Electronic device and method for acquiring reverse signal and feedback signal in wireless communication system

Abstract

An electronic device is provided. The electronic device may include a digital pre-distortion (DPD), a digital-to-analog converter (DAC). The electronic device may include a power amplifier (PA). The electronic device may include: a first coupler to obtain a feedback signal from an output of a power amplifier; the circulator is used for acquiring a reverse signal output by the reflection power amplifier; a second coupler for obtaining a filter feedback signal from an output of the transmit filter; an antenna; an analog-to-digital converter (ADC) for converting a composite signal comprising the feedback signal, the filter feedback signal, and the reverse signal into a digital composite signal; a separation circuit; and a pulse intermodulation cancellation (PIMC) circuit, wherein the separation circuit can obtain a digital signal of the feedback signal, a digital signal of the filter feedback signal, and a digital signal of the reverse signal based on the digital synthesis signal and the DPD input signal.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly to a circuit for obtaining a reverse signal and a feedback signal in a wireless communication system, and an electronic device including the circuit. Background Art

[0002] For efficient signal transmission in wireless communication systems, return loss can be measured. In addition, the feedback signal can be used to remove passive intermodulation (PIM) generated during the process of processing radio frequency (RF) signals through nonlinear elements.

[0003] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art with respect to the present disclosure. Summary of the invention

[0004] Technical Solutions

[0005] In an embodiment of the present disclosure, an electronic device is provided. The electronic device includes a digital predistortion (DPD) and a digital-to-analog converter (DAC). The electronic device includes a power amplifier (PA). The electronic device includes a first coupler for obtaining a feedback signal from the output of the power amplifier. The electronic device includes a circulator for obtaining a reverse signal, wherein the output of the power amplifier is reflected. The electronic device includes a transmit filter. The electronic device includes a second coupler for obtaining a filter feedback signal from the output of the transmit filter. The electronic device includes an antenna. The electronic device includes an analog-to-digital converter (ADC) for converting a composite signal including a feedback signal, a filter feedback signal, and a reverse signal into a digital composite signal. The electronic device includes a separation circuit. The electronic device includes a pulse intermodulation cancellation (PIMC) circuit. The separation circuit can be configured to obtain a digital signal of a feedback signal, a digital signal of a filter feedback signal, and a digital signal of a reverse signal based on the digital composite signal and an input signal of the DPD.

[0006] In an embodiment of the present disclosure, a method performed by an electronic device is provided. The method includes obtaining a feedback signal from the output of a power amplifier (PA). The method includes obtaining a reverse signal, wherein the output of the power amplifier is reflected. The method includes obtaining a filter feedback signal from the output of a transmit filter. The method includes converting a composite signal including a feedback signal, a filter feedback signal, and a reverse signal into a digital composite signal by an analog-to-digital converter (ADC). The method includes obtaining a digital signal of the feedback signal, a digital signal of the filter feedback signal, and a digital signal of the reverse signal based on the digital composite signal and a digital predistortion (DPD) input signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0008] Figure 1 A wireless communication system according to an embodiment of the present disclosure is shown;

[0009] Figure 2 shows a functional configuration of a communication circuit according to an embodiment of the present disclosure;

[0010] Figure 3 shows a functional configuration of a synthesis circuit according to an embodiment of the present disclosure;

[0011] Figure 4 shows a functional configuration of a separation circuit according to an embodiment of the present disclosure;

[0012] Figure 5 shows a functional configuration of a passive intermodulation cancellation (PIMC) circuit according to an embodiment of the present invention;

[0013] Figure 6 An example of a communication circuit including a combining circuit and a separating circuit according to an embodiment of the present disclosure is shown;

[0014] Fig. 7A An example of obtaining a reverse signal using a communication circuit according to an embodiment of the present disclosure is shown;

[0015] Figure 7B An example of obtaining a feedback signal using a communication circuit according to an embodiment of the present disclosure is shown;

[0016] Figure 7C An example of obtaining a filter feedback signal using a communication circuit according to an embodiment of the present disclosure is shown; and

[0017] Figure 8 The performance of a communication circuit including a combining circuit and a separating circuit according to an embodiment of the present disclosure is shown.

[0018] The same reference numerals are used throughout the drawings to denote the same elements. DETAILED DESCRIPTION

[0019] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0020] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0021] Singular expressions may include plural expressions unless clearly indicated differently in the context. The terms used herein (including technical or scientific terms) may have the same meaning as that generally understood by persons with ordinary knowledge in the technical field described in the present disclosure. The terms defined in the general dictionary in the terms used in the present disclosure may be interpreted with the same or similar meaning as the contextual meaning of the relevant technology, and unless clearly defined in the present disclosure, are not interpreted with an ideal or overly formal meaning. In some cases, even the terms defined in the present disclosure may not be interpreted as excluding embodiments of the present disclosure.

[0022] In various embodiments of the present disclosure described below, a hardware method is described as an example. However, since various embodiments of the present disclosure include techniques using both hardware and software, various embodiments of the present disclosure do not exclude a software-based method.

[0023] For the convenience of description, terms referring to signals (e.g., signal, signal flow, compound signal, synthesis signal, composite signal, digital signal, analog signal, modulated signal, distorted signal), terms referring to resources (e.g., time, symbol, time slot, subframe, radio frame, subcarrier, resource element (RE), resource block (RB), bandwidth part (BWP), opportunity), terms for operating states (e.g., steps, operations, processes), terms referring to channels, terms referring to network entities, terms referring to components of devices, etc. are shown in the following description. Therefore, the present disclosure is not limited to the terms described below, and another term having an equivalent technical meaning may be used.

[0024] For the convenience of description, the terms used in the following description to refer to components of electronic devices (e.g., modules, antennas, antenna elements, circuits, processors, chips, components, devices), terms to refer to circuits (e.g., combination circuits, coupling circuits, separation circuits, power distribution circuits, PIMC circuits, harmonic removal circuits), terms to refer to the shapes of components (e.g., structures, constructions, support portions, contact portions, protruding portions), terms to refer to circuits (e.g., PCBs, FPCBs, signal lines, feed lines, data lines, RF signal lines, antenna lines, RF paths, RF modules, RF circuits, separators, distributors, couplers, combiners), etc. are shown. Therefore, the present disclosure is not limited to the terms described below, and another term with an equivalent technical meaning may be used. In addition, terms such as "…components", "…devices", "…structures", "…body", etc. used below may represent at least one shape structure, or may represent a unit of a processing function.

[0025] In addition, in the present disclosure, in order to determine whether a specific condition is satisfied or achieved, an expression of greater than or less than may be used, but this is only a description for expressing an example, and does not exclude a description of greater than or equal to or less than or equal to. A condition described as "greater than or equal to" may be replaced by "greater than", a condition described as "less than or equal to" may be replaced by "less than", and a condition described as "greater than or equal to and less than" may be replaced by "greater than and less than or equal to". In addition, hereinafter, "A" to "B" represent at least one of the elements from A (including A) to B (including B).

