WO2016072533A1 - Procédé et appareil pour recevoir un signal dans un système d'accès sans fil prenant en charge une transmission radio duplex (fdr) - Google Patents

Procédé et appareil pour recevoir un signal dans un système d'accès sans fil prenant en charge une transmission radio duplex (fdr) Download PDF

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Publication number
WO2016072533A1
WO2016072533A1 PCT/KR2014/010518 KR2014010518W WO2016072533A1 WO 2016072533 A1 WO2016072533 A1 WO 2016072533A1 KR 2014010518 W KR2014010518 W KR 2014010518W WO 2016072533 A1 WO2016072533 A1 WO 2016072533A1
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matrix
interference
signal
transmission
transmitted
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PCT/KR2014/010518
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English (en)
Korean (ko)
Inventor
김진민
나현종
이충용
정재훈
Original Assignee
엘지전자 주식회사
연세대학교
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Priority to PCT/KR2014/010518 priority Critical patent/WO2016072533A1/fr
Priority to KR1020177011256A priority patent/KR102284370B1/ko
Publication of WO2016072533A1 publication Critical patent/WO2016072533A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

Definitions

  • the present invention relates to a wireless access system that supports a full duplex radio (FDR) transmission environment, and more particularly, to a method for efficiently receiving a signal by removing magnetic interference generated when applying an FDR, and an apparatus for supporting the same.
  • FDR full duplex radio
  • Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless access system is a multiple access system that can support communication with multiple users by sharing all available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (0FDMA) systems, and SC—FDMA (single carrier). frequency division multiple access) systems.
  • An object of the present invention is to provide a method for efficiently transmitting and receiving data in a wireless access system supporting FDR transmission.
  • Another object of the present invention is to provide an apparatus supporting these methods.
  • a method of removing interference from a signal received by a first device from a second device in a wireless access system supporting FDRCFull Duplex Radio transmission according to an embodiment of the present invention,
  • the matrix H for the channel between the transmit and receive antennas of the first device and the first device transmit to the second device.
  • removing the magnetic interference from the transmission signal s from the circuit signal received from the second device using the reception filter matrix G
  • An apparatus for eliminating interference in a radio access system supporting FDR (Ful Duplex Radio) transmission includes an RF Radio Frequency (RF Radio Frequency) unit; And a processor, wherein the processor is further configured to multiply the matrix H for the channel between the transmit antenna and the receive antenna of the first device by the transmit signal s transmitted by the first device to the second device, and thereby the effective interference matrix Hs. And generate a reception filter matrix G using a null-space basis vector among the left singular vectors included in the effective interference matrix Hs, and receive the received filter matrix G from the second device using the reception filter matrix G.
  • the signal may be configured to remove magnetic interference from the signal s.
  • ui may represent the left singular vector
  • u2 to uNr may represent the base vector forming the null-space.
  • reception filter matrix G may be expressed by the following equation.
  • the effective interference matrix Hs may use only one resource space.
  • the left, in particular, the vector may be generated by using a Single Value Decomposit ion (SVD) operation.
  • SVD Single Value Decomposit ion
  • the first device may simultaneously receive the desired signal received from the second device and the transmission signal transmitted by the first device to the second device.
  • FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system.
  • FIG. 2 illustrates a structure of a control plane and a user plane of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • 3 illustrates physical channels used in a 3GPP system and a general signal transmission method using the same.
  • FIG. 4 illustrates a structure of a radio frame used in an LTE system.
  • FIG. 5 illustrates a structure of a downlink radio frame used in an LTE system.
  • FIG. 6 illustrates a structure of an uplink subframe used in an LTE system.
  • FIG. 7 illustrates a configuration of a general multiple antenna (MIM0) communication system.
  • FIG. 10 is a diagram illustrating an example of an interference situation in an FDR scheme.
  • FIG. 11 is a flowchart illustrating a method of canceling magnetic interference in an FDR system according to the present invention.
