WO2018135853A1 - Procédé de transmission de signal de sortie, et système à antennes réparties pour la mise en œuvre de ce procédé - Google Patents

Procédé de transmission de signal de sortie, et système à antennes réparties pour la mise en œuvre de ce procédé Download PDF

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Publication number
WO2018135853A1
WO2018135853A1 PCT/KR2018/000797 KR2018000797W WO2018135853A1 WO 2018135853 A1 WO2018135853 A1 WO 2018135853A1 KR 2018000797 W KR2018000797 W KR 2018000797W WO 2018135853 A1 WO2018135853 A1 WO 2018135853A1
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Prior art keywords
signal
transceiver
reference clock
modem
transmission signal
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PCT/KR2018/000797
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English (en)
Korean (ko)
Inventor
정만영
양윤오
이상욱
임수환
황진엽
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엘지전자 주식회사
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Publication of WO2018135853A1 publication Critical patent/WO2018135853A1/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
    • 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
    • H04B1/401—Circuits for selecting or indicating operating mode
    • 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
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/405—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with multiple discrete channels

Definitions

  • the present invention relates to a distributed antenna system, and more particularly, to a method for transmitting an output signal using a distributed antenna system mounted on a vehicle.
  • LTE long term evolution
  • LTE-A LTE-Advanced
  • 5G 5G
  • the fifth generation (5G) mobile communication defined by the International Telecommunication Union (ITU), refers to data rates of up to 20 Gbps and at least 100 Mbps anywhere in the world. Its official name is 'IMT-2020' and aims to commercialize it globally in 2020.
  • ITU International Telecommunication Union
  • the ITU presents three usage scenarios, such as Enhanced Mobile BroadBand (eMBB), Massive Machine Type Communication (MMTC) and Ultra Reliable and Low Latency Communications (URLLC).
  • eMBB Enhanced Mobile BroadBand
  • MMTC Massive Machine Type Communication
  • URLLC Ultra Reliable and Low Latency Communications
  • URLLC relates to usage scenarios that require high reliability and low latency.
  • V2V vehicle to vehicle
  • D2D device to device
  • the distributed antenna system is an antenna system used to solve a high traffic capacity problem in an indoor environment by spatially distributing a low power antenna, and is a tower mounted amplifier (TMA) or remote radio head (RRH) applied to a conventional base station.
  • TMA tower mounted amplifier
  • RRH remote radio head
  • An object of the present disclosure is to provide a method for transmitting an output signal using a distributed antenna system for a vehicle.
  • the distributed antenna system includes a modem for generating a reference clock having a reference frequency and generating transmission signals having an intermediate frequency based on the reference clock; A first transceiver configured to generate a first output signal having an output frequency band by mixing a first transmission signal among the transmission signals and the reference clock; And a second transceiver configured to generate a second output signal having an output frequency band by mixing a second transmission signal and the reference clock among the transmission signals, wherein the first transceiver and the second transceiver are used.
  • a reference clock is provided from the modem and the output frequency band may be a millimeter wave band.
  • the modem includes: a baseband circuit for generating a reference clock having the reference frequency; A conversion circuit for converting a digital signal to be transmitted into an analog signal; A first antenna driver for receiving the reference clock and the analog signal and generating the first transmission signal; And a second antenna driver for receiving the reference clock and the analog signal and generating the second transmission signal, wherein the wireless transceiver, the first antenna driver and the second antenna driver are the same reference from the baseband circuit.
  • the clock can be received.
  • the first antenna driver When the insertion loss in the cable to which the first transmission signal and the second transmission signal are transmitted is not large, the first antenna driver generates the first transmission signal without changing the frequency of the analog signal, and the second The antenna driver may generate the second transmission signal without changing the frequency of the analog signal.
  • the modem and the first transceiver may be electrically connected through a first coaxial cable, and the modem and the second transceiver may be electrically connected through a second coaxial cable.
  • another disclosure of the present disclosure provides a method for transmitting an output signal by a distributed antenna system including a modem and a plurality of transceivers.