[0026] Hereinafter, the present disclosure relates to an electronic device and method for measuring return loss in real time and improving passive intermodulation cancellation (PIMC) performance in a wireless communication system. Specifically, the present disclosure explains the design principle of a communication circuit for measuring return loss in real time and performing PIMC with high accuracy using an analog-to-digital converter (ADC) in a wireless communication system.

[0027] The present disclosure provides a method, a circuit and an electronic device including the circuit for obtaining a reverse signal for measuring return loss and a feedback signal for passive intermodulation cancellation (PIMC) through a small number of analog-to-digital converters (ADCs).

[0028] The present invention provides a method, a circuit and an electronic device including the circuit for improving PIMC performance and measuring return loss in real time.

[0029] The electronic device and method according to the embodiment of the present invention improve the PIMC performance and realize the measurement of the return loss in real time by using the synthesis circuit and the separation circuit.

[0030] Effects that can be obtained from the present disclosure are not limited to the above-mentioned effects, and any other effects not mentioned herein will be clearly understood by a person of ordinary skill in the art to which the present disclosure pertains from the following description.

[0031] Figure 1 A wireless communication system according to an embodiment of the present disclosure is shown. Figure 1 The wireless communication environment 100 shows a base station 110 and a terminal 120 as part of a node using a wireless channel.

[0032] refer to Figure 1 , the base station 110 is a network infrastructure that provides wireless access to the terminal 120. The base station 110 has a coverage range that is defined as a specific geographical area based on the distance at which a signal can be sent. The base station 110 may be referred to as an "access point (AP)", "eNodeB (eNB)", "fifth generation node (5G node)", "5G NodeB (NB)", "radio point", "transmission / reception point (TRP)", "access unit", "distributed unit (DU)", "radio unit (RU)", "remote radio head (RRH)" or another term with equivalent technical meaning in addition to the base station. The base station 110 may send a downlink signal or may receive an uplink signal.

[0033] The terminal 120 is a device used by a user, and performs communication with the base station 110 through a wireless channel. In some cases, the terminal 120 can be operated without user participation. In other words, the terminal 120 is a device that performs machine type communication (MTC) and may not be carried by the user. The terminal 120 may be referred to as "user equipment (UE)", "mobile station", "subscriber station", "customer premises equipment (CPE)", "remote terminal", "wireless terminal", "electronic device", "terminal for vehicle", "user equipment" or another term having an equivalent technical meaning except for the terminal.

[0034] The embodiments of the present disclosure provide an electronic device and method for separating multiple signals by utilizing a minimum amount of resources in a wireless communication system. By separating multiple signals, the calculation accuracy of return loss can be improved, and the performance of passive intermodulation cancellation (PIMC) can be improved.

[0035] To calculate the return loss, the output signal of the power amplifier and the reflected signal are required. Passive intermodulation (PIM) caused by the output signal of the filter and nonlinearity of the passive components lead to performance degradation in the receive band.

[0036] In order to measure the return loss, a digital signal of the feedback signal of the output of the power amplifier and a digital signal of the reverse signal using the circulator are required. Here, an analog-to-digital converter (ADC) can be used to obtain the digital signal of the feedback signal. The ADC can be used to obtain the digital signal of the reverse signal. The feedback signal can also be used as an input signal of the PIMC. For the PIMC, the feedback signal can be continuously input to the PIMC through the ADC. However, when the ADC is set for each signal that needs to be obtained, a total of three ADCs are required, including an ADC for the feedback signal, an ADC for the reverse signal, and an ADC for the received signal. Therefore, the cost or size of the communication circuit may increase. In addition, the actual PIM is generated by the output signal and passive components of the filter, and if the feedback signal using the return loss is used as the source of PIM removal, the characteristics of the filter cannot be accurately reflected, which may lead to limitations in the performance of the PIMC.

[0037] A communication circuit including an ADC that selectively uses a feedback signal and a reverse signal can be proposed, but it is difficult to continuously input the feedback signal for PIM removal. For PIM removal, if a DPD input is used, it also leads to limitations in PIMC performance. In addition, since it is difficult to obtain the feedback signal and the reverse signal at the same time, data conversion processing is additionally required, and real-time calculation of return loss is not easy.

[0038] In order to solve the above problems, an embodiment of the present disclosure proposes a PIM removal method using a signal at an output terminal of a filter. In addition, according to an embodiment of the present disclosure, a signal processing method for providing a signal in an output terminal of a filter, a feedback signal, and a reverse signal in a digital part through an ADC and a communication circuit for implementing the signal processing method are proposed.

[0039] Figure 2 A functional configuration of a communication circuit according to an embodiment of the present disclosure is shown.

[0040] refer to Figure 2 , the communication circuit 200 may include a digital pre-distortion (DPD) 201. The DPD 201 may perform distortion of a digital signal in advance through digital signal processing in order to improve the nonlinearity of the RF component (e.g., power amplifier (PA) 205) of the signal. The signal input to the DPD 201 may be referred to as a DPD input signal S201. The DPD input signal S201 may be provided to a separation circuit 230 for distributing a composite signal to be described later. The output signal of the DPD 201 may be provided to a digital-to-analog converter (DAC) 203.

[0041] The communication circuit 200 may include a DAC 203. The DAC 203 may convert the output signal of the DPD 201 from the digital domain to the analog domain.

[0042] The communication circuit 200 may include a PA 205. The PA 205 may amplify an input signal. The PA 205 may amplify an analog signal that has passed through the DAC 203.

[0043] The communication circuit 200 may include a coupler 207. The coupler 207 may be a directional coupler. A directional coupler refers to a device inserted into a line between an RF source and a load. A directional coupler may provide RF power corresponding to a forward direction and power reflected from a load to a source. The coupler 207 may be located on a transmission path after an output terminal of the PA 205 and before the circulator 209. The coupler 207 may provide an output signal (i.e., an amplified signal) of the PA 205 to a synthesis circuit 220. The signal extracted by the coupler 207 may be referred to as a feedback signal S207.

[0044] The communication circuit 200 may include a circulator 209. The circulator 209 may reflect an input signal. In other words, the circulator 209 may output a reflected signal of the input signal. In other words, the circulator 209 may output a signal reflected from a filter end. The signal output from the circulator 209 may be referred to as a reverse signal S209. The reverse signal S209 may be provided to the synthesis circuit 220.

[0045] The communication circuit 200 may include a filter 260. The filter 260 is a component that provides filtering to send a signal of a desired frequency. The filter 260 may perform a function of selectively identifying a frequency by forming a resonance. The filter 260 may include at least one of a bandpass filter, a low-pass filter, a high-pass filter, or a band-stop filter. The filter 260 may include a TX (transmit) filter 261. The filter 260 may include an RX (receive) filter 263.

[0046] The communication circuit 200 may include a TX (transmit) filter 261. The TX (transmit) filter 261 may filter an input signal so that only a signal within a specific frequency range is transmitted to the antenna 270.

[0047] The communication circuit 200 may include an RX (receive) filter 263. The RX (receive) filter 263 may filter a signal received from the antenna 270 so that only a signal within a specific frequency range is processed.

[0048] The communication circuit 200 may include an antenna 270. The antenna 270 represents a radiator for transmitting a signal into the air.

