WO2022062378A1 - Système de pré-distorsion, système amplificateur de puissance radiofréquence, système tdd et système fdd - Google Patents

Système de pré-distorsion, système amplificateur de puissance radiofréquence, système tdd et système fdd Download PDF

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Publication number
WO2022062378A1
WO2022062378A1 PCT/CN2021/088418 CN2021088418W WO2022062378A1 WO 2022062378 A1 WO2022062378 A1 WO 2022062378A1 CN 2021088418 W CN2021088418 W CN 2021088418W WO 2022062378 A1 WO2022062378 A1 WO 2022062378A1
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unit
radio frequency
predistortion
power amplifier
switch
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PCT/CN2021/088418
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English (en)
Chinese (zh)
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李华鸿
李军
龚丽萍
梁发兴
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浙江三维利普维网络有限公司
三维通信股份有限公司
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Publication of WO2022062378A1 publication Critical patent/WO2022062378A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a predistortion system, a radio frequency power amplifier system, a TDD system and an FDD system.
  • the linear modulation method is more and more widely used, therefore, it is necessary for the radio frequency system to have good linearity or linearity.
  • the linearization of the output of the radio frequency power amplifier system has become the focus of modern communication systems.
  • the existing Anti-distortion in advance to compensate the nonlinear distortion generated by the power amplifier components, thereby improving the stability of the RF power amplifier system and widening the frequency width.
  • Pre-distortion systems include two categories: Digital Pre-Distortion (DPD) and Analog Pre-Distortion (APD).
  • DPD Digital Pre-Distortion
  • APD Analog Pre-Distortion
  • the pre-distortion systems of existing RF power amplifier systems generally use a single digital pre-distortion or
  • the analog predistortion system has less flexibility; when faced with specific requirements for signal frequency and signal bandwidth, the existing predistortion system cannot meet the corresponding requirements.
  • Embodiments of the present application provide a predistortion system, a radio frequency power amplifier system, a TDD system, and an FDD system, so as to at least solve the problem of narrow adaptability of a single predistortion system to signal frequency and signal bandwidth in the related art.
  • an embodiment of the present application provides a predistortion system
  • the predistortion system includes a first switch, a digital predistortion unit, an analog predistortion unit, a second switch, and a feedback unit; wherein the first switch is used for selectively connecting the radio frequency signal input terminal to one of the digital predistortion unit and the analog predistortion unit; the second switch is used to selectively connect the digital predistortion unit to the analog predistortion unit One of the predistortion units is connected to the radio frequency power amplifier module; the input end of the feedback unit is connected to the output end of the radio frequency power amplifier module, and the output end of the feedback unit is respectively connected to the digital predistortion unit and the analog predistortion unit unit, the feedback unit is configured to sample a feedback signal reflecting the change of the radio frequency signal output by the radio frequency power amplifier module and selectively feed the feedback signal to one of the analog predistortion unit and the digital predistortion unit.
  • the predistortion system further includes a main control unit, the main control unit is respectively connected to the first switch, the second switch, the analog predistortion unit and the digital predistortion unit, wherein ,
  • the main control unit is at least used to control the first switch to selectively connect the radio frequency signal input terminal to one of the digital predistortion unit and the analog predistortion unit, and to control the second switch to selectively Connect one of the digital predistortion unit and the analog predistortion unit to the radio frequency power amplifier module, and control the analog predistortion unit to perform predistortion processing and control on the radio frequency signal input to the analog predistortion unit
  • the digital predistortion unit performs predistortion processing on the radio frequency signal input to the digital predistortion unit.
  • the predistortion system further includes a DSP unit, the input end of the DSP unit is connected to the output end of the feedback unit, and the output end of the DSP unit is connected to the main control unit and the main control unit respectively.
