WO2014086183A1 - 处理干扰的方法及装置 - Google Patents

处理干扰的方法及装置 Download PDF

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Publication number
WO2014086183A1
WO2014086183A1 PCT/CN2013/083359 CN2013083359W WO2014086183A1 WO 2014086183 A1 WO2014086183 A1 WO 2014086183A1 CN 2013083359 W CN2013083359 W CN 2013083359W WO 2014086183 A1 WO2014086183 A1 WO 2014086183A1
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WIPO (PCT)
Prior art keywords
user equipment
dmrs pilot
pilot sequence
signal
interference
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PCT/CN2013/083359
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English (en)
French (fr)
Inventor
王锐
余荣道
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2015545645A priority Critical patent/JP5993095B2/ja
Priority to EP13860363.4A priority patent/EP2930859B1/en
Publication of WO2014086183A1 publication Critical patent/WO2014086183A1/zh
Priority to US14/731,122 priority patent/US9723617B2/en
Priority to US15/630,692 priority patent/US10201002B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891Spatial equalizers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0417Feedback systems
    • H04B7/0421Feedback systems utilizing implicit feedback, e.g. steered pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J11/00Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023Interference mitigation or co-ordination
    • H04J11/0026Interference mitigation or co-ordination of multi-user interference
    • H04J11/0036Interference mitigation or co-ordination of multi-user interference at the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/14Direct-mode setup
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters
    • H04B17/345Interference values
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J2211/00Orthogonal indexing scheme relating to orthogonal multiplex systems
    • H04J2211/003Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
    • H04J2211/005Long term evolution [LTE]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/16Interfaces between hierarchically similar devices
    • H04W92/18Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for processing interference. Background technique
  • D2D device-to-device
  • the spectrum used by D2D communication is different from that of cellular communication.
  • the spectrum that is, the spectrum of D2D and cellular communication are orthogonal to each other, can avoid mutual interference, but does not fully utilize the capability of the terminal multi-antenna, and has low utilization of resources.
  • the uplink spectrum performs direct communication between terminals (D2D communication). That is, in the same spectrum, both the uplink user transmits signals to the base station, and the D2D generation end transmits data to the D2D receiver.
  • D2D communication direct communication between terminals
  • This method of sharing spectrum can greatly improve the spectrum utilization of the system, but it also brings interference between different modes of transmission.
  • the above interference can be eliminated in the spatial dimension.
  • D2D terminals In order to eliminate interference, D2D terminals must also have the ability to detect interference.
  • the embodiment of the invention provides a method and a device for processing interference, which can eliminate the interference of the signal transmitted by the uplink user on the signal received by the D2D receiving end.
  • the embodiment of the present invention provides a method for processing interference, where the method includes: measuring, according to a first demodulation reference signal DMRS pilot symbol carried by a first subcarrier used by an uplink user equipment, An interference channel matrix of the uplink interference channel of the user equipment to the D2D receiving end; the first subcarrier is a D2D transmitting end and the uplink user equipment shares a subcarrier;
  • an embodiment of the present invention provides an apparatus for processing interference, where the apparatus includes: a measuring unit, configured to transmit, according to a first demodulation reference signal, a DMRS pilot symbol carried by a first subcarrier used by an uplink user equipment. And measuring an interference channel matrix of the uplink interference channel of the uplink user equipment to the D2D receiving end; the first subcarrier is a D2D transmitting end and the uplink user equipment sharing a subcarrier, and sending the uplink interference channel matrix to the computing unit ;
  • a calculating unit configured to receive the interference channel matrix sent by the measuring unit, calculate a zero space matrix of the uplink interference channel according to the interference channel matrix, and send the zero space matrix to a processing unit;
  • a processing unit configured to receive, by the computing unit, the null space matrix, and use the zero space matrix to process, by the D2D receiving end, a signal received by the first subcarrier from a D2D transmitting end, to eliminate the An interference signal from the uplink user equipment in the signal.
  • the interference channel matrix of the uplink interference channel of the uplink user equipment to the D2D receiving end is measured according to the first demodulation reference signal DMRS pilot symbol carried by the first subcarrier used by the uplink user equipment; a subcarrier is a D2D transmitting end and the uplink user equipment shares a subcarrier; calculating a zero space matrix of the uplink interference channel according to the interference channel matrix; and using the zero space matrix to pass the D2D receiving end
  • the signal from the D2D transmitter received by a subcarrier is processed to cancel the interference signal from the uplink user equipment in the signal.
  • the D2D transmitting end does not need to consider how to avoid the interference of the uplink user at the D2D receiving end, which greatly simplifies the requirement of the D2D transmission to sense the uplink spectrum.
  • FIG. 1 is a flowchart of a method for processing interference according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic structural diagram of an uplink subframe and a D2D frame in an LTE system according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of an apparatus for processing interference according to Embodiment 2 of the present invention.
  • the present application assumes that the cellular system uses an extended version of the LTE protocol or the LTE protocol, but the protection scope of the apparatus and method provided by the embodiments of the present invention is not limited thereto, and may be applied to other cellular systems.
  • the uplink user of the cellular system uses the uplink spectrum and uses multi-carrier transmission.
  • the mode transmits a signal to the base station, that is, different carriers of the uplink spectrum may be allocated to different users for uplink transmission.
  • different uplink users occupy subcarriers of different OFDM.
  • the device-to-device (D2D) transmitting end may use some carriers of the uplink spectrum to transmit signals to the D2D receiving end, and the D2D transmitting end may also occupy several uplink user sub-carriers at the same time, and the D2D receiving end knows in advance that the D2D transmitting end transmits data. Carrier used at the time.
  • D2D communication when D2D communication multiplexes the LTE uplink spectrum, D2D communication also uses the transmission mode of OFDM, and the OFDM symbol is the same as the OFDM symbol of the uplink communication.
  • OFDM symbol is the same as the OFDM symbol of the uplink communication.
  • the D2D transmitter does not have or cannot use the corresponding interference avoidance measures (ie, using the subcarriers of the uplink users farther away from itself).
  • the D2D receiver In the carrier it uses, the D2D receiver not only receives the signal of the D2D transmitter but also receives the signal. Signal to a stronger upstream user. The latter is an interference signal for the D2D receiving end, and needs to use the multiple antennas of the terminal for processing interference.
  • the channel of the uplink user to the D2D receiving end is referred to as an uplink interference channel
  • the channel of the D2D transmitting end to the D2D receiving end is referred to as a D2D channel.