[0049] The communication circuit 200 may include a coupler 267. The coupler 267 may be a directional coupler. The coupler 267 may be located between the output terminal of the TX (transmit) filter 261 and the antenna 270. The coupler 267 may provide the output signal of the TX (transmit) filter 261 to the synthesis circuit 220. The output signal of the TX (transmit) filter 261 extracted by the coupler 267 may be referred to as a filter feedback signal S267.

[0050] The communication circuit 200 may include a synthesizing circuit 220. The synthesizing circuit 220 may receive as input a feedback signal S207 derived from the coupler 207. The synthesizing circuit 220 may receive as input a reverse signal S209 derived from the circulator 209. The synthesizing circuit 220 may receive as input a filter feedback signal S267 derived from the coupler 267. The synthesizing circuit 220 may couple the feedback signal, the filter feedback signal, and the reverse signal. The synthesizing circuit 220 may obtain a composite signal S220 by coupling the feedback signal, the filter feedback signal, and the reverse signal. Figure 3 The components of the synthesis circuit 220 are described in detail.

[0051] The communication circuit 200 may include an ADC 223. The ADC 223 according to an embodiment of the present disclosure may convert a composite signal S220 including all of the feedback signal, the filter feedback signal, and the reverse signal from an analog domain to a digital domain. By using only one ADC 223 in addition to the ADC 283 for the receiving circuit to perform digital conversion on the feedback signal, the filter feedback signal, and the reverse signal, the design of the communication circuit 200 may be efficiently implemented. The ADC 223 may output a digital composite signal S223 by converting the input composite signal.

[0052] The communication circuit 200 may include a separation circuit 230. The separation circuit 230 may be referred to as a distribution circuit, a division circuit, an extraction circuit, or a name having the same technical meaning as these circuits. The separation circuit 230 may receive the DPD input signal S201 as an input. The separation circuit 230 may receive the digital composite signal S223 as an input. The separation circuit 230 may receive the digital composite signal S223 from the ADC 223. The separation circuit 230 may perform distribution based on the DPD input signal S201 and the digital composite signal S223.

[0053] The separation circuit 230 can obtain the reverse signal S233 from the composite signal. For example, based on Fig. 7A The separation circuit 230 can obtain the feedback signal S231 from the composite signal. For example, it can be based on Figure 7BThe separation circuit 230 can obtain the filter feedback signal S235 from the composite signal. For example, it can be based on Figure 7C The filter feedback signal is obtained by using the equation described in Figure 4 The components of the separation circuit 230 are described in detail.

[0054] The communication circuit 200 may include an ADC 283. The ADC 283 may convert a reception signal derived through the antenna 270 and the RX (receive) filter 263 from an analog domain to a digital domain. The ADC 283 may output a reception signal in a digital domain (hereinafter, a digital reception signal) S283. The digital reception signal S283 may be provided to the PIMC circuit 240.

[0055] The communication circuit 200 may include a passive intermodulation cancellation (PIMC) circuit 240. The PIMC circuit 240 may perform PIM removal based on the filter feedback signal S235 and the digital reception signal S283. The PIMC circuit 240 may output a signal S240 through PIM removal. Figure 5 The components of the PIMC circuit 240 are described in detail.

[0056] refer to Figure 2 , describes the various components used to process the signals sent through the amplifier.

[0057] In order to explain the configuration and operation principle of the synthesis circuit 220, the separation circuit 230 and the PIMC circuit 240, Figure 2 Components for a transmit path or components for a receive path are shown in FIG. For example, DPD 201, DAC 203, PA 205, and TX (transmit) filter 261 are shown to describe the transmit path. Therefore, the embodiments of the present disclosure are not limited to being interpreted as Figure 2 For example, it goes without saying that Figure 2 Additional components not shown in the figure (eg, phase shifters) may be provided in the communication circuit between the components of the transmission path. In addition, for example, at least some components of the transmission path may be provided in another location, omitted, or replaced.

[0058] Figure 3 FIG. 2 shows a functional configuration of a synthesis circuit according to an embodiment of the present disclosure. According to an embodiment, the synthesis circuit may be Figure 2 The synthesis circuit 220.

[0059] refer to Figure 3, the synthesis circuit 220 can obtain the feedback signal S207, the reverse signal S209 and the filter feedback signal S267 as input. The feedback signal S207 is an analog signal. The reverse signal S209 is an analog signal. The filter feedback signal S267 is an analog signal. The processing of the synthesis circuit 220 can be performed in the analog domain. According to an embodiment, the synthesis circuit 220 may include an attenuation circuit. The attenuation circuit can be used to reduce the amplitude of the reverse signal. The synthesis circuit 220 can obtain a composite signal by coupling the output of the attenuation circuit, the feedback signal S207 and the filter feedback signal S267. According to an embodiment, the synthesis circuit 220 may include an adder for coupling.

[0060] In order to convert the analog signal into a digital signal through an ADC, the synthesis circuit 220 can output the composite signal. The synthesis circuit 220 can output the composite signal to be input to the ADC. Figure 3 Not shown, but the composite signal can be converted into a digital composite signal by an ADC.

[0061] Figure 4 FIG. 2 shows a functional configuration of a separation circuit according to an embodiment of the present disclosure. According to an embodiment, the separation circuit may be Figure 2 The separation circuit 230 is provided.

[0062] refer to Figure 4 , the separation circuit 230 may obtain the DPD input signal S201 as input. The separation circuit 230 may obtain the digital composite signal S223 as input. The processing of the separation circuit 230 may be performed in the digital domain.

[0063] The separation circuit 230 can obtain a feedback signal S231 based on the DPD input signal S201 and the digital composite signal S223. The feedback signal S231 is a digital signal. The separation circuit 230 can obtain a reverse signal S233 based on the DPD input signal S201 and the digital composite signal S223. The reverse signal S233 is a digital signal. The separation circuit 230 can obtain a filter feedback signal S235 based on the DPD input signal S201 and the digital composite signal S223. The filter feedback signal S235 is a digital signal.

[0064] 1. Reverse signal extraction

[0065] The separation circuit 230 may generate an estimated feedback signal based on the DPD input signal S201. An amplitude compensation value and a delay compensation value may be obtained based on the amplitude and delay value of the feedback signal. The estimated feedback signal may be generated by applying the amplitude compensation value and the delay compensation value to the DPD input signal S201. According to an embodiment, the separation circuit 230 may include an operator for obtaining the amplitude compensation value and the delay compensation value. According to an embodiment, the separation circuit 230 may include a multiplier for applying the amplitude compensation value and the delay compensation value to the DPD input signal S201.

[0066] The separation circuit 230 can remove the estimated feedback signal from the digital composite signal S223. The separation circuit 230 can obtain the reference signal by removing the estimated feedback signal from the digital composite signal S223. The separation circuit 230 may include a subtractor for the removal operation. The separation circuit 230 may include a compensation circuit for compensating for the delay in the operator after the removal. The separation circuit 230 can obtain the reference signal by compensating the delay to the signal from which the estimated feedback signal is removed from the digital composite signal S223.