  • the feedback unit includes a first coupler and a third switch, wherein the first coupler includes a first input end, a first output end and a second output end, and the third switch includes a seventh port, eighth port and ninth port, the first input end is connected to the output end of the radio frequency power amplifier module, the first output end is connected to the radio frequency signal output end, and the second output end is connected to the first Seven ports, the eighth port is connected to the analog predistortion unit, and the ninth port is connected to the DSP unit; wherein, the first coupler is used for sampling feedback reflecting the change of the radio frequency signal output by the radio frequency power amplifier module signal, the third switch is used to selectively connect the seventh port with one of the eighth port and the ninth port, so that the feedback signal is fed into the analog predistortion unit and one of the DSP units.
  • the analog predistortion unit includes a first signal acquisition unit, a first predistortion unit, a delay circuit unit, and a correction signal output unit, and the first signal acquisition unit is provided with a second input terminal and a third output. terminal and a fourth output terminal, the correction signal output unit is provided with a third input terminal, a fourth input terminal and a fifth output terminal, the second input terminal is connected to the third port of the first switch, the first The three output terminals are connected to the input terminal of the delay circuit unit, the fourth output terminal is connected to the input terminal of the first predistortion unit, and the output terminal of the first predistortion unit is connected to the third input terminal, The output end of the delay circuit unit is connected to the fourth input end, and the fifth output end is connected to the fifth port of the second switch; wherein, the first signal acquisition unit is used for the input radio frequency signal Sampling is performed, and the sampled first sampling signal is sent to the first predistortion unit; the first predistortion unit is used
  • the first signal acquisition unit includes a second coupler
  • the correction signal output unit includes a third coupler
  • the first switch and the second switch are both SPDT radio frequency microwave electronic switches; and/or the third switch is a SPDT radio frequency microwave electronic switch.
  • an embodiment of the present application provides a radio frequency power amplifier system
  • the radio frequency power amplifier system includes a predistortion system and a radio frequency power amplifier module, an input end of the predistortion system is connected to a radio frequency signal input end, and an input end of the predistortion system is connected to a radio frequency signal input end.
  • the output end is connected to the input end of the radio frequency power amplifier module, and the output end of the radio frequency power amplifier module is connected to the output end of the radio frequency power amplifier system, wherein the predistortion system includes the predistortion system of the first aspect.
  • the radio frequency power amplifier module includes a plurality of cascaded radio frequency amplifying units, and each of the radio frequency amplifying units includes at least one radio frequency amplifier, wherein the radio frequency amplifier is used for outputting an output terminal along the predistortion system.
  • the output RF signal is amplified.
  • an embodiment of the present application provides a TDD system, including a first radio frequency power amplifier system, a first isolator, a first antenna, a fourth switch, and a first power amplifier uplink;
  • the first isolator includes a first isolator Five input ends, a sixth output end and a seventh output end
  • the fourth switch includes a tenth port, an eleventh port and a twelfth port, the input end of the first radio frequency power amplifier system is connected to the radio frequency signal input end, The output end of the first radio frequency power amplifier system is connected to the fifth input end, the sixth output end is connected to the first antenna, the seventh output end is connected to the tenth port, and the eleventh port
  • the input end of the uplink of the first power amplifier is connected, and the twelfth port is pulled down to the ground, wherein the first radio frequency power amplifier system includes the radio frequency power amplifier system of the second aspect.
  • the fourth switch includes a single-pole double-throw radio frequency microwave electronic switch, and/or the first power amplifier uplink includes a radio frequency amplifier.
  • an embodiment of the present application provides an FDD system, including a second power amplifier downlink and a second power amplifier uplink arranged in parallel; wherein the second power amplifier downlink includes a second radio frequency connected in sequence A power amplifier system and a second isolator, the output end of the second radio frequency power amplifier system is connected to the input end of the second isolator, and the second radio frequency power amplifier system includes the radio frequency power amplifier system described in the second aspect; the The second power amplifier uplink includes a radio frequency amplifier.
  • the present application provides a predistortion system, a radio frequency power amplifier system, a TDD system and an FDD system.
