Modem mismatch calibration device, optimization device and calibration method thereof

Abstract

The present disclosure provides a calibration device, an optimization device and a calibration method for modem mismatch. The calibration device includes: a transmitter link and a receiver link, 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 is used to perform RF attenuation, positive sideband multi-phase filtering, and mixing on the signal from the power amplifier in sequence to input it into the receiver baseband link; the adjustment module includes a first state and a second state. In addition, a modem mismatch optimization device and a modem mismatch calibration method are also disclosed. The present disclosure internally sets an adjustment module with two working states, which can be used in conjunction with the signal transmission mode to borrow the original modem module to extract the key parameters of the mismatch, and improve the signal quality by first calibrating the transmitter link and then calibrating the receiver link.

Description

Technical Field

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

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

[0003] For example, RF local oscillator signal mismatch can significantly impact the system, manifesting as both amplitude mismatch and phase mismatch in the quadrature signals. These two mismatches typically have both static components and frequency-varying components.

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

[0005] The existing solution to RF mismatch involves generating a single tone using an independent RF PLL or an external signal source, feeding it into the RF receive chain. The receive chain mismatch is then calibrated in the digital domain. The transmit chain then transmits the single tone, and the mismatch is evaluated using a calibrated receive chain or external instrumentation. The transmit chain mismatch is then calibrated in the digital domain. The problem is that simply feeding the transmit signal into the receive chain cannot simultaneously calibrate the mismatch of the RF transmit and receive chains. Furthermore, this calibration process requires either external instrumentation or an independent RF PLL.

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

[0007] In order to solve at least one of the above problems and one or more of other potential problems, the present disclosure proposes a modem mismatch calibration device, an optimization device and a calibration method thereof, which only requires an adjustment module with two working states to be set up internally and cooperate with the signal transmission mode to borrow the module of the original modem to extract the key parameters of the mismatch, and improve the signal quality by compensating for the mismatch.

[0008] In a first aspect of the present disclosure, a modem mismatch calibration device is provided, comprising: a transmitter link and a receiver link, wherein the receiver link comprises a receiver baseband link; an adjustment module, disposed between an output end of a power amplifier of the transmitter link and an input end of the receiver baseband link, wherein the adjustment module is configured to sequentially perform radio frequency attenuation, positive sideband multiphase filtering, and frequency mixing on a signal from the power amplifier before inputting the signal to the receiver baseband link; the adjustment module comprises a first state and a second state, wherein the adjustment module in the first state is configured to adjust the signal V from the power amplifier to TX.RF After RF attenuation and positive sideband multiphase filtering, the above 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 above signal I TX.RF.poly And the above signal Q TX.RF.poly After being split and mixed, they are output as signals I RX.MIX and signal Q RX.MIX , so that the complex signal relationship S is satisfied RX.MIX =I RX.MIX +jQ RX.MIX , the above signal I RX.MIX And the above signal Q RX.MIX is transmitted to the receiver baseband link; the adjustment module of the second state is configured to complete the calibration signal V' from the power amplifier. TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , the above signal I' RX.MIX and the above signal Q' RX.MIX is transmitted to the above-mentioned receiver baseband link.

[0009] Furthermore, in some embodiments, the above-mentioned transmitter chain is configured to transmit the signal from the transmitting digital baseband signal processing module, and sequentially pass through the digital-to-analog conversion module, the transmitting end filtering module, the transmitting mixing module, the combiner, the power amplifier, and the output end of the above-mentioned transmitter chain; the above-mentioned transmitting digital baseband signal processing module includes a first digital transmitting end and a second digital transmitting end.

[0010] Furthermore, in some embodiments, the above-mentioned receiver baseband link is configured to receive the signal from the above-mentioned adjustment module from the input end of the above-mentioned receiver baseband link, and pass it through the receiving end filtering module, the analog-to-digital conversion module, and the receiving digital baseband signal processing module in sequence; the above-mentioned receiving digital baseband signal processing module includes a first digital receiving end and a second digital receiving end.

[0011] Furthermore, in some embodiments, the adjustment module in the first state is configured to receive the signal V from the power amplifier. TX.RF , where V TX.RF = = ,

[0012] The above signal V TX.RF After RF attenuation and positive sideband multiphase filtering, the above signal V TX.RF is decomposed into signal I TX.RF.poly and signal Q TX.RF.poly , and satisfies the complex signal relationship:

[0013] S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly ,in

[0014] I TX.RF.poly +jQ TX.RF.poly = ;

[0015] The above signal I TX.RF.poly And the above signal Q TX.RF.poly After being split and mixed, they are output as signals I RX.MIX and signal Q RX.MIX , so that the complex signal relationship is satisfied:

[0016] S RX.MIX =I RX.MIX +jQ RX.MIX = .

[0017] Furthermore, in some embodiments,

[0018] The adjustment module in the second state is configured to receive a signal V' from the power amplifier after the transmitter calibration is completed. TX.RF, where V' TX.RF = ,

[0019] The above signal V' TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , where I' RX.MIX +jQ' RX.MIX .

[0020] In a second aspect of the present disclosure, a modem mismatch optimization device is provided, which includes: the above-mentioned modem mismatch calibration device; a one-stage or multi-stage equalizer is arranged between the above-mentioned modem's transmitting digital baseband signal processing module and the digital-to-analog conversion module, and between the above-mentioned modem's receiving digital baseband signal processing module and the analog-to-digital conversion module.

[0021] In a third aspect of the present disclosure, a method for calibrating modem mismatch is provided, comprising:

[0022] Determine the output signal I transmitted by the transmit digital baseband signal processing module of the above-mentioned modem TX.BB and Q TX.BB , and satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ;

[0023] Determine the above signal I TX.BB and Q TX.BB After the digital-to-analog conversion and filtering of the transmitter link of the above-mentioned modem, it is converted into a signal I TX.FLT and Q TX.FLT , and satisfy the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT ;

[0024] Determine the above signal I TX.FLT and Q TX.FLT After the mixing, combining, and power amplification of the transmitter chain of the above-mentioned modem, it is converted into a signal V TX.RF ;

[0025] Determine the above signal V TX.RF After RF attenuation and positive sideband polyphase filtering, it is decomposed and converted into signal I TX.RF.poly and Q TX.RF.poly, and satisfy the complex signal relationship

[0026] S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly ;

[0027] Determine the above signal I TX.RF.poly and Q TX.RF.poly After being divided, mixed and combined, they are converted into signal I RX.MIX and Q RX.MIX , and satisfy the complex signal relationship S RX.MIX =I RX.MIX +jQ RX.MIX ;

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

[0029] According to the signal I received by the receiving digital baseband signal processing module of the above-mentioned modem RX.BB and Q RX.BB To obtain the transmitter link mismatch parameter, so as to eliminate the transmitter link mismatch parameter through digital domain adjustment of the transmitter link of the modem.

[0030] Furthermore, in some embodiments, in the above method,

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

[0032] The above signal I TX.BB and Q TX.BB The converted signal I after digital-to-analog conversion and filtering inside the transmitter module of the above-mentioned modem TX.FLT and Q TX.FLT Satisfies the complex signal relationship:

[0033] S TX.FLT =I TX.FLT +jQ TX.FLT= , where φ T Represents the phase shift after filtering;

[0034] The converted signal V after mixing, combining, and power amplification of the transmitter chain of the above-mentioned modem TX.RF Satisfaction relationship:

[0035] V TX.RF = = ,

[0036] Among them, K T is the gain after mixing, combining, and power amplification of the transmitter link through the above-mentioned modem;

[0037] After RF attenuation and positive sideband polyphase filtering, the decomposed and converted signal I TX.RF.poly and Q TX.RF.poly Satisfies the complex signal relationship:

[0038] I TX.RF.poly +jQ TX.RF.poly = ,

[0039] Among them, K A is the gain of RF attenuation;

[0040] The converted signal I after splitting, mixing and combining RX.MIX and Q RX.MIX Satisfies the complex signal relationship:

[0041] S RX.MIX =I RX.MIX +jQ RX.MIX = ;

[0042] The converted signal I after filtering and analog-to-digital conversion RX.BB and Q RX.BB Satisfies the complex signal relationship:

[0043] S RX.BB =I RX.BB +jQ RX.BB = .