  • FIG. 12 is a graph illustrating channel capacities of the proposed technique and the null-space projection technique of the present invention.
  • FIG. 13 illustrates a first device and a second device that may be applied to an embodiment of the present invention.
  • each component or feature may be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
  • the base station has a meaning as a terminal node of the network that directly communicates with the terminal. Certain operations described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
  • BS base station
  • eNB eNode B
  • AP access point
  • RN relay node
  • RS relay station
  • terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and an SSCSubscriber Station (MSS).
  • UE user equipment
  • MS mobile station
  • MSS mobile subscriber station
  • MSS SSCSubscriber Station
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, the present invention among the embodiments of the present invention Steps or portions not described in order to clearly reveal the technical idea of the title may be supported by the above documents. In addition, all terms disclosed in this document can be described by the above standard document.
  • CDMA Code Division Multiple Access FDMA
  • Frequency Division Multiple Access FDMA
  • Time Division Multiple Access TDMA
  • Orthogonal Frequency Division Multiple Access OFDMA
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • CDMA may be implemented by radio technologies such as UTRA Jniversal Terrestrial Radio Access (CDMA2000) or CDMA2000.
  • TDMA may be implemented in a wireless technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile Communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like.
  • UTRA is part of UMTSOJniversal Mobile Telecommunications System.
  • 3GPP LTEdong term evolution (3GPP) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FOMA in uplink.
  • LTE-A Advanced is an evolution of 3GPP LTE.
  • WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
  • IEEE 802.16e WiMA-OFDMA Reference System
  • advanced IEEE 802.16m WiMA-OFDMA Advanced system
  • a structure of a downlink radio frame will be described with reference to FIG. 1.
  • uplink / downlink data packet transmission is performed in subframe units, and one subframe is defined as a predetermined time interval including a plurality of 0FDM symbols.
  • the 3GPP LTE standard supports a type 1 radio frame structure applicable to FDE Frequency Division Duplex (FDE) and a type 2 radio frame structure applicable to TDD (Time Division Duplex).
  • FIG. 1 is a diagram illustrating a structure of a type 1 radio frame.
  • the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
  • TTH transmission time interval Single The time it takes for a subframe to be transmitted is called a TTH transmission time interval, for example, the length of one subframe may be 1 ms, and the length of one slot may be 0.5 ms.
  • OFDM symbol and includes a plurality of resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • OFDM symbols represents one symbol period.
  • OFDM symbols may also be referred to as SC-FDMA symbols or symbol intervals.
  • a resource block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot.
  • the number of 0FOM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
  • CPs include extended CPs and normal CPC normal CPs.
  • the number of OFDM symbols included in one slot may be seven.
  • the OFDM symbol is configured by the extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP.
  • the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the terminal moves at a high speed, an extended CP may be used to further reduce inter-symbol interference.
  • one slot When a general CP is used, one slot includes 7 OFDM symbols, and thus, one subframe includes 14 OFDM symbols.
  • the first two or three 0FDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slot may vary.
  • the downlink slot includes a plurality of 0FDM symbols in the time domain and includes a plurality of resource blocks in the frequency domain.
  • one downlink slot includes 70 FDM symbols, and one resource block includes 12 subcarriers as an example, but is not limited thereto.
  • Each element on the resource grid It is called cattle (RE).
  • the resource element a (k, l) becomes a resource element located in the k th subcarrier and the 1 st OFDM symbol.
  • one resource block includes 12 X 7 resource elements (in the case of an extended CP, it includes 12 X 6 resource elements). Since the interval of each subcarrier is 15 kHz, one resource block includes about 180 kHz in the frequency domain.
  • NDL is the number of resource blocks included in a downlink slot. The value of NDL may be determined according to a downlink transmission bandwidth set by scheduling of a base station.
  • FIG. 3 illustrates a structure of a downlink subframe.
  • Up to three OFDM symbols in the front part of the first slot in one subframe correspond to a control region to which a control channel is allocated.
  • the remaining OFDM symbols correspond to data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated.