[0067] The separation circuit 230 may generate an estimated filter feedback signal based on the DPD input signal S201. An amplitude compensation value and a delay compensation value may be obtained based on the amplitude and delay value of the filter feedback signal. The estimated filter feedback signal may be generated by applying the amplitude compensation value and the delay compensation value to the DPD input signal S201. According to an embodiment, the separation circuit 230 may include an operator for obtaining the amplitude compensation value and the delay compensation value. According to an embodiment, the separation circuit 230 may include a multiplier for applying the amplitude compensation value and the delay compensation value to the DPD input signal S201.

[0068] The separation circuit 230 may remove the estimated filter feedback signal from the reference signal. The separation circuit 230 may obtain the reverse signal by removing the estimated filter feedback signal from the reference signal. The separation circuit 230 may include a subtractor for the removal operation.

[0069] 2. Feedback signal extraction

[0070] In the following, the components of the separation circuit 230 for extracting the feedback signal are described, but it goes without saying that the extraction of the feedback signal can be performed in conjunction with the components required to extract the reverse signal of Table 1. In addition, the extraction of the feedback signal can be performed in conjunction with the components required to extract the filter feedback signal of Table 3.

[0071] The separation circuit 230 may remove the reference signal from the digital composite signal. The separation circuit 230 may perform delay compensation on the digital composite signal. Here, delay compensation refers to an operation for compensating for the delay of a circuit for obtaining the reference signal. The separation circuit 230 may include a compensation circuit for delay compensation. The feedback signal may be obtained by removing the reference signal from the compensated digital composite signal. The separation circuit 230 may include a subtractor for the removal operation.

[0072] 3. Filter feedback signal extraction

[0073] The components of the separation circuit 230 for extracting the filter feedback signal are described, but the extraction of the filter feedback signal may be performed in conjunction with at least one of the components required to extract the reverse signal of the content table 1 or the components required to extract the feedback signal of the content table 2.

[0074] The separation circuit 230 may remove the reverse signal from the reference signal. The separation circuit 230 may perform delay compensation on the reference signal. Here, delay compensation refers to an operation for compensating for the delay of a circuit for obtaining the reverse signal. The separation circuit 230 may include a compensation circuit for delay compensation. The filter feedback signal may be obtained by removing the reverse signal from the compensated reference signal. The separation circuit 230 may include a subtractor for the removal operation.

[0075] Figure 5 FIG. 2 shows a functional configuration of a passive intermodulation cancellation (PIMC) circuit according to an embodiment of the present invention. According to an embodiment, the PIMC circuit may be Figure 2 The PIMC circuit 240.

[0076] refer to Figure 5 , the PIMC circuit 240 may obtain the filter feedback signal S235 as an input. The PIMC circuit 240 may obtain the digital receive signal S283 as an input. The processing of the separation circuit 230 may be performed in the digital domain.

[0077] The PIMC circuit 240 can obtain a signal S240 based on the filter feedback signal S235 and the digital received signal S283. The signal S240 is a digital signal. The PIMC circuit 240 can obtain the signal S240 by PIM removal. PIM represents unnecessary interference components generated by harmonics generated at a frequency that is a multiple of the frequency of the original signal. The PIMC circuit 240 can remove unnecessary interference components from the digital received signal obtained by the RX (receive) filter and the ADC.

[0078] Figure 6 An example of a communication circuit including a synthesis circuit and a separation circuit according to an embodiment of the present disclosure is shown. Figure 6 The communication circuit is shown in which there is provided a Figures 2 to 5 Describes the logic operation circuit and the RF component circuit. Figure 6 The structure of the communication circuit is an embodiment for describing the embodiments of the present disclosure and is not to be construed as limiting other embodiments.

[0079] Reference Figure 6 According to an embodiment, the communication circuit may include a coupler 207 for extracting a feedback signal S207 from the output of the PA 205. According to an embodiment, the communication circuit may include a coupler 267 for extracting a filter feedback signal S267 from the output of the filter 260. According to an embodiment, the communication circuit may include a circulator 209 for obtaining a signal reflected from the output signal of the PA 205, i.e., a reverse signal S209.

[0080] According to an embodiment, the synthesis circuit may include an attenuation circuit. The attenuation circuit 621 may obtain the reverse signal S209 as an input signal. The attenuation circuit 621 may be configured to attenuate the amplitude of the reverse signal S209. Figure 6 Different from the example shown, in some other embodiments, the attenuation circuit 621 may be omitted. According to an embodiment, the synthesis circuit may include an adder. The adder may output a composite signal, which is the sum of the feedback signal S207, the filter feedback signal S267 and the reverse signal S209 (or the output of the attenuation circuit 621).

[0081] According to the ADC 223 of the embodiment of the present disclosure, the composite signal S220 can be converted from the analog domain to the digital domain. The analog-to-digital conversion process of the communication circuit can be simplified by converting the composite signal S220 via the ADC 223 as a single component instead of converting the feedback signals (e.g., feedback signal S207, filter feedback signal S267, and reverse signal S209) separately. The simplified process enables the communication circuit to be designed efficiently. The ADC 223 can output a digital composite signal by conversion.

[0082] The separation circuit may include a compensation circuit, a subtractor circuit, and an operation circuit.

[0083] According to an embodiment, the separation circuit may include a first compensation circuit d1 for compensating for a relative delay between the feedback signal S207 and the DPD input signal S201 .

[0084] According to an embodiment, the separation circuit may include a first operation circuit for compensating the amplitude and phase α of the DPD input signal S201 so as to remove the component of the feedback signal S207. The first operation circuit may output an estimated feedback signal.

[0085] According to an embodiment, the separation circuit may include a subtractor circuit for removing the estimated feedback signal from the digital composite signal S223. The output of the subtractor may be referred to as a reference signal d ref (t).

[0086] According to an embodiment, the separation circuit may include a second compensation circuit for compensating for both the associated delay d2 between the filter feedback signal S267 and the DPD input signal and the delay of the subtractor circuit.

[0087] According to an embodiment, the separation circuit may include a second operation circuit for compensating the amplitude and phase β of the DPD input signal S201 so as to remove the component of the filter feedback signal S267. The second operation circuit may output an estimated filter feedback signal.

[0088] According to an embodiment, the separation circuit may include a third compensation circuit for compensating a delay d3 of the operation circuit to the reference signal.

[0089] According to an embodiment, the separation circuit may include a subtractor circuit for obtaining a reference signal compensated by the compensation circuit (hereinafter referred to as the compensated reference signal). ref1 (t) by removing the estimated filter feedback signal to extract the reverse signal S233 d rev (t).

[0090] According to an embodiment, the separation circuit may include: a fourth compensation circuit for compensating for obtaining the compensation reference signal d ref1 (t) delay d4.

[0091] According to an embodiment, the separation circuit may include a subtractor circuit for extracting the feedback signal S231 by removing the compensation reference signal, in other words, the compensation signal, from the digital composite signal that has passed through the fourth compensation circuit. fb1 (t).

[0092] According to an embodiment, the separation circuit may include a fifth compensation circuit for compensating for a delay d5 of the subtractor circuit for obtaining the inverse signal.

[0093] According to an embodiment, the separation circuit may include a subtractor circuit for extracting the filter feedback signal S235d by removing the reverse signal from the compensation reference signal (hereinafter, the compensation signal) that has passed through the fifth compensation circuit. fb2 (t).