  • the method includes: generating, by the modem, a reference clock having one reference frequency; Generating, by the modem, a first transmission signal and a second transmission signal having an intermediate frequency based on the reference clock; Generating, by a first transceiver, a first output signal having an output frequency band by mixing the first transmission signal and the reference clock among the plurality of transceivers; And generating, by a second transceiver, a second output signal having an output frequency band by mixing the second transmission signal and the reference clock among the plurality of antennas, wherein the first transceiver and the second transmission / reception are performed.
  • the reference clock additionally used is provided from the modem, and the output frequency band may be a millimeter wave band.
  • 1 is a wireless communication system.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • D2D device to device
  • FIG. 4 illustrates an example of D2D communication or ProSe communication between UE # 1 and UE # 2 illustrated in FIG. 3.
  • 5 is an exemplary view illustrating the concept of V2X.
  • FIG. 6 is an exemplary view showing a conventional modem.
  • 8A and 8B illustrate a distributed antenna system according to an embodiment of the present specification.
  • FIG. 9 shows an example of frequency allocation according to an input port of the IF multiplexer shown in FIG. 8B.
  • 10A and 10B illustrate a distributed antenna system according to another embodiment of the present specification.
  • FIG. 11 is a block diagram illustrating a wireless communication system in which an embodiment presented in the present specification is implemented.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • base station which is used hereinafter, generally refers to a fixed station for communicating with a wireless device, and includes an evolved-nodeb (eNodeB), an evolved-nodeb (eNB), a base transceiver system (BTS), and an access point (e.g., a fixed station). Access Point) may be called.
  • eNodeB evolved-nodeb
  • eNB evolved-nodeb
  • BTS base transceiver system
  • access point e.g., a fixed station.
  • UE User Equipment
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • MT mobile terminal
  • 1 is a wireless communication system.
  • a wireless communication system includes at least one base station (BS) 20.
  • Each base station 20 provides a communication service for a particular geographic area (generally called a cell) 20a, 20b, 20c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the UE typically belongs to one cell, and the cell to which the UE belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are determined relatively based on the UE.
  • downlink means communication from the base station 20 to the UE 10
  • uplink means communication from the UE 10 to the base station 20.
  • the transmitter may be part of the base station 20 and the receiver may be part of the UE 10.
  • the transmitter may be part of the UE 10 and the receiver may be part of the base station 20.
  • a radio frame includes 10 subframes, and one subframe includes two slots. Slots in a radio frame are numbered from 0 to 19 slots.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI may be referred to as a scheduling unit for data transmission.
  • one radio frame may have a length of 10 ms
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • one slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols. How many OFDM symbols are included in one slot may vary depending on a cyclic prefix (CP).
  • OFDM orthogonal frequency division multiplexing
  • One slot includes N RB resource blocks (RBs) in the frequency domain.
  • N RB resource blocks For example, in the LTE system, the number of resource blocks (RBs), that is, N RBs may be any one of 6 to 110.
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
  • D2D communication expected to be introduced in the next generation communication system will be described below.
  • SNS social network services
  • UE # 1 100-1 As shown in FIG. 3 to reflect the above-described requirements, between UE # 1 100-1, UE # 2 100-2, UE # 3 100-3, or UE # 4 100-. 4), a method of allowing direct communication between the UE # 5 (100-5) and the UE # 6 (100-6) without the involvement of the base station (eNodeB) 200 has been discussed.
  • the UE # 1 100-1 and the UE # 4 100-4 may directly communicate with the help of the base station (eNodeB) 200.
  • the UE # 4 100-4 may serve as a repeater for the UE # 5 100-5 and the UE # 6 100-6.
  • the UE # 1 100-1 may serve as a relay for the UE # 2 100-2 and the UE # 3 100-3 that are far from the cell center.
  • D2D communication is also called proximity service (ProSe).
  • ProSe proximity service
  • the UE that performs the proximity service is also called a ProSe UE.
  • a link between UEs used for the D2D communication may be referred to as sidelink.
  • Physical channels used for the sidelinks are as follows.