  • the predistortion system includes a first switch, a digital predistortion unit, an analog predistortion unit, a second switch and a feedback unit; the first switch is used to selectively connect the radio frequency signal input end with one of the digital predistortion unit and the analog predistortion unit; the second switch is used to selectively connect one of the digital predistortion unit and the analog predistortion unit One is connected to the radio frequency power amplifier module; the input end of the feedback unit is connected to the output end of the radio frequency power amplifier module, the output end of the feedback unit is respectively connected to the digital predistortion unit and the analog predistortion unit, and the feedback unit is used to sample and reflect the radio frequency signal output by the radio frequency power amplifier module The changing feedback signal is selectively fed into the analog predistortion unit or the digital predistortion unit.
  • the digital predistortion unit or the analog predistortion unit is connected with the RF power amplifier module, which is suitable for predistortion of different frequencies and signal bandwidths, and realizes the analog predistortion system and the digital predistortion system. Switching within the same power amplifier module solves the problem of narrow adaptability of a single predistortion system to signal frequency and signal bandwidth, making the RF power amplifier system adapt to multi-band and multi-standard modulation methods, and maintain the linearity of the output signal.
  • FIG. 1 is a schematic structural diagram of a connection between a predistortion system and a radio frequency power amplifier module according to an embodiment of the present application;
  • FIG. 2 is a schematic structural diagram 1 of the connection between a predistortion system and a radio frequency power amplifier module according to a preferred embodiment of the present application;
  • FIG. 3 is a second structural schematic diagram of the connection between a predistortion system and a radio frequency power amplifier module according to a preferred embodiment of the present application;
  • FIG. 4 is a schematic diagram of a topology structure of the connection between a predistortion system and a radio frequency power amplifier module according to a preferred embodiment of the present application;
  • FIG. 5 is a schematic structural diagram of a radio frequency power amplifier system according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a TDD system according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of an FDD system according to an embodiment of the present application.
  • Words like "connected,” “connected,” “coupled,” and the like referred to in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
  • the “plurality” referred to in this application means greater than or equal to two.
  • “And/or” describes the association relationship between associated objects, indicating that there can be three kinds of relationships. For example, “A and/or B” can mean that A exists alone, A and B exist at the same time, and B exists alone.
  • the terms “first”, “second”, “third”, etc. involved in this application are only to distinguish similar objects, and do not represent a specific order for the objects.
  • the various technologies described in this application can be used in various wireless communication systems, such as 2G, 3G, 4G, 5G communication systems and next-generation communication systems, such as the Global System for Mobile communications (GSM for short), Code Division Multiple Access (CDMA) system, Time Division Multiple Access (TDMA) system, Wideband Code Division Multiple Access Wireless (WCDMA), frequency Frequency Division Multiple Access (Frequency Division Multiple Addressing, referred to as FDMA) system, Orthogonal Frequency Division Multiple Access (Orthogonal Frequency-Division Multiple Access, referred to as OFDMA) system, Single-Carrier FDMA (SC-FDMA) system, General Packet Radio Service ( General Packet Radio Service, referred to as GPRS) system, Long Term Evolution (Long Term Evolution, referred to as LTE) system, 5G New Radio (New Radio, referred to as NR) system and other such communication systems.
  • GSM Global System for Mobile communications
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • the predistortion system and the radio frequency power amplifier system provided in this application can be integrated into a base station, a radio remote unit (Radio Remote Unit, RRU for short), or any other network element equipment that needs to perform radio frequency transmission and reception.
  • a base station in this application may be a device in an access network that communicates with wireless terminals over the air interface through one or more sectors.
  • the base station can be used to convert received air frames and Internet Protocol (IP) packets to each other, and act as a router between the wireless terminal and the rest of the access network, where the rest of the access network can include IP The internet.
  • IP Internet Protocol
  • the base station may also coordinate attribute management of the air interface.
