WO2015062069A1 - Procédé pour déterminer une indication de matrice de précodage, dispositif récepteur et dispositif émetteur - Google Patents

Procédé pour déterminer une indication de matrice de précodage, dispositif récepteur et dispositif émetteur Download PDF

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Publication number
WO2015062069A1
WO2015062069A1 PCT/CN2013/086414 CN2013086414W WO2015062069A1 WO 2015062069 A1 WO2015062069 A1 WO 2015062069A1 CN 2013086414 W CN2013086414 W CN 2013086414W WO 2015062069 A1 WO2015062069 A1 WO 2015062069A1
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WO
WIPO (PCT)
Prior art keywords
codebook
order
precoding matrix
rank
indication information
Prior art date
Application number
PCT/CN2013/086414
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English (en)
Chinese (zh)
Inventor
刘建琴
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380008900.4A priority Critical patent/CN104782070B/zh
Priority to PCT/CN2013/086414 priority patent/WO2015062069A1/fr
Publication of WO2015062069A1 publication Critical patent/WO2015062069A1/fr

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Classifications

    • 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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • 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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a method, a receiving device, and a sending device for determining a precoding matrix indication.
  • MIMO multiple input multiple output
  • y is the received signal vector
  • H is the channel matrix
  • precoding matrix is the precoding matrix
  • s is the transmitted symbol vector
  • N is the measurement noise.
  • Optimal precoding usually requires the transmitter to fully know the Channel State Information (CSI).
  • CSI Channel State Information
  • the user equipment quantizes and reports the instantaneous CSI to the base station.
  • the receiving device for example, the UE
  • the user equipment includes a mobile station (MS), a relay, a mobile telephone, a handset, and a portable device.
  • the base station includes a Node B (NodeB) base station (Base station). , BS), Access Point, Transmission Point (TP), Evolved Node B (eNB) or Relay (Relay).
  • the CSI information reported by the existing Long Term Evolution (LTE) system includes a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI) information.
  • RI and PMI indicate the number of transport layers used and Encoding matrix.
  • the precoding matrix indicates the correspondence between the PMI and the precoding matrix.
  • precoding matrix indicates PMI
  • codebook table of each complex value component.
  • indicator numbers indicates PMI
  • a set of precoding matrices used is generally referred to as a codebook, where each precoding matrix is a codeword in a codebook.
  • FIG. 1 is a schematic structural view of a one-dimensional linear array antenna.
  • the distribution of the linear array antenna shown in FIG. 1 includes only one direction, which is generally referred to as a horizontal direction.
  • 2 is a schematic structural view of a two-dimensional array antenna. As shown in FIG. 2, the distribution of the two-dimensional array antenna includes two directions of horizontal direction and vertical direction.
  • the codebook needs to be designed as a horizontal, vertical combined three-dimensional (3D) codebook W.
  • the horizontal direction codebook, W e2 is the vertical codebook constituting W2. .
  • the embodiment of the present invention provides a method for determining a precoding matrix indication, a receiving device, and a transmitting device, to overcome the prior art method for determining a 3D codebook of a two-dimensional area array antenna, which has low precision, and thus has low precoding precision.
  • the problem is a problem.
  • an embodiment of the present invention provides a method for determining a precoding matrix indication, including: a receiving device, according to a reference signal sent by a sending device, selecting a precoding matrix W from a codebook, where the precoding matrix W is a direct product or a product of the first codebook W1 and the second codebook W2, wherein the order Rank (Wl) of the first codebook W1 is greater than or equal to the order Rank of the second codebook W2 (W2) ;
  • the receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.
  • the order of the second codebook W2 is Rank (W2) Is 1.
  • the channel state indication information comprising: a first precoding matrix indicator indicator codebook W1 i a And an indicator i e indicated by the precoding matrix of the second codebook W2 ;
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information, including:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines, according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order. Determining the order of the first codebook W1 and the order of the second codebook W2, and determining the precoding matrix according to the order of the first codebook W1 and the order of the second codebook W2 W.
  • the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i a And an indicator i e indicated by the precoding matrix of the second codebook W2, a channel quality information indicator CQI, an order Rank (W1 ) of the first codebook W1, and a total order of the precoding matrix W;
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information, including:
  • the sending device sends, by the receiving device, the channel state indication information to the sending device, so that the sending device determines, according to the order of the first codebook W1, Rank (W1), and the total order of the precoding matrix W.