  • the basic unit of transmission is one subframe. That is, PDCCH and PDSCH are allocated over two slots.
  • Downlink control channels used in the 3GPP LTE system include, for example, a physical control format indicator channel (PCFICH), a physical downlink ink control channel (PDCCH), and a physical HARQ.
  • Indicator channel Physical Hybrid Automat ic repeat request Indicator Channel; PHICH).
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and includes information on the number of OFDM symbols used for control channel transmission in the subframe.
  • PHICH includes HARQ ACK / NACK signal as a male answer of uplink transmission.
  • Control information transmitted through the PDCCH is called Downlink Control Information (DCI).
  • DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
  • PDCCH includes resource allocation and transmission format of DL shared channel (DL-SCH), resource allocation information of UL shared channel (UL-SCH), paging information of paging channel (PCH), system information on DL-SCH and PDSCH.
  • Resource allocation of upper layer control messages such as random access response transmitted to the network, a set of transmit power control commands for individual terminals in a certain terminal group, transmission power control information, activation of VoIP voice over IP), and the like. It may include.
  • a plurality of PDCCHs may be transmitted in the control region.
  • the UE may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted in a combination of one or more consecutive Control Channel Elements (CCEs).
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on the state of a radio channel.
  • CCE has multiple chairs Corresponds to the original element group.
  • the format of the PDCGH and the number of available bits are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCi transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
  • CRC is masked with an identifier called Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific UE, the cell-RNTI (C-RNTI) identifier of the UE may be masked to the CRC.
  • RNTI Radio Network Temporary Identifier
  • a paging indicator identifier may be masked to the CRC.
  • the PDCCH is for system information (more specifically, system information block (SIB))
  • the system information identifier and system information RNTKSI-RNTI may be masked to the CC.
  • Random Access -RNTI (RA-RNTI) may be masked to the CRC to indicate a random access answer that is a response to the transmission of the random access preamble of the UE.
  • the uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) including uplink control information is allocated to the control region.
  • a physical uplink shared channel (PUSCH) including user data is allocated.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • one UE does not simultaneously transmit a PUCCH and a PUSCH.
  • PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • MIM0 Multiple Input Multiple Output
  • MIM0 technology does not rely on a single antenna path to receive an entire message.
  • the entire data can be received by combining a plurality of data pieces received through a plurality of antennas.
  • the MIM0 technology includes a spatial diversity technique and a spatial multiplexing technique.
  • Spatial diversity schemes can be diversified but gain can increase transmission reliability or widen the cell radius. It is suitable for data transmission to a terminal moving at high speed.
  • Spatial multiplexing can increase the data rate without increasing the bandwidth of the system by simultaneously transmitting different data.
  • FIG. 5 is a configuration diagram of a wireless communication system having multiple antennas.
  • the theoretical channel is proportional to the number of antennas, unlike when the transmitter or receiver uses multiple antennas.
  • the transmission capacity is increased. Therefore, the transmission rate can be improved and the frequency efficiency can be significantly improved.
  • the transmission rate can theoretically increase as the rate 10 increase rate Ri multiplied by the maximum transmission rate Ro when using a single antenna.
  • the transmission information when there are NT transmission antennas, the maximum information that can be transmitted is NT.
  • the transmission information may be expressed as follows.
  • Each transmission information ⁇ 2: ⁇ ⁇ may have different transmission power. If each transmission power is r i, '' , the transmission information whose transmission power is adjusted may be expressed as follows.
  • ⁇ 2 ⁇ can be expressed using the vector X as
  • W is also called a precoding matrix.
  • the transmission signal X may be considered in different ways depending on two cases (for example, spatial diversity and spatial multiplexing).
  • spatial multiplexing different signals are multiplexed and the multiplexed signal is sent to the receiving side so that the elements of the information vector (s) have different values.
  • spatial diversity the same signal is plural Are repeatedly transmitted through two channel paths, so that elements of the information vector (s) have the same value.