  • the base station may be a base station (Base Transceiver Station, abbreviated as BTS) in GSM or CDMA, a base station (Node B) in WCDMA, or an evolved base station (evolutional Node B, abbreviated as eNB) in LTE or e-Node B), and may also be a generation Node B in 5G NR (referred to as gNB for short), which is not limited in this application.
  • BTS Base Transceiver Station
  • Node B base station
  • eNB evolved base station
  • gNB generation Node B in 5G NR
  • Pre-distortion is to pre-distort the input signal by inserting a pre-distortion module (PD) with the opposite characteristics of the characteristic response of the power amplifier element between the input signal and the power amplifier element (PA), and then send it to the power amplifier element.
  • a pre-distortion module PD
  • PA power amplifier
  • Digital pre-distortion (Digital Pre-Distortion, DPD) is mainly used to pre-distort the signal whose single carrier is a wideband signal (5MHz-100MHz).
  • the digital pre-distortion is pre-distorted by the integrated DPD algorithm.
  • Analog pre-distortion (Analog Pre-Distortion, APD) is mainly used to pre-distort the signal whose single carrier is a narrowband signal (200KHz ⁇ 5MHz). Meanwhile, analog predistortion is mainly used in radio frequency predistortion.
  • a digital signal processing chip (Digital Signal Processor, DSP) is a unique microprocessor, a device that processes a large amount of information with digital signals. In mobile communication products, it is usually used to cooperate with DPD to realize the algorithm function of signal nonlinear compensation.
  • DSP Digital Signal Processor
  • FIG. 1 is a schematic structural diagram of the connection between a predistortion system and a radio frequency power amplifier module according to an embodiment of the present application.
  • the predistortion system 100 includes a first switch 101, a digital predistortion unit 102, an analog predistortion unit 103, a Two switches 104 and a feedback unit 106; wherein, the first switch 101 is used to selectively connect the radio frequency signal input terminal RF-IN to one of the digital predistortion unit 102 and the analog predistortion unit 103; the second switch 104 is used for Selectively connect one of the digital predistortion unit 102 and the analog predistortion unit 102 to the radio frequency power amplifier module 200; the input end of the feedback unit 106 is connected to the output end of the radio frequency power amplifier module 200, and the output end of the feedback unit 106 is respectively connected to the digital predistortion unit.
  • the distortion unit 102 and the analog predistortion unit 103, and the feedback unit 106 is used to sample the feedback signal reflecting the change of the radio frequency signal output by the radio frequency power amplifier module 200 and selectively feed it into one of the analog predistortion unit 103 and the digital predistortion unit 102 .
  • the first switch 101 includes a first port, a second port and a third port; the second switch 104 includes a fourth port, a fifth port and a sixth port; the first port is connected to the radio frequency signal input terminal RF-IN , the second port is connected to the input of the digital predistortion unit 102, the output of the digital predistortion unit 102 is connected to the fourth port, the third port is connected to the input of the analog predistortion unit 103, and the output of the analog predistortion unit 103
  • the first switch 101 connects the first port with the second port, so that the RF signal input terminal RF-IN is connected with the digital predistortion unit 102, and the second switch 104
  • the fourth port is connected with the sixth port, and the digital predistortion unit 102 is connected with the radio frequency power amplifier module 200;
  • the second switch 104 is connected to connect the fifth port with the sixth port, so that the analog predistortion unit 103 is connected to the radio frequency power amplifier
  • the first switch 101 and the second switch 104 are both single-pole double-throw radio frequency microwave electronic switches.
