WO2022111308A1 - Unité de multiplexage par répartition en fréquence, appareil et procédé - Google Patents

Unité de multiplexage par répartition en fréquence, appareil et procédé Download PDF

Info

Publication number
WO2022111308A1
WO2022111308A1 PCT/CN2021/130370 CN2021130370W WO2022111308A1 WO 2022111308 A1 WO2022111308 A1 WO 2022111308A1 CN 2021130370 W CN2021130370 W CN 2021130370W WO 2022111308 A1 WO2022111308 A1 WO 2022111308A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
output
input signal
division multiplexing
local oscillator
Prior art date
Application number
PCT/CN2021/130370
Other languages
English (en)
Chinese (zh)
Inventor
李欧鹏
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2022111308A1 publication Critical patent/WO2022111308A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a frequency division multiplexing unit, apparatus and method.
  • Ultra-wideband signals above 20 GHz will be required to support ultra-large-capacity transmission at the terabit per second (Tbps) level.
  • Ultra-wideband signals have reached the limit of analog-to-digital converter (ADC)/digital-to-analog converter (DAC) processing, using frequency-division multiplexing (FDM) Implementation is one possible solution.
  • ADC analog-to-digital converter
  • DAC digital-to-analog converter
  • FDM frequency-division multiplexing
  • FDM is a multiplexing technology that modulates multiple signals onto different frequency carriers and then superimposes them to form a composite signal.
  • FDM provides the function of transmitting multiple data simultaneously on the same channel, greatly increasing the capacity.
  • it is necessary to use local oscillator signals of N frequencies to move the N-channel signals to different radio frequencies, and use a synthesizer for synthesis, which requires a large number of combiners and filters corresponding to frequencies. device, etc., increasing the complexity of the structure.
  • the present application provides a frequency division multiplexing unit, device and method to save the number of frequencies of local oscillator signals.
  • a frequency division multiplexing unit including a first mixer, a second mixer, and a radio frequency synthesis unit connected to the first mixer and the second mixer;
  • the first mixer is used for mixing and outputting the first signal and the local oscillator signal to obtain a first output signal
  • the second mixer is used for mixing the second signal and the local oscillator signal and outputting the obtained The second output signal; wherein, the first signal is a second input signal after adding a 90° phase shift to the first input signal, and the second signal is the second input signal adding a 90° phase shift to the second input signal a first input signal; the first input signal and the second input signal are input signals of the frequency division multiplexing unit;
  • the radio frequency synthesis unit is used for synthesizing the first output signal and the second output signal to obtain a synthesized signal, and in the synthesized signal, the first input signal and the second input signal are respectively located in the different sidebands of the local oscillator signal.
  • frequency division multiplexing of more intermediate frequency signals can be realized with the same number of frequencies of local oscillator signals, which saves the number of frequencies of local oscillator signals, and does not require a large number of combiners and filters corresponding to frequencies, Simple structure.
  • the frequency division multiplexing unit further includes a signal quadrature unit, the first output end of the signal quadrature unit is connected to the first mixer, and the first output end of the signal quadrature unit is connected to the first mixer. The two output ends are connected to the second mixer;
  • the signal quadrature unit is configured to perform equal-amplitude quadrature synthesis output on the first input signal and the second input signal to obtain the first signal and the second signal.
  • the signal quadrature unit may perform equal-amplitude quadrature synthesis output on the first input signal and the second input signal, so as to provide the first mixer and the second mixer for frequency mixing output.
  • the signal quadrature unit is a branch line bridge.
  • the signal quadrature unit can be implemented by using an analog circuit, for example, the signal quadrature unit is a branch line bridge.
  • the branch line bridge 90-degree power division can be realized, and the equal-amplitude quadrature synthesis output can be realized.
  • the signal quadrature unit is a digital signal processor.
  • the signal quadrature unit may also be implemented using a digital circuit.
  • the relationship between the first signal V a1 and the second signal V a2 is as follows:
  • V 1 is the first input signal
  • V 2 is the second input signal
  • V a1 -V 1 +jV 2
  • Vb1 jV 1 -V 2 .
  • V a1 V 1 +jV 2
  • V a1 -V 1 -jV 2
  • V b1 -jV 1 -V 2
  • the first output end of the radio frequency synthesis unit is used to output the synthesized signal
  • the frequency division multiplexing unit further includes a directional connection connected to the first output end of the radio frequency synthesis unit a coupler, the directional coupler is also connected to the digital signal processor;
  • the directional coupler is used for extracting and outputting the signal of the first power in the composite signal, and also for extracting the signal of the second power in the composite signal, and inputting the signal of the second power to the the digital signal processor;
  • the digital signal processor is configured to adjust the H according to the signal-to-noise ratio of the signal of the second power.
  • the extracted signal of the second power in the synthesized signal is input to the digital signal processor, which can be used to detect the signal-to-noise ratio of the feedback signal, thereby adjusting the value of the [H] matrix in the DSP to compensate for the power
  • the non-ideal characteristics of splitters and bridges are used to achieve the lowest detected signal-to-noise ratio.
  • the frequency division multiplexing unit further includes a power divider, and the power divider is configured to output the local oscillator signal by power division of equal amplitude and in phase;