  • a combination of spatial multiplexing and spatial diversity techniques can also be considered. That is, the same signal may be transmitted through, for example, three transmit antennas according to a spatial diversity scheme, and the remaining signals may be spatially multiplexed and transmitted to the receiver.
  • the reception signal, ⁇ po, ⁇ of each antenna may be expressed as a vector as follows.
  • channels may be classified according to transmit / receive antenna indexes.
  • the channel passing through the receiving antenna i from the transmitting antenna j will be denoted by. Note that in the order of the index, the receiving antenna index is first, and the index of the transmitting antenna is later.
  • FIG. 5 (b) shows a channel from NT transmit antennas to receive antenna i.
  • the channels may be bundled and displayed in the form of a vector and a matrix.
  • a channel arriving from a total of NT transmit antennas to a receive antenna i may be represented as follows.
  • all channels arriving from the NT transmit antennas to the NR receive antennas may be expressed as follows.
  • the received signal may be expressed as follows. -[86] [Equation 10]
  • the number of rows and columns of the channel matrix H indicating the channel state is determined by the number of transmit and receive antennas.
  • the number of rows in the channel matrix H is equal to the number of receive antennas NR, and the number of columns is equal to the number NT of transmit antennas. That is, the channel matrix H is RXNT matrix.
  • the rank of a matrix is defined as the minimum number of rows or columns that are independent of each other. Therefore, the rank of a matrix cannot be greater than the number of rows or columns.
  • the tank ra " A: (H) of the channel matrix H is limited as follows.
  • 'Rank' represents the number of paths that can independently transmit a signal
  • 'Number of layers' represents the number of signal streams transmitted through each path.
  • the transmitting end transmits a number of layers corresponding to the number of tanks used for signal transmission, unless otherwise specified, a tank has the same meaning as the number of layers.
  • a signal When a packet is transmitted in a wireless communication system, a signal may be distorted during the transmission process because the transmitted packet is transmitted through a wireless channel. In order to directly receive the distorted signal from the receiver, distortion of the received signal must be corrected using the channel information. In order to find out the channel information, a signal known to both the transmitting side and the receiving side is transmitted, and a method of finding the channel information with a distortion degree when the signal is received through the channel is mainly used. The signal is called a pilot signal or a reference signal. In case of transmitting / receiving data using multiple antennas, it is necessary to know the channel condition between each transmitting antenna and the receiving antenna to receive the correct signal. Therefore, a separate reference signal must exist for each transmit antenna.
  • RSs can be classified into two types according to their purpose.
  • One is RS used for channel information acquisition, and the other is RS used for data demodulation. Since the former is an RS for allowing the terminal to acquire downlink channel information, it should be transmitted over a wide band, and even if the terminal does not receive downlink data in a specific subframe, it should be able to receive and measure the corresponding RS.
  • Such RS is also used for measurement such as handover.
  • the latter is an RS that is transmitted together with the corresponding resource when the base station transmits a downlink, and the terminal can estimate the channel by receiving the corresponding RS, and thus can demodulate the data. This RS should be transmitted in the area where data is transmitted.
  • 3GPP LTE Long Term Evolution
  • DRS dedicated RS
  • the CRS is used for measurement of channel state information, measurement for handover, and the like, and may be referred to as cell-specific RS.
  • the DRS is used for data demodulation and may be called UE-specific RS.
  • DRS is used only for data demodulation, and CRS can be used for two purposes of channel information acquisition and data demodulation.
  • the CRS is a cell-specific RS, and is transmitted every subframe for a wideband.
  • the CRS may be transmitted for up to four antenna ports according to the number of transmit antennas of the base station. For example, if the number of transmitting antennas of the base station is two, CRSs for antenna ports 0 and 1 are transmitted, and if four, CRSs for antenna ports 0 to 3 are transmitted.
  • FIG. 6 shows patterns of CRS and DRS on one resource block (12 subcarriers on 14 OFDM symbols X frequencies in time in case of a normal CP) in a system in which a base station supports four transmit antennas.
