Method for reducing signal distortion and communication device thereof

Abstract

To provide a method and a communication device for reducing signal distortion due to signal compensation.SOLUTION: A method of reducing signal distortion performed by a communication device includes a signal analyzer, a compensation module in signal communication with the signal analyzer, an RF transceiver in signal communication with the compensation module, and an amplifier in signal communication with the RF transceiver. When the signal analyzer receives the transmission signal, the signal analyzer determines whether the compensation module compensates for the transmission data according to the transmission data, if it is determined that the transmission data is not compensated, the compensation module does not compensate for the transmission data, the RF transceiver converts the uncompensated transmission data into an uncompensated RF signal and transmits the uncompensated RF signal to the amplifier, and the amplifier amplifies the uncompensated RF signal.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for transmitting data, and more particularly to a method for reducing signal distortion by signal compensation and a communication device therefor. [Background technology]

[0002] The primary function of a power amplifier (PA) is to amplify and output a signal, allowing it to be transmitted over longer distances. However, power amplifiers only have a linear relationship between input and output power for low-power signals. When the signal power exceeds a certain power value (i.e., a high-power signal), the relationship between input and output power becomes nonlinear, resulting in distortion. This distortion can affect in-band performance. Therefore, a conventional method compensates for the distortion caused by the power amplifier's nonlinearity by adding distortion to the signal before it enters the power amplifier via digital predistortion (DPD).

[0003] However, because conventional DPD compensates in advance even for low-power signals, low-power signals that would not normally be distorted end up being distorted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Patent Application Publication No. 115037318 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method for reducing signal distortion and a communication device therefor, which can alleviate at least one of the drawbacks of the prior art. [Means for solving the problem]

[0006] According to one aspect of the present invention, a method for reducing signal distortion is performed by a communications device. The communications device includes a signal analyzer, a compensation module signally connected to the signal analyzer, an RF transceiver signally connected to the compensation module, and an amplifier signally connected to the RF transceiver. The method includes: (A) receiving a transmission signal, the signal analyzer analyzes the transmission signal to obtain time slot data indicating a time slot of the transmission signal and transmission data; (B) determining whether the compensation module compensates for the transmission data based on the time slot data; (C-1) converting the uncompensated transmission data into an uncompensated RF signal and transmitting it to an amplifier; and (C-2) amplifying the uncompensated RF signal when the amplifier receives the uncompensated RF signal.

[0007] According to another aspect of the present invention, a communications device includes a signal analyzer, a compensation module signally connected to the signal analyzer, an RF transceiver signally connected to the compensation module, and an amplifier signally connected to the RF transceiver. The signal analyzer is configured to, upon receiving a transmission signal, analyze the transmission signal to obtain time slot data indicating a time slot of the transmission signal and transmission data, and determine whether to compensate the transmission data based on the time slot data. When determining not to compensate the transmission data, the compensation module is configured not to compensate the transmission data. The RF transceiver is configured, upon receiving the uncompensated transmission data, to convert the uncompensated transmission data into an uncompensated RF signal and transmit it to the amplifier. The amplifier is configured, upon receiving the uncompensated RF signal, to amplify the uncompensated RF signal. [Effects of the Invention]

[0008] In the method for reducing signal distortion of the present invention, the signal analyzer determines whether to compensate the transmission data based on the time slot data, and if it determines not to compensate the transmission data, the compensation module does not compensate the transmission data, and the transmission data is sent to the RF transceiver and amplifier without compensation, thereby at least alleviating the problem in the prior art that pre-compensation may actually cause distortion.

[0009] Other features and advantages of the present invention will become apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying drawings. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram showing a communication device according to a first embodiment of the present invention. [Figure 2] 3 is a flowchart illustrating a method for reducing signal distortion according to a first embodiment of the present invention. [Figure 3] 3 is a flowchart illustrating a method for reducing signal distortion according to a first embodiment of the present invention. [Figure 4] FIG. 10 is a block diagram showing a communication device according to a second embodiment of the present invention. [Figure 5] 5 is a flowchart illustrating a method for reducing signal distortion according to a second embodiment of the present invention. [Figure 6] 5 is a flowchart illustrating a method for reducing signal distortion according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a diagram showing a data transmission process when the time slot is slot 0. [Figure 8] FIG. 10 is a diagram showing a data transmission process when the time slot is the first slot 1. [Figure 9] FIG. 10 is a diagram showing a data transmission process when the time slot is slot 1, which is not the first slot. DETAILED DESCRIPTION OF THE INVENTION

[0011] Before describing the present invention in more detail, it should be noted that, where considered appropriate, reference numerals or terminal portions of reference numerals have been repeated among the figures to indicate corresponding or similar elements that may have similar characteristics.