  • the order of the second codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the method before the receiving device sends the channel state indication information to the sending device, the method includes:
  • the receiving device jointly encodes the indicator i a indicated by the precoding matrix corresponding to the first codebook with the order Rank (W1 ) of the first codebook W1, and the second codebook W2
  • the indicator i e indicated by the precoding matrix is jointly encoded with the CQI.
  • the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i a An indicator i e indicated by the precoding matrix of the second codebook W2, the CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;
  • the receiving device sends channel state indication information to the sending device, so that the sending device Determining the precoding matrix w according to the channel state indication information, including: the receiving device sending the channel state indication information to the sending device, so that the sending device is configured according to the second codebook W2
  • the order Rank (W2) and the total order of the precoding matrix W determine the order Rank(W1) of the first codebook W1, and according to the order of the first codebook W1 and the second The order of the codebook W2 determines the precoding matrix W.
  • the method before the receiving device sends the channel state indication information to the sending device, the method includes:
  • the receiving device jointly encodes the indicator i e indicated by the precoding matrix corresponding to the second codebook with the order Rank (W2 ) of the second codebook W2, and the first codebook W1 is
  • the indicator i a indicated by the precoding matrix is jointly encoded with the CQI.
  • the channel state indication information includes: a quantized value of a combination of an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information, including:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2
  • the combined quantized value of (W2) determines the order Rank (Wl) of the first codebook W1 and the order Rank (W2) of the second codebook W2, and according to the order of the first codebook W1
  • the number and the order of the second codebook W2 determine the precoding matrix W.
  • the channel state indication information further includes: a total order of the precoding matrix W;
  • the receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2
  • the combined quantized value of (W2) determines the order Rank of the first codebook W1 (Wl) and the order of the second codebook W2, including:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2
  • the combined value of (W2) and the total order of the precoding matrix W determine the first code
  • the channel state indication information includes: an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information, including:
  • the receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix w according to the order of the first codebook W1 and the order of the second codebook W2. .
  • the channel state indication information includes: a total order of the precoding matrix w. ;
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the indication information, including:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines the first codebook according to a total order of the precoding matrix w and antenna configuration information of the sending device.
  • the precoding matrix W, wherein the antenna configuration information of the transmitting device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.
  • the first codebook W1 and the second code The W2 is selected from the 2-antenna codebook, the 4-antenna codebook, or the 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.
  • LTE Long Term Evolution
  • an embodiment of the present invention provides a method for determining a precoding matrix indication, including: sending, by a sending device, a reference signal to a receiving device;
  • the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information, where the precoding matrix W is a product or a direct product of two matrices W1 and W2 ,
  • the order Rank (W1 ) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.
  • the second rank W2 has a rank Rank (W2) of 1.
  • the channel state indication information comprising: a first precoding matrix indicator indicator codebook W1 i a And an indicator i e indicated by the precoding matrix of the second codebook W2 ;
  • Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information including:
  • the transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the channel state indication information includes: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, a channel quality information indicator CQI, the foregoing An order Rank of a codebook W1 (W1) and a total order of the precoding matrix W;
  • Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information including:
  • the transmitting device determines the order Rank (W2) of the second codebook W2 according to the order Rank (W1) of the first codebook W1 and the total order of the precoding matrix W;
  • the transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the channel state indication information includes: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, the CQI, and the second codebook The order Rank of W2 (W2) and the total order of the precoding matrix W; Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information, including:
  • the transmitting device determines the order Rank (W1) of the first codebook W1 according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W;
  • the transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the channel state indication information includes: a quantized value of a combination of an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information including:
  • the transmitting device determines the order of the first codebook W1 according to the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 Rank (W1) and the order of the second codebook W2 Rank (W2);
  • the transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the channel state indication information further includes: a total order of the precoding matrix W;
  • the transmitting device determines the order of the first codebook W1 according to the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 Rank (W1) and the order Rank (W2) of the second codebook W2, including:
  • the transmitting device is based on a combination of the quantization value of the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) and the total order of the precoding matrix W Determining the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) o
  • the channel state indication information includes: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2; Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information, including:
  • the transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the channel state indication information includes: a total order of the precoding matrix W;
  • Determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal according to the channel state indication information including:
  • the transmitting device Determining, by the transmitting device, the order Rank (W1) of the first codebook W1 and the order of the second codebook W2 according to a total order of the precoding matrix W and antenna configuration information of the transmitting device Rank (W2) o, wherein the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type;
  • the transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the first codebook W1 and the second codebook W2 is selected from a 2-antenna codebook, a 4-antenna codebook, or an 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.