  • the radio frequency synthesis unit includes any one of the following : Lange bridge, branch line bridge, ring bridge.
  • the frequency division multiplexing unit further includes an electric bridge, and the electric bridge is configured to output the local oscillator signal by equal-amplitude quadrature power division, and the electric bridge includes any one of the following: Langer bridge, branch line bridge, ring bridge; the radio frequency synthesis unit is a power divider.
  • the power divider is a Wilkinson power divider or a Gysel power divider.
  • the harmonic component of the first input signal is 1, the first output signal is located in the upper sideband of the local oscillator signal, and the harmonic component of the second input signal is -1, the second output signal is located in the lower sideband of the local oscillator signal;
  • the first output signal is located in the lower sideband of the local oscillator signal, and when the harmonic component of the second input signal is 1, the second output signal The signal is in the upper sideband of the local oscillator signal.
  • the first output signal and the second output signal output by the radio frequency synthesis unit are located in different sidebands of the local oscillator signal, and the harmonic components of the first input signal and the second input signal are suppressed, so that less interference can be obtained. output signal.
  • a frequency division multiplexer in a second aspect, includes a multi-stage cascaded frequency division multiplexing unit, wherein each stage includes one or more of the first aspect or the first Any one of the aspects realizes the frequency division multiplexing unit;
  • the input signal of the first-stage frequency division multiplexing unit is an intermediate frequency signal
  • the input signal of the frequency division multiplexing unit of the other stage includes the intermediate frequency signal and/or the synthesized signal output by the two frequency division multiplexing units of the previous stage.
  • the frequency division multiplexing of more intermediate frequency signals can be realized by the same number of local oscillator signals, which saves the number of frequencies of the local oscillator signals, and does not require a large number of corresponding frequencies.
  • Combiners and filters with simple structure Preferably, N local oscillators implement FDM with 2 N intermediate frequencies.
  • a frequency division multiplexing method including:
  • the first signal is a second input signal obtained by adding a 90° phase shift to the first input signal
  • the second signal is the first input signal obtained by adding a 90° phase shift to the second input signal
  • the method further includes:
  • the equal-amplitude quadrature synthesis output is performed on the first input signal and the second input signal to obtain the first signal and the second signal.
  • the relationship between the first signal V a1 and the second signal V a2 is as follows:
  • V 1 is the first input signal
  • V 2 is the second input signal
  • the method further includes:
  • the H is adjusted according to the signal-to-noise ratio of the signal of the second power.
  • the harmonic component of the first input signal is 1, the first output signal is located in the upper sideband of the local oscillator signal, and the harmonic component of the second input signal is -1, the second output signal is located in the lower sideband of the local oscillator signal;
  • the first output signal is located in the lower sideband of the local oscillator signal, and when the harmonic component of the second input signal is 1, the second output signal The signal is in the upper sideband of the local oscillator signal.
  • a computer-readable storage medium is provided, and a computer program or instruction is stored in the computer-readable storage medium.
  • the above third aspect or the third aspect is realized. any of the methods described.
  • a computer program product comprising instructions, which when run on a computer, cause the computer to execute the above third aspect or any one of the third aspects to implement the method.
  • a chip is provided, the chip is coupled with a memory, and implements any three of the third aspect or the first aspect of the embodiments of the present application to implement the communication method.
  • Coupled in the embodiments of the present application means that two components are directly or indirectly combined with each other.
  • FIG. 1 is a schematic diagram of a communication system involved in the application
  • Fig. 2 is the principle schematic diagram of FDM
  • Fig. 3 is a schematic diagram of a traditional analog FDM technology implementation scheme
  • FIG. 4 is a schematic diagram of the radio frequency front-end architecture of the device
  • FIG. 5 is a schematic structural diagram of a frequency division multiplexer provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a module of an FDM unit provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of an FDM unit of a specific example provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of the principle of the branch line bridge in the FDM unit.
  • Fig. 9 is a schematic diagram of the principle of the Wilkinson power divider in the FDM unit.
  • FIG. 11 is a schematic structural diagram of another FDM unit of a specific example provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of another FDM unit of a specific example provided by an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of another FDM unit of a specific example provided by an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of another FDM unit of a specific example provided by an embodiment of the application.
  • FIG. 15 is a schematic diagram of the principle of a directional coupler in an FDM unit provided by an embodiment of the present application.
  • 16 is a schematic flowchart of a frequency division multiplexing method provided by an embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of a signal orthogonalization apparatus provided by an embodiment of the present application.
  • FIG. 1 is a schematic diagram of a communication system involved in the present application.
  • the communication system may include at least one network device 100 (only one is shown) and one or more terminal devices 200 connected to the network device 100 .