[0044] Furthermore, in some embodiments, in the above method,

[0045] After eliminating the transmitter link mismatch parameter by digital domain adjustment of the transmitter link of the modem, the calibration method further comprises the steps of:

[0046] Determine the output signal transmitted by the digital baseband signal processing module of the modem, after the digital-to-analog conversion and filtering of the transmitter link of the modem, and then after the mixing, combining, and power amplification of the transmitter link of the modem, to be converted into a signal V' TX.RF ;

[0047] Determine the above signal V' TX.RF After RF attenuation, positive sideband polyphase filtering, and then branching and mixing, it is converted into signal I' RX.MIX and Q' RX.MIX , and satisfy the complex signal relationship:

[0048] S' RX.MIX =I' RX.MIX +jQ' RX.MIX ;

[0049] Determine the above signal I' RX.MIX and Q' RX.MIX After filtering and analog-to-digital conversion, it is converted into signal I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , the above signal I' RX.BB and Q' RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the above-mentioned modem;

[0050] According to the signal I' received by the receiving digital baseband signal processing module of the above-mentioned modem RX.BB and Q' RX.BB The receiver link mismatch parameter is obtained, and the receiver link mismatch parameter is eliminated by adjusting the digital domain of the receiver link of the modem.

[0051] Furthermore, in some embodiments, in the above method,

[0052] The output signal transmitted by the digital baseband signal processing module of the modem is converted into a signal V' after being subjected to digital-to-analog conversion and filtering by the transmitter link of the modem, and then subjected to mixing, combining, and power amplification by the transmitter link of the modem. TX.RF Satisfaction relationship:

[0053] V' TX.RF = ;

[0054] After RF attenuation, positive sideband polyphase filtering, and then branching and mixing, the converted signal I' RX.MIX and Q' RX.MIXSatisfies the complex signal relationship:

[0055] I' RX.MIX +jQ' RX.MIX ;

[0056] After filtering and analog-to-digital conversion, the converted signal I' RX.BB and Q' RX.BB Satisfies the complex signal relationship:

[0057] I' RX.BB +jQ' RX.BB .

[0058] Compared with the prior art, the present disclosure has the following beneficial effects:

[0059] The present disclosure makes full use of the basic circuit, and performs mismatch detection on the received signal by adjusting the transmission signal of the transmitting digital baseband signal processing module and the operating state of the corresponding adjustment module respectively; in particular, in some embodiments, by setting the first state of the adjustment module, the detection and separation of the mismatch parameters of the transmitter link and the receiver link are realized, and then calibration is performed in the digital domain of the transmitter link to eliminate the mismatch amount of the corresponding transmitter link, thereby completing the mismatch parameter calibration of the transmitter link first; then, by setting the second state of the adjustment module, the signal sent by the calibrated transmitter link is used to perform mismatch detection on the signal received by the receiver link to obtain the mismatch amount of the receiver link, and then calibration is performed in the digital domain of the receiver link, finally realizing the full mismatch detection and calibration of the transmitter link and the receiver link of the entire modem. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings, in which:

[0061] Figure 1 A schematic diagram of a basic architecture of a modem according to an embodiment of the present disclosure is shown;

[0062] Figure 2 A schematic diagram of a modem mismatch calibration device according to an embodiment of the present disclosure is shown;

[0063] Figure 3 A schematic diagram showing an adjustment module of a modem mismatch calibration apparatus in a first state according to some embodiments of the present disclosure is shown;

[0064] Figure 4 A schematic diagram showing an adjustment module of a modem mismatch calibration apparatus in a second state according to some embodiments of the present disclosure is shown;

[0065] Figure 5 A schematic diagram showing a modem mismatch calibration device according to other embodiments of the present disclosure is shown;

[0066] Figure 6 A flow chart illustrating a modem mismatch calibration method according to an embodiment of the present disclosure; and

[0067] In the various drawings, the same or corresponding reference numerals denote the same or corresponding parts. DETAILED DESCRIPTION

[0068] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0069] In the description of the embodiments of the present disclosure, the term "including" and similar terms should be understood as open inclusion, that is, "including but not limited to." The term "based on" should be understood as "based at least in part on." The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0070] It should be noted that in the embodiments of the present disclosure, the modem, and in particular the modem's receiver or transmitter, may be a circuit configured on a chip, or a device or system composed of multiple corresponding modules. Furthermore, in some embodiments of the present disclosure, the modem transmitter link and receiver link, wherein the receiver link includes a receiver baseband link, which is configured to transmit signals from a transmit digital baseband signal processing module, sequentially through a digital-to-analog conversion module, a transmitter filtering module, a transmit mixing module, a combiner, a power amplifier, and finally to the output of the transmitter link; the transmit digital baseband signal processing module includes a first digital transmitter and a second digital transmitter. Accordingly, the receiver baseband link is configured to receive signals from a receiver RF link at the receiver baseband link input, sequentially through a receiver filtering module, an analog-to-digital conversion module, and a receive digital baseband signal processing module; the receive digital baseband signal processing module includes a first digital receiver and a second digital receiver; and the receiver RF link generally includes a mixer, etc.

[0071] In addition, one or more gain adjustment units (e.g., several stages of amplifiers) may be provided in the transmitter and receiver chains. Of course, each module itself may also have adjustable gain (e.g., the transmitter filter module may also be a transmitter analog variable gain and channel filter module, wherein the filter module itself has the function of adjusting the gain of the passing signal). Furthermore, some modem mismatch issues may be considered baseband mismatch issues. In the present disclosure, baseband mismatch issues are primarily caused by issues with the filter module (e.g., the filter or the transmitter filter module or the receiver filter module described above). Accordingly, some modem mismatch issues also involve RF mismatch issues. In the present disclosure, RF mismatch issues are primarily caused by issues with the mixers at the transceiver end.

[0072] Modem mismatch can generally be addressed through hardware-based solutions, employing high-performance analog components (filters, amplifiers, analog-to-digital converters, mixers, etc.). While these components can fundamentally mitigate the effects of I and Q mismatch, they are generally larger and more expensive, which in turn increases the power consumption and cost of mobile transceivers. Furthermore, even high-performance analog components cannot completely mitigate I and Q mismatch. This is because actual manufacturing processes can only approximate theoretical performance, not truly achieve it. Furthermore, the ability of actual components to mitigate I and Q mismatch varies under different environmental conditions (such as temperature and humidity). Therefore, mitigating I and Q mismatch in the analog domain is particularly practical. Alternatively, digital signal processing can be used to mitigate and compensate for these mismatches in the digital domain (i.e., the digital section of the modem). It should be noted that the transmitter or receiver of the modem needs to be recalibrated every time the gain is changed. In the various embodiments of the present disclosure, calibration is performed after the gain is adjusted, and recalibration is required each time the gain and bandwidth are re-determined.