  • the radio frequency signal input terminal RF-IN is connected to the digital signal through the first switch 101
  • the predistortion unit 102, the digital predistortion unit 102 is connected to the radio frequency power amplifier module 200 through the second switch 104, the output of the radio frequency power amplifier module 200 is connected to the feedback unit 106, the radio frequency signal input terminal RF-IN, the first switch 101, the digital predistortion unit 102 and
  • the second switch 104 corrects the digital pre-distortion algorithm based on the signal fed back by the feedback unit 106 to form a corresponding digital pre-distortion link;
  • the first switch 101 connects the first port with the third port, and the second switch 104 connects the fifth port with the
  • the RF signal input terminal RF-IN is connected to the analog predistortion unit 103 through the first switch 101 , the analog pred
  • the digital predistortion unit 102 in this embodiment of the present application stores a corresponding DPD algorithm, and the DPD algorithm cooperates with the radio frequency power amplifier module 200 to adaptively maintain the output linearity of the radio frequency power amplifier module 200 .
  • the analog predistortion unit 103 cooperates with the radio frequency power amplifier module 200 through an internal analog predistortion link to adaptively maintain the output linearity of the radio frequency power amplifier module 200 .
  • the digital predistortion unit 102 is implemented by an integrated digital processing chip, wherein the integrated digital processing chip is configured with a DSP function block, which can realize DPD correction, but because the integrated digital processing chip does not support DPD correction in the dedicated network frequency band Therefore, in the embodiment of the application, for a private network product in a special private network frequency band, it is necessary to realize signal correction through the APD function, so as to obtain the output linearity that meets the product requirements.
  • the embodiment of the present application also implements narrowband signal correction through the APD function, which is used to solve the problem that the correction effect of the narrowband signal with the processing frequency of the DPD algorithm in the range of 200KHz-5MHz is not ideal.
  • the predistortion system of the embodiment of the present application controls the first switch 101 It is switched on with the second switch 104 to realize the communication between the digital predistortion unit 102 or the analog predistortion unit 103 and the radio frequency power amplifier module 200, so as to apply the predistortion of different frequencies and signal bandwidths, and realize the analog predistortion system and the digital predistortion system.
  • Switching within the same power amplifier module solves the problem of the narrow adaptability of a single predistortion system to signal frequency and signal bandwidth in the related art, making the RF power amplifier system adapt to multi-band and multi-standard modulation methods, keeping the output signal with good linearity Spend.
  • FIG. 2 is a schematic structural diagram 1 of the connection between the pre-distortion system and the radio frequency power amplifier module according to the preferred embodiment of the present application.
  • the pre-distortion system 100 further includes a main control unit 105.
  • the main control unit 105 is connected to the first switch 101 respectively.
  • the second switch 104, the analog predistortion unit 103 and the digital predistortion unit 102 are connected, wherein the main control unit 105 is at least used to control the first switch 101 to selectively connect the radio frequency signal input terminal (corresponding to the first port) with the digital predistortion unit 102.
  • One of the distortion unit 102 (corresponding to the second port) and the analog predistortion unit 103 (corresponding to the third port) is connected, and the second switch 104 is controlled to connect the digital predistortion unit 102 (corresponding to the fourth port) and the analog predistortion unit 103 ( Corresponding to the fifth port), one of which is selectively connected to the radio frequency power amplifier module 200 (corresponding to the sixth port), and controls the analog predistortion unit 103 to perform predistortion processing on the radio frequency signal input to the analog predistortion unit 103 along the third port, and The digital predistortion unit 102 is controlled to perform predistortion processing on the radio frequency signal input to the digital predistortion unit 102 along the second port.
  • the main control unit 105 outputs a switching instruction, controls the first switch 101 to connect the first port with the second port, and controls the second switch 104 to connect the fourth port with the sixth port, so that the radio frequency signal input end
  • the RF-IN is connected to the digital predistortion unit 102 through the first switch 101, and the digital predistortion unit 102 is connected to the radio frequency power amplifier module 200 through the second switch 104, thereby forming a digital predistortion chain; at the same time, the digital predistortion unit 102 is connected by
  • the stored DPD algorithm cooperates with the radio frequency power amplifier module 200 to adaptively maintain the output linearity of the radio frequency power amplifier module 200 .