[0094] The PIMC circuit may include a PIMC core 641 , a PIMC parameter extraction unit 643 , and a subtractor.

[0095] According to an embodiment, the PIMC parameter extraction unit 643 may receive a digital reception signal S283 as an input signal. When the signal received by the antenna passes through the RX (receive) filter 263 and the ADC 283, the digital reception signal S283 may be obtained. The PIMC parameter extraction unit 643 may obtain a filter feedback signal as an input signal. The PIMC parameter extraction unit 643 may output at least one parameter. The PIMC parameter extraction unit 643 may provide the at least one parameter to the PIMC core 641.

[0096] According to an embodiment, the PIMC core 641 may obtain a filter feedback signal as an input signal. The PIMC core 641 may obtain at least one parameter of the PIMC parameter extraction unit as an input signal. The PIMC core 641 may output an interference signal. The PIMC core 641 may provide the interference signal to a subtractor. The subtractor may remove the interference signal from the digital received signal S283. The subtractor may output a signal S240 by removing the interference signal from the digital received signal S283. The signal S240 may be a signal from which unnecessary interference components (in other words, PIM) have been removed.

[0097] In the following, through Figures 7A to 7C Describe the use Figure 6 Detailed operation of the separate circuits of the subtractor circuit, the operation circuit, and the compensation circuit are shown. Fig. 7A The operation of a separation circuit for extracting a reverse signal in a digital domain according to an embodiment of the present disclosure is described. Figure 7B The operation of a separation circuit for extracting a feedback signal in a digital domain according to an embodiment of the present disclosure is described. Figure 7C The operation of a separation circuit for extracting a filter feedback signal in a digital domain according to an embodiment of the present disclosure is described.

[0098] Fig. 7A An example of using a communication circuit to obtain a reverse signal according to an embodiment is shown. Fig. 7A In the description, even if a digital signal is converted into an analog signal or an analog signal is converted into a digital signal, since the properties of the signals are the same in the same ADC, signals with the same content can be represented by the same symbol.

[0099] refer to Fig. 7A , the input signal may pass through DPD 201, DAC 203 and PA 205. The input signal passed through may be referred to as an output signal. The output signal may be an analog signal. Coupler 207 may output a feedback signal based on the output signal. For example, the feedback signal may be represented by the following equation.

[0100] X fb1 (t) = α*X tx (t-Δt1 )…Equation 1

[0101] HereX fb1 (t) represents the feedback signal, X tx (t) represents the input signal, and α represents the feedback signal coefficient. Δt 1 Indicates the delay of the feedback signal.

[0102] The output signal of the PA 205 may be input to the filter 260. The coupler 267 may output a filter feedback signal based on an output signal of a TX (transmit) filter 261 of the filter 260. For example, the filter feedback signal may be represented by the following equation.

[0103] X fb2 (t) = β * X tx (t-Δt 2 )…Equation 2

[0104] HereX fb2 (t) represents the filter feedback signal, X tx (t) represents the input signal, and β represents the filter feedback signal coefficient. Δt 2 represents the delay of the filter feedback signal. The output signal of PA 205 may pass through circulator 209 and may be input to attenuation circuit 621. Attenuation circuit 621 may output an inverse signal. For example, the inverse signal may be represented by the following equation.

[0105] X rev (t) = γ*X fb1 (t-Δt 3 )…Equation 3

[0106] HereX rev (t) indicates the reverse signal, X fb1 (t) represents the feedback signal, and γ represents the reverse signal coefficient. Δt 3 Indicates the delay of the reverse signal.

[0107] The feedback signal, the filter feedback signal, and the reverse signal may be synthesized. The signal synthesizing the feedback signal, the filter feedback signal, and the reverse signal may be referred to as a composite signal. The composite signal may be referred to as an observation signal, an integral signal, a combined signal, or a name having the same technical meaning. The composite signal may be converted into a digital composite signal by ADC 223. For example, the digital composite signal may be represented by the following equation.

[0108] X obs (t) = X fb1 (t)+X fb2 (t)+X rev (t) = α*Xtx (t-Δt 1 )+β*X tx (t-Δt 2 )+γ*X fb1 (t-Δt 3 ) …Equation 4

[0109] HereX obs (t) represents a digital composite signal.

[0110] Referring to Equation 4, in the digital composite signal, the confirmation feedback signal and the filter feedback signal are correlated with the input signal. According to an embodiment, the communication circuit may estimate each signal using a delay compensation circuit at different correlations and a delay compensation circuit according to subtraction.

[0111] The input signal may be changed into an estimated feedback signal by an amplitude correction circuit and a phase correction circuit. The estimated feedback signal represents a signal that is corrected to be the same or similar to an actual feedback signal from the input signal. The estimated feedback signal may be a digital signal. The input signal may be changed into an estimated filter feedback signal by an amplitude correction circuit and a phase correction circuit. The estimated filter feedback signal represents a signal that is corrected to be the same or similar to an actual filter feedback signal from the input signal. The estimated filter feedback signal may be a digital signal.

[0112] The reverse signal may be obtained by removing the estimated feedback signal and the estimated filter feedback signal from the digital composite signal. For example, the reverse signal may be obtained by the following equation.

[0113] d ref (t) = X obs (t)-α*X tx (td 1 )…Equation 5

[0114] d ref (t) represents a first reference signal. The first reference signal represents a signal obtained by removing the estimated feedback signal from the digital composite signal. obs (t) represents a digital composite signal. tx (t) represents the input signal. α represents the feedback signal coefficient. d 1 Indicates the delay compensation of the feedback signal.

[0115] d ref1 (t) = d ref (td 3 )…Equation 6

[0116] d ref1 (t) represents a second reference signal. The second reference signal represents a signal in which the delay in the first reference signal is compensated. 3Denotes the delay compensation of the feedback signal. Referring to Equation 3, since the reverse signal includes an additional delay from the feedback signal, it is necessary to perform delay compensation on the first reference signal to obtain the reverse signal.

[0117] d rev (t) = d ref1 (t)-β*X tx (td 2 )…Equation 7

[0118] d rev (t) represents the reverse signal. β represents the filter feedback signal coefficient. d 2 Represents delay compensation of the filter feedback signal. The reverse signal can be obtained by removing the estimated filter feedback signal from the second reference signal. The obtained reverse signal can be a digital signal.

[0119] Figure 7B An example of using a communication circuit to obtain a feedback signal according to an embodiment is shown. Figure 7B In the description, even if a digital signal is converted into an analog signal or an analog signal is converted into a digital signal, since the properties of the signals are the same in the same ADC, they can be represented by the same symbol.

[0120] refer to Figure 7B , the first reference signal may include a component of the filter feedback signal and a component of the reverse signal in the composite signal. This is because the first reference signal is obtained by removing the estimated feedback signal from the composite signal. The communication circuit can obtain the feedback signal by inversely using the process of obtaining the first reference signal. For example, the feedback signal can be obtained by the following equation.