[0012] As used herein, the terms "couple" or "connect" mean a direct connection between two or more electrical devices / apparatus / facilities by means of a conductive material (e.g., electrical wires) or an indirect connection between two electrical devices / apparatus / facilities by means of one or more other devices / apparatus / facilities or wireless communication.

[0013] 1, a communication device according to a first embodiment of the present invention is shown. The communication device includes a signal generator 1, a signal analyzer 2 in signal communication with the signal generator 1, a compensation module 3 in signal communication with the signal analyzer 2, an RF (radio frequency) transceiver 4 in signal communication with the compensation module 3, an amplifier 5 in signal communication with the RF transceiver 4, and an RF coupler 6 in signal communication with the amplifier 5 and the RF transceiver 4.

[0014] The signal generator 1 generates a signal. In this embodiment, the signal generator 1 is, for example, an Intel® x86 processor using the Intel FlexRAN reference architecture.

[0015] The signal analyzer 2 analyzes the input signal.

[0016] The compensation module 3 includes a compensation calculation unit 31 that uses a compensation function to compensate the input signal, and a compensation function acquisition unit 32 that is connected to the compensation calculation unit 31 and acquires the compensation function. In this embodiment, the compensation module 3 operates by switching between a stop mode and an operation mode. The signal analyzer 2 and the compensation module 3 can be implemented together as a field programmable gate array (FPGA).

[0017] The RF transceiver 4 converts an input digital signal into an analog signal, or converts an input analog signal into a digital signal.

[0018] The amplifier 5 amplifies the input signal. In this embodiment, the amplifier 5 is a power amplifier.

[0019] The RF coupler 6 couples the input signal.

[0020] 2 and 3, a method for reducing signal distortion according to a first embodiment of the present invention is shown, which is performed by the communication device shown in Fig. 1. The method for reducing signal distortion in this embodiment includes steps 501 to 517.

[0021] In step 501 , the signal generator 1 generates a transmission signal and sends the transmission signal to the signal analyzer 2 .

[0022] In step 502, upon receiving the transmission signal, the signal analyzer 2 analyzes the transmission signal to obtain time slot data indicating the time slot of the transmission signal and transmission data, which is a digital signal.

[0023] In step 503, the signal analyzer 2 determines whether the compensation module 3 compensates the transmission data based on the time slot data. If it determines not to compensate the transmission data, the flow proceeds to step 504; otherwise, if it determines to compensate, the flow proceeds to step 511.

[0024] Specifically, the signal analyzer 2 determines whether to compensate the transmission data by determining whether the time slot indicated by the time slot data is used to output a low-power signal. If the time slot indicated by the time slot data is used to output a low-power signal, the signal analyzer 2 determines not to compensate the transmission data. On the other hand, if the time slot indicated by the time slot data is not used to output a low-power signal, the signal analyzer 2 determines to compensate the transmission data. For example, when the present invention is applied to 5G time division duplex (TDD) transmission, a TDD frame has 20 time slots (slot 0 to slot 19), and slot 0 transmits only a synchronization signal block (SSB) signal. Compared with a normal downlink (DL) signal, the power of the SSB signal is very small and belongs to a low-power signal. On the other hand, the signals transmitted in slots 1 to 19 are not low-power signals. When applied to 5G TDD transmission, the time slot data is, for example, a time slot identifier, and therefore, when the time slot indicated by the time slot identifier is slot 0, the signal analyzer 2 determines not to compensate for the transmission data, and when the time slot indicated by the time slot identifier is not slot 0, the signal analyzer 2 determines to compensate for the transmission data. Note that the present invention is not limited to TDD transmission.

[0025] If the signal analyzer 2 determines not to compensate the transmission data, in step 504, the signal analyzer 2 controls the compensation module 3 to operate in a stop mode and sends the transmission data to the compensation calculation unit 31 and the compensation function acquisition unit 32 of the compensation module 3.

[0026] In step 505, the compensation calculation unit 31 of the compensation module 3 operates in a stop mode, so that even if it receives transmission data, it does not compensate the transmission data and sends the uncompensated transmission data to the RF transceiver 4. In this embodiment, the transmission data is sent to the compensation module 3 and then sent to the RF transceiver 4, but it should be noted that the transmission data sent to the RF transceiver 4 is uncompensated.

[0027] In step 506, upon receiving the uncompensated transmission data, the RF transceiver 4 converts the uncompensated transmission data into an uncompensated RF signal and transmits the uncompensated RF signal to the amplifier 5. The RF signal is an analog signal.

[0028] In step 507 , upon receiving the uncompensated RF signal, the amplifier 5 amplifies the uncompensated RF signal and sends the amplified uncompensated RF signal to the RF coupler 6 .