  • the main control unit 105 outputs a switching instruction, controls the first switch 101 to connect the first port with the third port, and controls the second switch 104 to connect the fifth port with the sixth port, so that the radio frequency signal input end
  • the RF-IN is connected to the analog predistortion unit 103 through the first switch 101, and the analog predistortion unit 103 is connected to the RF power amplifier module 200 through the second switch 104, thereby forming an analog predistortion chain; at the same time, the analog predistortion unit 103 is connected through
  • the internal analog predistortion link cooperates with the radio frequency power amplifier module 200 to adaptively maintain the output linearity of the radio frequency power amplifier module 200 .
  • the main control unit 105 includes but is not limited to one of the following: a single-chip microcomputer, a PFGA, and a DSP.
  • the main control unit 105 is connected to the analog predistortion unit 103 through SPI serial communication, and is also connected to the digital predistortion unit 102 through SPI serial communication.
  • FIG. 3 is a second structural schematic diagram of the connection between the predistortion system and the radio frequency power amplifier module according to the preferred embodiment of the present application.
  • the predistortion system 100 further includes a DSP unit 109 , and the input end of the feedback unit 106 is connected to the radio frequency power amplifier module 200 .
  • the output end of the feedback unit 106 is connected to the analog predistortion unit 103 and the DSP unit 109 respectively.
  • the DSP unit 109 is also connected to the main control unit 105 and the digital predistortion unit 102, wherein the feedback unit 106 is used for sampling and responding to the RF power amplifier.
  • the changed feedback signal of the radio frequency signal output by the module 200 is selectively fed into one of the analog predistortion unit 103 and the DSP unit 109 ;
  • the DSP unit 109, the module predistortion unit 103 and the main control unit 105 are all connected through SPI serial communication, and the main control unit 105 can control the DSP unit 109 to perform digital signal processing on the feedback signal and control the DSP unit 109 to communicate with Data interaction of the digital predistortion unit 102 .
  • the feedback signal fed into the analog predistortion unit 103 is used as the feedback data support of the analog predistortion algorithm corresponding to the analog predistortion link inside the analog predistortion unit 103 .
  • the feedback signal fed into the digital predistortion unit 102 is first fed into the DSP unit 109, the DSP unit 109 performs digital signal processing on the feedback signal, and the DSP unit 109 completes the digital signal processing and transmits it to the digital predistortion unit 102, and the processed feedback signal is used as the feedback data support of the digital pre-distortion algorithm stored in the digital pre-distortion unit 102, and at the same time, the digital pre-distortion algorithm can also be stored in the DSP unit 109.
  • the digital pre-distortion unit 102 performs digital pre-distortion processing on the radio frequency signal to form data.
  • FIG. 4 is a schematic diagram of the topology of the connection between the predistortion system and the radio frequency power amplifier module according to the preferred embodiment of the present application.
  • the feedback unit 106 includes a first coupler 107 and a third switch 108 , wherein the first coupler 107 includes a first input end, a first output end and a second output end, the third switch 108 includes a seventh port, an eighth port and a ninth port, the first input end is connected to the output end of the radio frequency power amplifier module 200, the first output end The terminal is connected to the RF signal output terminal RF-OUT, the second output terminal is connected to the seventh port, the eighth port is connected to the analog predistortion unit 103, and the ninth port is connected to the DSP unit 109; wherein, the first coupler 107 is used for sampling and responding to the RF power amplifier.
  • the feedback signal of the RF signal change output by the module 200, the third switch 108 is used to selectively connect the seventh port with one of the eighth port and the ninth port, so that the feedback signal is fed into the analog predistortion unit 103 and the DSP correspondingly One of the units 109.
  • the third switch 108 is a single-pole double-throw radio frequency microwave electronic switch.