[0121] d fb1 (t) = X obs (td 4 )-d ref1 (t) … Equation 8

[0122] d fb1 (t) represents the feedback signal. obs (t) represents the composite signal. ref1 (t) represents the second reference signal. 4 represents the delay compensation for obtaining the second reference signal. For example, the delay compensation for obtaining the second reference signal may include at least one of the following: d in Equation 5 1 Or d in Equation 6 3 The feedback signal may be obtained by removing the second reference signal from the delay compensated composite signal. The obtained feedback signal may be a digital signal.

[0123] Figure 7CAn example of using a communication circuit to obtain a filter feedback signal according to an embodiment is shown. Figure 7C In the description, even if a digital signal is converted into an analog signal or an analog signal is converted into a digital signal, since the properties of the signals are the same in the same ADC, they can be represented by the same symbol.

[0124] refer to Figure 7C , the second reference signal may include a component of the filter feedback signal and a component of the reverse signal in the composite signal. This is because the second reference signal is obtained by removing the estimated feedback signal from the composite signal. The communication circuit can obtain the feedback signal by inversely using the process of obtaining the second reference signal. For example, the filter feedback signal can be obtained by the following equation.

[0125] d fb2 (t) = d ref1 (td 5 )-d rev (t) …Equation 9

[0126] d fb2 (t) represents the filter feedback signal. ref1 (t) represents the second reference signal. rev (t) represents the reverse signal obtained by Equation 7. 5 Denotes a delay compensation of a subtractor for the reverse signal. The filter feedback signal can be obtained by removing the second reference signal from the delay compensated composite signal. The obtained filter feedback signal can be a digital signal.

[0127] Can be based on Figures 7A to 7C The obtained reverse signal and feedback signal are used to calculate the return loss. For example, the return loss can be calculated based on the following equation.

[0128] Return Loss [dB]=10*log 10 (∑|d fb1 (t)| 2 -∑|d rev (t)| 2 )Equation 10

[0129] Return Loss means return loss. fb1 (t) represents the feedback signal. rev (t) indicates a reverse signal.

[0130] Through one ADC, the communication circuit can obtain the feedback signal, the filter feedback signal, and the reverse signal. When the filter feedback signal is supplied to the PIMC, accurate PIM removal can be achieved. In addition, since no switch is used, the filter feedback signal and the reverse signal are constantly input. Therefore, the electronic device is able to perform continuous RL calculations.

[0131] Figure 8 The performance of a communication circuit including a synthesis circuit and a separation circuit according to an embodiment of the present disclosure is shown. The performance of the communication circuit represents the performance of PIM removal.

[0132] refer to Figure 8 , a graph 801 shows the performance of PIM removal using a feedback signal that has not passed through a filter. A horizontal axis 810 of the graph 801 represents a frequency offset (unit: Hertz (Hz)). A vertical axis 820 of the graph 801 represents a power spectral density (PSD) (unit: decibel milliwatt (dBm)). A graph 802 shows the performance of PIM removal using a feedback signal that has passed through a filter (in other words, a filter feedback signal). A horizontal axis 810 of the graph 802 represents a frequency offset. A vertical axis 820 of the graph 802 represents a PSD (unit: dBm).

[0133] Referring to graphs 801 and 802, the reduced PSD after PIMC indicates that the PIM, in other words, the harmonic component, is removed from the corresponding frequency domain. In a specific frequency domain, the PSD in the case of using the signal passed through the filter is lower than the PSD in the case of using the feedback signal that does not pass through the filter. Since PIM removal is performed based on the filter feedback signal, the interference component may become closer to the noise level, and communication performance may be improved.

[0134] Embodiments of the present disclosure provide an electronic device and method for obtaining a feedback signal, a filter feedback signal and a reverse signal together. The electronic device may include a communication circuit including a synthesis circuit and a separation circuit for obtaining the feedback signal, the filter feedback signal and the reverse signal together.

[0135] According to an embodiment, the communication circuit may include a directional combiner for extracting the feedback signal.

[0136] According to an embodiment, the communication circuit may include a directional combiner for extracting the filter feedback signal.

[0137] According to an embodiment, the communication circuit may include a circulator for obtaining a reverse signal.

[0138] According to an embodiment, the communication circuit may include an attenuation circuit for reducing the amplitude of the reverse signal.

[0139] According to an embodiment, the communication circuit may include a combiner for synthesizing the feedback signal, the filter feedback signal, and the reverse signal.

[0140] According to an embodiment, the communication circuit may extract the reverse signal from the composite signal.

[0141] According to an embodiment, the communication circuit may include a first compensation circuit for compensating for a relative delay between a DPD input signal and a feedback signal.

[0142] According to an embodiment, the communication circuit may include a first operator for calculating the amplitude and phase of the DPD input signal and the feedback signal.

[0143] According to an embodiment, the communication circuit may include a first multiplier for multiplying the DPD input signal with a result of the first operator. The first multiplier may compensate the DPD input signal.

[0144] According to an embodiment, the communication circuit may include a first subtractor for removing the compensated DPD input signal from the composite signal.

[0145] According to an embodiment, the communication circuit may include a second compensation circuit for compensating for a related delay between the DPD input signal and the filter feedback signal and a delay of the first subtractor.

[0146] According to an embodiment, the communication circuit may include a second operator for calculating the amplitude and phase of the delayed DPD input and filter feedback signals.

[0147] According to an embodiment, the communication circuit may include a second multiplier for multiplying the delayed DPD input signal by a calculation result of the second operator.

[0148] According to an embodiment, the communication circuit may include a third compensation circuit for compensating for a delay of the second operator. The third compensation circuit may delay a result of the first subtractor by a delay of the second operator.

[0149] According to an embodiment, the communication circuit may include a second subtractor for removing the output of the second multiplier from the output of the third compensation circuit. The output of the second subtractor may correspond to the inverted signal.

[0150] According to an embodiment, the communication circuit may extract the feedback signal from the composite signal.

[0151] According to an embodiment, the communication circuit may include a fourth compensation circuit for extracting the feedback signal. The fourth compensation circuit may compensate for the delay of at least one of the correlation delay between the DPD input signal and the feedback signal, the delay of the second compensation circuit, and the delay of the subtractor. The composite signal may be input to the fourth compensation circuit. The fourth compensation circuit may compensate for the delay of the composite signal as much as the delay of the at least one signal.

[0152] According to an embodiment, a third subtractor for removing the output of the third compensation circuit from the output of the fourth compensation circuit may be included. The output of the third subtractor may correspond to the feedback signal.

[0153] According to an embodiment, the communication circuit may extract the filter feedback signal from the composite signal.

[0154] According to an embodiment, the communication circuit may include a fifth compensation circuit for extracting the filter feedback signal. The fifth compensation circuit may compensate for the delay of the second subtractor. The output signal of the third compensation circuit may be input to the fifth compensation circuit. The fifth compensation circuit may compensate for the output signal of the third compensation circuit as much as the delay of the second subtractor.

[0155] According to an embodiment, the communication circuit may include a fourth subtractor for removing the output of the second subtractor from the output of the fifth compensation circuit. The output of the fourth subtractor may correspond to the filter feedback signal.