  • LTE Long Term Evolution
  • an embodiment of the present invention provides a receiving device, including:
  • a receiving module configured to select a precoding matrix W from the codebook based on a reference signal sent by the sending device, where the precoding matrix W is a product or a direct product of the first codebook W1 and the second codebook W2.
  • the order of the first codebook W1, Rank (W1), is greater than or equal to the order of the second codebook W2 (W2);
  • a sending module configured to send channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.
  • the second rank W2 has a rank Rank (W2) of one.
  • the channel state indication information includes: a precoding matrix indicated by the first codebook W1 An indicator i a of the indicator i a and the precoding matrix of the second codebook W2 ;
  • the sending module is specifically configured to:
  • the sending device determines the first code according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order
  • the order of the W1 and the order of the second codebook W2 are determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i a And an indicator i e indicated by the precoding matrix of the second codebook W2, a channel quality information indicator CQI, an order Rank(W1) of the first codebook W1, and a total order of the precoding matrix W;
  • the sending module is specifically configured to:
  • the sending device determines the second according to the order Rank of the first codebook W1, Rank (W1), and the total order of the precoding matrix W.
  • the order of the codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the method further includes:
  • An encoding module configured to: before the receiving device sends the channel state indication information to the sending device, the indicator indicated by the precoding matrix corresponding to the first codebook and the order of the first codebook W1 Rank (W1) performs joint coding, and jointly encodes the indicator i e indicated by the precoding matrix of the second codebook W2 with the CQI.
  • the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i a An indicator i e indicated by the precoding matrix of the second codebook W2, the CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;
  • the sending module is specifically configured to:
  • the method further includes:
  • An encoding module configured to: before the receiving device sends the channel state indication information to the sending device, the indicator i e indicated by the precoding matrix corresponding to the second codebook and the second codebook W2
  • the number Rank (W2) performs joint coding, and the indicator i a indicated by the precoding matrix of the first codebook W1 is jointly encoded with the CQI.
  • the channel state indication information includes: a quantized value of a combination of an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the sending module is specifically configured to:
  • the combined quantized value determines the order of the first codebook W1, Rank (W1), and the order of the second codebook W2, and according to the order of the first codebook W1 and the second codebook
  • the order of W2 determines the precoding matrix W.
  • the channel state indication information further includes: a total order of the precoding matrix w;
  • the sending module is specifically configured to:
  • the channel state indication information includes: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the sending module is specifically configured to:
  • the sending device determines the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes: a total order of the precoding matrix w;
  • the sending module is specifically configured to:
  • the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.
  • the first codebook W1 and the second code The W2 is selected from the 2-antenna codebook, the 4-antenna codebook, or the 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.
  • LTE Long Term Evolution
  • an embodiment of the present invention provides a sending device, including:
  • a sending module configured to send a reference signal to the receiving device
  • a receiving module configured to receive channel state indication information sent by the receiving device
  • a processing module configured to determine, according to the channel state indication information, a precoding matrix W selected by the receiving device from a codebook based on a reference signal, where the precoding matrix W is a product or a straight line of two matrices W1 and W2 Product,
  • the order of the first codebook W1, Rank (W1), is greater than or equal to the second codebook.
  • the second rank W2 has a rank Rank (W2) of 1.
  • the channel state indication information comprising: a first precoding matrix indicator indicator codebook W1 i a And an indicator i e indicated by the precoding matrix of the second codebook W2 ;
  • the processing module is specifically configured to:
  • the device Determining the receiving according to the order of the first codebook W1 and the order of the second codebook W2
  • the device is based on the precoding matrix w selected from the codebook based on the reference signal.
  • the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i a And an indicator i e indicated by the precoding matrix of the second codebook W2, a channel quality information indicator CQI, an order Rank (W1) of the first codebook W1, and a total order of the precoding matrix W;
  • the processing module is specifically configured to:
  • the precoding matrix w selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes: an indicator indicated by a precoding matrix corresponding to the first codebook i a An indicator i e indicated by the precoding matrix of the second codebook W2, the CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;
  • the processing module is specifically configured to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes: an order Rank (Wl) of the first codebook W1 and a combined quantized value of the order Rank (W2) of the second codebook W2;
  • the processing module is specifically configured to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information further includes: a total order of the precoding matrix W;
  • the processing module is specifically configured to:
  • the channel state indication information includes: an order Rank (Wl) of the first codebook W1 and The order of the second codebook W2 Rank (W2) ;
  • the processing module is specifically configured to:
  • the precoding matrix w selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes: a total order of the precoding matrix w;
  • the processing module is specifically configured to:
  • the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type;
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the first codebook W1 and the second codebook W2 is selected from a 2-antenna codebook, a 4-antenna codebook, or an 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.