  • resource elements RE denoted by 'R0', 'R1', 'R2' and 'R3' indicate positions of CRSs for antenna port indexes 0, 1, 2, and 3, respectively.
  • the resource element denoted as 'D' in FIG. 6 indicates the position of the DRS defined in the LTE system.
  • Evolution of the LTE System In an advanced LTE-A system, up to eight transmit antennas can be supported in downlink. Therefore, RS for up to eight transmit antennas should also be supported.
  • the downlink RS in the LTE system is defined for up to four antenna ports only, if the base station has four or more up to eight downlink transmit antennas in the LTE-A system, the RS for these antenna ports is additionally added. Should be defined. As RS for up to eight transmit antenna ports, both RS for channel measurement and RS for data demodulation shall be considered.
  • Backward compatibility means that the existing LTE terminal supports to operate properly in LTE-A system.
  • RS overhead is excessive when CRS defined in the LTE standard adds RS for up to eight transmit antenna ports in the time-frequency domain transmitted in every subframe over the entire band. It becomes bigger. Therefore, in designing RS for up to 8 antenna ports, consideration should be given to reducing RS overhead.
  • RS newly introduced in LTE-A system can be classified into two types. One of them is RS, which is a RS for channel measurement for selection of a transmission tank, modulation ion and coding scheme (MCS), precoding matrix index (PMI), etc. Channel State Informat ion RS (CSI-RS), and the other is a demodulation-reference signal (DM RS) for demodulating data transmitted through up to eight transmit antennas.
  • MCS modulation ion and coding scheme
  • PMI precoding matrix index
  • CSI-RS Channel State Informat ion RS
  • DM RS demodulation-reference signal
  • CSI-RS for channel measurement is designed for channel measurement-oriented purposes, whereas CRS in the existing LTE system is used for data demodulation at the same time as channel measurement, handover, etc. There is a characteristic.
  • CSI-RS can also be used for the purpose of measuring the handover.
  • CSI—RS is transmitted only for the purpose of obtaining information about channel status, so unlike CRS in the existing LTE system, it does not need to be transmitted every subframe.
  • the CSI-RS may be designed to be transmitted intermittently (eg, periodically) on the time axis.
  • a DM RS is transmitted to the terminal to which data transmission is scheduled (dedi cated).
  • the horse-only DM RS may be designed such that the terminal is transmitted only in the scheduled resource region, that is, the time at which data is transmitted for the terminal—frequency region.
  • FIG. 7 is a diagram illustrating an example of a DM RS pattern defined in an LTE-A system.
  • a position of a resource element for transmitting a DM RS on one resource block (12 subcarriers on 14 OFDM symbols X frequencies in time in case of a normal CP) in which downlink data is transmitted is shown.
  • the DM RS may be transmitted for four antenna ports (antenna port indexes 7, 8, 9, and 10) which are additionally defined in the LTE-A system.
  • DM RSs for different antenna ports may be distinguished by being located in different frequency resources (subcarriers) and / or different time resources (OFDM symbols) (ie, may be multiplexed in FDM and / or TDM schemes).
  • DM RSs for different antenna ports located on the same time-frequency resource may be distinguished from each other by orthogonal codes (i.e., may be multiplexed by the CDM scheme).
  • DM RSs for antenna ports 7 and 8 may be located in resource elements (REs) indicated as DM RS CDM group 1, which may be multiplexed by an orthogonal code.
  • the DM RSs for antenna ports 9 and 10 may be located in the resource elements indicated as DM RS group 2 in the example of FIG. 7, which may be multiplexed by an orthogonal code.
  • FIG. 8 is a diagram illustrating examples of a CSI-RS pattern defined in an LTE-A system.
  • FIG. 8 shows the location of a resource element in which a CSI-RS is transmitted on one resource block in which downlink data is transmitted (12 subcarriers on 14 0FDM symbol X frequencies in time in case of a general CP).
  • one of the CSI-RS patterns of FIGS. 8 (a) to 8 (e) may be used.