  • PSSCH Physical Sidelink Shared Channel
  • PSCCH Physical Sidelink Control Channel
  • PSCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • DMRS Demodulation Reference Signal
  • SSS Sidelink Synchronization Signal
  • the SLSS includes a Primary Side Link Synchronization Signal (PSLSS) and a Secondary Side Link Synchronization Signal (Secondary SLSS: SSLSS).
  • PSLSS Primary Side Link Synchronization Signal
  • SSLSS Secondary Side Link Synchronization Signal
  • the base station 200 broadcasts a system information block (SIB) in a cell.
  • SIB system information block
  • the SIB may include information about a resource pool related to D2D communication.
  • Information about a resource pool associated with the D2D communication may be classified into SIB type 18 and SIB type 19.
  • the SIB type 18 may include resource configuration information for D2D communication.
  • the SIB type 19 may include resource configuration information related to D2D discovery.
  • the UE # 1 100-1 located within the coverage of the base station 200 establishes an RRC connection with the base station.
  • the UE # 1 100-1 receives an RRC message, for example, an RRC Connection Reconfiguration message, from the base station 200.
  • the RRC message includes a discovery configuration (hereinafter referred to as discConfig).
  • the discConfig includes configuration information on a discovery resource pool (hereinafter referred to as DiscResourcePool).
  • the UE # 1 100-1 detects whether a suitable UE exists in the vicinity for D2D communication or ProSe communication, or the UE # 1 100-1 indicates a presence of a detection signal, Discovery signal) may be transmitted through the PSDCH.
  • the UE # 1 100-1 may transmit a scheduling assignment (SA) through the PSCCH.
  • SA scheduling assignment
  • the UE # 1 100-1 may transmit a PSSCH including data based on the scheduling assignment SA.
  • V2X vehicle-to-everything
  • V2X may be a vehicle.
  • V2X may be referred to as vehicle-to-vehicle (V2V), and may mean communication between vehicles.
  • 5 is an exemplary view illustrating the concept of V2X.
  • vehicles ie, wireless devices mounted on vehicles
  • 100-1, 100-2, and 100-3 may communicate with each other.
  • V2X may mean a person or a pedestrian.
  • V2X may be expressed as vehicle-to-person or vehicle-to-pedestrian (V2P).
  • the pedestrian is not necessarily limited to a person walking on foot, and may include a person riding a bicycle, a driver or a passenger (less than a certain speed) of a vehicle.
  • V2X may be infrastructure / network.
  • V2X may be referred to as vehicle-to-infrastructure (V2I) or vehicle-to-network (V2N), and may mean communication between a vehicle and a roadside unit (RSU) or a vehicle and a network.
  • the roadside device may be a traffic related infrastructure, for example, a device for indicating speed.
  • the roadside device may be implemented in a base station or a fixed terminal.
  • FIG. 6 is an exemplary view showing a conventional modem.
  • a conventional modem may include a baseband (BB) circuit, an RF transceiver, and an RF front end.
  • BB baseband
  • the baseband circuit may modulate the transmission data through digital signal processing, and demodulate the reception signal to restore the reception data.
  • the RF transceiver includes a mixer, an analog-to-digital converter (ADC), and a digital-to-analog converter (DAC), wherein the RF transceiver includes an analog signal between the baseband circuit and the RF front end.
  • the reception signal) can be converted into a digital signal
  • the digital signal (transmission signal) can be converted into an analog signal.
  • the RF front end may include a power amplifier (PA), a low noise amplifier (LNA), a duplexer, and a filter that are not integrated in the RF transceiver.
  • PA power amplifier
  • LNA low noise amplifier
  • duplexer a filter that are not integrated in the RF transceiver.
  • the baseband circuit and the RF transceiver may transmit and receive digital signals to each other according to a dedicated signal protocol of a chipset manufacturer.
  • TMA tower mounted amplifier
  • RRH remote radio head
  • the insertion loss of the RF cable increases as the transmission frequency increases. Therefore, when building a distributed antenna system in the high frequency band, the insertion loss of the RF cable increases, antenna performance may be reduced, and antenna construction cost may increase.