  • the frequency division multiplexer of the present application can be applied to the terminal device 200 and the network device 100 .
  • the communication system may be a long term evolution (LTE) system, a fifth generation (5G) communication system (such as a new radio (NR) system, a communication system that integrates multiple communication technologies (such as A communication system in which LTE technology and NR technology are integrated), or a subsequent evolved communication system.
  • LTE long term evolution
  • 5G fifth generation
  • NR new radio
  • the network device 100 may be a device capable of communicating with the terminal device 200 .
  • the network device 100 may be any device with a wireless transceiver function. Including but not limited to: evolved base station eNodeB, base station in 5G communication system, base station or network equipment in future communication system, access node in WiFi system, wireless relay node, wireless backhaul node, etc.
  • the network device 100 may also be a wireless controller in a cloud radio access network (CRAN) scenario, a device-to-device (device-to-device, D2D), a vehicle-to-everything (V2X) connection ), a device that undertakes the function of a base station in machine-to-machine (M2M) communication, and the like.
  • the network device 100 may also be a small station, a transmission reference point (transmission reference point, TRP) or the like. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.
  • the terminal device 200 is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water, such as ships; it can also be deployed in the air, such as aircraft , balloons, and satellites.
  • the terminal device can be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, industrial control ( Wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety wireless terminals in smart cities, wireless terminals in smart homes, and so on.
  • VR virtual reality
  • AR augmented reality
  • Terminal equipment may also sometimes be referred to as user equipment (UE), access terminal equipment, UE unit, mobile station, mobile station, remote station, remote terminal equipment, mobile device, terminal, wireless communication device, UE Proxy or UE device etc.
  • UE user equipment
  • access terminal equipment UE unit
  • mobile station mobile station
  • remote station remote terminal equipment
  • mobile device terminal
  • wireless communication device UE Proxy or UE device etc.
  • system and “network” in the embodiments of the present application may be used interchangeably.
  • “Plurality” refers to two or more than two, and in view of this, “plurality” may also be understood as “at least two” in the embodiments of the present application.
  • “And/or”, which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, and B exists alone.
  • the character “/” unless otherwise specified, generally indicates that the related objects are an "or" relationship.
  • FDM frequency-division multiplexing
  • the schematic diagram of the traditional analog FDM technology implementation scheme if there are N intermediate frequency (intermediate frequency, IF) signals to be multiplexed, the local oscillator (local oscillator, LO) signal of N frequencies is used: ⁇ 1 , ⁇ 2 , ⁇ 3 ... ⁇ N , move the N intermediate frequency signals to different radio frequencies, and then combine them with a combiner to form a broadband signal for transmission.
  • N band pass filters (BPF) are used to filter out each radio frequency signal, and then the corresponding local oscillator signal is used to move it to an intermediate frequency for reception.
  • BPF band pass filters
  • N local oscillators can only provide FDM of N frequency bands, and a large number of combiners and filters corresponding to frequencies need to be used, which makes the structure complicated.
  • the structure is complex, and the local oscillator signals of N frequencies can only perform frequency shifting for N intermediate frequency signals
  • the embodiments of the present application provide a frequency division multiplexing unit, device and method,
  • the first signal and the second signal are mixed and output by the same local oscillator signal, and the same number of local oscillator signals can realize the frequency division multiplexing of more intermediate frequency signals, which does not require a large number of combiners and filters corresponding to frequencies, Simple structure.
  • the frequency division multiplexer provided by the embodiment of the present application may be applicable to a front-end system of a radio frequency transceiver of a terminal device and a network device.
  • the M signals output by the intermediate frequency channel are aggregated into a large bandwidth signal through the frequency division multiplexer 301 (through the N first-stage local oscillator signals 302), which are amplified and entered into
  • the RF mixer moves to the high frequency through the second-stage local oscillator signal, and transmits it through the transmitting antenna.
  • M M>N.
  • the traditional FDM method shown in FIG. 2 may also be used for part of the intermediate frequency signal, and the FDM method of the embodiment of the present application is used for part of the intermediate frequency signal, so M is greater than N and less than or equal to 2 N .
  • the frequency division multiplexer 301 includes multiple stages of cascaded FDM units, and each stage includes one or more FDM units.
  • the input signal of the FDM unit of the first stage is an intermediate frequency signal; the input signal of the FDM unit of other stages includes the intermediate frequency signal and/or the composite signal output by the two FDM units of the previous stage.
  • the input signals of the first-stage FDM unit are 2N intermediate frequency
  • the FDM units are arranged in N levels.
  • the first-level FDM unit aggregates 2N intermediate frequency signals into 2N-1 signals
  • the second-level FDM unit aggregates 2N-1 signals into 2N-2 signals
  • the Nth-level FDM unit aggregates 2 N- 1 signals Signals are aggregated into one signal.
  • the frequencies of the local oscillator signals used by the mixers in the FDM units of the same stage are the same; the frequencies of the local oscillator signals used by the mixers in the FDM units of different stages may be the same or different.