[0073] It should also be understood that in the context of the present disclosure, the parameters in some embodiments are described as follows: I: the abbreviation for in-phase; Q: the abbreviation for quadrature; S*: the conjugate of the signal S; S': the signal form in another configuration, to distinguish it from the signal S in the original configuration; : angular frequency of baseband single tone signal; : Index is The angular frequency of the baseband tone signal; : angular frequency of the RF local oscillator signal; : natural constant; :index(=1,2,3....); : imaginary unit; : time; Re(): operation of taking the real part of a complex number; Im(): operation of taking the imaginary part of a complex number; | |: modulus operation; S TX.BB : digital baseband complex transmission signal; S RX.BB : digital baseband complex received signal; S TX.FLT : Transmit analog filter complex output signal; S RX.FLT.in : Receive analog filter complex input signal; K T : The gain of the signal after digital-to-analog conversion, filtering and gain adjustment in the transmission chain (or the gain of the entire transmission chain); φ T : Phase delay of the signal after digital-to-analog conversion, filtering and gain adjustment in the transmission chain; K R: The gain of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain (or the gain of the entire receiving chain); φ R : Phase delay of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain; K A : gain of RF attenuation; : The real part of the image component caused by the mismatch of the transmission link (or the amplitude mismatch of the transmitted RF local oscillator signal); : The imaginary part of the image component caused by the mismatch of the transmission link (or the angle mismatch of the transmitted RF local oscillator signal); : The real part of the image component caused by the mismatch of the receiving link (or refers to the amplitude mismatch of the received RF local oscillator signal); : The imaginary part of the image component caused by the mismatch of the receiving link (or refers to the angular mismatch of the received RF local oscillator signal); : Image components caused by mismatch in the entire transmit and receive link; : Index is , positive sideband image component caused by mismatch in the entire transmission and reception link; : Index is , negative sideband image components caused by mismatch in the entire transmit and receive link; : amplitude of the complex signal; : Index is , the amplitude of the positive sideband complex tone signal; : Index is , the amplitude of the negative sideband complex tone signal; : ideal complex transmitted local oscillator signal; : There is a mismatched complex transmission local oscillator signal; : Ideal complex received local oscillator signal; : There is a mismatched complex received local oscillator signal; : The phase of the complex transmitted local oscillator signal; : The phase of the complex received local oscillator signal; : actual transmitted radio frequency signal; S TX.RF.poly : The complex RF output signal of the real transmitted RF signal after passing through the polyphase filter; : Receives the complex output signal of the mixer.

[0074] To detect radio frequency mismatch in a modem, exemplary embodiments of the present disclosure propose a modem mismatch calibration device. This device includes an additional adjustment module, located between the output of a transmitter power amplifier and the input of a receiver baseband link. The adjustment module sequentially performs radio frequency attenuation, positive sideband multiphase filtering, and frequency mixing on the signal from the power amplifier before inputting it into the receiver baseband link. The adjustment module must have a first state and a second state, and the device utilizes the adjustment module and existing internal components of the modem. This allows the device to simply include an adjustment module with two operating states and utilize existing modem modules to extract key mismatch parameters and compensate for the mismatch, thereby improving signal quality. Accordingly, the present disclosure also proposes a modem mismatch optimization device, which can be based on the aforementioned modem mismatch calibration device. Accordingly, in some embodiments of the present disclosure, a modem calibration method is specifically designed for the aforementioned modem mismatch calibration device. Each of these methods will be described in detail below with reference to the accompanying drawings.

[0075] Figure 1 The basic architecture diagram of the modem according to an embodiment of the present disclosure is shown. In this illustrated embodiment, the lower portion of the diagram is the transmitter portion, the upper portion of the diagram is the receiver portion, and the transmit and receive signals are marked. In the illustrated embodiment, two signals are sent by the transmit digital baseband signal processing module, wherein the transmit signal I TX.BB and Q TX.BB Satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB Obviously, after the transmit signal is sent out by the transmit digital baseband signal processing module, it passes through the digital-to-analog conversion module (for example, DAC), the transmit filter module (for example, the transmit analog variable gain and channel filter module), the transmit mixer (local oscillation signal LO), and the combiner (for example, the adder) in sequence, and then is amplified by the power amplifier (PA); at this time, the signal is transmitted to the antenna and propagates outward. Correspondingly, the signal from the antenna (in some embodiments, it can also come from the transmitter part) can be split to two receive mixers (local oscillation signal LO) through the low noise amplifier (LNA), and then passes through the receive filter module (for example, the receive analog variable gain and channel filter module), the analog-to-digital conversion module (for example, ADC), and the final signal I RX.BB and Q RX.BB The digital baseband signal processing module receives the two signals I RX.BB and Q RX.BB Satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BBIn this illustrated embodiment, the signal I TX.BB is the real part signal, signal Q TX.BB The two signals sent by the digital baseband signal processing module are actually two real signals. However, the complex signal relationship is used for the convenience of theoretical explanation. The following is used to illustrate the signal input and output of each module or device. In the embodiment shown in the figure, the input signal of the digital-to-analog conversion module (for example, DAC) is I TX.BB and Q TX.BB , the corresponding output signal is I TX.DAC and Q TX.DAC , and satisfy the complex relation S TX.DAC =I TX.DAC +jQ TX.DAC ; The input signal of the transmitter filter module is I TX.DAC and Q TX.DAC , the corresponding output signal is I TX.FLT and Q TX.FLT , and satisfy the complex relation S TX.FLT =I TX.FLT +jQ TX.FLT ; The input signal of the transmitter mixer (local oscillation signal LO) is I TX.FLT and Q TX.FLT , and after passing through the transmitter mixer shown in the figure, the two signals are combined by the combiner (adder) and output as V TX.RF.MIX ; The input signal of the power amplifier (for example, PA) is V TX.RF.MIX , the corresponding output signal is V TX.RF ; The input signal of the three-way switching module is V TX.RF , the output signal of the corresponding antenna is V TX.ANT ; while the signal V TX.ANT Correspondingly, in the illustrated embodiment, the antenna receives and sends a signal V to the inside of the transceiver. TX.ANT ; Signal V TX.ANT Through the three-way switching module to become the signal V RX.RF ; The input signal V of the low noise amplifier (LNA) at one end of the receiver RX.RF , the corresponding output signal is V RX.RF.LNA Signal V RX.RF.LNA The two signals are divided into upper and lower paths and output through the receiving mixer (local oscillation signal LO) as I RX.MIX and Q RX.MIX , in particular, the two signals satisfy the complex relationship S RX.MIX =I RX.MIX +jQ RX.MIX ; The input signal of the receiving end filter module is I RX.MIX and Q RX.MIX , the corresponding output signal is I RX.FLT and QRX.FLT , and satisfy the complex relation S RX.FLT =I RX.FLT +jQ RX.FLT ; The input signal of the analog-to-digital conversion module (for example, ADC) is I RX.FLT and Q RX.FLT , the corresponding output signal is I RX.BB and Q RX.BB , and satisfy the complex relation S RX.BB =I RX.BB +jQ RX.BB ; Thus the two signals I RX.BB and Q RX.BB Finally, it enters the receiving digital baseband signal processing module.

[0076] It should be understood that the ideal up-converter (transmitter link mixer) local oscillator signal is: , is the phase of the local oscillator signal. After considering the mismatch, the form is:

[0077] ,

[0078] in is the amplitude mismatch, is the angle mismatch. Then the digital baseband signal , after passing through an ideal analog transmit filter with delay (the filter of the transmitter chain): ;

[0079] After passing through the non-ideal up-conversion mixer (the mixer of the transmitter chain) and the power amplifier, the RF transmit signal is generated:

[0080]

[0081] Similarly, the ideal down-conversion (mixer in the receiver chain) local oscillator signal is: , after considering the mismatch, the form is:

[0082]

[0083] The result of a non-ideal transmit tone signal passing through a non-ideal receive down-conversion mixer (the mixer in the receiver chain) is:

[0084]

[0085]

[0086]

[0087] After passing through an ideal analog receive filter with delay (the filter of the receiver chain):

[0088]

[0089] Obviously, the mismatch between the transmitter link and the receiver link is mixed together and cannot be separated.

[0090] In order to solve the above problem that the mismatch amount cannot be separated, the following will explain the corresponding modem mismatch calibration device with reference to the accompanying drawings and embodiments.