  • the key to the uplink processing interference and D2D signal detection using the terminal antenna capability is to obtain the channel information of the uplink user occupying the same subcarrier and the D2D transmitting end to the D2D receiving end. Since the D2D signal and the uplink signal are on the same subcarrier, and the D2D receiving end may not know the specific pilot sequence transmitted by the uplink user, it is difficult to detect the channel information of the uplink user to the D2D receiving end by using a conventional method. Therefore, Interference signals in the signal cannot be eliminated.
  • FIG. 1 is a flowchart of a method for processing interference according to Embodiment 1 of the present invention. As shown in FIG. 1, the method provided by the embodiment of the present invention includes:
  • a DMRS pilot symbol measuring an interference channel matrix of the uplink interference channel of the uplink user equipment to the D2D receiving end;
  • the first subcarrier is a D2D transmitting end and the uplink user equipment shares a subcarrier.
  • the uplink interference channel can be characterized by its channel matrix. Therefore, in order to be able to measure the channel matrix of the uplink interference channel, the D2D receiver needs to know the first subcarrier used by the uplink user equipment, and the first DMRS used by the first subcarrier.
  • the pilot symbol in addition, although the D2D receiving end can determine the starting position of the first DMRS pilot sequence, but the length cannot be known, therefore, the length of the first DMRS pilot sequence needs to be obtained first, and according to the length thereof. Determining a first DMRS pilot sequence and a first subband, thereby selecting a first subcarrier from the first subband and selecting a first DMRS pilot symbol from the first DMRS pilot sequence.
  • the first sub-band is composed of all sub-carriers shared by the D2D transmitting end and the uplink user equipment.
  • the length of the first DMRS pilot sequence may be calculated according to the previous symbol of the DMRS pilot sequence that the uplink user equipment may use, and the first symbol of the actually received first DMRS pilot sequence.
  • min
  • the number of types, the DMRS pilot sequence that may be used by the uplink user equipment is the length of various known pilot sequences, and is the first received by the first DMRS pilot sequence.
  • the modulus value of each element in the medium, the element ⁇ in which the modulo value is the smallest, the vector i in the corresponding ⁇ is used as the first DMRS pilot sequence.
  • the number of subcarriers included in the first subband used by the uplink user equipment may be calculated according to the length I of the first DMRS pilot sequence, so that the first Subband.
  • selecting the first subcarrier from the first subband selecting the first DMRS pilot symbol from the first DMRS pilot sequence, according to the first subcarrier and the first DMRS pilot symbol
  • the interference channel matrix ⁇ the interference channel matrix of each uplink interference channel corresponding to each subcarrier shared by the D2D transmitting end and the uplink user equipment needs to be measured.
  • the D2D receiving end may further receive a signal from the D2D transmitting end and a signal from the uplink user equipment before step S101.
  • the signal structure received by the D2D receiver has the following characteristics:
  • the structure of the signal is consistent with the signal structure from the uplink user equipment, that is, the signal received by the D2D receiving end organizes the signal according to the subframe, and the subframe and the subframe from the uplink user equipment signal are The time dimension is coincident. And the position of the DMRS pilot sequence in the signal from the D2D transmitting end and the signal from the uplink user equipment received by the D2D receiving end does not coincide.
  • the signal received from the uplink user equipment by the D2D receiving end, corresponding to the received DMRS pilot sequence, is received from the The signal at the D2D transmitter is silent at this location.
  • 2 is a schematic structural diagram of an uplink subframe and a D2D frame in an LTE system according to Embodiment 1 of the present invention.
  • "1" in FIG. 2 indicates a DMRS pilot sequence of an uplink subframe
  • "2" indicates a D2D.
  • the DMRS pilot sequence ⁇ " 3 " of the frame indicates that the D2D frame is silent at the DMRS pilot sequence of the uplink subframe.
  • one uplink subframe is composed of several OFDM symbols, wherein the signal from the uplink user equipment is in one At the position of the DMRS pilot sequence on the two OFDM symbols of the subframe, the signal received from the D2D receiver at the corresponding D2D receiver remains silent on the OFDM symbol.
  • the signal from the D2D transmitting end received by the D2D receiving end by using the first subcarrier is processed by the zero space matrix to cancel an interference signal from the uplink user equipment in the signal.
  • the D2D receiving end may multiply the signal from the D2D transmitting end that is received by the first subcarrier by the zero space matrix of the uplink interference channel corresponding to the subcarrier, and perform D2D channel detection and signal detection. Since the signal detection of the D2D is performed in the null space of the uplink interference channel, the uplink interference has been eliminated.
  • the D2D receiving end measures the interference channel matrix of the uplink interference channel of the uplink user equipment to the D2D receiving end according to the first demodulation reference signal DMRS pilot symbol carried by the first subcarrier used by the uplink user equipment;
  • the first subcarrier is a D2D transmitting end and the uplink user equipment shares a subcarrier; calculating a zero space matrix of the uplink interference channel according to the interference channel matrix; and using the zero space matrix to pass the D2D receiving end
  • the signal received by the first subcarrier from the D2D transmitting end is processed to cancel the interference signal from the uplink user equipment in the signal.
  • the D2D transmitting end does not need to consider how to avoid the interference of the uplink user equipment at the D2D receiving end, which greatly simplifies the requirement of the D2D transmission to sense the uplink spectrum.
  • the position of the DMRS pilot sequence in the signal received from the D2D transmitting end and the signal from the uplink user equipment does not coincide with each other, and the interference when performing uplink interference channel detection can be reduced.
  • FIG. 3 is a schematic diagram of a device for processing interference according to Embodiment 2 of the present invention.
  • the device includes: a measuring unit 301.
  • the measuring unit 301 is configured to measure, according to the first demodulation reference signal DMRS pilot symbol carried by the first subcarrier used by the uplink user equipment, the interference channel matrix of the uplink interference channel of the uplink user equipment to the D2D receiving end;
  • a subcarrier is a D2D transmitting end and the uplink user equipment shares a subcarrier.
  • the uplink interference channel can be characterized by the interference channel matrix, and the interference channel matrix of each uplink interference channel corresponding to each subcarrier shared by the D2D transmitting end and the uplink user equipment needs to be measured.
  • the calculating unit 302 is configured to calculate a null space matrix of the uplink interference channel according to the interference channel matrix.