  • each stage includes one or more FDM units.
  • the input signal of each FDM can be two intermediate frequency signals, or a composite signal of the intermediate frequency signal and the output of one FDM unit of the previous stage, or the composite signal output by two FDM units of the previous stage, or an intermediate frequency signal (using the FDM technique shown in Figure 2).
  • the FDM unit 400 includes a first mixer 401, a second mixer 402, and a first mixer A radio frequency synthesis unit 403 of a mixer 401 and a second mixer 402; wherein:
  • the first mixer 401 is used to mix and output the first signal and the local oscillator signal to obtain the first output signal
  • the second mixer 402 is used to mix the second signal and the local oscillator signal to output the second signal. output signal; wherein, the first signal is the second input signal after the first input signal is added with a 90° phase shift, and the second signal is the first input signal after the second input signal is added with a 90° phase shift; the first input signal and The second input signal is the input signal of the frequency division multiplexing unit;
  • the radio frequency synthesis unit 403 is used for synthesizing the first output signal and the second output signal to obtain a synthesized signal.
  • the first input signal and the second input signal are respectively located in different sidebands of the local oscillator signal.
  • the first mixer 401 and the second mixer 402 use the same local oscillator signal (which may be a signal with a higher frequency than the first input signal and the second input signal, for example, the local oscillator signal is 2 GHz)
  • the first signal and the second signal are mixed and output, and the same local oscillator signal can realize the frequency transfer of the two intermediate frequency signals, and transfer the two intermediate frequency signals to high frequencies.
  • a wider signal can be output, and through the above mixing process, the first input signal and the second input signal are located in different sidebands of the local oscillator signal respectively .
  • the first input signal and the second input signal are respectively located in different sidebands of the local oscillator signal, which may be that the first input signal is located in the upper sideband of the local oscillator signal, and the second input signal is located in the lower sideband of the local oscillator signal; or It is that the first input signal is located in the lower sideband of the local oscillator signal, and the second input signal is located in the upper sideband of the local oscillator signal.
  • the FDM unit 400 may further include a signal quadrature unit 404, the first output end of the signal quadrature unit is connected to the first mixer 401, and the second output end of the signal quadrature unit 404 is connected to the second mixer 402 ;
  • the signal quadrature unit 404 is configured to perform equal-amplitude quadrature synthesis output on the first input signal and the second input signal to obtain the first signal and the second signal.
  • the first input signal and the second input signal are intermediate frequency signals.
  • its frequency is 20MHz.
  • the equal-amplitude quadrature synthesis output is performed on the first input signal and the second input signal to obtain the first signal and the second signal, wherein the first signal is the first input signal and the second input signal after 90° phase shift , the second signal is the first input signal after adding a 90° phase shift to the second input signal.
  • the signal orthogonalization unit 404 is optional, which is represented by a dotted line in the figure.
  • the same number of local oscillator signal frequencies can realize frequency division multiplexing of more intermediate frequency signals, which saves the number of local oscillator signal frequencies, and does not require a large number of combiners and filters corresponding to frequencies. Simple.
  • FIG. 7 it is a schematic structural diagram of an FDM unit of a specific example.
  • two intermediate frequency signals V 1 and V 2 pass through a 90-degree bridge 1 and are fed into two up-conversion mixers ( Mixer 1, mixer 2), wherein the parameters of mixer 1 and mixer 2 are the same, and the parameters include: frequency conversion loss and phase shift, driving frequency and power of the local oscillator signal, input and output frequencies and power, etc.; the mixer is driven by an in-phase local oscillator signal whose frequency is ⁇ 1 ; the outputs of the two mixers are then synthesized by a 90-degree bridge 2; finally a broadband signal is output, V 1 and V 2 are in the upper and lower sidebands of the local oscillator frequency ⁇ 1 , respectively.
  • the intermediate frequency 90° bridge 1 can use a branch line bridge to achieve 90° power division.
  • the schematic diagram of the branch line bridge shown in Figure 8 the branch line bridge belongs to a four-port directional coupler, which is composed of two pairs of transmission lines connected by a coupling device. 4.
  • the physical connection of the coupling line with a length of ⁇ /4 realizes the coupling.
  • the transmission line and coupling line impedance is the system impedance Z0
  • the 4 ports are divided into power input port, through port, coupling port, and isolation port. Coupling port and through port realize equal-amplitude quadrature output.
  • the isolation port is terminated with a resistance equal to the system impedance to absorb reflection. power.
  • Each FDM unit includes a Wilkinson power divider, which inputs a local oscillator signal to the Wilkinson power divider of the FDM unit, and the Wilkinson power divider realizes equal-amplitude in-phase power division of the local oscillator signal.
  • the schematic diagram of the Wilkinson power divider as shown in Figure 9, the Wilkinson power divider is a three-port power distribution device. A transmission line of length ⁇ /4 that splits the power in two. The end of the power division transmission line is terminated with an absorbing resistor of 2Z 0 to absorb the mismatched reflected wave.
  • a Gysel power divider may also be used.
  • the Gysel power divider is used for equal-amplitude and in-phase power division of the local oscillator signal, and its principle is similar to that of the Wilkinson power divider.