[0091] Figure 2 FIG. 1 shows a schematic diagram of a modem mismatch calibration apparatus according to an embodiment of the present disclosure. Figure 1The difference between the embodiments is that an adjustment module is provided between the output end of the power amplifier of the transmitter link and the input end of the receiver baseband link. The adjustment module is used to perform RF attenuation, positive sideband multiphase filtering, and mixing on the signal from the power amplifier in sequence for input into the receiver baseband link. It should be noted that the positive sideband polyphase filter (PSPF) immediately following the RF attenuator is divided into two paths. When both paths are closed, it is the first state of the adjustment module. When the upper path of the positive sideband polyphase filter shown in the figure is disconnected and the lower path is closed, it is the second state of the adjustment module. In addition, in the illustrated embodiment, the drop transmitter baseband part can be set as a transmitting module end, which includes a transmitting digital baseband signal processing module, a digital-to-analog conversion module, and a transmitting-end filtering module. Accordingly, the drop transmitter link can also be set to transmit the signal from the transmitting digital baseband signal processing module and sequentially pass through the digital-to-analog conversion module, the transmitting-end filtering module, the transmitting mixing module, the combiner, the power amplifier, and the output end of the transmitter link; and the add receiver baseband part can be set as a receiving module end (it can also be set as a receiver baseband link), and the receiver baseband link (receiving module end) includes a receiving-end filtering module, an analog-to-digital conversion module, and a receiving digital baseband signal processing module. Regarding the adjustment module, as shown in the illustrated embodiment, the input end of the adjustment module is connected to the output end of the power amplifier of the transmitter link, and the output end of the adjustment module is connected to the input end of the receiver baseband link after mixing and combining. Obviously, the input end of the receiver baseband link includes the illustrated uplink input end (which can also be identified as the input end of the uplink receiving end filtering module of the receiver baseband link as the first receiving end) and the downlink input end (which can also be identified as the input end of the downlink receiving end filtering module of the receiver baseband link as the second receiving end). In the embodiment shown in the figure, the RF attenuation of the adjustment module is achieved by an RF attenuator; the positive sideband multi-phase filtering of the adjustment module is achieved by a positive sideband multi-phase filter, wherein the positive sideband multi-phase filter has two outputs. If the upper output of the positive sideband multi-phase filter is turned on, it is branched into a first mixer (local oscillation signal LO, the first mixer from the top to the bottom of the receiver chain in the figure) and a second mixer (local oscillation signal LO, the second mixer from the top to the bottom of the receiver chain in the figure); if the lower output of the positive sideband multi-phase filter is turned on, it is branched into a third mixer (local oscillation signal LO, the third mixer from the top to the bottom of the receiver chain in the figure) and a fourth mixer (local oscillation signal LO, the fourth mixer from the top to the bottom of the receiver chain in the figure), and the outputs of the first mixer and the third mixer are combined, and the outputs of the second mixer and the fourth mixer are combined.

[0092] 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.

[0093] Then, in the above calibration device, it includes a transmitter chain and a receiver chain, the transmitter chain includes a transmitter baseband chain, and the receiver chain includes a receiver baseband chain; an adjustment module is arranged between the output end of the power amplifier of the transmitter chain and the input end of the receiver baseband chain. The adjustment module includes a first state and a second state. The adjustment module in the first state is arranged to adjust the signal V from the power amplifier to TX.RF After RF attenuation and positive sideband multiphase filtering, the signal V TX.RF is decomposed into signal I TX.RF.poly and signal Q TX.RF.poly , and satisfies the complex signal relation S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly , so that the signal I TX.RF.poly and signal Q TX.RF.poly After being split and mixed, they are output as signals I RX.MIX and signal Q RX.MIX , so that the complex signal relationship S is satisfied RX.MIX =I RX.MIX +jQ RX.MIX , signal I RX.MIX and signal Q RX.MIX The adjustment module in the second state is configured to transmit the signal V' from the power amplifier after the transmitter calibration is completed. TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , signal I' RX.MIX and signal Q' RX.MIX is transmitted to the receiver baseband link.

[0094] Figure 3A schematic diagram of an adjustment module in a modem mismatch detection device according to some embodiments of the present disclosure is shown in a first state. In this exemplary embodiment, the adjustment module is in the first state. That is, in order to first perform transmitter link calibration, the positive sideband polyphase filter immediately following the RF attenuator is split into two paths. When both paths are closed, the adjustment module enters the first state. At this time, the output signal I transmitted by the transmit digital baseband signal processing module of the modem is TX.BB and Q TX.BB Satisfies the complex signal relationship:

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

[0096] Signal I TX.BB and Q TX.BB After the digital-to-analog converter and the transmitter filter, the signal I is obtained. TX.FLT and Q TX.FLT , satisfying the complex signal relationship: S TX.FLT =I TX.FLT +jQ TX.FLT = ;Signal I TX.FLT and Q TX.FLT After passing through the mixer, combiner, and power amplifier, the output is signal V TX.RF Then, the adjustment module for the first state is configured to receive a signal V from the power amplifier. TX.RF ,

[0097] Among them, V TX.RF = = ,

[0098] Signal V TX.RF After RF attenuation (via RF attenuator) and positive sideband polyphase filtering (via positive sideband polyphase filter), the signal V TX.RF is decomposed into signal I TX.RF.poly and signal Q TX.RF.poly , and satisfies the complex signal relationship:

[0099] S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly ,in

[0100] I TX.RF.poly +jQ TX.RF.poly = ;

[0101] Signal I TX.RF.poly and signal Q TX.RF.polyAfter being divided and mixed (via a mixer), they are output as signal I RX.MIX and signal Q RX.MIX , so that the complex signal relationship is satisfied:

[0102] S RX.MIX =I RX.MIX +jQ RX.MIX = ;

[0103] Furthermore, the signal I RX.MIX and signal Q RX.MIX After filtering (via the receiving end filter) and analog-to-digital conversion (via the analog-to-digital converter), it is converted into a signal I RX.BB and Q RX.BB , and finally transmitted to the receiving digital baseband signal processing module, where the signal I RX.BB and Q RX.BB Satisfies the complex signal relationship:

[0104] S RX.BB =I RX.BB +jQ RX.BB = ;

[0105] Obviously, the above formula only contains the mismatch of the transmitter link.

[0106] Further, for Figure 3 In an exemplary embodiment, at the digital receiving end, the mismatch amount is detected by integration:

[0107] ;

[0108] ;

[0109] Dividing the two equations yields the test quantity: ,in The phase shift of the transmit / receive analog filter is a fixed value (does not change with time). Calibration in the digital domain at the transmitter can make the detection amount When the value is 0, the transmit image calibration is completed and the transmitted signal will be an ideal single-tone signal without an image. It seems to contain two variables and , in fact It can be calculated, and then in the transmission calibration circuit, just scan (iterate) the single-dimensional variable , then The real and imaginary parts of are respectively assigned to the corresponding parameters in the transmit calibration circuit, so that If the value is 0, the transmitter calibration is completed. Therefore, the transmitter chain of the modem is calibrated, and the receiver chain of the modem needs to be calibrated next.

[0110] Figure 4 A schematic diagram shows an adjustment module in a second state of a modem mismatch calibration device according to some embodiments of the present disclosure. In this exemplary embodiment, the adjustment module is in the second state, i.e., in order to calibrate the receiver link after the transmitter link is calibrated, the positive sideband polyphase filter immediately following the RF attenuator is disconnected on the upper path and closed on the lower path. At this time, the output signal transmitted by the transmit digital baseband signal processing module of the modem passes through a digital-to-analog converter, a transmitter filter, a mixer, a combiner, and a power amplifier, and is output as a signal V'. TX.RF , and then the signal V' TX.RF After performing RF attenuation (via RF attenuator), positive sideband polyphase filtering (via positive sideband polyphase filter), and then splitting into two mixing paths (via mixer), the signal I' is obtained. RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , signal I' RX.MIX and Q' RX.MIX In some embodiments, the adjustment module in the second state is configured to receive a signal V' from the power amplifier after the transmitter calibration is completed. TX.RF , which satisfies the relationship:

[0111] V' TX.RF = ,

[0112] Signal V' TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , where I' RX.MIX +jQ' RX.MIX ;

[0113] Furthermore, signal I' RX.MIX and Q' RX.MIX After filtering (via the receiving end filter) and analog-to-digital conversion (via the analog-to-digital converter), it is converted into a signal I' RX.BB and Q' RX.BB , and finally transmitted to the receiving digital baseband signal processing module, where the signal I'RX.BB and Q' RX.BB Satisfies the complex signal relationship:

[0114] I' RX.BB +jQ' RX.BB = ;

[0115] Obviously, the above formula only contains the mismatch of the receiver link.

[0116] Further, for Figure 4 In the embodiment, at the digital receiving end, the mismatch amount is detected by integration:

[0117] ;

[0118] ;

[0119] Dividing the two equations yields the test quantity: , performing calibration in the digital domain at the receiving end can eliminate these two mismatches.,Thus, the modem's receiver chain is calibrated, and then the entire modem's transmitter chain and receiver chain are calibrated.

