.

11. The detection method according to claim 10, wherein Adjust and determine the output signals I’ TX.BB and Q’ TX.BB transmitted by the transmission digital baseband signal processing module of the modem to 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 undergoing digital-to-analog conversion, filtering, and gain adjustment within the transmitting module end of the said modem, are converted into output signals I’ TX.FLT and Q’ TX.FLT which satisfy the complex signal relationship S’ TX.FLT = I’ TX.FLT + jQ’ TX.FLT = ; The output signals I’ RX.FLT.in and Q’ RX.FLT.in from the output end of the transmitting module are input at the receiving module end of the modem and 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 satisfies S’ RX.FLT.in = jS’* TX.FLT = ; The signal I’ RX.FLT.in and Q’ RX.FLT.in After passing through filtering and gain adjustment inside the receiving module of the modem and analog-to-digital conversion, the converted signal I’ RX.BB and Q’ RX.BB Satisfy 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, wherein According to the signals I RX.BB and Q RX.BB after filtering, gain adjustment, and analog-to-digital conversion inside the receiving module end, RX.BB and signals I' RX.BB and Q' RX.BB = I RX.BB + jQ RX.BB and S' RX.BB = I' RX.BB + jQ' RX.BB , and then obtain and ; four mismatch parameters of the baseband analog mismatch are obtained, namely 。 13. A calibration method for modem mismatch, characterized in that, including: obtaining four mismatch parameters of the baseband analog mismatch of the modem according to the detection method as described in any one of claims 9-12; constructing a corresponding first-stage or multi-stage equalizer in the digital domain of the modem to eliminate the four mismatch parameters.

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