  • the CSI-RS may be transmitted for eight antenna ports (antenna port index 15, 16, 17, 18, 19, 20, 21, and 22) which are additionally defined in the LTE-A system.
  • the CSI-RSs for different antenna ports can be divided into being located in different frequency resources (subcarriers) and / or different time resources (0 FDM symbols) (ie they can be multiplexed by FDM and / or TDM schemes).
  • CSI-RSs for different antenna ports located on the same time-frequency resource may be distinguished from each other by orthogonal codes (i.e., multiplexed by CDM).
  • CDM multiplexed by CDM
  • CSI-RSs for antenna ports 15 and 16 may be located in resource elements (REs) indicated as CSI-RS CDM group 1, and they may be multiplexed by an orthogonal code.
  • CSI-RS is in the example of FIG.
  • Resource elements indicated as CDM group 2 may include CSI-RSs for antenna ports 17 and 18, which may be multiplexed by orthogonal codes.
  • CSI-RSs for antenna ports 19 and 20 may be located in resource elements indicated as CSI—RS CDM group 3, which may be multiplexed by an orthogonal code.
  • CSI-RSs for antenna ports 21 and 22 may be located in resource elements indicated as CSI—RS CDM group 4, which may be multiplexed by an orthogonal code.
  • FIG. 9 is a diagram illustrating an example of a zero power (ZP) CSI-RS pattern defined in an LTE-A system.
  • ZP CSI-RS There are two main uses of ZP CSI-RS. Firstly, it is used to improve CSI-RS performance. That is, one network mutes the CSI-RS RE of the other network to improve the performance of the CSI-RS measurement of the other network, and allows the UE to perform rate matching correctly. Set RE can be informed by setting ZP CSI-RS. Secondly, it is used for interference measurement for CoMP CQI calculation. That is, some networks perform muting on the ZP CRS-RS RE and the UE can calculate CoMP CQI by measuring interference from the ZP CSI-RS.
  • FIGS. 6 to 9 are merely exemplary, and are not limited to specific RS patterns in various embodiments of the present invention. That is, even when RS patterns different from those of FIGS. 6 to 9 are defined and used, various embodiments of the present invention may be equally applied.
  • the FDR refers to a transmitter-end receiver technology that enables a base station and / or a terminal to transmit the uplink / downlink without diplexing by dividing the number of times and intervals.
  • FIG. 10 is a diagram illustrating an example of an interference situation in an FDR scheme.
  • each terminal may receive a signal transmitted from another base station or terminal while transmitting. That is, as shown in the dotted line of FIG. 10, a communication environment in which its own transmission signal directly causes magnetic interference to its reception module (or receiver) is formed.
  • Magnetic interference means that its own transmission signal directly interferes with its receiver, as shown in FIG.
  • a self f interference signal is received stronger than a desi red signal. Therefore, it is important to completely eliminate the interference cancellation work.
  • multi-user interference refers to interference occurring between terminals. For example, it means that a signal transmitted by a terminal is received by an adjacent terminal and acts as interference.
  • Half-duplex e.g., FDD, TDD
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • interference does not occur between uplink and downlink.
  • uplink and downlink share the same frequency / time resource, interference occurs between the base station transmitting data and neighboring terminals as shown in FIG. 10.
  • intercell interference refers to interference occurring between base stations.
  • a signal transmitted by one base station is received by a receiving antenna of another base station to act as interference.
  • the FDR can increase the frequency efficiency by sharing the same time / frequency resources in the uplink and downlink, but the increase in interference may cause a limitation in improving the frequency efficiency.
  • (1) magnetic interference is the first problem to be solved in order to operate FDR due to the influence of interference that occurs only in FDR.
  • 10 shows an example of FDR in a magnetic interference situation. That is, a signal transmitted from one terminal is received as it is by the receiving antenna of the same terminal to act as interference.
  • the receiving end receives a signal in which the circuit signal and the magnetic interference signal are added together.