[0120] It should be understood that the above Figure 2-4 In the example embodiment, a modem mismatch calibration apparatus is shown. This apparatus can detect and calibrate mismatches in the transmitter and receiver radio frequency links (primarily mismatches introduced by mixers). However, it does not consider mismatch detection and calibration in the baseband link (primarily mismatches introduced by filters). The following embodiments will introduce detection of baseband links.

[0121] Figure 5A schematic diagram illustrates a modem mismatch calibration apparatus according to other embodiments of the present disclosure. In this exemplary embodiment, a disconnect switch is provided between the transmitter filter and the transmitter mixer at the transmitter end to disconnect the signal from continuing to the backend (disconnecting the transmitter baseband portion from the RF portion). Correspondingly, a disconnect switch is also provided between the receiver filter and the receiver mixer at the receiver end to disconnect the receiver baseband portion from the RF portion. Furthermore, in the illustrated embodiment, the drop transmitter baseband portion can be configured as a transmitter module, which includes a transmit digital baseband signal processing module, a digital-to-analog conversion module, and a transmitter filter module; while the add receiver baseband portion can be configured as a receiver module, which includes a receiver filter module, an analog-to-digital conversion module, and a receive digital baseband signal processing module. Furthermore, in the illustrated embodiment, the output end of the upper transmitting end filter module in the transmitting module end is set as the first transmitting end, and the output end of the lower transmitting end filter module in the transmitting module end is set as the second transmitting end; correspondingly, the input end of the upper receiving end filter module in the receiving module end is set as the first receiving end, and the input end of the lower receiving end filter module in the receiving module end is set as the second receiving end; then, in the above-mentioned detection device, a switching module is included which is arranged between the transmitting module end and the receiving module end of the above-mentioned modem; and the switching module includes a first state and a second state. When the switching module is set to the first state, the signal from the above-mentioned first transmitting end can be transmitted to the above-mentioned first receiving end, and the signal from the above-mentioned second transmitting end can be transmitted to the above-mentioned second receiving end; when the switching module is set to the second state, the signal from the above-mentioned first transmitting end can be transmitted to the above-mentioned second receiving end, and the signal from the above-mentioned second transmitting end can be transmitted to the above-mentioned first receiving end. Correspondingly, the detection mismatch function of the detection device for matching modem mismatch, the transmission digital baseband signal processing module on the transmission module side may include corresponding first and second states; when the transmission digital baseband signal processing module is in the first state, the first digital transmitting end of the transmission digital baseband signal processing module (for example, the upper path of the two paths shown in the figure) sends an I signal, and the second digital transmitting end of the transmission digital baseband signal processing module (for example, the lower path of the two paths shown in the figure) sends a Q signal, wherein the complex signal relationship S=I+jQ is satisfied; when the transmission digital baseband signal processing module is in the second state, the first digital transmitting end of the transmission digital baseband signal processing module (for example, the upper path of the two paths shown in the figure) sends a Q signal, and the second digital transmitting end of the transmission digital baseband signal processing module (for example, the lower path of the two paths shown in the figure) sends an I signal, wherein the complex signal relationship S'=Q+jI=jS* is satisfied; further, when the transmission digital baseband signal processing module is set to the first state, the switching module is also set to its first state; and when the transmission digital baseband signal processing module is set to the second state, the switching module is also set to its second state.In other words, when the transmitting digital baseband signal processing module is set to the first state, the above-mentioned first digital transmitting end sends out the first digital signal I and the above-mentioned second digital transmitting end sends out the second digital signal Q. The switching module is then set to the first state, and the two signals sent by the transmitting digital baseband signal processing module must satisfy the complex signal relationship, for example, S1=I+jQ, and it is also necessary to satisfy that the phase of the second digital signal Q is 90 degrees ahead of the phase of the first digital signal I; when the transmitting digital baseband signal processing module is set to the second state, the first digital transmitting end sends out the second digital signal Q and the second digital transmitting end sends out the first digital signal I, so that the first digital signal I and the second digital signal Q satisfy the complex signal relationship S2=Q+jI, and the switching module is set to the second state.

[0122] Furthermore, in some embodiments, the first digital transmitter further includes a first digital transmitter P terminal and a first digital transmitter N terminal, wherein the first digital transmitter P terminal and the first digital transmitter N terminal can be used to output a pair of differential signals. For example, when the first digital transmitter sends the first digital signal I, the first digital transmitter P terminal outputs one of the differential signals I. + , and the first digital transmitter N terminal can output the differential signal I of another path - , then signal I + With signal I - The corresponding paired differential signals are formed, and the first digital transmitting end sends the first digital signal I. Accordingly, in some embodiments, the second digital transmitting end further includes a second digital transmitting P end and a second digital transmitting N end, and the second digital transmitting P end and the second digital transmitting N end can also be used to output paired differential signals (for example, signal Q + With signal Q - ).

[0123] Furthermore, in some embodiments, the first transmitting end may also include a first transmitting P-end and a first transmitting N-end, and the first transmitting P-end and the first transmitting N-end may be used to output paired differential signals; and the second transmitting end may also include a second transmitting P-end and a second transmitting N-end, and the second transmitting P-end and the second transmitting N-end may be used to output paired differential signals. Correspondingly, in some embodiments, the first receiving end may also include a first receiving P-end and a first receiving N-end, and the first receiving P-end and the first receiving N-end may be used to receive paired differential signals; and the second receiving end may also include a second receiving P-end and a second receiving N-end, and the second receiving P-end and the second receiving N-end may be used to receive paired differential signals.

[0124] Therefore, further, in some detailed embodiments, the switching module in the first state is configured to connect the first transmitting P end with the first receiving P end, connect the first transmitting N end with the first receiving N end, connect the second transmitting P end with the second receiving P end, and connect the second transmitting N end with the second receiving N end; in this way, the switching module in the first state is configured to transmit the signal from the first transmitting end to the first receiving end (without changing the signal phase), and transmit the signal from the second transmitting end to the second receiving end (without changing the signal phase).

[0125] Accordingly, in some refined embodiments, the switching module in the second state is configured to connect the second transmitting P end with the first receiving P end, connect the second transmitting N end with the first receiving N end, connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end; in this way, the switching module in the second state is configured to transmit the signal from the first transmitting end to the second receiving end (without changing the signal phase), and transmit the signal from the second transmitting end to the first receiving end (without changing the signal phase).

[0126] Furthermore, in some embodiments, the switching module may further include a third state, and the third state may include a third A state and a third B state; the switching module in the third A state is configured to connect the second transmitting P end with the first receiving P end, and connect the second transmitting N end with the first receiving N end (i.e., only the signal of the second transmitting end is sent to the first receiving end, and the differential phase of the path is not changed); connect the first transmitting P end with the second receiving N end, and connect the first transmitting N end with the second receiving P end (i.e., not only the signal of the first transmitting end is sent to the second receiving end, but also the differential phase of the path is inverted); so that the switching module in the third B state is configured to connect the second transmitting P end with the first receiving N end, and connect the second transmitting N end with the first receiving P end (i.e., not only the signal of the second transmitting end is sent to the first receiving end, but also the differential phase of the path is inverted); connect the first transmitting P end with the second receiving P end, and connect the first transmitting N end with the second receiving N end (i.e., only the signal of the first transmitting end is sent to the second receiving end, and the differential phase of the path is not changed).

[0127] Furthermore, in some embodiments, when the first digital transmitting end sends a second digital negative signal -Q (i.e., the differential of this path is inverted) and the second digital transmitting end sends a first digital signal I (i.e., the differential of this path is not inverted), so that the first digital signal I and the second digital negative signal -Q satisfy the complex signal relationship S3=-Q+jI, the switching module is set to the third state or the second state.

[0128] Furthermore, in some embodiments, when the first digital transmitting end sends the second digital signal Q (i.e., the differential of this path is not inverted) and the second digital transmitting end sends the first digital negative signal -I (i.e., the differential of this path is inverted), so that the first digital negative signal I and the second digital signal Q satisfy the complex signal relationship S4=Q-jI, the switching module is set to the third state or the second state.