  • the frequency of the local oscillator signal used by the mixers in the FDM unit of the same stage is the same.
  • the Wilkinson power divider realizes equal-amplitude and in-phase power division of the local oscillator signal, and provides it to the two mixers in the FDM unit.
  • the radio frequency synthesis bridge (ie, the above-mentioned 90-degree bridge 2 ) adopts a Lange bridge.
  • the lange bridge uses multiple parallel lines with a length of ⁇ /4 tightly coupled, and connects alternate lines. Its four ports are power input port, through port, coupling port, and isolation port. Coupling port and through port realize equal-amplitude quadrature output, and the resistance of isolation port end connected to system impedance absorbs reflected power.
  • the RF synthesis bridge can also be replaced with a ring bridge, a branch line bridge, and the like.
  • FIG. 11 a schematic structural diagram of another FDM unit of a specific example as shown in FIG. 11 can be obtained.
  • the two sets of intermediate frequency signals V 1 and V 2 are fed through the input terminal a1 and the isolation terminal a2 of the branch line bridge, and are fed into two identical mixers 1 and 2 through the straight-through terminal b1 and the coupling terminal b2.
  • the local oscillator signals of the two mixers are fed through a Wilkinson power divider.
  • the output ends of the mixer 1 and the mixer 2 are respectively connected to the input end c1 and the isolation end c2 of the lange bridge.
  • the coupling end d2 of the lange bridge is connected to the system resistance absorbing load (the resistance value of the system resistance can be, for example, 50 ohms), and the straight end d1 is the system output port, from which the aggregated signal is output.
  • V b1 V 1 -jV 2
  • V b2 V 2 -jV 1
  • V LO is the local oscillator signal input to the mixer after power division
  • V a1 is the signal of node a1
  • V a2 is the signal of node a2
  • V b1 is the signal of node b1
  • V b2 is the signal of node b2
  • V c1 is the signal of node c1
  • V c2 is the signal of node c2
  • V d1 is the signal of node d1
  • V d2 is the signal of node d2
  • m is the harmonic component of intermediate frequency signal V 1
  • k is the signal of intermediate frequency signal V 2 Harmonic components
  • n Harmonic components of the local oscillator signal is the harmonic component of intermediate frequency signal.
  • V 1 is suppressed in the upper sideband of the local oscillator signal
  • V 1 is output in the lower sideband of the local oscillator signal
  • V 2 is output in the upper sideband of the local oscillator signal
  • V2 is suppressed in the lower sideband of the LO signal.
  • V 1 is suppressed in the upper sideband of the local oscillator signal, while V 2 is suppressed in the lower sideband of the local oscillator signal, so that V 1 and V 2 are respectively located in the local oscillator signal.
  • FIG. 12 which is a schematic structural diagram of another FDM unit as a specific example, the difference from the FDM unit shown in FIG. 7 or FIG. 11 is that a 90° bridge 3 is used to equalize the input local oscillator signal. Orthogonal power division.
  • the local oscillator signal V LO is input from the input end of the bridge 3, the bridge 3 divides the power of V LO into two, the straight end of the bridge 3 is connected to the mixer 3, and the straight end outputs V LO goes to mixer 3, the coupling end of bridge 3 is connected to mixer 4, and the coupling end outputs -j*V LO to mixer 4.
  • V LO and -j*V LO are equal-amplitude quadrature signals.
  • V LO can also be input from the isolated end of bridge 3, bridge 3 divides the power of V LO into two, the straight end of bridge 3 is connected to mixer 3, and the straight end outputs -j*V LO goes to mixer 3, the coupling end of bridge 3 is connected to mixer 4, and the coupling end outputs V LO to mixer 4.
  • the radio frequency synthesis unit is implemented by a 1:1 power divider, which can be the aforementioned Wilkinson power divider or a Geisel power divider, which is used for the mixer 3
  • the output V c1 " and the V c2 " signal output by the mixer 4 are radio-frequency synthesized to be V d ".
  • the two intermediate frequency signals of the same frequency are respectively moved to the upper and lower sidebands of the local oscillator frequency ⁇ 1, and the FDM of two frequencies is realized with one local oscillator signal. If this structure is connected in series, FDM of 2 N intermediate frequencies can be realized with N local oscillator frequencies. However, if the FDM solution shown in FIG. 2 is adopted, 2N local oscillator signals are required for FDM with 2N intermediate frequencies. Therefore, the embodiment of the present application greatly simplifies the front-end architecture.
  • the above describes how to aggregate into a large bandwidth signal through the frequency division multiplexer during the transmission process.
  • the receiving antenna After the above-mentioned large-bandwidth signal synthesized by radio frequency is transmitted in space, it is received by the receiving antenna.
  • the receiving process and the sending process are inverse processes.
  • the specific receiving process is as follows: the received large-bandwidth signal V d1 is input into the d1 node of the Lange bridge, and the Lange bridge c1 and c2 nodes output V c1 and V c2 respectively; V c1 enters the first down-conversion mixer , V c2 enters the second down-conversion mixer, the first down-conversion mixer moves V c1 to the intermediate frequency according to the local oscillator signal and V c1 , and obtains V b1 , and the second down-conversion mixer according to the local oscillator signal and V c2 , move V c2 to the intermediate frequency to obtain V b2 ; V b1 and V b2 are input to the branch line bridge to realize equal-amplitude quadrature outputs V a1 and V a2 .
  • the parameters of the first and second down-conversion mixers may be the same or different from the first and second up-conversion mixers used in the transmission process.
  • FIG. 13 it is a schematic structural diagram of another FDM unit of a specific example.
  • a digital phase shift scheme is used to replace the intermediate frequency 90-degree bridge shown in FIG. 7 .