[0029] In step 508, upon receiving the amplified uncompensated RF signal, the RF coupler 6 generates an uncompensated RF coupled signal based on the amplified uncompensated RF signal and transmits the uncompensated RF coupled signal to the RF transceiver 4. The RF coupled signal is an analog signal.

[0030] In step 509, upon receiving the uncompensated RF coupling signal, the RF transceiver 4 converts the uncompensated RF coupling signal into uncompensated RF coupling data, and sends the uncompensated RF coupling data to the compensation function acquisition unit 32 of the compensation module 3. The RF coupling data is a digital signal.

[0031] In step 510, the compensation function acquisition unit 32 of the compensation module 3 operates in a stop mode, so it does not update the compensation function even if it receives uncompensated RF coupling data. Specifically, normally, the compensation function acquisition unit 32 updates the compensation function based on the received RF coupling data and transmission data, but in this step of the present embodiment, the compensation function acquisition unit 32 operates in a stop mode, so it does not update the compensation function. It should be noted that although the compensation module 3 does not update the compensation function, the RF coupling data and transmission data are still sent to the compensation module 3.

[0032] In some embodiments, the signal analyzer 2 of the communication device may further be signal-connected to the amplifier 5. In such an embodiment, when it is determined that the transmission data should not be compensated, the signal analyzer 2 further controls the amplifier 5 so that the amplifier 5 does not transmit the amplified uncompensated RF signal to the RF coupler 6. As a result, the RF coupler 6 does not receive the amplified uncompensated RF signal and therefore does not generate an uncompensated RF coupling signal. The RF transceiver 4 does not receive the uncompensated RF coupling signal and therefore does not generate uncompensated RF coupling data. The compensation module 3 does not receive the uncompensated RF coupling data and therefore does not update the compensation function. Therefore, such an embodiment also achieves the effect of not updating the compensation function.

[0033] If the signal analyzer 2 determines that the transmission data should be compensated, in step 511, the signal analyzer 2 controls the compensation module 3 to operate in an operating mode and sends the transmission data to the compensation calculation unit 31 and the compensation function acquisition unit 32 of the compensation module 3.

[0034] In step 512, the compensation calculation unit 31 of the compensation module 3 operates in an operating mode, so that upon receiving transmission data, it compensates the transmission data using the compensation function and sends the compensated transmission data to the RF transceiver 4. Specifically, the compensation calculation unit 31 of the compensation module 3 compensates the transmission data by multiplying the received transmission data by the compensation function.

[0035] In step 513 , upon receiving the compensated transmission data, the RF transceiver 4 converts the compensated transmission data into a compensated RF signal and transmits the compensated RF signal to the amplifier 5 .

[0036] In step 514 , upon receiving the compensated RF signal, amplifier 5 amplifies the compensated RF signal and transmits the amplified compensated RF signal to RF coupler 6 .

[0037] In step 515, upon receiving the amplified compensated RF signal, the RF coupler 6 generates a compensated RF coupling signal based on the amplified compensated RF signal and transmits the compensated RF coupling signal to the RF transceiver 4.

[0038] In step 516, upon receiving the compensated RF coupling signal, the RF transceiver 4 converts the compensated RF coupling signal into compensated RF coupling data, and sends the compensated RF coupling data to the compensation function acquisition unit 32 of the compensation module 3.

[0039] In step 517, the compensation function acquisition unit 32 of the compensation module 3 operates in the operating mode, and updates the compensation function based on the compensated RF coupling data received from the RF transceiver 4 and the transmission data sent from the signal analyzer 2 in step 511. Specifically, the compensation function acquisition unit 32 calculates a transformation matrix for converting the transmission data into compensated RF coupling data based on the compensated RF coupling data and the transmission data, then calculates the inverse matrix of the transformation matrix and updates the compensation function using the inverse matrix. Here, since the compensated RF coupling data is generated based on the amplified compensated RF signal, it contains the nonlinearity of the amplifier 5, and the transformation matrix calculated based on the compensated RF coupling data and the transmission data can also indicate the nonlinearity of the amplifier 5. Therefore, the inverse matrix (updated compensation function) can compensate for the nonlinearity of the amplifier 5.

[0040] 4, a communication device according to a second embodiment of the present invention is shown. Compared with the communication device of the first embodiment, the communication device of the second embodiment further includes a switch 7 signally connected to the signal analyzer 2, the compensation module 3, and the RF transceiver 4, a first switch 8 signally connected to the signal analyzer 2 and to the compensation module 3, and a second switch 9 signally connected to the signal analyzer 2 and the RF transceiver 4 and to the compensation module 3.

[0041] 5 and 6, a method for reducing signal distortion according to a second embodiment of the present invention is shown, which is performed by the communication device shown in FIG. 4. The method for reducing signal distortion in this embodiment includes steps 601 to 615.

[0042] In step 601 , the signal generator 1 generates a transmission signal and sends the transmission signal to the signal analyzer 2 .