  • each uplink interference channel corresponding to each subcarrier shared by the D2D transmitting end and the uplink user equipment needs to be calculated.
  • the processing unit 303 is configured to process, by using the zero space matrix, a signal from the D2D transmitting end that is received by the D2D receiving end by using the first subcarrier, to cancel interference from the uplink user equipment in the signal. signal.
  • the D2D receiving end may multiply the signal from the D2D transmitting end that is received by the first subcarrier by the zero space matrix of the uplink interference channel corresponding to the subcarrier, and perform D2D channel detection and signal detection. Since the signal detection of the D2D is performed in the null space of the uplink interference channel, the uplink interference has been eliminated.
  • the measuring unit 301 provided by the embodiment of the present invention specifically includes: a first calculating subunit 310, The second calculation subunit 31 1 , the selection subunit 312 and the measurement subunit 313.
  • the first calculating sub-unit 310 is configured to calculate the first DMRS pilot sequence according to a previous symbol of a DMRS pilot sequence that can be used by the uplink user equipment, and a previous symbol of the actually received first DMRS pilot sequence. length.
  • the uplink interference channel can be characterized by the interference channel matrix. Therefore, in order to be able to measure the interference channel matrix of the uplink interference channel, the D2D receiver needs to know the first subcarrier used by the uplink user equipment, and the first DMRS pilot used by the first subcarrier.
  • the symbol in addition, although the D2D receiving end can determine the starting position of the first DMRS pilot sequence, but the length cannot be known, therefore, the length of the first DMRS pilot sequence needs to be determined first, and the length is determined according to the length.
  • a DMRS pilot sequence and a first subband thereby selecting a first subcarrier from the first subband and selecting a first DMRS pilot symbol from the first DMRS pilot sequence.
  • the first sub-band is composed of all sub-carriers shared by the D2D transmitting end and the uplink user equipment.
  • the first calculation subunit 310 is based on the formula: ⁇ ! ⁇ - ⁇ ; ⁇ , where is the length of the DMRS pilot sequence that may be used by the uplink user equipment, l ⁇ i ⁇ n, w is the number of types of DMRS pilot sequences having different lengths, and the uplink user
  • the DMRS pilot sequence that the device may use is the length of various known pilot sequences, and is the *1 dimension column vector composed of the first symbol of the first DMRS pilot sequence actually received.
  • v ⁇ [v ⁇ V L, ⁇ V L, w is a different DMRS pilot of length £,
  • the number of sequences Take the minimum value of the column vector of the xl dimension, the minimum value, that is, for each pilot sequence length A., you can estimate a minimum value of
  • m according to the formula ⁇ min
  • a second calculating sub-unit 311, configured to calculate a location of the first DMRS pilot sequence and a first sub-band according to a length of the first DMRS pilot sequence, where the first sub-band is used by the D2D transmitting end
  • the uplink user equipment shares a subcarrier composition.
  • the second calculation unit 311 calculates that the sub-Y- V L X Y -V L X according to the formula The minimum value, where z: is the length of the first DMRS pilot sequence, is the number of different DMRS pilot sequences of length z:, and ⁇ is the first DMRS pilot sequence actually received
  • each subcarrier corresponds to one symbol of the DMRS pilot sequence
  • the number of subcarriers included in the first subband used by the uplink user equipment can be calculated according to the length of the first DMRS pilot sequence, so that the first subband can be determined. .
  • the selecting subunit 312 is configured to select the first subcarrier from the first subband, and select the first DMRS pilot symbol from the first DMRS pilot sequence.
  • the measuring subunit 313 is configured to measure the interference channel matrix according to the first subcarrier and the first DMRS pilot symbol.
  • the device further includes a receiving unit 304, configured to receive a signal from the D2D transmitting end and a signal from the uplink user equipment.
  • the signal received by the receiving unit 304 from the D2D transmitting end and the signal from the uplink user equipment are identical in time and structurally identical.
  • the position of the DMRS pilot sequence in the signal received by the receiving unit 304 from the D2D transmitting end and the signal from the uplink user equipment does not coincide.
  • the received signal from the uplink user equipment received by the receiving unit 304 is correspondingly received from the position of the DMRS pilot sequence.
  • the signal at the D2D transmit end is silent at this location.
  • the D2D receiving end measures the interference channel matrix of the uplink interference channel of the uplink user equipment to the D2D receiving end according to the first demodulation reference signal DMRS pilot symbol carried by the first subcarrier used by the uplink user equipment;
  • the first subcarrier is a D2D transmitting end and the uplink user equipment shares a subcarrier; calculating a zero space matrix of the uplink interference channel according to the interference channel matrix; and using the zero space matrix to pass the D2D receiving end
  • the signal received by the first subcarrier from the D2D transmitting end is processed to cancel the interference signal from the uplink user equipment in the signal.
  • the D2D transmitting end does not need to consider how to avoid the interference of the uplink user equipment at the D2D receiving end, which greatly simplifies the requirement of the D2D transmission to sense the uplink spectrum.