[0129] In some embodiments, the switching module is in the first state, and the transmit digital baseband signal processing module is also in its first state. At this time, the output signal I transmitted by the transmit digital baseband signal processing module of the modem is TX.BB and Q TX.BB Satisfies the complex signal relationship:

[0130] S TX.BB =I TX.BB +jQ TX.BB = .

[0131] In some embodiments, the switching module is in the second state, and the transmit digital baseband signal processing module is also in its second state. At this time, the output signal I' transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q' TX.BB Satisfies the complex signal relationship:

[0132] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB = .

[0133] In some embodiments, a modem mismatch detection method 500 is provided, which includes the following steps: Step 510, determining an output signal (eg, a first signal) transmitted by a transmit digital baseband signal processing module of a modem. TX.BB and Q TX.BB , and satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ; Step 520, determine signal I TX.BB and Q TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal (for example, counted as the second signal) I TX.FLT and Q TX.FLT , signal I TX.FLT and Q TX.FLT Output from the output end of the transmitting module, and satisfy the complex signal relationship S TX.FLT=I TX.FLT +jQ TX.FLT Step 530, determine the modem receiving module input terminal from the output terminal of the transmitting module terminal signal (eg, counted as the third signal) I RX.FLT.in and Q RX.FLT.in , and satisfy the complex signal relationship S RX.FLT.in =I RX.FLT.in +jQ RX.FLT.in =S TX.FLT ; Step 540, determine signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, it is converted into a signal (for example, counted as the fourth signal) I RX.BB and Q RX.BB , and satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB , signal I RX.BB and Q RX.BB Finally transmitted to the receiving digital baseband signal processing module of the modem; Step 550, adjust and determine the output signal (eg, counted as the fifth signal) transmitted by the transmitting digital baseband signal processing module of the modem I' TX.BB and Q' TX.BB , and satisfy the complex signal relationship:

[0134] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB ;

[0135] Step 560, determine signal I' TX.BB and Q' TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal (for example, counted as the sixth signal) I' TX.FLT and Q' TX.FLT , and signal I' TX.FLT and Q' TX.FLT Output from the output end of the transmitting module, and satisfy the complex signal relationship S' TX.FLT =I' TX.FLT +jQ' TX.FLT Step 570, determine the modem receiving module input end of the output signal from the output end of the transmitting module end (eg, counted as the seventh signal) I ' RX.FLT.in and Q' RX.FLT.in , which satisfies the complex signal relation

[0136] S'RX.FLT.in =I' RX.FLT.in +jQ' RX.FLT.in =jS'* TX.FLT =Q' TX.FLT +jI' TX.FLT ;

[0137] Step 580, determine signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, it is converted into a signal (for example, counted as the eighth signal) I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , signal I' RX.BB and Q' RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the modem; Step 590, according to the signal I received by the receiving digital baseband signal processing module of the modem RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB To obtain the four mismatch parameters of baseband simulation mismatch.

[0138] In particular, for the above step 510, in some embodiments, the output signal I transmitted by the transmit digital baseband signal processing module of the above modem is TX.BB and Q TX.BB Satisfies the complex signal relationship:

[0139] S TX.BB =I TX.BB +jQ TX.BB = ;

[0140] In particular, for the above step 520, in some embodiments, the above signal I TX.BB and Q TX.BB The output signal I is converted after the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the above-mentioned modem. TX.FLT and Q TX.FLT Satisfies the complex signal relationship:

[0141] S TX.FLT =I TX.FLT +jQ TX.FLT = ;

[0142] In particular, for the above step 530, in some embodiments, the signal I from the output end of the above transmitting module end is inputted by the receiving module end of the above modem.RX.FLT.in and Q RX.FLT.in Satisfies the complex signal relationship:

[0143] S RX.FLT.in =I RX.FLT.in +jQ RX.FLT.in =S TX.FLT ;

[0144] In particular, for the above step 540, in some embodiments, the above signal I RX.FLT.in and Q RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, the converted signal I RX.BB and Q RX.BB Satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB And satisfy the relationship:

[0145] S RX.BB = .

[0146] In particular, for the above step 550, in some embodiments, the above adjustment and determination of the output signal I' transmitted by the transmit digital baseband signal processing module of the above modem TX.BB and Q' TX.BB Satisfies the complex signal relationship:

[0147] S' TX.BB =I' TX.BB +jQ' TX.BB =jS* TX.BB =Q TX.BB +jI TX.BB = ;

[0148] In particular, for the above step 560, in some embodiments, the above signal I' TX.BB and Q' TX.BB After the digital-to-analog conversion, filtering and gain adjustment inside the transmitter module of the modem, it is converted into an output signal I' TX.FLT and Q' TX.FLT Satisfies the complex signal relationship:

[0149] S' TX.FLT =I' TX.FLT +jQ' TX.FLT = ;

[0150] In particular, for the above step 570, in some embodiments, the output signal I′ from the output end of the above transmitting module end is inputted by the receiving module end of the above modem. RX.FLT.in and Q'RX.FLT.in Satisfies the complex signal relationship:

[0151] S' RX.FLT.in =I' RX.FLT.in +jQ' RX.FLT.in =jS'* TX.FLT =Q' TX.FLT +jI' TX.FLT

[0152] And meet the following requirements:

[0153] S' RX.FLT.in =jS'* TX.FLT = ;

[0154] In particular, for the above step 580, in some embodiments, the above signal I' RX.FLT.in and Q' RX.FLT.in After filtering, gain adjustment, and analog-to-digital conversion within the receiving module of the modem, the converted signal I' RX.BB and Q' RX.BB Satisfies the complex signal relationship:

[0155] S' RX.BB =I' RX.BB +jQ' RX.BB

[0156] And meet the following requirements:

[0157] S' RX.BB = .

[0158] In particular, for the above step 590, in some embodiments, the signal I converted after filtering and gain adjustment and analog-to-digital conversion in the receiving module is RX.BB and Q RX.BB and signal I' RX.BB and Q' RX.BB , and satisfies the complex signal relation 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 Performing FFT yields:

[0159] ,

[0160] For negative sideband frequency components ( ) is normalized, and the amplitude is divided by the positive sideband ( ) at the corresponding frequencies, and the phase at the corresponding frequencies of the positive sidebands, resulting in a series of complex values:

[0161] ;

[0162] Similarly, the mismatch factor is extracted using the FFT method, for example, for S' RX.BB Perform similar operations and we get: ;

[0163] According to the above relationship between Di and D'-i, the four mismatch parameters of baseband simulation mismatch are obtained, namely

[0164] ;

[0165] The four mismatch parameters for a single-tone transmission signal obtained above can be eliminated by constructing corresponding equalizers at the digital end of the modem. Furthermore, if the full frequency band is to be covered, different single-tone signals can be sent for detection and calibration to cover the entire frequency band. It should also be noted that the subscript i above represents an index in a series of BB tone combinations, meaning that the parameter with the subscript i represents the single-tone parameter at the i-th frequency point. Furthermore, each frequency point corresponds to four mismatch parameters. For N frequency points, there will be 4N mismatch parameters.

[0166] It should be understood that a modem mismatch calibration device has been provided; therefore, in some embodiments, a modem mismatch optimization device can be proposed based on the above-mentioned calibration device, which includes: the aforementioned modem mismatch calibration device; in addition, a first-level or multi-level equalizer is provided between the modem's transmitting digital baseband signal processing module and the digital-to-analog conversion module, and between the modem's receiving digital baseband signal processing module and the analog-to-digital conversion module.