[0043] In step 602, upon receiving a transmission signal, the signal analyzer 2 analyzes the transmission signal to obtain time slot data indicating the time slot of the transmission signal and transmission data.

[0044] In step 603, the signal analyzer 2 determines whether the compensation module 3 should compensate the transmission data based on the time slot data. If it determines not to compensate the transmission data, the flow proceeds to step 604; otherwise, if it determines to compensate, the flow proceeds to step 609.

[0045] If the signal analyzer 2 determines not to compensate the transmission data, in step 604, the signal analyzer 2 controls the switch 7 to form a channel between the signal analyzer 2 and the RF transceiver 4, transmits the transmission data to the RF transceiver 4 through this channel, and further opens the first switch 8 and the second switch 9. By opening the first switch 8 and the second switch 9, the first switch 8 is not signal-connected to the compensation module 3, and the second switch 9 is not signal-connected to the compensation module 3. Note that in this embodiment, the transmission data is transmitted from the signal analyzer 2 to the RF transceiver 4, and therefore is not transmitted to the compensation module 3 and is not compensated. That is, the transmission data transmitted to the RF transceiver 4 is not compensated.

[0046] In step 605, upon receiving the uncompensated transmission data, the RF transceiver 4 converts the uncompensated transmission data into an uncompensated RF signal and transmits the uncompensated RF signal to the amplifier 5.

[0047] In step 606 , upon receiving the uncompensated RF signal, the amplifier 5 amplifies the uncompensated RF signal and transmits the amplified uncompensated RF signal to the RF coupler 6 .

[0048] In step 607, upon receiving the amplified uncompensated RF signal, the RF coupler 6 generates an uncompensated RF coupling signal based on the amplified uncompensated RF signal and transmits the uncompensated RF coupling signal to the RF transceiver 4.

[0049] In step 608, upon receiving the uncompensated RF coupling signal, the RF transceiver 4 converts the uncompensated RF coupling signal into uncompensated RF coupling data.

[0050] When the transmission data of this embodiment is not compensated, the first switch 8 and the second switch 9 are open, so the signal analyzer 2 cannot send the transmission data to the compensation function acquisition unit 32 of the compensation module 3 through the first switch 8, and the RF transceiver 4 cannot send the uncompensated RF coupling data to the compensation function acquisition unit 32 through the second switch 9. Therefore, the compensation function acquisition unit 32 cannot update the compensation function based on the RF coupling data and the transmission data, and therefore does not update the compensation function.

[0051] FIG. 7 shows the data transmission process when the time slot is slot 0, i.e., when the transmission data is not compensated. The transmission data for slot 0 (denoted as "IQ(slot 0)" in FIG. 7) is sent from the signal analyzer 2 to the RF transceiver 4 without passing through the compensation module 3, and then to the amplifier 5. Because the transmission data for slot 0 is a low-power signal, the amplifier 5 operates in its linear region, eliminating distortion at its output. The output of the amplifier 5 is a linearly amplified version of the transmission data. Therefore, in FIG. 7, IQ(slot 0) is used directly to represent the output of the amplifier 5. The RF coupler 6 couples the output of the amplifier 5 to generate an uncompensated RF coupling signal (denoted as "RF coupler feedback" in FIG. 7) and transmits it to the RF transceiver 4. The RF transceiver 4 converts the uncompensated RF coupling signal into uncompensated RF coupling data (denoted as "RF coupler IQ(slot 0)" in FIG. 7). Also, since the first switch 8 and the second switch 9 are open, the transmission data and the uncompensated RF coupling signal are not sent to the compensation module 3, and the compensation function acquisition unit 32 does not update the compensation function. Therefore, when slot 0 is the first slot, the compensation function is the default value H -1 If it is not the first slot 0, the compensation function H updated during the previous time slot (i.e., slot 19) is used. -1 (slot 19). Note that the default value of the compensation function, H -1 (default) will be explained later.

[0052] If the signal analyzer 2 determines that the transmission data should be compensated, in step 609, the signal analyzer 2 controls the switch 7 to form a channel between the signal analyzer 2 and the compensation module 3, sends the transmission data to the compensation calculation unit 31 of the compensation module 3 through this channel, and further closes the first switch 8 and the second switch 9 to send the transmission data to the compensation function acquisition unit 32 of the compensation module 3 through the first switch 8. By closing the first switch 8 and the second switch 9, the first switch 8 and the second switch 9 are signally connected to the compensation module 3.

[0053] In step 610 , upon receiving the transmission data, the compensation calculation unit 31 of the compensation module 3 compensates the transmission data using the compensation function, and sends the compensated transmission data to the RF transceiver 4 .

[0054] In step 611 , upon receiving the compensated transmission data, the RF transceiver 4 converts the compensated transmission data into a compensated RF signal and transmits the compensated RF signal to the amplifier 5 .