  • the position of the DMRS pilot sequence in the signal received from the D2D transmitting end and the signal from the uplink user equipment does not coincide with each other, and the interference when performing uplink interference channel detection can be reduced.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or technology Any other form of storage medium known.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)

Abstract

一种处理干扰的方法及装置,根据上行用户设备使用的第一子载波携带的第一解调参考信号DMRS导频符号,测量该上行用户设备到D2D接收端的上行干扰信道的干扰信道矩阵;该第一子载波为D2D发射端和该上行用户设备共用子载波;根据该干扰信道矩阵计算该上行干扰信道的零空间矩阵;利用该零空间矩阵对该D2D接收端通过该第一子载波接收到的信号进行处理,以消除该信号中来自该上行用户设备的干扰信号。

Description

处理干扰的方法及装置
本申请要求于 2012 年 12 月 5 日提交中国专利局、 申请号为 201210514520. 5,发明名称为 "处理干扰的方法及装置" 的中国专利申请的 优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域, 尤其涉及一种处理干扰的方法及装置。 背景技术
现在大多数设备到设备 (Devie-to-Device,D2D ) 传输技术中, 由于传 统终端的天线数量通常只有 1到 2根, 消除干扰的能力有限, 因此, D2D通 信使用的频谱不同于蜂窝通信的频谱, 即 D2D与蜂窝通信的频谱相互正交, 可以避免相互干扰, 但是没有充分发挥终端多天线的能力, 对资源的利用率 低。
随着天线技术的不断发展,未来的移动终端可能具备更多的天线(比 如多达 8根的天线), 这不仅可以提升蜂窝通信的上下行吞吐量, 还可以让 移动终端复用蜂窝通信的上行频谱进行终端之间的直接通信(D2D通信)。即 在同样的频谱中, 既有上行用户向基站传输信号, 也有 D2D发生端向 D2D接 收端传输数据。
这种共享频谱的做法可以极大提高系统的频谱利用率, 但是也会带 来不同模式传输之间的相互干扰。 然而借助终端的多天线能力, 上述干扰可 以在空间维度进行消除。 为了达到消除干扰的目的, D2D终端还必须具备干 扰感知的能力。
发明内容 本发明实施例提供了一种处理干扰的方法及装置, 可以实现消除上行用 户发射的信号对 D2D接收端接收到信号的干扰。
在第一方面,本发明实施例提供了一种处理干扰的方法,所述方法包括: 根据上行用户设备使用的第一子载波携带的第一解调参考信号 DMRS导 频符号, 测量所述上行用户设备到 D2D接收端的上行干扰信道的干扰信道矩 阵; 所述第一子载波为 D2D发射端和所述上行用户设备共用子载波;
根据所述干扰信道矩阵计算所述上行干扰信道的零空间矩阵;
利用所述零空间矩阵对所述 D2D接收端通过所述第一子载波接收到的来 自 D2D发射端的信号进行处理, 以消除所述信号中来自所述上行用户设备的 干扰信号。
在第二方面,本发明实施例提供了一种处理干扰的装置,所述装置包括: 测量单元, 用于根据上行用户设备使用的第一子载波携带的第一解调参 考信号 DMRS导频符号, 测量所述上行用户设备到 D2D接收端的上行干扰信 道的干扰信道矩阵; 所述第一子载波为 D2D发射端和所述上行用户设备共用 子载波, 将所述上行干扰信道矩阵发送至计算单元;
计算单元, 用于接收所述测量单元发送的所述干扰信道矩阵, 根据所述 干扰信道矩阵计算所述上行干扰信道的零空间矩阵,将所述零空间矩阵发送 至处理单元;
处理单元, 用于接收所述计算单元发送所述零空间矩阵, 利用所述零空 间矩阵对所述 D2D接收端通过所述第一子载波接收到的来自 D2D发射端的信 号进行处理, 以消除所述信号中来自所述上行用户设备的干扰信号。 本发明实施例中, 根据上行用户设备使用的第一子载波携带的第一解调 参考信号 DMRS导频符号, 测量所述上行用户设备到 D2D接收端的上行干扰 信道的干扰信道矩阵; 所述第一子载波为 D2D发射端和所述上行用户设备共 用子载波;根据所述干扰信道矩阵计算所述上行干扰信道的零空间矩阵; 利 用所述零空间矩阵对所述 D2D接收端通过所述第一子载波接收到的来自 D2D 发射端的信号进行处理, 以消除所述信号中来自所述上行用户设备的干扰信 号。从而当 D2D传输复用上行频谱时, D2D发射端可以不需要考虑如何在 D2D 接收端避免上行用户的干扰, 极大简化了 D2D传输对上行频谱进行感知的需 求。
附图说明
图 1为本发明实施例一提供的处理干扰的方法流程图;
图 2为本发明实施例一提供的 LTE系统中上行子帧和 D2D帧结构示意图; 图 3为本发明实施例二提供的处理干扰的装置示意图。
具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 下面结合附图对本发明 具体实施例作进一歩的详细描述。
为方便叙述, 本申请假定蜂窝系统使用的是 LTE协议或者 LTE协议的演 进版本, 但是本发明实施例提供的装置和方法的保护范围不限于此, 也可以 用于其他蜂窝系统。
为使本发明实施例更加清楚, 这里首先对本发明实施例的应用场景做具 体介绍:
在蜂窝系统中, 蜂窝系统的上行用户通过上行频谱, 使用多载波的传输 方式向基站发射信号, 即上行频谱的不同载波可能被分配给不同的用户进行 上行传输。例如, LTE系统中, 不同的上行用户占用不同 OFDM的子载波。 设 备到设备 (D2D ) 发射端可能会利用上行频谱的某些载波向 D2D接收端发射 信号, D2D发射端也可能同时占用几个上行用户的子载波, 并且 D2D接收端 预先知道 D2D发射端发射数据时所利用的载波。 例如, 当 D2D通信复用 LTE 上行频谱时, D2D通信也使用 OFDM的传输方式, 并且 OFDM符号与上行通信 的 OFDM符号同歩。 这样, 在同一个子载波上, 可能既有 D2D通信的信号, 也有上行通信的信号。