[0167] Figure 6 According to some embodiments of the present disclosure, a modem mismatch calibration method 600 is provided, which includes: step 610, determining the output signal I transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q TX.BB (first signal), and satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ; Step 620, determine the above signal I TX.BB and Q TX.BB After the digital-to-analog conversion and filtering of the transmitter link of the above-mentioned modem, it is converted into a signal I TX.FLT and Q TX.FLT (second signal), and satisfies the complex signal relationship S TX.FLT =ITX.FLT +jQ TX.FLT ; Step 630, determine the above signal I TX.FLT and Q TX.FLT After the mixing, combining, and power amplification of the transmitter chain of the above-mentioned modem, it is converted into a signal V TX.RF (third signal); Step 640, determine the above signal V TX.RF After RF attenuation and positive sideband polyphase filtering, it is decomposed and converted into signal I TX.RF.poly and Q TX.RF.poly (the fourth signal), and satisfies the complex signal relationship: S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly ; Step 650, determine the above signal I TX.RF.poly and Q TX.RF.poly After being divided, mixed and combined, they are converted into signal I RX.MIX and Q RX.MIX (fifth signal), and satisfies the complex signal relationship S RX.MIX =I RX.MIX +jQ RX.MIX ; Step 660, determine the above signal I RX.MIX and Q RX.MIX After filtering and analog-to-digital conversion, it is converted into signal I RX.BB and Q RX.BB (sixth signal), and satisfies the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB ; The above signal I RX.BB and Q RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the above-mentioned modem; Step 670, according to the signal I received by the receiving digital baseband signal processing module of the above-mentioned modem RX.BB and Q RX.BB To obtain the transmitter link mismatch parameter, so as to eliminate the transmitter link mismatch parameter through digital domain adjustment of the transmitter link of the modem.

[0168] Further, for step 610, in some embodiments, the output signal I transmitted by the transmit digital baseband signal processing module of the modem is TX.BB and Q TX.BB Satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB = ;

[0169] Furthermore, for step 620, in some embodiments, the signal I TX.BB and Q TX.BBThe converted signal I after digital-to-analog conversion and filtering inside the transmitter module of the above-mentioned modem TX.FLT and Q TX.FLT Satisfies the complex signal relationship:

[0170] S TX.FLT =I TX.FLT +jQ TX.FLT = ,

[0171] where φ T Represents the phase shift after filtering;

[0172] Further, for step 630, in some embodiments, the converted signal V after mixing, combining, and power amplification of the transmitter link of the modem is TX.RF Satisfaction relationship:

[0173] V TX.RF =

[0174] = ,

[0175] Among them, K T is the gain after mixing, combining, and power amplification of the transmitter link through the above-mentioned modem;

[0176] Further, for step 640, in some embodiments, the signal I is decomposed and converted after RF attenuation and positive sideband polyphase filtering. TX.RF.poly and Q TX.RF.poly Satisfies the complex signal relationship:

[0177] I TX.RF.poly +jQ TX.RF.poly = ,

[0178] Among them, K A is the gain of RF attenuation;

[0179] Furthermore, for step 650, in some embodiments, the converted signal I after branching, mixing, and combining is RX.MIX and Q RX.MIX Satisfies the complex signal relationship:

[0180] S RX.MIX =I RX.MIX +jQ RX.MIX = ;

[0181] Further, for step 660, in some embodiments, the signal I converted after filtering and analog-to-digital conversion is RX.BB and Q RX.BB Satisfies the complex signal relationship:

[0182] S RX.BB =I RX.BB +jQ RX.BB = .

[0183] Furthermore, in some embodiments, after eliminating the transmitter link mismatch parameter by digital domain adjustment of the transmitter link of the modem, that is, after completing step 670, the calibration method further includes: step 680, determining that the output signal transmitted by the transmit digital baseband signal processing module of the modem is converted into a signal V' after undergoing digital-to-analog conversion and filtering in the transmitter link of the modem, and then undergoing mixing, combining, and power amplification in the transmitter link of the modem. TX.RF Step 690, determine the signal V ' TX.RF After RF attenuation, positive sideband polyphase filtering, and then branching and mixing, it is converted into signal I' RX.MIX and Q' RX.MIX , and satisfy the complex signal relationship: S' RX.MIX =I' RX.MIX +jQ' RX.MIX Step 692, determine the above signal I ' RX.MIX and Q' RX.MIX After filtering and analog-to-digital conversion, it is converted into signal I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , the above signal I' RX.BB and Q' RX.BB Finally transmitted to the receiving digital baseband signal processing module of the above-mentioned modem; Step 694, according to the signal I' received by the receiving digital baseband signal processing module of the above-mentioned modem RX.BB and Q' RX.BB The receiver link mismatch parameter is obtained, and the receiver link mismatch parameter is eliminated by adjusting the receiver link of the modem in the digital domain.

[0184] Furthermore, regarding step 680, in some embodiments, the output signal transmitted by the transmit digital baseband signal processing module of the modem undergoes digital-to-analog conversion and filtering in the transmitter link of the modem, and then undergoes mixing, combining, and power amplification in the transmitter link of the modem to obtain the converted signal V'. TX.RF Satisfaction relationship:

[0185] V' TX.RF = ;

[0186] Further, for step 690, in some embodiments, the signal I′ is converted after RF attenuation, positive sideband polyphase filtering, and then branching and mixing. RX.MIX and Q' RX.MIX Satisfies the complex signal relationship:

[0187] I' RX.MIX +jQ' RX.MIX ;

[0188] Furthermore, for step 692, in some embodiments, the signal I′ is converted after filtering and analog-to-digital conversion. RX.BB and Q' RX.BB Satisfies the complex signal relationship:

[0189] I' RX.BB +jQ' RX.BB .

[0190] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0191] The foregoing description is merely an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that the present disclosure is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A modem mismatch calibration device, characterized in that: include: a transmitter link and a receiver link, wherein the receiver link comprises a receiver baseband link; an adjustment module, arranged between an output end of a power amplifier of the transmitter link and an input end of the receiver baseband link, the adjustment module being configured to sequentially perform radio frequency attenuation, positive sideband polyphase filtering, and frequency mixing on a signal from the power amplifier so as to input the signal into the receiver baseband link; The adjustment module includes a first state and a second state, The adjustment module in the first state is configured to adjust the signal V TX.RF After performing 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 the signal Q TX.RF.poly After being split and mixed, they are output as signals I RX.MIX and signal Q RX.MIX , so that the complex signal relationship S is satisfied RX.MIX =I RX.MIX +jQ RX.MIX , the signal I RX.MIX and the signal Q RX.MIX is transmitted to the receiver baseband link; The adjustment module in the second state is configured to convert the signal V' from the power amplifier after the transmitter calibration is completed TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , the signal I' RX.MIX and the signal Q' RX.MIX is transmitted to the receiver baseband link.

2. The calibration device according to claim 1, characterized in that: The transmitter chain is configured to transmit the signal from the transmission digital baseband signal processing module, and sequentially pass through the digital-to-analog conversion module, the transmission end filtering module, the transmission mixing module, the combiner, the power amplifier, and the output end of the transmitter chain; The transmitting digital baseband signal processing module includes a first digital transmitting end and a second digital transmitting end.

3. The calibration device according to claim 2, characterized in that: The receiver baseband link is configured to receive the signal from the adjustment module at the input end of the receiver baseband link and sequentially pass the signal through the receiving end filtering module, the analog-to-digital conversion module, and the receiving digital baseband signal processing module; The receiving digital baseband signal processing module includes a first digital receiving end and a second digital receiving end.

4. The calibration device according to claim 1, characterized in that: The adjustment module in the first state is configured to receive the signal V from the power amplifier. TX.RF , Among them, V TX.RF = = , The signal V TX.RF After performing 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 relationship: S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly , Part I TX.RF.poly +jQ TX.RF.poly = ; The signal I TX.RF.poly and the signal Q TX.RF.poly After being split and mixed, they are output as signals I RX.MIX and signal Q RX.MIX , so that the complex signal relationship is satisfied: S RX.MIX =I RX.MIX +jQ RX.MIX = Among them, K T Expressed as the gain of the entire transmission chain, K A Expressed as the gain of RF attenuation, Expressed as the angular frequency of the RF local oscillator signal, It is expressed as the phase of the complex transmitted local oscillator signal, It is represented as the phase of the complex received local oscillator signal, Expressed as the baseband single-tone signal angular frequency, φ T It is expressed as the phase delay of the signal after digital-to-analog conversion, filtering and gain adjustment in the transmission chain. It is expressed as the amplitude mismatch of the transmitted RF local oscillator signal, It is expressed as the angle mismatch of the transmitted RF local oscillator signal.