  • the intermediate frequency signals V 1 and V 2 are processed by a digital signal processor (DSP), and the intermediate frequency signal V 1 is added to the intermediate frequency signal V 2 after 90° phase shift to obtain V a1 ′, and Adding the intermediate frequency signal V 2 to the intermediate frequency signal V 1 after being phase-shifted by 90°, V a2 ' is obtained.
  • DSP digital signal processor
  • the two signals V a1 ' and V a2 ' output by the DSP are respectively subjected to digital-to-analog conversion by the digital-to-analog converters DAC1 and DAC2 to output V a1 , V a2 .
  • the output terminal a1 of DAC1 is connected to the intermediate frequency terminal of mixer 1, and the output port a2 of DAC2 is connected to the intermediate frequency terminal of mixer 2.
  • the RF output of mixer 1 is connected to the input end b1 of the lange bridge, the RF output of mixer 2 is connected to the isolation end b2 of the lange bridge, and the coupling end c2 of the lange bridge is connected to the system resistance (for example, the resistance of the system resistance).
  • the value can be 50 ohms) to absorb the load, the straight-through terminal c1 is the system output port, and the aggregated signal is output from this.
  • V a1 -V 1 +jV 2
  • V b1 jV 1 -V 2
  • the output V a1 and V a2 are equal in magnitude and quadrature.
  • V a1 V 1 +jV 2
  • V b1 V 2 +jV 1 , ie
  • the output V a1 and V a2 are equal in magnitude and quadrature.
  • V a1 -V 1 -jV 2
  • V b1 -jV 1 -V 2
  • ie The output V a1 and V a2 are equal in magnitude and quadrature.
  • FIG. 14 which is a schematic structural diagram of another FDM unit of a specific example
  • the FDM scheme adopts a digital phase-shifting scheme with a feedback branch.
  • a digital phase-shifting scheme is used to replace the IF 90-degree bridge shown in Figure 7.
  • the intermediate frequency signals V 1 and V 2 are processed by DSP, and the intermediate frequency signal V 1 is added to the intermediate frequency signal V 2 after the 90° phase shift to obtain V a1 ′, and the intermediate frequency signal V 2 is added to the 90° shifted intermediate frequency signal V 2 .
  • the intermediate frequency signal V 1 after the phase is obtained to obtain V a2 '.
  • the two signals V a1 ' and V a2 ' output by the DSP are respectively subjected to digital-to-analog conversion by DAC1 and DAC2 to output V a1 , V a2 .
  • the output terminal a1 of DAC1 is connected to the intermediate frequency terminal of mixer 1, and the output port a2 of DAC2 is connected to the intermediate frequency terminal of mixer 2.
  • the RF output of mixer 1 is connected to the input end b1 of the lange bridge, the RF output of mixer 2 is connected to the isolation end b2 of the lange bridge, the coupling end c2 of the lange bridge is connected to the 50ohm absorbing load, and the straight end c1 is the system output port, from which the aggregated signal is output.
  • a directional coupler is connected to the output port c1 of the lange bridge, and the directional coupling is terminated with a band-pass filter (BPF) and mixer 3, which are fed into the ADC of the digital intermediate frequency.
  • BPF band-pass filter
  • the schematic diagram of the directional coupler can be seen in Figure 15.
  • the signal input from the input end is extracted with a certain power and distributed to the coupling end and the output end.
  • the signal with most power is output through the output terminal (specifically, the output terminal outputs the first power signal in the composite signal), and the signal with a small part of power is output at the coupling terminal (specifically, the coupling terminal outputs the second power signal in the composite signal) power signal), used for feedback detection of signal quality, power, etc.
  • the second power is less than or equal to the first power, and the ratio of the second power to the first power may generally be 1:10 ⁇ 1:100.
  • the signal with a small amount of power is coupled from the synthesized signal V c1 , and then enters the band-pass filter, selects a part of the narrow-band signal in the frequency band, enters the mixer 3, and converts the frequency to low frequency and sends it to the ADC.
  • the use of band-pass filters and mixers can reduce the signal bandwidth and signal frequency, avoid the use of wideband ADCs, and reduce costs.
  • the feedback signal after the ADC is sent to the processor.
  • the processor detects the signal-to-noise ratio of the feedback signal, and adjusts the value of the [H] matrix in the DSP through an algorithm to compensate for the non-ideal characteristics of the power divider and the bridge to achieve the lowest detected signal-to-noise ratio.
  • the feedback signal enters the digital intermediate frequency for processing and analyzes the signal-to-noise ratio of the signal.
  • Feedback compensation is performed by adjusting the [H] matrix in the digital IF to compensate for the amplitude or phase distortion that may be caused by non-ideal power dividers and bridges, and to improve the signal-to-noise ratio of the synthesized signal.
  • the feedback branch can also be applied to the 90-degree bridge 1 shown in FIG. 7 .
  • This scheme moves the two same-frequency intermediate frequency signals to the upper and lower sidebands of the same local oscillator by shifting, mixing, and synthesizing the input signal, and suppresses its leakage at the image frequency.
  • N local oscillator frequencies can realize FDM aggregation of 2 N intermediate frequencies, which greatly simplifies the FDM system architecture.
  • a digital intermediate frequency and a feedback loop are introduced, and the algorithm is used to adjust the signal-to-noise ratio of the feedback output signal in real time to compensate for the non-ideality of the analog device and improve the system performance.
  • the present application also provides a frequency division multiplexing method.
  • FIG. 16 which is a schematic flowchart of a frequency division multiplexing method provided by an embodiment of the present application, the method may include the following steps:
  • the first input signal and the second input signal are intermediate frequency signals.
  • its frequency is 20MHz.
  • the equal-amplitude quadrature synthesis output is performed on the first input signal and the second input signal to obtain the first signal and the second signal, wherein the first signal is the second input signal after the first input signal is added with a 90° phase shift,