  • the analog predistortion unit 103 includes a first signal acquisition unit 11, a first predistortion unit 12, a delay circuit unit 13 and a correction signal output unit 14, and the first signal acquisition unit 11 is provided with a second input terminal, a first Three output terminals and a fourth output terminal, the correction signal output unit 14 is provided with a third input terminal, a fourth input terminal and a fifth output terminal, the second input terminal is connected to the third port, and the third output terminal is connected to the delay circuit unit 13 , the fourth output end is connected to the input end of the first predistortion unit 12, the output end of the first predistortion unit 12 is connected to the third input end, the output end of the delay circuit unit 13 is connected to the fourth input end, the fifth The output end is connected to the fifth port; wherein, the first signal acquisition unit 11 is used for sampling the input radio frequency signal, and transmits the sampled first sampled signal to the first predistortion unit 12; the first predistortion unit 12 is used for The correction signal is generated
  • the first signal acquisition unit 11 includes a second coupler
  • the correction signal output unit 14 includes a third coupler.
  • the radio frequency power amplifier signal is connected to the radio frequency signal input terminal RF_IN, the first switch 101 connects the first port with the second port, and the radio frequency power amplifier signal passes through the first port and the second port.
  • a switch 101 flows to the digital predistortion unit 102, after that, the second switch 104 connects the fourth port with the sixth port, and the digitally predistorted radio frequency signal flows to the radio frequency power amplifier module 200 through the second switch 104, and passes through the radio frequency power amplifier module.
  • the 200 is amplified and output along the RF signal output terminal RF_OUT; after the amplified RF signal passes through the first coupler 107, the output RF signal is sampled to obtain a feedback signal, and the feedback signal flows to the third switch 108, and the third switch 108 will
  • the seventh port is connected to the ninth port, and after the feedback signal is transmitted to the DSP unit 109 , the DSP unit 109 uses the feedback signal as the feedback data support of the digital predistortion algorithm stored in the digital predistortion unit 102 .
  • the digital predistortion algorithm may be stored in the digital predistortion unit 102 itself, or may be stored in the DSP unit 109. In this embodiment of the present application, the digital predistortion algorithm is stored in the DSP unit 106.
  • the radio frequency power amplifier signal is connected to the radio frequency signal input terminal RF_IN, the first switch 101 connects the first port with the third port, and the radio frequency power amplifier signal passes through the first port and the third port.
  • a switch 101 flows to the analog predistortion unit 103, and the RF power amplifier signal flowing to the analog predistortion unit 103 is first coupled to the first predistortion unit 12 and the delay circuit unit 13 through the first signal acquisition unit 11, and the delay circuit unit 13 pairs The RF power amplifier signal undergoes a delay of 0 to 4 ns.
  • the first predistortion unit 12 quantifies the RF power amplifier signal and generates a correction signal.
  • the delayed RF power amplifier signal and the correction signal flow to the correction signal output unit 14 and are sent to the correction signal output unit by the correction signal output unit. 14 is superimposed and then flows to the second switch 104. After that, the second switch 104 connects the fifth port with the sixth port, and the analog predistorted radio frequency signal flows to the radio frequency power amplifier module 200 through the second switch 104 and passes through the radio frequency power amplifier module 200.
  • the first predistortion unit 12 uses the feedback signal as the feedback data support for the analog predistortion performed by the first predistortion unit 12, wherein the radio frequency power amplifier signal
  • the input RF power amplifier signal will be sampled, and the sampled signal will be input to the first predistortion unit 12 and used as the data support for the analog predistortion processing performed by the first predistortion unit 12 .
  • the unit 12 performs quantization calculation on the sampled signal and outputs a corrected signal.
  • FIG. 5 is a schematic structural diagram of a radio frequency power amplifier system according to an embodiment of the present application.
  • the radio frequency power amplifier system 300 includes a predistortion system 100 and a radio frequency power amplifier module 200 , and the input end of the predistortion system 100 is connected to the radio frequency signal input end RF -IN, the output end of the predistortion system 100 is connected to the input end of the radio frequency power amplifier module 200, and the output end of the radio frequency power amplifier module 200 is connected to the output end of the radio frequency power amplifier system 300 (refer to RF-OUT in FIG. 5), wherein the predistortion system The predistortion system 100 described above is included.