很多情况下, D2D发射端没有或者无法使用相应的干扰避免措施 (即使 用距离自己较远的上行用户的子载波), 在它使用的载波中 D2D接收端不仅 接收到 D2D发射端的信号还可能接收到较强的上行用户的信号。而后者对于 D2D接收端而言是干扰信号, 需要利用终端的多天线进行处理干扰的。 为了 方便叙述, 下面把上行用户到 D2D接收端的信道称为上行干扰信道, 把 D2D 发射端到 D2D接收端的信道称为 D2D信道。
利用终端天线能力进行上行处理干扰的和 D2D信号检测的关键是获取占 用相同子载波的上行用户和 D2D发射端到 D2D接收端的信道信息。 由于 D2D 信号和上行信号是在相同的子载波上, 且 D2D接收端可能不知道上行用户发 射的具体的导频序列, 使用传统的办法很难检测出上行用户到 D2D接收端的 信道信息, 因此, 无法消除信号中的干扰信号。
图 1为本发明实施例一提供的处理干扰的方法流程图。 如图 1所示, 本 发明实施例提供的方法包括:
S 101,根据上行用户设备使用的第一子载波携带的第一解调参考信号 DMRS导频符号,测量所述上行用户设备到 D2D接收端的上行干扰信道的干扰 信道矩阵; 所述第一子载波为 D2D发射端和所述上行用户设备共用子载波。 具体地, 上行干扰信道可以通过其信道矩阵表征, 因此, 为了能够测量上行 干扰信道的信道矩阵, D2D接收端需要知道上行用户设备使用的第一子载波, 以及第一子载波使用的第一 DMRS导频符号, 另外, D2D接收端虽然可以判 断出第一 DMRS导频序列的起始位置, 但却无法获知其长度, 因此, 需要先 求出第一 DMRS导频序列的长度, 并根据其长度确定第一 DMRS导频序列及第 一子带, 从而从第一子带中选择第一子载波以及从第一 DMRS导频序列中选 择第一 DMRS导频符号。 其中, 第一子带由所述 D2D发射端和所述上行用户 设备共用的所有子载波组成。
以 LTE蜂窝系统为例, 在 LTE等蜂窝系统中, 不同长度的 DMRS导频序 列有着不同的结构。 即不同长度的 DMRS导频序列的前 K个符号不是完全相 同的, 因此, 通过比较 D2D接收端实际接收到的 DMRS导频序列的前 K个符 号和现有已知的不同长度的 DMRS的前 K个符号, 可以估计出上行干扰用户 实际使用的 DMRS导频序列, 具体方法为:
首先, 可以根据上行用户设备可能使用的 DMRS导频序列的前 个符号, 和实际接收到的第一 DMRS导频序列的前 个符号, 计算所述第一 DMRS导频 序列的长度。
即可以根据公式^ = min |y - ^ |计算 ', 其中, 为所述上行用户设 备可能使用的 DMRS导频序列的长度, l≤i≤n, «为具有不同长度的 DMRS导 少」序列的种类数量, 上行用户设备可能使用的 DMRS导频序列即为现有已知 的各种导频序列的长度, Γ为由实际接收到的所述第一 DMRS导频序列的前 个符号组成的 *l维度的列向量, VL-为由所述上行用户设备可能使用的 个 长度为 的 DMRS导频序列的前 个符号组成的矩阵, ^=[ ,l ,..., ], m 为长度为 的不同 DMRS导频序列的个数, 为使
Figure imgf000007_0001
取最小值的 xl维 度的列向量, 为 的最小值, 即每确定一个导频序列长度 £,, 可以 根据公式
Figure imgf000007_0002
表示;
通过上述过程计算出所有可能的 后, 可以再根据公式 ; =argmini, ^ 计算使 取最小值的 ,, 所述 为所述第一 DMRS导频序列的长度。
其次,可以根据第一 DMRS导频序列的长度 和公式 =argmin Y-VL X 计算使 Y-VL X取最小值的 , 其中,
的个数, y为由实际接收到的所述第一 DMRS 导频序列的前 个符号组成的 *l维度的列向量, 和 为 xl维度的列向量, ^=[ , x„/, 为由 所述上行用户设备可使用的 个长度为 的 DMRS 导频序列的前 个符号组 成的矩阵, = [vf ,V^" V ], VL" X* = xl Vf +x2 Vf +.. ,+ ,. Vf +...+xmV , l≤i≤m。
Figure imgf000007_0003
中每个元素的模值, 取模值最小的元素 χ,.对应的 ^中的向量 i 作为所述第一 DMRS导频序列。
由于每个子载波对应 DMRS导频序列的一个符号, 因此, 可以根据第一 DMRS 导频序列的长度 I:计算上行用户设备使用的第一子带所包含的子载波 的数目, 从而可以确定第一子带。
最后, 从第一子带中选择所述第一子载波, 从第一 DMRS导频序列中选 择所述第一 DMRS导频符号, 根据所述第一子载波和所述第一 DMRS导频符号
:所述干扰信道矩阵 < 需要说明的是, D2D发射端和上行用户设备共用的每个子载波对应的每 个上行干扰信道的干扰信道矩阵都需要测量。
可选地, 在歩骤 S101之前 D2D接收端还可以接收来自 D2D发射端的信 号以及来自所述上行用户设备的信号。为了使得 D2D接收端能够检测上行用 户设备到自己的信道, D2D接收端接收到的信号结构有如下特点:
在时间维度上, 该信号的结构与来自上行用户设备的信号结构一致, 即 D2D接收端接收到的信号是按照子帧的方式组织信号的, 该子帧和来自上行 用户设备信号的子帧在时间维度上是重合的。并且 D2D接收端接收到的来自 所述 D2D发射端的信号和来自所述上行用户设备的信号中的 DMRS导频序列 的位置不重合。
优选地, 为了能够更好的进行上行用户设备的上行干扰信道检测, D2D 接收端接收到的来自上行用户设备的信号中, 在有 DMRS导频序列的位置上, 对应的接收到的来自所述 D2D发射端的信号在该位置上静默。 图 2为本发明 实施例一提供的 LTE系统中上行子帧和 D2D帧结构示意图, 如图 2所示, 图 2中的 " 1 "表示上行子帧的 DMRS导频序列, " 2 "表示 D2D帧的 DMRS导频序 歹 " 3 "表示在 D2D帧在上行子帧的 DMRS导频序列处静默, 可知, 一个上 行子帧由若干个 OFDM符号构成, 其中, 在来自上行用户设备的信号在一个 子帧的两个 OFDM符号上为 DMRS导频序列的位置上, 对应的 D2D接收端接收 到的来自 D2D发射端的信号在该 OFDM符号上保持静默。