  • the second signal is the first input signal obtained by adding a 90° phase shift to the second input signal.
  • this step S101 is optional, which is represented by a dotted line in the figure.
  • the same local oscillator signal (which may be a signal with a higher frequency than the first input signal and the second input signal, for example, the local oscillator signal is 2 GHz) is used to mix the first signal and the second signal respectively and output , the same local oscillator signal can realize the frequency transfer of two intermediate frequency signals, and move the two intermediate frequency signals to high frequency.
  • RF synthesis means that the output is a synthesized RF signal that can be transmitted.
  • the first input signal and the second input signal are respectively located in different sidebands of the local oscillator signal.
  • the harmonic component of the first input signal is 1, the first output signal is located in the upper sideband of the local oscillator signal, and when the harmonic component of the second input signal is -1, the second output signal is located at the lower side of the local oscillator signal or when the harmonic component of the first input signal is -1, the first output signal is located in the lower sideband of the local oscillator signal, and when the harmonic component of the second input signal is 1, the second output signal is located on the upper side of the local oscillator signal bring.
  • the relationship between the first signal V a1 and the second signal V a2 is as follows:
  • V 1 is the first input signal
  • V 2 is the second input signal
  • the method can also include the following steps:
  • the signal of the second power extracted from the composite signal is used to feed back the quality and power of the detected signal.
  • the value of the above [H] matrix can be adjusted according to an algorithm to compensate for the non-ideal characteristics of the power divider and the bridge to achieve the lowest detected signal-to-noise ratio.
  • the first signal and the second signal are mixed and output by the same local oscillator signal, and the same number of local oscillator signals can realize the frequency division multiplexing of more intermediate frequency signals. use.
  • An embodiment of the present application further provides a chip, including: at least one processor and an interface, the at least one processor is coupled to a memory through an interface, and when the at least one processor executes a computer program or instruction in the memory, the above-mentioned figure is made Step S101 in the embodiment shown in 16 is performed.
  • the chip system may be composed of chips, or may include chips and other discrete devices, which are not specifically limited in this embodiment of the present application.
  • Embodiments of the present application further provide a computer-readable storage medium, where a computer program may be stored thereon, and when the program is executed by a processor, step S101 described in the embodiment shown in FIG. 16 of the present disclosure is implemented.
  • Embodiments of the present application further provide a computer program product including instructions, which, when run on a computer, cause the computer to execute step S101 described in the embodiment shown in FIG. 16 of the present disclosure.
  • the signal quadrature unit described in the above embodiments may be implemented by a branch line bridge and a DSP, and may also be implemented by a signal quadrature device as shown in FIG. 17 .
  • the signal quadrature device 500 includes a logic circuit 501 and an input and output interface 502 .
  • the input/output interface 502 may be an independent input interface and an output interface, or may be a combined input/output interface.
  • the input and output interface 502 is used to receive the first input signal and the second input signal;
  • the logic circuit 501 is used to perform equal-amplitude quadrature synthesis output on the first input signal and the second input signal to obtain the first signal and the second signal ;
  • the input and output interface 502 is also used to output the first signal and the second signal.
  • the logic circuit 501 may be a central processing unit (central processing unit, CPU).
  • the central processing unit may further include a hardware chip.
  • the above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof.
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • the above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (generic array logic, GAL) or any combination thereof.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL general array logic
  • the input/output interface 502 may be an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the signal quadrature device 500 .
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the division of the unit is only for one logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be ignored, or not implement.
  • the shown or discussed mutual coupling, or direct coupling, or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of the present application are generated in whole or in part.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted over a computer-readable storage medium.
  • the computer instructions can be sent from one website site, computer, server, or data center to another by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.)
  • wire e.g. coaxial cable, fiber optic, digital subscriber line (DSL)
  • wireless e.g., infrared, wireless, microwave, etc.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media.
  • the available media may be read-only memory (ROM), or random access memory (RAM), or magnetic media, such as floppy disks, hard disks, magnetic tapes, magnetic disks, or optical media, such as , digital versatile disc (digital versatile disc, DVD), or semiconductor media, for example, solid state disk (solid state disk, SSD) and the like.
  • ROM read-only memory
  • RAM random access memory
  • magnetic media such as floppy disks, hard disks, magnetic tapes, magnetic disks, or optical media, such as , digital versatile disc (digital versatile disc, DVD), or semiconductor media, for example, solid state disk (solid state disk, SSD) and the like.