  • the application of higher frequencies increases RF cables and increases implementation costs by requiring multiple RF cables (Tx / Rx) for each distributed antenna. Complemented reception, but performance degradation still occurs due to increased RF cable insertion loss RF transceiver distribution Prize medium Prize Terminal chipset manufacturers need to implement dedicated RF transceivers for distributed antenna systems Modem distributed medium Prize Ha
  • Each distributed antenna is composed of independent modems, and each modem is implemented in the form of combining the received data at a higher layer. Therefore, consideration of related functions and charging schemes in the network is necessary.
  • the insertion loss of the RF cable increases in proportion to the frequency, and accordingly, an increase in the cost of using an expensive RF cable may be a problem.
  • an RF antenna distribution method or an RF front end distribution method may be appropriate due to performance degradation and cost increase due to insertion loss of an RF cable. I can't.
  • the distributed antenna system of the RF transceiver distributed method transmits a digital signal directly to the distributed antenna, the distributed antenna can generate an analog signal itself.
  • performance may be degraded due to the frequency offset of each oscillator, and in particular, the number of distributed antennas As the value increases, the range of performance degradation may increase.
  • a distributed antenna since a distributed antenna includes a plurality of different modems embedded therein and combines the transmit / receive data of each modem in an upper layer, Measures to deal with (eg, dedicated server installation, etc.) may be required.
  • Measures to deal with eg, dedicated server installation, etc.
  • the modem distributed scheme only the gain due to selective combining occurs in terms of performance. Therefore, considering the cost and performance, the modem distributed scheme may not be an appropriate scheme.
  • a distributed antenna system of the following type is proposed. According to the method proposed in the present disclosure, while using a conventional modem composed of a baseband circuit and an RF transceiver as it is possible, the distributed antenna by changing the output frequency of the RF transceiver to an intermediate frequency band, which is advantageous for analog signal transmission Each of the distributed antennas may be finally converted to a transmission / reception frequency and then transmitted.
  • FIG. 8A and 8B illustrate a distributed antenna system according to an exemplary embodiment of the present disclosure
  • FIG. 9 illustrates an example of frequency allocation according to an input port of an IF multiplexer illustrated in FIG. 8B.
  • FIG. 8A illustrates a modem included in a distributed antenna system implemented in a frequency-division duplex (FDD) scheme
  • FIG. 8B illustrates an antenna unit included in a distributed antenna system implemented in a FDD scheme.
  • the distributed antenna system illustrated in FIGS. 8A and 8B may be a distributed antenna system for a vehicle.
  • Part A and B shown in FIG. 8A may be physically / functionally connected to part A and B shown in FIG. 8B, respectively.
  • f_ref The output frequency of the voltage-controlled crystal oscillator controlled by the modem's automatic frequency controller (AFC), which can be sent to the RF transceiver, antenna driver, and RF front end to be used as the reference frequency for the RF transceiver, antenna driver, and RF front end.
  • AFC automatic frequency controller
  • f_IF_U / f_IF_D A frequency of an intermediate frequency band for transmitting a UL / DL signal in a cable (eg, a coaxial cable), and may be selected in consideration of the attenuation characteristics of the analog filter of the cable and the IF multiplexer.
  • f_CU / f_CD UL / DL carrier frequency used for an output signal transmitted and received by a terminal to a base station
  • f_PLL_U2 / F_PLL_D2 In the IF multiplexer of the RF transceiver, the PLL of the RF front-end generates the RF front end based on the reference frequency (f_ref) to convert the frequency of the transmitted signal transmitted over the cable to the UL / DL carrier frequency f_CU / f_CD. As the frequency of the signal, it can be sent to the mixer.
  • the following equation may be established between f_PLL_U2 / F_PLL_D2 and f_IF_U / f_IF_D.
  • f_tmp_U / f_tmp_D A frequency of a UL / DL analog signal generated by an RF transceiver of a modem, and may be a frequency having good characteristics among frequency bands supported by the RF transceiver.