[0156] According to an embodiment, the first coupler may include a directional coupler on a line between a radio frequency (RF) source and a load. The first coupler may also be configured to provide RF power corresponding to a forward direction and power reflected from the load to the RF source. The first coupler may be disposed on a transmission path before the circulator and after the output terminal of the PA.

[0157] According to an embodiment, the separation circuit may be further configured to perform an operation for compensating for a delay of a circuit for obtaining a reverse signal.

[0158] The embodiments of the present disclosure provide a structure for simplifying a communication circuit by changing all signals to the digital domain via a path passing through an ADC. Thus, the number of ADCs required can be reduced. The signals passing through the ADC can be separated into a feedback signal, a filter feedback signal, and a reverse signal in the digital domain.

[0159] The electronic device according to the embodiment can calculate the return loss (or VSWR) based on the digital signal of the feedback signal and the digital signal of the reverse signal. In the absence of a switch, since the digital signal of the feedback signal and the digital signal of the reverse signal are continuously provided in the time domain, the return loss can be calculated in real time.

[0160] The electronic device according to the embodiment can calculate the PIM component to be removed based on the digital signal of the filter feedback signal. The PIMC performance can be improved by removing the interference component of the transmitting end from the received signal using the signal after the filter end (in other words, the digital signal of the filter feedback signal).

[0161] In an embodiment of the present disclosure, an electronic device may include a digital predistortion (DPD) and a digital-to-analog converter (DAC). The electronic device may include a power amplifier (PA). The electronic device may include a first coupler for obtaining a feedback signal from the output of the power amplifier. The electronic device may include a circulator for obtaining a reverse signal, wherein the output of the power amplifier is reflected. The electronic device may include a transmit filter. The electronic device may include a second coupler for obtaining a filter feedback signal from the output of the transmit filter. The electronic device may include an antenna. The electronic device may include an analog-to-digital converter (ADC) for converting a composite signal including a feedback signal, a filter feedback signal, and a reverse signal into a digital composite signal. The electronic device may include a separation circuit. The electronic device may include a pulse intermodulation cancellation (PIMC) circuit. The separation circuit may be configured to obtain a digital signal of a feedback signal, a digital signal of a filter feedback signal, and a digital signal of a reverse signal based on the digital composite signal and the input signal of the DPD, respectively.

[0162] According to an embodiment, in order to obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal respectively, the separation circuit may be configured to generate an estimated feedback signal based on the input signal.

[0163] In order to obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal respectively, the separation circuit can be configured to generate an estimated filter feedback signal based on the input signal. In order to obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal respectively, the separation circuit can be configured to obtain the digital signal of the reverse signal by removing the estimated feedback signal and the estimated filter feedback signal from the digital composite signal.

[0164] According to an embodiment, an estimated feedback signal may be generated based on an input signal of the DPD, an amplitude of the feedback signal, and a delay of the feedback signal.An estimated filter feedback signal may be generated based on an input signal of the DPD, an amplitude of the filter feedback signal, and a delay of the filter feedback signal.

[0165] According to an embodiment, in order to obtain the digital signal of the reverse signal, the separation circuit can be configured to obtain the reference signal by removing the estimated feedback signal from the digital composite signal. In order to obtain the digital signal of the reverse signal, the separation circuit can be configured to obtain the digital signal of the reverse signal by removing the estimated filter feedback signal from the reference signal.

[0166] According to an embodiment, to obtain the reference signal, the separation circuit may be configured to subtract the estimated feedback signal from the digital composite signal.To obtain the reference signal, the separation circuit may be configured to obtain the reference signal by compensating the delay of the reverse signal to the result of the subtraction.

[0167] According to an embodiment, in order to respectively obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal, the separation circuit may be configured to obtain the digital signal of the feedback signal by removing the reference signal from the digital composite signal.

[0168] According to an embodiment, in order to obtain the digital signal of the feedback signal, the separation circuit can be configured to obtain the compensation signal by delay compensating the digital composite signal for the reference signal. In order to obtain the digital signal of the feedback signal, the separation circuit can be configured to obtain the digital signal of the feedback signal by removing the reference signal from the compensation signal.

[0169] According to an embodiment, in order to respectively obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal, the separation circuit can be configured to obtain the digital signal of the filter feedback signal by removing the digital signal of the reverse signal from the reference signal after obtaining the digital signal of the reverse signal.

[0170] According to an embodiment, the electronic device may further include a processor. The processor may be further configured to obtain a return loss based on the reverse signal and the feedback signal.

[0171] According to an embodiment, the electronic device may further include a receiving filter for obtaining a received signal through an antenna. The electronic device may further include a receiving ADC for converting the received signal into a digital received signal. The PIMC circuit may be configured to remove passive intermodulation (PIM) of the digital received signal based on the digital received signal and the filter feedback signal.

[0172] In an embodiment of the present disclosure, a method performed by an electronic device may include obtaining a feedback signal from an output of a power amplifier (PA). The method may include obtaining a reverse signal of the output of the reflected power amplifier. The method may include obtaining a filter feedback signal from the output of a transmit filter. The method may include converting a composite signal including a feedback signal, a filter feedback signal, and a reverse signal into a digital composite signal by an analog-to-digital converter (ADC). The method may include obtaining a digital signal of the feedback signal, a digital signal of the filter feedback signal, and a digital signal of the reverse signal based on the digital composite signal and a digital predistortion (DPD) input signal.

[0173] According to an embodiment, the operation of respectively obtaining the digital signal of the feedback signal, the digital signal of the filter feedback signal, and the digital signal of the reverse signal may include generating an estimated feedback signal based on the input signal. The operation of respectively obtaining the digital signal of the feedback signal, the digital signal of the filter feedback signal, and the digital signal of the reverse signal may include generating an estimated filter feedback signal based on the input signal. The operation of respectively obtaining the digital signal of the feedback signal, the digital signal of the filter feedback signal, and the digital signal of the reverse signal may include obtaining the digital signal of the reverse signal by removing the estimated feedback signal and the estimated filter feedback signal from the digital composite signal.

[0174] According to an embodiment, an estimated feedback signal may be generated based on an input signal of the DPD, an amplitude of the feedback signal, and a delay of the feedback signal.An estimated filter feedback signal may be generated based on an input signal of the DPD, an amplitude of the filter feedback signal, and a delay of the filter feedback signal.

[0175] According to an embodiment, the operation of obtaining the digital signal of the reverse signal may include obtaining the reference signal by removing the estimated feedback signal from the digital composite signal. The operation of obtaining the digital signal of the reverse signal may include obtaining the digital signal of the reverse signal by removing the estimated filter feedback signal from the reference signal.

[0176] According to an embodiment, the operation of obtaining the reference signal may include subtracting the estimated feedback signal from the digital composite signal. The operation of obtaining the reference signal may include obtaining the reference signal by compensating a delay of the reverse signal to a result of the subtraction.

[0177] According to an embodiment, the operation of respectively obtaining the digital signal of the feedback signal, the digital signal of the filter feedback signal, and the digital signal of the reverse signal may include obtaining the digital signal of the feedback signal by removing the reference signal from the digital composite signal.

[0178] According to an embodiment, obtaining the digital signal of the feedback signal may include obtaining the compensation signal by delay compensating the digital composite signal for the reference signal. Obtaining the digital signal of the feedback signal may include obtaining the digital signal of the feedback signal by removing the reference signal from the compensation signal.