Landscapes

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

Abstract

La présente demande concerne une unité de multiplexage par répartition en fréquence, ainsi qu'un appareil et un procédé. L'unité de multiplexage par répartition en fréquence comprend un premier mélangeur de fréquence, un second mélangeur de fréquence, ainsi qu'une unité de synthèse de radiofréquence connectée au premier mélangeur de fréquence et au second mélangeur de fréquence. Le premier mélangeur de fréquence est utilisé pour mélanger un premier signal et un signal d'oscillateur local afin d'obtenir un premier signal de sortie, et le second mélangeur de fréquence est utilisé pour mélanger un second signal et le signal d'oscillateur local afin d'obtenir un second signal de sortie. De plus, l'unité de synthèse radiofréquence est utilisée pour synthétiser le premier signal de sortie et le second signal de sortie afin d'obtenir un signal synthétisé. Dans le signal synthétisé, un premier signal d'entrée et un second signal d'entrée sont situés respectivement dans différentes bandes latérales du signal d'oscillateur local. En utilisant le schéma de multiplexage par répartition en fréquence de la présente demande, le nombre de fréquences du signal d'oscillateur local est réduit, un grand nombre de combineurs et de filtres correspondant aux fréquences ne sont pas nécessaires, et la structure est simple.
PCT/CN2021/130370 2020-11-24 2021-11-12 Unité de multiplexage par répartition en fréquence, appareil et procédé WO2022111308A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202011335706.5A CN114553653A (zh) 2020-11-24 2020-11-24 频分复用单元、装置及方法
CN202011335706.5 2020-11-24

Publications (1)

Publication Number Publication Date
WO2022111308A1 true WO2022111308A1 (fr) 2022-06-02

Family

ID=81660616

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/130370 WO2022111308A1 (fr) 2020-11-24 2021-11-12 Unité de multiplexage par répartition en fréquence, appareil et procédé

Country Status (2)

Country Link
CN (1) CN114553653A (fr)
WO (1) WO2022111308A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120045023A1 (en) * 2010-08-18 2012-02-23 The Swatch Group Research And Development Ltd Low rate, direct conversion fsk radio-frequency signal receiver
CN202309620U (zh) * 2011-11-09 2012-07-04 成都创新达微波电子有限公司 一种低载漏单边带上变频器
CN104092473A (zh) * 2014-07-31 2014-10-08 中国科学院上海微系统与信息技术研究所 3mm波段接收机及其应用
CN110784179A (zh) * 2019-10-22 2020-02-11 北京信芯科技有限公司 一种双平衡fet混频器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120045023A1 (en) * 2010-08-18 2012-02-23 The Swatch Group Research And Development Ltd Low rate, direct conversion fsk radio-frequency signal receiver
CN202309620U (zh) * 2011-11-09 2012-07-04 成都创新达微波电子有限公司 一种低载漏单边带上变频器
CN104092473A (zh) * 2014-07-31 2014-10-08 中国科学院上海微系统与信息技术研究所 3mm波段接收机及其应用
CN110784179A (zh) * 2019-10-22 2020-02-11 北京信芯科技有限公司 一种双平衡fet混频器

Also Published As

Publication number Publication date
CN114553653A (zh) 2022-05-27

Similar Documents

Publication Publication Date Title
US9680556B2 (en) Narrowband signal transport sub-system for distributed antenna system
US10122476B2 (en) Radio unit with internal parallel antenna calibration
US10886612B2 (en) Bi-directional active phase shifting
WO2018098634A1 (fr) Émetteur-récepteur, station de base, et procédé de traitement de signal
US9294135B2 (en) Digital radio frequency (RF) receiver
WO2013024450A1 (fr) Récepteur
US20180167096A1 (en) Signal processing apparatus, method, and system
CN104798309A (zh) 多频带接收器及其信号处理方法
GB2501340A (en) A RF transceiver with switching means for bypassing at least one component of the transceiver
US8422539B2 (en) Multi-carrier receiver, multi-carrier transmitter and multi-carrier transceiver system
CN110661536A (zh) 星用半双工vdes系统多通道射频收发机
WO2016179799A1 (fr) Réseau à commande de phase à fréquence double
WO2022111308A1 (fr) Unité de multiplexage par répartition en fréquence, appareil et procédé
WO2017049902A1 (fr) Procédé de réception de signal radiofréquence double bande, et dispositif et station de base associés
US10014884B1 (en) Analog modulated repeater/transceiver
US11251822B1 (en) Software defined radio (SDR) filter relaxation technique for multiple-input and multiple-output (MIMO) and large antenna array (LAA) applications
WO2013018590A1 (fr) Appareil de communication sans fil
US20230155615A1 (en) Integrated high speed wireless transceiver
US9966902B2 (en) Multiple-band matching network for a Doherty power amplifier and amplifiers, transmitters, and base stations using the same
CN111654293B (zh) 中频信号处理装置及通信系统
WO2022074096A1 (fr) Système émetteur-récepteur à antennes multiples pour fonctionnement multibande
CN114846776B (zh) 无线通信装置及信号处理方法
CN111713034B (zh) 用于无线通信的发射机和接收机及相关联的方法
KR20220149722A (ko) 아날로그 빔 스티어링을 위한 방법 및 송신기
CN112929088A (zh) 中心单元、拉远单元、小站系统及通信方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21896809

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21896809

Country of ref document: EP

Kind code of ref document: A1