  • ADC analog log-to-digital converter
  • the present invention provides a receiving filter capable of removing an interference signal magnetically by a receiving end.
  • a receiving filter capable of removing an interference signal magnetically by a receiving end.
  • the spatial domain filter in the RF stage before the ADC of the receiver the amplitude and phase of the received signal can be adjusted. This enables the Singular Value Decomposition (SVD) operation in the digital domain. It can also be done in reverse, eliminating magnetic interference.
  • Singular Value Decomposition Singular Value Decomposition
  • the magnetic interference channel can be removed by the orthogonality.
  • the magnetic interference phenomenon in the FDR system is a fundamental cause of the ADC saturation problem that causes the performance degradation of the system.
  • Various preprocessing techniques have been studied at the transmitter for eliminating interference signals.
  • a null-space project ion technique in which a self-interference signal is removed at the transmitting end by using a nuU-space of a magnetic interference channel as a preprocessor.
  • the null-projection scheme requires transmit antennas equal to or greater than the number of receive antennas, and at least ⁇ of the total 'spatial resources are used for nulling the self-interference signal rather than data transmission. Therefore, the amount of spatial resources used for data transmission is relatively reduced. This null-projection can also be performed at the receiving end.
  • receive antennas equal to or greater than the number of transmit antennas are required, and a total of at least ⁇ or more spatial resources in total ⁇ Used.
  • a total of at least ⁇ or more spatial resources in total ⁇ Used As the conventional techniques for eliminating magnetic interference in common use a lot of spatial resources, data transmission loss occurs more than when all antenna resources are used for data transmission and reception.
  • the UE can easily obtain not only its own interference channel but also information on transmission symbols. Therefore, the singular value decomposition of the received self-interference signal H " s 'can be performed.
  • the self-interference signal H » S ' is a vector of size, not a matrix.
  • the null-space of the self-interference signal vector is used as a post processor.
  • Receive filter based on symbol information requires only 1 spatial resource regardless of the number of transmission streams, that is, the spatial resources required for self-interference cancellation can be significantly reduced compared to the conventional schemes. By utilizing the space resources obtained through this, the data rate can be improved.
  • Equation expressing the singular value decomposition of the received self-interference signal vector H " S " of the size of ⁇ 1 is as follows.
  • the proposed filter can remove the self-interference signal, and the equation representing this can be expressed as follows.
  • the SVD is performed after multiplying the matrix m by the transmission signal s.
  • the transmission signal s it is difficult to know the transmission signal s.
  • s is a signal transmitted by itself, so s can be known.
  • FIG. 11 is a flowchart illustrating a method of canceling magnetic interference in an FDR system according to the present invention.
  • a matrix ⁇ for a channel between a transmitting antenna and a receiving antenna of a first device is obtained through feedback, and information about a transmission signal s transmitted by the first device to the second device is obtained. (S1101).
  • SVD is performed on Hs to generate a left singular vector (S1103).
  • a reception filter matrix G is generated using a null-spaced base vector among the left singular vectors included in the effective interference behavior Hs (S1105).
  • magnetic interference corresponding to the transmission signal s is removed from the desired signal received from the second apparatus using the reception filter matrix G (S1107).
  • a first device simultaneously receives a desired signal (des i red signal) received from a second device and a signal transmitted by the first device.
  • the receiver performs singular value decomposition (SVD) on a magnetic interference signal through a spatial filter in the RF stage. Through this, a null-space vector of the magnetic interference signal can be calculated, and the magnetic interference signal can be eliminated by using this.
  • SMD singular value decomposition
  • FIG. 12 is a graph illustrating channel capacities of the proposed technique and the null-space projection technique of the present invention.
  • the total number of antennas is assumed to be 9, and in the case of the null-space projection scheme, 6 transmit antennas and 3 receive antennas are used. Applied. This is a condition for obtaining the maximum channel capacity for each technique.
  • the signal-to_interference rat io (SIR) value is assumed to be -93 dB. Both techniques can achieve higher channel capacity as signal-to-noise rat io increases.