[0055] In step 612 , upon receiving the compensated RF signal, amplifier 5 amplifies the compensated RF signal and transmits the amplified compensated RF signal to RF coupler 6 .

[0056] In step 613, upon receiving the amplified compensated RF signal, the RF coupler 6 generates a compensated RF coupling signal based on the amplified compensated RF signal and transmits the compensated RF coupling signal to the RF transceiver 4.

[0057] In step 614, upon receiving the compensated RF coupling signal, the RF transceiver 4 converts the compensated RF coupling signal into compensated RF coupling data, and sends the compensated RF coupling data to the compensation function acquisition unit 32 of the compensation module 3 via the closed second switch 9.

[0058] In step 615, the compensation function acquisition unit 32 of the compensation module 3 updates the compensation function based on the compensated RF coupling data received from the RF transceiver 4 via the second switch 9 and the transmission data received from the signal analyzer 2 via the first switch 8.

[0059] In the second embodiment, whether to compensate for the transmission data is controlled by controlling whether to transmit the transmission data to the compensation module 3 via the switch 7. However, in some embodiments, the control of whether to transmit the transmission data to the compensation module 3 may be realized by software means instead of the switch 7. That is, the second embodiment is not limited to the switch 7. Similarly, in the second embodiment, whether to update the compensation function is controlled by controlling whether to transmit the transmission data and uncompensated / compensated RF coupling data to the compensation module 3 via the first switch 8 and the second switch 9. However, in some embodiments, the control of whether to transmit the transmission data and uncompensated / compensated RF coupling data to the compensation module 3 may be realized by software means instead of the first switch 8 and the second switch 9. That is, the second embodiment is not limited to the first switch 8 and the second switch 9.

[0060] FIG. 8 shows the data transmission process when the time slot is slot 1, i.e., when compensating for transmission data. Here, slot 1 is the first slot 1. In the prior art, when compensating for transmission data, the compensation function updated in the previous time slot is used. However, since the time slot before slot 1 is slot 0, amplifier 5 operates in the linear region, and the compensation function updated based on the transmission data and RF coupling data of slot 0 has the linearity of amplifier 5 and is not suitable for compensating for the transmission data of slot 1, which is not a low-power signal. On the other hand, in the present invention, when the time slot is slot 0, the compensation function is not updated, so the compensation for the transmission data of slot 1 is not affected by the data transmission of slot 0. Also, as mentioned above, since the compensation function is not updated in first slot 0, which is the time slot before the first slot 1, the compensation function used to compensate for the first slot 1 is the default value H -1 (default). More specifically, in order to compensate for the nonlinearity of the amplifier 5 in the first slot 1, in the present invention, for example, when the communication device of the present invention is powered on, the signal generator 1 generates a full-band initial transmission signal, the signal analyzer 2 analyzes the initial transmission signal to obtain initial transmission data, the RF transceiver 4 converts the initial transmission data into an initial RF signal, and the amplifier 5 amplifies the initial RF signal. Here, since the full-band initial transmission signal is not a low-power signal, the amplifier 5 operates in a nonlinear region. Next, the RF coupler 6 generates an initial RF coupling signal based on the amplified initial RF signal, and the RF transceiver 4 converts the initial RF coupling signal into initial RF coupling data. Finally, the compensation function acquisition unit 32 of the compensation module 3 acquires the default value H of the compensation function based on the initial RF coupling data and the initial transmission data. -1 The default value of the compensation function obtained based on the non-low power signal can better compensate for the nonlinearity of the amplifier 5 in the first slot 1.

[0061] In the data transmission process of the first slot 1, first, the transmission data of the first slot 1 (shown as "IQ (slot 1)" in FIG. 8) is sent to the compensation calculation unit 31 and the compensation function acquisition unit 32 of the compensation module 3 via the switch 7 and the first switch 8, respectively. The compensation calculation unit 31 obtains the default value H of the compensation function. -1 (default) and the compensated transmission data (in Figure 8, "IQ(slot 1)×H -1 The compensated transmission data is then sent to the RF transceiver 4 and then to the amplifier 5, and the output of the amplifier 5 (shown as "IQ(slot 1)×H" in FIG. 8) is -1 Here, the transmission data of slot 1 is a non-low power signal, and the amplifier 5 operates in the nonlinear region. However, since the transmission data has already been compensated before entering the amplifier 5, there is no distortion in the output of the amplifier 5, and there is a linear relationship between the transmission data and the output of the amplifier 5. In other words, the output of the amplifier 5 is a linear amplification of the transmission data. Therefore, for convenience, the output of the amplifier 5 is referred to as IQ(slot 1)×H -1 (default)×H(PA slot 1) is represented by IQ(slot 1). Then, the RF coupler 6 couples the output of the amplifier 5 to obtain a compensated RF coupling signal (indicated as "RF coupler feedback" in FIG. 8), and the RF transceiver 4 converts the compensated RF coupling signal into compensated RF coupling data (indicated as "RF coupler IQ(slot 1)" in FIG. 8) and transmits it to the compensation function acquisition unit 32 of the compensation module 3 via the second switch 9. The compensation function acquisition unit 32 calculates the inverse matrix H based on the transmission data received from the signal analyzer 2 via the first switch 8 and the compensated RF coupling data received from the RF transceiver 4 via the second switch 9. -1 Get (slot 1) and update the compensation function.