5. The calibration device according to claim 1, characterized in that: The adjustment module in the second state is configured to receive a signal V' from the power amplifier after the transmitter calibration is completed. TX.RF , where V' TX.RF = , The signal V' TX.RF After performing RF attenuation and positive sideband multiphase filtering in sequence, the signal is divided into two channels and mixed to obtain the signal I' RX.MIX and signal Q' RX.MIX , so that the complex signal relationship S' is satisfied RX.MIX =I' RX.MIX +jQ' RX.MIX , where I' RX.MIX +jQ' RX.MIX Among them, K T Expressed as the gain of the entire transmission chain, K A Expressed as the gain of RF attenuation, Expressed as the angular frequency of the RF local oscillator signal, It is expressed as the phase of the complex transmitted local oscillator signal, It is represented as the phase of the complex received local oscillator signal, Expressed as the baseband single-tone signal angular frequency, φ T It is expressed as the phase delay of the signal after digital-to-analog conversion, filtering and gain adjustment in the transmission chain. It is expressed as the amplitude mismatch of the received RF local oscillator signal. It is expressed as the angle mismatch of the received RF local oscillator signal.

6. A modem mismatch optimization device, characterized in that: include: The modem mismatch calibration device according to any one of claims 1 to 5; One or more equalizers are provided between the transmitting digital baseband signal processing module and the digital-to-analog conversion module of the modem, and between the receiving digital baseband signal processing module and the analog-to-digital conversion module of the modem.

7. A method for calibrating modem mismatch using the calibration device according to any one of claims 1 to 5, characterized in that: include: Determine the output signal I transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q TX.BB , and satisfy the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB ; Determine the signal I TX.BB and Q TX.BB After the digital-to-analog conversion of the transmitter link of the modem and filtering, it is converted into a signal I TX.FLT and Q TX.FLT , and satisfy the complex signal relationship S TX.FLT =I TX.FLT +jQ TX.FLT ; Determine the signal I TX.FLT and Q TX.FLT After mixing, combining, and power amplification in the transmitter chain of the modem, it is converted into a signal V TX.RF ; Determine the signal V TX.RF After RF attenuation and positive sideband polyphase filtering, it is decomposed and converted into signal I TX.RF.poly and Q TX.RF.poly , and satisfy the complex signal relationship S TX.RF.poly =I TX.RF.poly +jQ TX.RF.poly ; Determine the signal I TX.RF.poly and Q TX.RF.poly After being divided, mixed and combined, they are converted into signal I RX.MIX and Q RX.MIX , and satisfy the complex signal relationship S RX.MIX =I RX.MIX +jQ RX.MIX ; Determine the signal I RX.MIX and Q RX.MIX After filtering and analog-to-digital conversion, it is converted into signal I RX.BB and Q RX.BB , and satisfy the complex signal relationship S RX.BB =I RX.BB +jQ RX.BB ; The signal I RX.BB and Q RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the modem; According to the signal I received by the receiving digital baseband signal processing module of the modem RX.BB and Q RX.BB The transmitter link mismatch parameter is obtained, and the transmitter link mismatch parameter is eliminated by adjusting the transmitter link of the modem in the digital domain.

8. The calibration method according to claim 7, characterized in that: The output signal I transmitted by the transmit digital baseband signal processing module of the modem TX.BB and Q TX.BB Satisfies the complex signal relationship S TX.BB =I TX.BB +jQ TX.BB = ; The signal I TX.BB and Q TX.BB The converted signal I after digital-to-analog conversion and filtering inside the transmitter module of the modem TX.FLT and Q TX.FLT Satisfies the complex signal relationship: S TX.FLT =I TX.FLT +jQ TX.FLT = , where φ T Represents the phase shift after filtering; The converted signal V after mixing, combining, and power amplification of the transmitter chain of the modem TX.RF Satisfaction relationship: V TX.RF = = ， After RF attenuation and positive sideband polyphase filtering, the decomposed and converted signal I TX.RF.poly and Q TX.RF.poly Satisfies the complex signal relationship: I TX.RF.poly +jQ TX.RF.poly = , The converted signal I after splitting, mixing and combining RX.MIX and Q RX.MIX Satisfies the complex signal relationship: S RX.MIX =I RX.MIX +jQ RX.MIX = ; The converted signal I after filtering and analog-to-digital conversion RX.BB and Q RX.BB Satisfies the complex signal relationship: S RX.BB =I RX.BB +jQ RX.BB = Among them, K T Expressed as the gain of the entire transmission chain, K A Expressed as the gain of RF attenuation, K R It is expressed as the gain of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain. Expressed as the angular frequency of the RF local oscillator signal, It is expressed as the phase of the complex transmitted local oscillator signal, It is represented as the phase of the complex received local oscillator signal, Expressed as the baseband single-tone signal angular frequency, φ T It is expressed as the phase delay of the signal after the digital-to-analog conversion, filtering and gain adjustment of the transmission chain, φ R It is expressed as the phase delay of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain. It is expressed as the amplitude mismatch of the transmitted RF local oscillator signal, It is expressed as the angle mismatch of the transmitted RF local oscillator signal.

9. The calibration method according to claim 7, wherein: After eliminating the transmitter link mismatch parameter by digital domain adjustment of the transmitter link of the modem, the calibration method further comprises the steps of: Determine the output signal transmitted by the digital baseband signal processing module of the modem, which is converted into a signal V' after digital-to-analog conversion and filtering by the transmitter link of the modem, and then after mixing, combining, and power amplification by the transmitter link of the modem TX.RF ; Determine the signal V' TX.RF After RF attenuation, positive sideband polyphase filtering, and then branching and mixing, it is converted into signal I' RX.MIX and Q' RX.MIX , and satisfy the complex signal relationship: S' RX.MIX =I' RX.MIX +jQ' RX.MIX ; Determine the signal I' RX.MIX and Q' RX.MIX After filtering and analog-to-digital conversion, it is converted into signal I' RX.BB and Q' RX.BB , and satisfy the complex signal relationship S' RX.BB =I' RX.BB +jQ' RX.BB , the signal I' RX.BB and Q' RX.BB Finally, the signal is transmitted to the receiving digital baseband signal processing module of the modem; According to the signal I' received by the receiving digital baseband signal processing module of the modem RX.BB and Q' RX.BB The receiver link mismatch parameter is obtained, and the receiver link mismatch parameter is eliminated by adjusting the digital domain of the receiver link of the modem.

10. The calibration method according to claim 9, characterized in that: The output signal transmitted by the digital baseband signal processing module of the modem is converted into a signal V' after being subjected to digital-to-analog conversion and filtering by the transmitter link of the modem, and then subjected to mixing, combining, and power amplification by the transmitter link of the modem. TX.RF Satisfaction relationship: V’ TX.RF = ； After RF attenuation, positive sideband multiphase filtering, and then branching and mixing, the converted signal I' RX.MIX and Q' RX.MIX Satisfies the complex signal relationship: I' RX.MIX +jQ' RX.MIX ; After filtering and analog-to-digital conversion, the converted signal I' RX.BB and Q' RX.BB Satisfies the complex signal relationship: I' RX.BB +jQ' RX.BB ; Among them, K T Expressed as the gain of the entire transmission chain, K A Expressed as the gain of RF attenuation, K R It is expressed as the gain of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain. Expressed as the angular frequency of the RF local oscillator signal, It is expressed as the phase of the complex transmitted local oscillator signal, It is represented as the phase of the complex received local oscillator signal, Expressed as the baseband single-tone signal angular frequency, φ T It is expressed as the phase delay of the signal after the digital-to-analog conversion, filtering and gain adjustment of the transmission chain, φ R It is expressed as the phase delay of the signal after filtering, gain adjustment and analog-to-digital conversion in the receiving chain. It is expressed as the amplitude mismatch of the transmitted RF local oscillator signal, It is expressed as the angle mismatch of the transmitted RF local oscillator signal, It is expressed as the amplitude mismatch of the received RF local oscillator signal. It is expressed as the angle mismatch of the received RF local oscillator signal.

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