S102,根据所述干扰信道矩阵计算所述上行干扰信道的零空间矩阵。 具体地, 可以根据公式 g*H = o计算所述零空间矩阵, 其中, β为所述 零空间矩阵, H为所述干扰信道矩阵。 需要说明的是, D2D发射端和上行用户设备共用的每个子载波对应的每 个上行干扰信道的零空间矩阵都需要计算。
S 103,利用所述零空间矩阵对所述 D2D接收端通过所述第一子载波接收 到的来自 D2D发射端的信号进行处理, 以消除所述信号中来自所述上行用户 设备的干扰信号。
具体地, D2D 接收端可以将其通过所述第一子载波接收到的来自 D2D 发射端的信号乘上该子载波对应的上行干扰信道的零空间矩阵, 再进行 D2D 信道检测和信号检测。 由于 D2D的信号检测是在上行干扰信道的零空间中进 行的, 因此, 上行干扰已经被消除。
本发明实施例中, D2D接收端根据上行用户设备使用的第一子载波携带 的第一解调参考信号 DMRS导频符号, 测量所述上行用户设备到 D2D接收端 的上行干扰信道的干扰信道矩阵; 所述第一子载波为 D2D发射端和所述上行 用户设备共用子载波;根据所述干扰信道矩阵计算所述上行干扰信道的零空 间矩阵; 利用所述零空间矩阵对所述 D2D接收端通过所述第一子载波接收到 的来自 D2D发射端的信号进行处理, 以消除所述信号中来自所述上行用户设 备的干扰信号。 从而当 D2D传输复用上行频谱时, D2D发射端可以不需要考 虑如何在 D2D接收端避免上行用户设备的干扰, 极大简化了 D2D传输对上行 频谱进行感知的需求。 另外, D2D接收端接收到的来自所述 D2D发射端的信 号和来自所述上行用户设备的信号中的 DMRS导频序列的位置不重合, 可以 减小进行上行干扰信道检测时的干扰。
相应地, 本发明实施例提供了一种处理干扰的装置, 图 3为本发明实施 例二提供的处理干扰的装置示意图。 如图 3所示, 所述装置包括: 测量单元 301、 计算单元 302和处理单元 303。
测量单元 301, 用于根据上行用户设备使用的第一子载波携带的第一解 调参考信号 DMRS导频符号, 测量所述上行用户设备到 D2D接收端的上行干 扰信道的干扰信道矩阵; 所述第一子载波为 D2D发射端和所述上行用户设备 共用子载波。
需要说明的是, 上行干扰信道可以通过干扰信道矩阵表征, D2D发射端 和上行用户设备共用的每个子载波对应的每个上行干扰信道的干扰信道矩 阵都需要测量。
计算单元 302, 用于根据所述干扰信道矩阵计算所述上行干扰信道的零 空间矩阵。
具体地, 计算单元 302根据公式 e*H = o计算所述零空间矩阵, 其中, β 为所述零空间矩阵, H为所述干扰信道矩阵。
需要说明的是, D2D发射端和上行用户设备共用的每个子载波对应的每 个上行干扰信道的零空间矩阵都需要计算。
处理单元 303, 用于利用所述零空间矩阵对所述 D2D接收端通过所述第 一子载波接收到的来自 D2D发射端的信号进行处理, 以消除所述信号中来自 所述上行用户设备的干扰信号。
具体地, D2D 接收端可以将其通过所述第一子载波接收到的来自 D2D 发射端的信号乘上该子载波对应的上行干扰信道的零空间矩阵, 再进行 D2D 信道检测和信号检测。 由于 D2D的信号检测是在上行干扰信道的零空间中进 行的, 因此, 上行干扰已经被消除。
本发明实施例提供的测量单元 301具体包括: 第一计算子单元 310、 第 二计算子单元 31 1、 选择子单元 312和测量子单元 313。
第一计算子单元 310,用于根据上行用户设备可使用的 DMRS导频序列的 前 个符号, 和实际接收到的第一 DMRS 导频序列的前 个符号, 计算所述 第一 DMRS导频序列的长度。
上行干扰信道可以通过干扰信道矩阵表征, 因此, 为了能够测量上行干 扰信道的干扰信道矩阵, D2D接收端需要知道上行用户设备使用的第一子载 波, 以及第一子载波使用的第一 DMRS导频符号, 另外, D2D接收端虽然可 以判断出第一 DMRS导频序列的起始位置, 但却无法获知其长度, 因此, 需 要先求出第一 DMRS导频序列的长度, 并根据其长度确定第一 DMRS导频序列 及第一子带, 从而从第一子带中选择第一子载波以及从第一 DMRS导频序列 中选择第一 DMRS导频符号。 其中, 第一子带由所述 D2D发射端和所述上行 用户设备共用的所有子载波组成。
具体地,第一计算子单元 310根据公式 :!^!^ ^-^;^计算^,其中, ,为所述上行用户设备可能使用的 DMRS导频序列的长度, l≤i≤n, w为具有 不同长度的 DMRS导频序列的种类数量, 上行用户设备可能使用的 DMRS导频 序列即为现有已知的各种导频序列的长度, Γ为由实际接收到的所述第一 DMRS 导频序列的前 个符号组成的 *1维度的列向量, 为由所述上行用 户设备可能使用的 个长度为 的 DMRS导频序列的前 个符号组成的矩阵, v^ [v^ VL, ^ VL, w为长度为£,的不同 DMRS 导频序列的个数, 为使
Figure imgf000011_0001
取最小值的 x l维度的列向量, 为 的最小值, 即每确定 一个导频序列长度 A.,可以根据公式^ = min |m |估计出一个使 |m 取最小值的 , 该最小值用 表示。 通过上述过程计算出所有可能的 后, 可以再根据公式 ; argmin^ EA 计算使 取最小值的 ,, 所述 为所述第一 DMRS导频序列的长度。 第 二计算子单元 311, 用于根据所述第一 DMRS导频序列的长度计算所述第一 DMRS导频序列和第一子带的位置,所述第一子带由所述 D2D发射端和所述上 行用户设备共用子载波组成。
具体地,第二计算子单元 311根据公式 Y -VL X计算使 Y- VL X
Figure imgf000012_0001
最小值的 , 其中, z:为所述第一 DMRS导频序列的长度, 为长度为 z:的 不同 DMRS导频序列的个数, Γ为由实际接收到的所述第一 DMRS导频序列的 前 个符号组成的 *1维度的列向量, ^和^为 x l维度的列向量, r = [Xl ,x2 ,...,x , 为由所述上行用户设备可使用的 个长度为 z:的 DMRS 导 频 序 列 的 前 个 符 号 组 成 的 矩 阵 , , VL'X* - Xl Vf +x2Vf Vf +...+xmV , l≤ ≤ 。 计算所述 T中每个元素的模值, 取模值最小的元素 χ,.对应的 ^中的向量 作为所述第一 DMRS导频序列。