  • the antenna driver transmits a signal generated by the RF transceiver to the RF front end through a cable without changing the frequency using a mixer, the following equation may be established.
  • f_PLL_U1 / f_PLL_D1 This may be a frequency generated by the PLL of the antenna driver and transmitted to the mixer. It is used to change the frequency of the analog signal received from the RF transceiver to the intermediate frequency band, the following equation can be established.
  • a distributed antenna system may include a modem and a plurality of RF front ends.
  • the modem may include a baseband circuit (BB), a voltage controlled crystal oscillator (VCXO), a control signal generator, an RF transceiver, and a plurality of antenna drivers.
  • BB baseband circuit
  • VXO voltage controlled crystal oscillator
  • control signal generator an RF transceiver
  • the baseband circuit BB may modulate the transmission data through digital signal processing, and demodulate the reception signal to restore the reception data.
  • the baseband circuit BB may control the reference clock output from the voltage controlled crystal oscillator VXO using the AFC.
  • the voltage controlled crystal oscillator VCXO may adjust the frequency f_ref of the reference clock CLK_ref under the control of the baseband circuit BB.
  • the voltage controlled crystal oscillator VCXO may transmit the reference clock CLK_ref to an RF transceiver and a plurality of antenna drivers.
  • the reference frequency f_ref of the reference clock CLK_ref may be controlled by an automatic frequency controller (AFC) of the modem.
  • the reference clock CLK_ref may be transmitted to the RF front end through a cable without changing the frequency.
  • the RF transceiver may receive a digital signal from a baseband circuit BB, convert it into an analog signal, and convert an analog signal transmitted through the plurality of antenna drivers into a digital signal.
  • the RF transceiver may transmit a first transmission signal generated by converting a digital signal from a baseband circuit BB to a first antenna driver, and transmit a second transmission signal to a second antenna driver.
  • the plurality of antenna drivers may be connected to a plurality of RF front ends via a cable.
  • Each of the plurality of antenna drivers may include a phase locked loop (PLL), a mixer, and an IF multiplexer.
  • PLL phase locked loop
  • the frequency of the transmission signal transmitted by the plurality of antenna drivers to the RF front end via a cable may be an intermediate frequency band.
  • the intermediate frequency band may be determined in consideration of the required frequency band and frequency, attenuation characteristics, and the implementation complexity of the multiplexer in the entire system, and the intermediate frequency band takes the necessary frequency band and frequency, the attenuation characteristic, and the implementation complexity of the multiplexer in the entire system into consideration.
  • the resultant frequency may be the lowest frequency band.
  • the PLL may receive a reference clock from a voltage controlled crystal oscillator (VCXO) and tune the received reference clock.
  • VXO voltage controlled crystal oscillator
  • the mixer may mix the transmission signal (first transmission signal or second transmission signal) received from the RF transceiver with the tuned reference clock received from the PLL.
  • the IF multiplexer may receive a control signal, a transmission signal (a first transmission signal or a second transmission signal), a reference clock, and a direct current power supply (DC), and transmit the received signal received through a cable to an RF transceiver.
  • the IF multiplexer can pass a reference clock with a reference frequency (f_ref) through the cable to the RF front end.
  • the reference frequency f_ref may be a frequency band of 20 MHz or less.
  • each of the RF front ends may have a different reference frequency (that is, each of the antenna drivers to generate a reference clock independently)
  • each of the RF front ends may have a different frequency offset (offset).
  • offset a performance degradation may occur due to different frequency offsets, and thus, the method proposed in this specification may be caused by having a different reference frequency for each RF front end as in the RF transceiver distribution method described in Table 1 above. This can compensate for any performance degradation.
  • the IF multiplexer refers to a duplexer, quadplexer or hexaplexer, and may be configured by combining a plurality of band pass filters.
  • the transmitted signal can be converted to an intermediate frequency band and transmitted to the RF front end via a cable.
  • the cable may be a coaxial cable.
  • the control signal generator may generate a control signal Ctrl according to the control of the baseband circuit BB.
  • the control signal generator may transmit the generated control signal Ctrl to the antenna driver.