  • the radio frequency power amplifier module 200 includes a plurality of cascaded radio frequency amplifier units 21, and each radio frequency amplifier unit 21 includes at least one radio frequency amplifier, wherein the radio frequency amplifier is used for the output of the radio frequency signal along the output end of the predistortion system 100. to zoom in.
  • the radio frequency amplifier includes but is not limited to a Doherty amplifier.
  • the predistortion system 100 performs predistortion processing on the input RF power amplifier signals of different signal frequencies and signal bandwidths, and then performs amplification through the cascaded RF power amplifier modules 200.
  • "Anti-distortion” compensates the nonlinear distortion of the radio frequency power amplifier module 200, so that the input and output of the radio frequency power amplifier system 300 exhibit a linear relationship, and the radio frequency power amplifier system 300 is adapted to multi-band and multi-standard modulation.
  • FIG. 6 is a schematic structural diagram of a TDD system according to an embodiment of the present application.
  • the TDD system includes a first radio frequency power amplifier system, a first isolator 401 , and a first antenna.
  • the first isolator 401 includes a fifth input end, a sixth output end and a seventh output end
  • the fourth switch 403 includes a tenth port, an eleventh port and The twelfth port, the input end of the first radio frequency power amplifier system is connected to the radio frequency signal input end RF-IN, the output end of the first radio frequency power amplifier system is connected to the fifth input end, the sixth output end is connected to the first antenna 402, and the seventh output end
  • the tenth port is connected, the eleventh port is connected to the input end of the uplink 404 of the first power amplifier, and the twelfth port is pulled down to the ground, wherein the first radio frequency power amplifier system includes the above-mentioned radio frequency power amplifier system 300 .
  • the fourth switch 403 includes a single-pole double-throw radio frequency microwave electronic switch, and/or the first power amplifier uplink 404 includes a radio frequency amplifier.
  • the first isolator 401 can be a ring coupler.
  • FIG. 7 is a schematic structural diagram of an FDD system according to an embodiment of the present application.
  • the FDD system includes a second power amplifier downlink and a second power amplifier uplink set in parallel Circuit 501; wherein, the second power amplifier downlink includes a second radio frequency power amplifier system and a second isolator 502 connected in sequence, the output end of the second radio frequency power amplifier system is connected to the input end of the second isolator 502, and the second radio frequency power amplifier
  • the system includes the above-mentioned radio frequency power amplifier system 300; the second power amplifier uplink 501 includes a radio frequency amplifier.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un système de pré-distorsion, un système amplificateur de puissance radiofréquence, un système TDD et un système FDD. Le système de pré-distorsion comprend un premier commutateur (101), une unité de pré-distorsion numérique (102), une unité de pré-distorsion analogique (103), un second commutateur (104) et une unité de rétroaction (106). Le premier commutateur (101) est utilisé pour connecter sélectivement une borne d'entrée de signal radiofréquence à une unité parmi l'unité de pré-distorsion numérique (102) et l'unité de pré-distorsion analogique (103). Le second commutateur (104) est utilisé pour connecter sélectivement une unité parmi l'unité de pré-distorsion numérique (102) et l'unité de pré-distorsion analogique (103) à un module amplificateur de puissance radiofréquence (200). L'unité de rétroaction (106) est utilisée pour échantillonner un signal de rétroaction reflétant des changements dans un signal radiofréquence émis par le module amplificateur de puissance radiofréquence (200) et introduire le signal de rétroaction dans l'unité de pré-distorsion analogique (103) ou l'unité de pré-distorsion numérique (102).
PCT/CN2021/088418 2020-09-28 2021-04-20 Système de pré-distorsion, système amplificateur de puissance radiofréquence, système tdd et système fdd WO2022062378A1 (fr)

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CN117319150A (zh) * 2022-06-24 2023-12-29 中兴通讯股份有限公司 数字预失真环路时延控制方法、装置、电子设备

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