[0062] FIG. 9 shows the data transmission process when the time slot is not the first slot, slot 1. Similarly, the compensation function is not updated in slot 0, the time slot before slot 1. Therefore, the compensation function used for compensation of slot 1, which is not the first slot, is the compensation function H updated in slot 19, the time slot before slot 0. -1 (slot 19). Also, since the transmission data of slot 19 is not a low-power signal, the compensation function H -1 (slot 19) can better compensate for the nonlinearity of the amplifier 5 in slot 1. First, the transmission data of slot 1 is calculated by the compensation module 3 using the compensation function H -1 (slot 19) (in Figure 9, the compensated transmission data is "IQ(slot 1) × H -1 (slot 19)), which is sent to RF transceiver 4 and then to amplifier 5. The output of amplifier 5 is IQ(slot 1)×H -1 (slot 19)×H(PA slot 1), and as described above, the output of the amplifier 5 is a linearly amplified version of the transmission data. For convenience, the output of the amplifier 5 is IQ(slot 1)×H -1 (slot 19)×H(PA slot 1) is represented by IQ(slot 1). Then, the RF coupler 6 couples the output of the amplifier 5 to obtain a compensated RF coupling signal, and the RF transceiver 4 converts the compensated RF coupling signal into compensated RF coupling data, which is sent to the compensation function acquisition unit 32 of the compensation module 3 via the second switch 9. The compensation function acquisition unit 32 calculates the inverse matrix H based on the received transmission data and the compensated RF coupling data. -1 (slot 1) and update the compensation function.

[0063] In summary, in the method for reducing signal distortion of the present invention, the signal analyzer 2 determines whether to compensate the transmission data based on the time slot data. If it determines not to compensate the transmission data, the compensation module 3 does not compensate the transmission data, and the transmission data is sent to the RF transceiver 4 and the amplifier 5 without compensation. As a result, for example, if the time slot is used to output a low-power signal, the transmission data is not compensated and is linearly amplified, thereby avoiding undesired distortion caused by conventional DPD. Specifically, in the first embodiment, if it determines not to compensate the transmission data, the compensation module 3 operates in a stop mode and does not compensate the transmission data even when it receives it. In the second embodiment, if it determines not to compensate the transmission data, the transmission data is not sent to the compensation module 3, and therefore the transmission data is not compensated. Furthermore, if it determines not to compensate the transmission data, the compensation module 3 also does not update the compensation function. As a result, if it determines to compensate the transmission data, the compensation module 3 can compensate the transmission data using a more appropriate compensation function. Therefore, the object of the present invention is reliably achieved.

[0064] In the above description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to one skilled in the art that one or more other embodiments may be practiced without these specific details. Furthermore, in the description of "one embodiment" or "an embodiment" herein, all references to an ordinal number or other designation should be understood to include specific aspects, structures, and features of the present invention. Furthermore, although multiple variations may be incorporated into a single embodiment, drawing, or description thereof, this is for the purpose of streamlining the description and for the purpose of understanding the multifaceted aspects of the present invention. Furthermore, one or more features or specific embodiments of one embodiment may, where appropriate, be combined with one or more features or specific embodiments of other embodiments in the practice of the present invention.

[0065] Although the embodiments and variations of the present invention have been described above, the present invention is not limited to these and encompasses all modifications and equivalent configurations as various configurations falling within the spirit and scope of the broadest interpretation. [Explanation of symbols]

[0066] 1. Signal generator 2 Signal analyzer 3 Compensation Module 31 Compensation Calculation Unit 32 Compensation Function Acquisition Unit 4 RF transceivers 5. Amplifier 6 RF couplers 7 Switch 8 First Switch 9 Second Switch 501-517 steps 601-615 Steps

Claims

1. 1. A method of reducing signal distortion performed by a communications device, the communications device including: a signal analyzer; a compensation module in signal communication with the signal analyzer; an RF transceiver in signal communication with the compensation module; and an amplifier in signal communication with the RF transceiver, the method comprising: Step A: when the signal analyzer receives a transmission signal, the signal analyzer analyzes the transmission signal to obtain time slot data indicating a time slot of the transmission signal and transmission data; A step B in which the signal analyzer determines whether the compensation module performs compensation on the transmission data based on the time slot data; When it is determined that the transmission data is not to be compensated, C-1, when the compensation module does not compensate the transmission data and the RF transceiver receives the uncompensated transmission data, converting the uncompensated transmission data into an uncompensated RF signal and sending it to the amplifier; and step C-2, when the amplifier receives the uncompensated RF signal, amplifying the uncompensated RF signal. How to reduce signal distortion.