  • the control signal Ctrl may be transmitted to the antenna driver through a digital cable separate from the cable. Considering the distance from the modem to the antenna and the number of cables, serial control may be advantageous for the control signal Ctrl.
  • a separate signal conversion technique may be required to exclude that the control signal Ctrl, which is a digital signal, affects the transmission / reception signal, which is an analog signal.
  • the signal conversion technique may be a combination of Manchester coding and a band-limited filter.
  • DC power may be transmitted separately from the cable, or may be transmitted through the cable.
  • the method of transmitting the DC power source DC may be determined in consideration of the cost of implementing the multiplexer port required for transmitting the DC power source DC.
  • the DC power DC may be separated from the transmitted / received signal by using a low pass filter LPT at the end.
  • the antenna driver may transmit to the RF front end without changing the frequency of the transmission signal received from the RF transceiver. That is, if the frequency of the transmission signal transmitted by the antenna driver to the RF front end through the cable corresponds to the lowest frequency band among the frequencies supported by the RF transceiver, the antenna driver may turn on the mixer if the loss in the cable is not large.
  • the transmission signal can be transmitted to the antenna circuit without mixing the reference signal and the transmission signal output from the RF transceiver. This can reduce implementation costs.
  • the antenna driver can transmit the transmission signal to the RF front end without omitting the mixing of the transmission signal using the mixer and the PLL.
  • Each of the plurality of RF front ends may include an IF multiplexer, a PLL, a micro controller unit (MCU), a power amplifier (PA), a low-noise amplifier (LNA), a mixer, and an RF duplexer.
  • MCU micro controller unit
  • PA power amplifier
  • LNA low-noise amplifier
  • the RF front end can be connected to the antenna driver via a cable.
  • the RF front end may convert the frequency of the transmission signal received from the antenna driver to generate an output signal, and transmit the output signal through the antenna.
  • the output signal may be mm wave.
  • the IF multiplexer at the RF front end can receive transmit signals, reference clocks, control signals, and direct current power from the antenna driver, and receive signals through the antenna.
  • the IF multiplexer may transmit a transmission signal received from the antenna driver to the mixer, transmit a reference clock to the PLL, transmit a control signal to the MCU, and transmit the received signal to the antenna driver through a cable.
  • the PLL of the RF front end may have the same function as the PLL of the antenna driver.
  • the mixer at the RF front end may mix the reference clock and the transmitted signal and transmit it to the PA.
  • the PA may amplify the mixed signal to generate an output signal (carrier).
  • the LNA can amplify the received signal received by the antenna.
  • the distributed antenna system described with reference to FIGS. 8A and 8B minimizes a change in the configuration of a modem composed of a conventional baseband circuit and an RF transceiver, and converts the frequency of the output of the RF transceiver into an intermediate frequency band for analog signal transmission. Can change and send.
  • Distributed antennas may transmit the frequency of the output of the RF transceiver having an intermediate frequency band to a frequency capable of transmitting and receiving.
  • 10A and 10B illustrate a distributed antenna system according to another embodiment of the present specification.
  • FIGS. 10A and 10B illustrate a distributed antenna system implemented in a time-division duplex (TDD) scheme, unlike FIGS. 8A and 8B. That is, FIG. 10A illustrates a modem included in a distributed antenna system implemented in a TDD scheme, and FIG. 10B illustrates an antenna unit included in a distributed antenna system implemented in a TDD scheme. According to an embodiment, the distributed antenna system illustrated in FIGS. 10A and 10B may be a distributed antenna system for a vehicle.
  • TDD time-division duplex
  • the modem of the distributed antenna system implemented by the TDD scheme may have the same configuration and function as the modem of the distributed antenna system implemented by the FDD scheme illustrated in FIG. 8A.
  • an RF duplexer is used in the distributed antenna system implemented in the FDD scheme illustrated in FIG. 8B, but an RF switch is used in the distributed antenna system implemented in the TDD scheme illustrated in FIG. 10B.
  • the antenna unit of 10b may have the same configuration and function as the antenna unit of FIG. 8B.