  • SIR signal-to_interference rat io
  • Both techniques can achieve higher channel capacity as signal-to-noise rat io increases.
  • the method according to the present invention can obtain an improved channel capacity compared to the conventional null-space projection technique.
  • a greater performance improvement can be obtained in a high SNR period.
  • the null interference of the magnetic interference channel ⁇ '' is used as a post-processor to eliminate magnetic interference.
  • more than 'spatial resources' which is at least the number of transmit antennas, have been used to eliminate magnetic interference.
  • the method according to the present invention uses the null-space of the received self-interference signal vector H " S " as a post processor. Therefore, the magnetic interference is eliminated using only one spatial resource, and the remaining space of ⁇ 1 is eliminated. By using the resource for data transmission and reception, an improved data rate can be obtained compared to conventional magnetic interference cancellation techniques.
  • Figure 13 illustrates a first device and a second device that can be applied to an embodiment of the present invention.
  • a wireless communication system includes a first device 1310 and a second device 1320.
  • the first device 1310 includes a processor 1313, a memory 1314, and a radio frequency (RF) unit 1311, 1312.
  • the processor 1313 may be configured to implement the procedures and / or methods proposed by the present invention.
  • the memory 1314 is connected with the processor 1313 and stores various information related to the operation of the processor 1313.
  • the RF unit 1316 is connected with the processor 1313 and transmits and / or exemplifies a radio signal. ⁇ 3 RT? Yoni 3 ⁇ 42 " ⁇
  • the processor 1323 may be configured to implement the procedures and / or methods proposed by the present invention.
  • the memory 1324 is connected with the processor 1323 and stores various information related to the operation of the processor 1323.
  • the RF units 1321 and 1322 are connected to the processor 1323 and transmit and / or receive a radio signal.
  • the first device 1310 and / or the second device 1320 can have a single antenna or multiple antennas.
  • the base station may be performed by its upper node. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station may be performed by a base station or network nodes other than the base station.
  • a base station may be replaced by terms such as a fixed station, a Node B, an eNodeB (eNB), an access point, and the like.
  • the embodiment according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • one embodiment of the invention Icat ion specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), programmable gate arrays (FPGAs), processors, controllers, and microcontrollers. It may be implemented by a microprocessor, for example.
  • an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform all the functions or operations described above.
  • the software code may be stored in the memory unit and driven by the processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un système d'accès sans fil prenant en charge un environnement de transmission radio duplex (FDR). Un procédé pour éliminer l'interférence dans un signal reçu par un premier appareil en provenance d'un second appareil dans un système d'accès sans fil prenant en charge des transmissions FDR selon un mode de réalisation de la présente invention consiste à : acquérir une matrice, H, pour des canaux entre le premier appareil et un second appareil au moyen d'informations de rétroaction reçues à partir du second appareil ; acquérir des informations concernant un signal de transmission, s, émis par le premier appareil ; générer une matrice de filtres de réception, G, par utilisation de vecteurs de base d'espace nul parmi des vecteurs singuliers gauche inclus dans une matrice d'interférence effective, Hs, générée par multiplexage de la matrice, H, et du signal de transmission, s ; et éliminer l'interférence automatique correspondant au signal de transmission, s, à partir d'un signal souhaité reçu en provenance du second appareil par utilisation de la matrice de filtres de réception, G.
PCT/KR2014/010518 2014-11-04 2014-11-04 Procédé et appareil pour recevoir un signal dans un système d'accès sans fil prenant en charge une transmission radio duplex (fdr) WO2016072533A1 (fr)

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PCT/KR2014/010518 WO2016072533A1 (fr) 2014-11-04 2014-11-04 Procédé et appareil pour recevoir un signal dans un système d'accès sans fil prenant en charge une transmission radio duplex (fdr)
KR1020177011256A KR102284370B1 (ko) 2014-11-04 2014-11-04 Fdr 전송을 지원하는 무선접속시스템에서 신호를 수신하는 방법 및 장치

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