2. Step C-1 is the signal analyzer controls the compensation module to operate in a stop mode and sends the transmission data to the compensation module; the compensation module operates in the stop mode, so that when the compensation module receives the transmission data, it does not compensate the transmission data and transmits the uncompensated transmission data to the RF transceiver; When the RF transceiver receives the uncompensated transmission data, it converts the uncompensated transmission data into the uncompensated RF signal and transmits it to the amplifier. The method of reducing signal distortion according to claim 1 .

3. The communication device further includes an RF coupler signally connecting to the RF transceiver and the amplifier, and the method further comprises: When it is determined that the transmission data is not to be compensated, Step C-3, in which the amplifier further transmits the amplified and uncompensated RF signal to the RF coupler; Step C-4: when the RF coupler receives the amplified uncompensated RF signal, generating an uncompensated RF coupling signal based on the amplified uncompensated RF signal and transmitting the uncompensated RF coupling signal to the RF transceiver; Step C-5, when the RF transceiver receives the uncompensated RF coupling signal, converts the uncompensated RF coupling signal into uncompensated RF coupling data and sends it to the compensation module; and step C-6, wherein the compensation module operates in the stopped mode, and therefore does not update the compensation function of the compensation module even when it receives the uncompensated RF coupling data. The method of reducing signal distortion according to claim 2.

4. the communication device further includes a switch signally coupled to the signal analyzer, the compensation module, and the RF transceiver; Step C-1 is the signal analyzer controls the switch to form a channel between the signal analyzer and the RF transceiver, and transmits the transmission data to the RF transceiver via the channel; When the RF transceiver receives the uncompensated transmission data, it converts the uncompensated transmission data into the uncompensated RF signal and transmits it to the amplifier; In step C-1, the transmission data sent to the RF transceiver is uncompensated. The method of reducing signal distortion according to claim 1 .

5. the communication device further includes a switch for signally connecting to the RF transceiver and for signally connecting to the compensation module, and an RF coupler for signally connecting to the RF transceiver and the amplifier; When the method determines not to compensate the transmission data, Step C-3, in which the signal analyzer further controls the switch to open, so that the switch is not signally connected to the compensation module; Step C-4, in which the amplifier further transmits the amplified, uncompensated RF signal to the RF coupler; Step C-5: when the RF coupler receives the amplified uncompensated RF signal, generating an uncompensated RF coupling signal based on the amplified uncompensated RF signal and transmitting the uncompensated RF coupling signal to the RF transceiver; and C-6, when the RF transceiver receives the uncompensated RF coupling signal, converting the uncompensated RF coupling signal into uncompensated RF coupling data.

5. The method of reducing signal distortion according to claim 4.

6. The communication device further includes an RF coupler signally connecting to the RF transceiver and the amplifier, and the method further comprises: When it is determined that the transmission data is to be compensated, Step D-1 in which the signal analyzer sends the transmission data to the compensation module; Step D-2, in which the compensation module receives the transmission data, compensates the transmission data using a compensation function, and sends the compensated transmission data to the RF transceiver; Step D-3, when the RF transceiver receives the compensated transmission data, converts the compensated transmission data into a compensated RF signal and transmits it to the amplifier; and step D-4, when the amplifier receives the compensated RF signal, amplifying the compensated RF signal and transmitting it to the RF coupler. The method of reducing signal distortion according to claim 1 .

7. When it is determined that the transmission data is to be compensated, Step D-5: when the RF coupler receives the amplified compensated RF signal, generating a compensated RF coupling signal based on the amplified compensated RF signal and transmitting the compensated RF coupling signal to the RF transceiver; Step D-6, when the RF transceiver receives the compensated RF coupling signal, converts the compensated RF coupling signal into compensated RF coupling data and sends it to the compensation module; and D-7, wherein the compensation module updates the compensation function based on the compensated RF coupling data and the transmission data.

7. The method for reducing signal distortion according to claim 6.

8. Step D-7 includes the compensation module calculating a transformation matrix based on the compensated RF coupling data and the transmission data to transform the transmission data into the compensated RF coupling data, calculating an inverse matrix of the transformation matrix, and updating the compensation function using the inverse matrix.

8. The method of reducing signal distortion according to claim 7.

9. In step B, the signal analyzer determines whether to compensate the transmission data by determining whether the time slot indicated by the time slot data is used for outputting a low-power signal. The method of reducing signal distortion according to claim 1 .