[0179] According to an embodiment, the operation of respectively obtaining the digital signal of the feedback signal, the digital signal of the filter feedback signal, and the digital signal of the reverse signal may include obtaining the digital signal of the filter feedback signal by removing the digital signal of the reverse signal from the reference signal after obtaining the digital signal of the reverse signal.

[0180] According to an embodiment, the electronic device may further include obtaining a return loss based on the reverse signal and the feedback signal.

[0181] According to an embodiment, the method may further include obtaining a received signal through an antenna. The method may further include converting the received signal into a digital received signal through a receiving ADC. The method may further include removing passive intermodulation (PIM) of the digital received signal based on the digital received signal and the filter feedback signal.

[0182] According to an embodiment, the amplitude compensation value and the delay compensation value may be obtained based on the amplitude and delay value of the feedback signal. The estimated feedback signal may be generated by applying the amplitude compensation value and the delay compensation value to the input signal of the DPD.

[0183] The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0184] When implemented as software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors in an electronic device. One or more programs include instructions that cause the electronic device to perform the method according to the embodiments described in the claims or description of the present disclosure.

[0185] Such one or more programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, compact disk-ROM (CD-ROM), digital versatile disk (DVD) or other forms of optical storage, magnetic tape. Alternatively, it may be stored in a memory configured with some or all of its combinations. In addition, each configuration memory may include multiple.

[0186] In addition, the program can be stored in an attachable storage device, which can be accessed through a communication network, such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN) or a storage area network (SAN) or a combination thereof. Such a storage device can be connected to the equipment performing the embodiments of the present disclosure through an external port. In addition, a separate storage device on a communication network can access the equipment performing the embodiments of the present disclosure.

[0187] In the above specific embodiments of the present disclosure, the components included in the present disclosure are expressed in the singular or plural, depending on the specific embodiment presented. However, for ease of explanation, singular or plural expression is appropriately selected for the presented situation, and the present disclosure is not limited to singular or plural components, and even if a component is expressed in plural, it can also be configured as singular, or even if it is expressed in singular, it can also be configured as plural.

[0188] Meanwhile, in the detailed description of the present disclosure, specific embodiments have been described, but it goes without saying that various modifications may be made within the limits not departing from the scope of the present disclosure.

Claims

1. An electronic device, comprising: Digital pre-distortion (DPD); Digital-to-analog converter (DAC); Power amplifier (PA); a first coupler configured to obtain a feedback signal from an output of the power amplifier; a circulator configured to obtain a reverse signal reflecting the output of the power amplifier; Transmit filter; a second coupler configured to obtain a filter feedback signal from an output of the transmit filter; antenna; an analog-to-digital converter (ADC) configured to convert a composite signal including the feedback signal, the filter feedback signal, and the reverse signal into a digital composite signal; Separation circuit; as well as Pulse intermodulation cancellation (PIMC) circuit; The separation circuit is configured to obtain a digital signal of the feedback signal, a digital signal of the filter feedback signal and a digital signal of the reverse signal based on the digital composite signal and the input signal of the DPD.

2. The electronic device according to claim 1, wherein: In order to obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal, the separation circuit is configured as follows: generating an estimated feedback signal and an estimated filter feedback signal based on an input signal of the DPD; as well as A digital signal of the reverse signal is obtained by removing the estimated feedback signal and the estimated filter feedback signal from the digital composite signal.

3. The electronic device according to claim 2, in, The estimated feedback signal is generated based on an input signal of the DPD, an amplitude of the feedback signal, and a delay of the feedback signal, and The estimated filter feedback signal is generated based on an input signal of the DPD, an amplitude of the filter feedback signal, and a delay of the filter feedback signal.

4. The electronic device according to claim 2, wherein: In order to obtain a digital signal of the inverse signal, the separation circuit is configured as follows: obtaining a reference signal by removing the estimated feedback signal from the digital composite signal; and A digital signal of the reverse signal is obtained by removing the estimated filter feedback signal from the reference signal.

5. The electronic device according to claim 4, wherein: In order to obtain the reference signal, the separation circuit is configured as follows: subtracting the estimated feedback signal from the digital composite signal; and The reference signal is obtained by compensating the delay of the inverse signal to the result of the subtraction.

6. The electronic device according to claim 4, wherein: To obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal, the separation circuit is configured to obtain the digital signal of the feedback signal by removing the reference signal from the digital composite signal.

7. The electronic device according to claim 4, wherein: In order to obtain a digital signal of the feedback signal, the separation circuit is configured as follows: obtaining a compensated signal by compensating the digital composite signal with respect to the delay of the reference signal; and A digital signal of the feedback signal is obtained by removing the reference signal from the compensation signal.

8. The electronic device according to claim 4, wherein: In order to obtain the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal, the separation circuit is configured to obtain the digital signal of the filter feedback signal by removing the digital signal of the reverse signal from the reference signal after obtaining the digital signal of the reverse signal.

9. The electronic device according to claim 1, further comprising: processor, The processor is configured to obtain a return loss based on the reverse signal and the feedback signal.

10. The electronic device according to claim 1, further comprising: a receiving filter configured to obtain a receiving signal through the antenna; as well as a receiving ADC configured to convert the received signal into a digital received signal, The PIMC circuit is configured to remove passive intermodulation (PIM) of the digital reception signal based on the digital reception signal and the filter feedback signal.

11. The electronic device according to claim 1, in, The first coupler comprises a directional coupler on a line between a radio frequency (RF) source and a load, wherein the first coupler is further configured to provide RF power corresponding to a forward direction and power reflected from the load to the RF source, and The first coupler is arranged on a transmission path before the circulator and after the output terminal of the PA.

12. The electronic device according to claim 1, wherein: The separation circuit is further configured to perform an operation on the reference signal for compensating for a delay of a circuit for obtaining the reverse signal.

13. A method performed by an electronic device, the method comprising: obtaining a feedback signal from an output of a power amplifier (PA); obtaining a reverse signal reflecting the output of the power amplifier and obtaining a filter feedback signal from the output of the transmit filter; converting a composite signal including the feedback signal, the filter feedback signal, and the reverse signal into a digital composite signal by an analog-to-digital converter (ADC); and Based on the digital composite signal and an input signal of a digital predistortion (DPD), a digital signal of the feedback signal, a digital signal of the filter feedback signal, and a digital signal of the reverse signal are obtained.

14. The method according to claim 13, wherein: The operation of obtaining the digital signal of the feedback signal, the digital signal of the filter feedback signal and the digital signal of the reverse signal comprises: generating an estimated feedback signal and an estimated filter feedback signal based on an input signal of the DPD; and A digital signal of the reverse signal is obtained by removing the estimated feedback signal and the estimated filter feedback signal from the digital composite signal.

15. The method according to claim 14, in, The estimated feedback signal is generated based on an input signal of the DPD, an amplitude of the feedback signal, and a delay of the feedback signal, and Wherein, the estimated filter feedback signal is generated based on the input signal, the amplitude of the filter feedback signal and the delay of the filter feedback signal.

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