由于每个子载波对应 DMRS导频序列的一个符号, 因此, 可以根据第一 DMRS 导频序列的长度 计算上行用户设备使用的第一子带所包含的子载波 的数目, 从而可以确定第一子带。
选择子单元 312, 用于从所述第一子带中选择所述第一子载波, 从所述 第一 DMRS导频序列中选择所述第一 DMRS导频符号。
测量子单元 313,用于根据所述第一子载波和所述第一 DMRS导频符号测 量所述干扰信道矩阵。
可选地, 所述装置还包括接收单元 304, 用于接收来自 D2D发射端的信 号以及来自所述上行用户设备的信号。 接收单元 304接收到的来自所述 D2D发射端的信号和来自所述上行用户 设备的信号在时间上同歩并且结构一致。 接收单元 304 接收到的来自所述 D2D发射端的信号和来自所述上行用户设备的信号中的 DMRS导频序列的位 置不重合。
优选地, 为了能够更好的进行上行用户设备的上行干扰信道检测, 接收 单元 304接收到的来自所述上行用户设备的信号中, 在有 DMRS导频序列的 位置上, 对应的接收到的来自所述 D2D发射端的信号在该位置上静默。
本发明实施例中, D2D接收端根据上行用户设备使用的第一子载波携带 的第一解调参考信号 DMRS导频符号, 测量所述上行用户设备到 D2D接收端 的上行干扰信道的干扰信道矩阵; 所述第一子载波为 D2D发射端和所述上行 用户设备共用子载波;根据所述干扰信道矩阵计算所述上行干扰信道的零空 间矩阵; 利用所述零空间矩阵对所述 D2D接收端通过所述第一子载波接收到 的来自 D2D发射端的信号进行处理, 以消除所述信号中来自所述上行用户设 备的干扰信号。 从而当 D2D传输复用上行频谱时, D2D发射端可以不需要考 虑如何在 D2D接收端避免上行用户设备的干扰, 极大简化了 D2D传输对上行 频谱进行感知的需求。 另外, D2D接收端接收到的来自所述 D2D发射端的信 号和来自所述上行用户设备的信号中的 DMRS导频序列的位置不重合, 可以 减小进行上行干扰信道检测时的干扰。
专业人员应该还可以进一歩意识到, 结合本文中所公开的实施例描述的 各示例的单元及算法歩骤, 能够以电子硬件、 计算机软件或者二者的结合来 实现, 为了清楚地说明硬件和软件的可互换性, 在上述说明中已经按照功能 一般性地描述了各示例的组成及歩骤。这些功能究竟以硬件还是软件方式来 执行, 取决于技术方案的特定应用和设计约束条件。 专业技术人员可以对每 个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为 超出本发明的范围。
结合本文中所公开的实施例描述的方法或算法的歩骤可以用硬件、处理 器执行的软件模块, 或者二者的结合来实施。 软件模块可以置于随机存储器 ( RAM), 内存、 只读存储器 (R0M)、 电可编程 R0M、 电可擦除可编程 R0M、 寄存器、 硬盘、 可移动磁盘、 CD-R0M、 或技术领域内所公知的任意其它形式 的存储介质中。
以上所述的具体实施方式, 对本发明的目的、 技术方案和有益效果进行 了进一歩详细说明, 所应理解的是, 以上所述仅为本发明的具体实施方式而 已, 并不用于限定本发明的保护范围, 凡在本发明的精神和原则之内, 所做 的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求
1. 一种处理干扰的方法, 其特征在于, 所述方法包括:
根据上行用户设备使用的第一子载波携带的第一解调参考信号 DMRS导 频符号, 测量所述上行用户设备到设备到设备 D2D接收端的上行干扰信道的 干扰信道矩阵; 所述第一子载波为 D2D发射端和所述上行用户设备共用子载 波;
根据所述干扰信道矩阵计算所述上行干扰信道的零空间矩阵;
利用所述零空间矩阵对所述 D2D接收端通过所述第一子载波接收到的来 自 D2D发射端的信号进行处理, 以消除所述信号中来自所述上行用户设备的 干扰信号。
2. 根据权利要求 1所述的处理干扰的方法, 其特征在于, 所述根据上 行用户设备使用的第一子载波携带的第一解调参考信号 DMRS导频符号, 测 量所述上行用户设备到设备到设备 D2D接收端的上行干扰信道的干扰信道矩 阵具体为:
根据上行用户设备可使用的 DMRS 导频序列的前 个符号, 和实际接收 到的第一 DMRS导频序列的前 个符号,计算所述第一 DMRS导频序列的长度; 根据所述第一 DMRS导频序列的长度计算所述第一 DMRS导频序列和第一 子带,所述第一子带由所述 D2D发射端和所述上行用户设备共用子载波组成; 从所述第一子带中选择所述第一子载波, 从所述第一 DMRS导频序列中 选择所述第一 DMRS导频符号;
根据所述第一子载波和所述第一 DMRS导频符号测量所述干扰信道矩阵。
3. 根据权利要求 2所述的处理干扰的方法, 其特征在于, 所述根据上 行用户设备可使用的 DMRS导频序列的前 个符号,和实际接收到的第一 DMRS 导频序列的前 个符号, 计算所述第一 DMRS导频序列的长度具体为:
根据公式 =ηώι |Γ-^ |计算 , 其中, 为所述上行用户设备可使 用的 DMRS导频序列的长度, 1≤ ≤«, w为具有不同长度的 DMRS导频序列的 种类数量, Γ为由实际接收到的所述第一 DMRS导频序列的前 个符号组成的 K*l维度的列向量, VL'为由所述上行用户设备可使用的 个长度为 Lt的 DMRS 导频序列的前 个符号组成的矩阵, ,..., ], 为长度为 的不 同 DMRS导频序列的个数, 为使 取最小值的 xl维度的列向量, EL' 为 的最小值;
根据公式 ; =argmini, EL-计算使 取最小值的 Lt, 所述 2;为所述第一
DMRS导频序列的长度。
4. 根据权利要求 2所述的处理干扰的方法, 其特征在于, 所述根据所 述第一 DMRS导频序列的长度计算所述第一 DMRS导频序列具体为:
根据公式 * = arg min Y-VL X计算使 Y-VL X取最小值的 ,其中, z:为 所述第一 DMRS导频序列的长度, 为长度为 的不同 DMRS导频序列的水 数, Γ为由实际接收到的所述第一 DMRS导频序列的前 个符号组成的 *1维 度的列向量, 和 T为 xl维度的列向量, ^=[ , ,...,0„/, 为由所述 上行用户设备可使用的 个长度为 的 DMRS 导频序列的前 个符号组成的 矩阵, =[ Vf ,V2 L',…, V ], V1' X* = xl Vf +x2 Vf +.. ,+ ,. Vf +...+xmV , l≤i≤m;