10. a signal analyzer; a compensation module in signal communication with the signal analyzer; an RF transceiver signally coupled to the compensation module; an amplifier in signal communication with the RF transceiver; the signal analyzer is configured to, upon receiving a transmission signal, analyze the transmission signal to obtain time slot data indicating a time slot of the transmission signal and transmission data, and determine whether to perform compensation on the transmission data based on the time slot data; When determining not to compensate the transmission data, the compensation module is configured to not compensate the transmission data; when the RF transceiver receives the uncompensated transmission data, the RF transceiver is configured to convert the uncompensated transmission data into an uncompensated RF signal and send it to the amplifier; and when the amplifier receives the uncompensated RF signal, the amplifier is configured to amplify the uncompensated RF signal. Communication equipment.

11. When determining not to compensate the transmission data, the signal analyzer is further configured to control the compensation module to operate in a stop mode and send the transmission data to the compensation module, and the compensation module is further configured to operate in the stop mode, and therefore not compensate the transmission data even when it receives the transmission data, and send the uncompensated transmission data to the RF transceiver. The communication device according to claim 10.

12. further comprising an RF coupler signally connecting the RF transceiver and the amplifier; When it is determined not to compensate the transmission data, the amplifier is further configured to transmit the amplified uncompensated RF signal to the RF coupler; when the RF coupler receives the amplified uncompensated RF signal, the RF coupler is configured to generate an uncompensated RF coupling signal based on the amplified uncompensated RF signal and transmit the uncompensated RF coupling signal to the RF transceiver; when the RF transceiver receives the uncompensated RF coupling signal, the RF transceiver is further configured to convert the uncompensated RF coupling signal into uncompensated RF coupling data and transmit the uncompensated RF coupling data to the compensation module; and since the compensation module operates in the stop mode, the compensation module is further configured not to update a compensation function of the compensation module even when the uncompensated RF coupling data is received. The communication device according to claim 11.

13. a switch signally coupled to the signal analyzer, the compensation module, and the RF transceiver; When determining not to compensate the transmission data, the signal analyzer is further configured to control the switch to form a channel between the signal analyzer and the RF transceiver, and transmit the transmission data to the RF transceiver via the channel, wherein the transmission data transmitted to the RF transceiver is uncompensated. The communication device according to claim 10.

14. a switch for signally connecting to the RF transceiver and for signally connecting to the compensation module; and an RF coupler for signally connecting to the RF transceiver and the amplifier; When determining not to compensate the transmission data, the signal analyzer is further configured to control the switch to open the switch, so that the switch is not signally connected to the compensation module; the amplifier is further configured to transmit the amplified uncompensated RF signal to the RF coupler; when the RF coupler receives the amplified uncompensated RF signal, the RF coupler is further configured to generate an uncompensated RF coupling signal based on the amplified uncompensated RF signal and transmit the uncompensated RF coupling signal to the RF transceiver; when the RF transceiver receives the uncompensated RF coupling signal, the RF transceiver is further configured to convert the uncompensated RF coupling signal into uncompensated RF coupling data.

14. The communication device of claim 13.

15. further comprising an RF coupler signally connecting the RF transceiver and the amplifier; When it is determined that the transmission data should be compensated, the signal analyzer is further configured to send the transmission data to the compensation module, the compensation module is further configured, upon receiving the transmission data, to compensate the transmission data using a compensation function and to send the compensated transmission data to the RF transceiver, the RF transceiver is further configured, upon receiving the compensated transmission data, to convert the compensated transmission data into a compensated RF signal and send it to the amplifier, and the amplifier is further configured, upon receiving the compensated RF signal, to amplify the compensated RF signal and send it to the RF coupler. The communication device according to claim 10.

16. When determining to compensate for the transmission data, the RF coupler is configured, upon receiving the amplified compensated RF signal, to generate a compensated RF coupling signal based on the amplified compensated RF signal and transmit the compensated RF coupling signal to the RF transceiver; when receiving the compensated RF coupling signal, the RF transceiver is further configured to convert the compensated RF coupling signal into compensated RF coupling data and transmit the compensated RF coupling data to the compensation module; and the compensation module is further configured to update the compensation function based on the compensated RF coupling data and the transmission data.

16. The communication device of claim 15.

17. the compensation module is configured to calculate a transformation matrix that transforms the transmission data into the compensated RF coupling data based on the compensated RF coupling data and the transmission data, calculate an inverse matrix of the transformation matrix, and update the compensation function using the inverse matrix.

17. The communication device of claim 16.

18. The signal analyzer is configured to determine whether the time slot indicated by the time slot data is used to output a low-power signal, thereby determining whether to compensate the transmission data. The communication device according to claim 10.

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