  • the antenna unit shown in FIG. 8B since the antenna unit shown in FIG. 8B is operated in the FDD scheme, a duplexer is required to distinguish transmission and reception signals transmitted and received at the same time.
  • the antenna unit shown in FIG. RF switches that are switched may be required. Therefore, instead of the RF duplexer of the antenna unit of the FDD scheme shown in FIG. 8B, only the part in which the antenna unit of the TDD scheme illustrated in FIG. 10B includes an RF switch may be different.
  • Part A and B shown in FIG. 10A may be physically / functionally connected to part A and B shown in FIG. 10B, respectively.
  • FIG. 11 is a block diagram illustrating a wireless communication system in which an embodiment presented in the present specification is implemented.
  • the base station 200 includes a processor 201, a memory 202, and an RF unit 203.
  • the memory 202 is connected to the processor 201 and stores various information for driving the processor 201.
  • the RF unit 203 is connected to the processor 201 to transmit and / or receive a radio signal.
  • the processor 201 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 51.
  • the terminal 100 includes a processor 101, a memory 102, and an RF unit 103.
  • the memory 102 is connected to the processor 101 and stores various information for driving the processor 101.
  • the RF unit 103 is connected to the processor 101 and transmits and / or receives a radio signal.
  • the processor 101 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the wireless device may be implemented by the processor 101.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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Abstract

La présente invention concerne un système à antennes réparties. Le système à antennes réparties comprend : un modem pour générer une horloge de référence ayant une fréquence de référence et transmettre, sur la base de l'horloge de référence, des signaux de transmission ayant une bande de fréquences intermédiaires ; et des émetteurs-récepteurs pour générer un signal de sortie, ayant une bande de fréquences de sortie, en mélangeant les signaux de transmission avec l'horloge de référence, l'horloge de référence utilisée par les émetteurs-récepteurs étant fournie depuis le du modem, et la bande de fréquences de sortie pouvant être une bande d'ondes millimétriques.
PCT/KR2018/000797 2017-01-20 2018-01-17 Procédé de transmission de signal de sortie, et système à antennes réparties pour la mise en œuvre de ce procédé WO2018135853A1 (fr)

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US10887017B2 (en) 2019-02-23 2021-01-05 Zinwave, Ltd. Multi-range communication system
US11557842B2 (en) 2020-05-04 2023-01-17 Samsung Electronics Co., Ltd. Antenna module and electronic device using the same

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US20070259642A1 (en) * 2006-05-05 2007-11-08 Rajasekhar Pullela System and method for generating local oscillator (LO) signals for a quadrature mixer
KR20080098110A (ko) * 2007-05-04 2008-11-07 에스케이텔레시스 주식회사 Ｔｄｄ 방식의 이동통신용 송수신신호 변환장치
KR20100106566A (ko) * 2008-01-07 2010-10-01 퀄컴 인코포레이티드 저 잡음 및 저 변환 손실을 갖는 직교 무선 주파수 믹서
KR20140006043A (ko) * 2011-02-17 2014-01-15 고쿠리츠다이가쿠호진 토쿄고교 다이가꾸 밀리미터파 대역 무선 송수신 장치

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US6078790A (en) * 1996-04-25 2000-06-20 Samsung Electronics Co., Ltd. Radio frequency generator for a radio communication system
US20070259642A1 (en) * 2006-05-05 2007-11-08 Rajasekhar Pullela System and method for generating local oscillator (LO) signals for a quadrature mixer
KR20080098110A (ko) * 2007-05-04 2008-11-07 에스케이텔레시스 주식회사 Ｔｄｄ 방식의 이동통신용 송수신신호 변환장치
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10887017B2 (en) 2019-02-23 2021-01-05 Zinwave, Ltd. Multi-range communication system
US11368221B2 (en) 2019-02-23 2022-06-21 Zinwave, Ltd Multi-range communication system
US11557842B2 (en) 2020-05-04 2023-01-17 Samsung Electronics Co., Ltd. Antenna module and electronic device using the same

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