计算所述 中每个元素的模值, 取模值最小的元素 χ,.对应的 中的向 量 作为所述第一 DMRS导频序列。
5. 根据权利要求 1所述的处理干扰的方法, 其特征在于, 所述根据所 述上行干扰信道的干扰信道矩阵计算所述上行干扰信道的零空间矩阵具体 为: 根据公式 2*H = o计算所述零空间矩阵, 其中, ρ为所述零空间矩阵, Η 为所述干扰信道矩阵。
6. 根据权利要求 1所述的处理干扰的方法, 其特征在于, 所述利用所 述零空间矩阵对所述 D2D接收端通过所述第一子载波接收到的来自 D2D发射 端的信号进行处理, 以消除所述信号中来自所述上行用户设备的干扰信号具 体为: 将所述零空间矩阵与所述 D2D接收端通过所述第一子载波接收到的信 号相乘, 以消除所述信号中来自所述上行用户设备的干扰信号。
7. 根据权利要求 1所述的处理干扰的方法, 其特征在于, 所述根据上 行用户设备使用的第一子载波携带的第一解调参考信号 DMRS导频符号, 测 量所述上行用户设备到设备到设备 D2D接收端的上行干扰信道的干扰信道矩 阵之前还包括: 接收来自 D2D发射端的信号以及来自所述上行用户设备的信 号。
8. 根据权利要求 7所述的处理干扰的方法, 其特征在于, 接收到的来 自所述 D2D发射端的信号和来自所述上行用户设备的信号在时间上同歩并且
9. 根据权利要求 8所述的处理干扰的方法, 其特征在于, 接收到的来 自所述 D2D发射端的信号和来自所述上行用户设备的信号中的 DMRS导频序 列的位置不重合。
10. 根据权利要求 9所述的处理干扰的方法, 其特征在于, 接收到的来 自所述上行用户设备的信号中, 在有 DMRS导频序列的位置上, 对应的接收 到的来自所述 D2D发射端的信号在该位置上静默。
1 1. 一种处理干扰的装置, 其特征在于, 所述装置包括: 测量单元, 用于根据上行用户设备使用的第一子载波携带的第一解调参 考信号 DMRS导频符号, 测量所述上行用户设备到 D2D接收端的上行干扰信 道的干扰信道矩阵; 所述第一子载波为 D2D发射端和所述上行用户设备共用 子载波, 将所述上行干扰信道矩阵发送至计算单元;
计算单元, 用于接收所述测量单元发送的所述干扰信道矩阵, 根据所述 干扰信道矩阵计算所述上行干扰信道的零空间矩阵,将所述零空间矩阵发送 至处理单元;
处理单元, 用于接收所述计算单元发送所述零空间矩阵, 利用所述零空 间矩阵对所述 D2D接收端通过所述第一子载波接收到的来自 D2D发射端的信 号进行处理, 以消除所述信号中来自所述上行用户设备的干扰信号。
12. 根据权利要求 1 1 所述的处理干扰的装置, 其特征在于, 所述测量 单元具体包括:
第一计算子单元,用于根据上行用户设备可使用的 DMRS导频序列的前 个符号, 和实际接收到的第一 DMRS导频序列的前 个符号, 计算所述第一 DMRS导频序列的长度;
第二计算子单元, 用于根据所述第一 DMRS导频序列的长度计算所述第 一 DMRS导频序列和第一子带的位置, 所述第一子带由所述 D2D发射端和所 述上行用户设备共用子载波组成;
选择子单元, 用于从所述第一子带中选择所述第一子载波, 从所述第一
DMRS导频序列中选择所述第一 DMRS导频符号;
测量子单元, 用于根据所述第一子载波和所述第一 DMRS导频符号测量 所述干扰信道矩阵 <
13. 根据权利要求 12所述的处理干扰的装置, 其特征在于, 所述第一 计算子单元具体用于,
根据公式 =ηώι |Γ-^ |计算 , 其中, 为所述上行用户设备可使 用的 DMRS导频序列的长度, 1≤ ≤«, w为具有不同长度的 DMRS导频序列的 种类数量, Γ为由实际接收到的所述第一 DMRS导频序列的前 个符号组成 的 *1维度的列向量, VL'为由所述上行用户设备可使用的 m个长度为 Lt的 DMRS导频序列的前 个符号组成的矩阵, ν"·=[ν^,ν^,...,ν^, 为长度为 的 不同 DMRS导频序列的个数, 为使 取最小值的 xl维度的列向量, ^^为| -1^ |的最小值;
根据公式 =argmini, EL-计算使 取最小值的 Lt, 所述 2;为所述第一 DMRS导频序列的长度。
14. 根据权利要求 12所述的处理干扰的装置, 其特征在于, 所述第二 计算子单元根据公式 =argmin Y-VL X计算使 Y-VL X取最小值的 , 其 中, 为所述第一 DMRS导频序列的长度, 为长度为 的不同 DMRS导频序 列的个数, Γ为由实际接收到的所述第一 DMRS导频序列的前 个符号组成的 *l维度的列向量, 和 Τ为 xl维度的列向量, ^=[ , x„/, 为由 所述上行用户设备可使用的 个长度为 的 DMRS 导频序列的前 个符号组
Figure imgf000019_0001
以及
计算所述 中每个元素的模值, 取模值最小的元素 χ,.对应的 ^中的向 Wf作为所述第一 DMRS导频序列。
15. 根据权利要求 11 所述的处理干扰的装置, 其特征在于, 所述计算 单元根据公式 2*H = o计算所述零空间矩阵, 其中, ρ为所述零空间矩阵, Η 为所述干扰信道矩阵。
16. 根据权利要求 11 所述的处理干扰的装置, 其特征在于, 所述处理 单元将所述零空间矩阵与所述 D2D接收端通过所述第一子载波接收到的来自
D2D发射端的信号相乘, 以消除所述信号中来自所述上行用户设备的干扰信 号。
17. 根据权利要求 11 所述的处理干扰的装置, 其特征在于, 所述装置 还包括:
接收单元, 用于接收来自 D2D发射端的信号以及来自所述上行用户设备 的信号。
18. 根据权利要求 17所述的处理干扰的装置, 其特征在于, 所述接收 单元接收到的来自所述 D2D发射端的信号和来自所述上行用户设备的信号在 时间上同歩并且结构一致。
19. 根据权利要求 18所述的处理干扰的装置, 其特征在于, 所述接收 单元接收到的来自所述 D2D发射端的信号和来自所述上行用户设备的信号中 的 DMRS导频序列的位置不重合。
20. 根据权利要求 19所述的处理干扰的装置, 其特征在于, 所述接收 单元接收到的来自所述上行用户设备的信号中, 在有 DMRS导频序列的位置 上, 对应的接收到的来自所述 D2D发射端的信号在该位置上静默。
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