  • LTE Long Term Evolution
  • the method for determining the precoding matrix indication, the receiving device, and the sending device provided by the embodiment of the present invention, the order of the first codebook W1 being greater than or equal to the order of the second codebook can ensure that the order of the final precoding matrix W is Very good approximation and simulation. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of precoding, thereby reducing performance loss and improving system throughput.
  • 1 is a schematic structural view of a one-dimensional linear array antenna
  • FIG. 2 is a schematic structural view of a two-dimensional array antenna
  • Embodiment 3 is a flowchart of Embodiment 1 of a method for determining a precoding matrix indication according to the present invention
  • Embodiment 4 is a flowchart of Embodiment 2 of a method for determining a precoding matrix indication according to the present invention
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of a receiving device according to the present invention.
  • Embodiment 2 of a receiving device according to the present invention.
  • Embodiment 7 is a schematic structural diagram of Embodiment 1 of a transmitting device according to the present invention.
  • FIG. 8 is a schematic structural diagram of hardware of Embodiment 3 of a receiving device according to the present invention.
  • FIG. 9 is a schematic structural diagram of hardware of a second embodiment of a transmitting device according to the present invention.
  • FIG. 10 is a schematic structural diagram of an embodiment of a communication system according to the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
  • the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • Advanced Long Advanced Long
  • UMTS Universal Mobile Telecommunication System
  • the user equipment (User Equipment, UE for short) includes but is not limited to a mobile station (Mobile Station, MS for short), a relay (Relay), and a mobile terminal (Mobile). Terminal, mobile phone, mobile device (Handset) and portable device (Portable Equipment), etc., the user equipment can communicate with one or more core networks via a radio access network (Radio Access Network, RAN)
  • RAN Radio Access Network
  • the user device may be a mobile phone (or "cellular" phone), a computer with wireless communication capabilities, etc., and the user device may also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • the base station may be a base station (Base Transceiver Station, BTS for short) in GSM or CDMA, or a base station (NodeB, NB for short) in WCDMA, or an evolved base station in LTE.
  • BTS Base Transceiver Station
  • NodeB NodeB
  • NB base station
  • LTE Long Term Evolution
  • a multi-antenna system refers to a system in which a transmitting device and a receiving device communicate through a plurality of antennas.
  • the sending device when the sending device is a base station, the receiving device is a UE; otherwise, when the sending device is a UE, the receiving device is a base station.
  • multiple antennas of the transmitting device and the receiving device can form a spatial diversity gain or a multiplexing gain, which can effectively improve transmission reliability and system capacity.
  • the diversity gain and multiplexing gain in a multi-antenna system can generally be obtained by a precoding method of the transmitting device and a receiving combining algorithm of the receiving device.
  • the multi-antenna system of the embodiment of the present invention can be applied to a single-point transmission scenario, that is, a transmission scenario of a transmitting device and a receiving device. It can also be applied to the scenario of multi-point joint transmission.
  • Multi-point joint transmission refers to the joint transmission of signals by multiple transmitting devices to the same receiving device. For example, transmitting device A has 2 antennas, and transmitting device B also has 2 antennas, two The transmitting devices simultaneously perform joint transmission on the receiving device. Then the signal received by the receiving device can be regarded as a signal transmitted by a 4-antenna base station.
  • FIG. 3 is a flowchart of Embodiment 1 of a method for determining a precoding matrix indication according to the present invention.
  • the executor of this embodiment is a receiving device, which may be a base station or a UE.
  • the sending device may be a UE.
  • the sending device may be a base station.
  • the method in this embodiment may include:
  • Step 301 The receiving device selects a precoding matrix W from the codebook according to the reference signal sent by the sending device, where the precoding matrix W is a direct product or a product of the first codebook W1 and the second codebook W2.
  • the order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.
  • the first codebook W1 may be a codebook representing a horizontal antenna
  • the second code This W2 can be a codebook representing a vertical antenna.
  • the first codebook W1 and the second codebook W2 are selected, the first codebook W1 representing the horizontal direction can be selected as the codebook with higher order, and the second codebook W2 representing the vertical direction can be selected. It is a codebook with a lower order. Specifically, it is assumed that the 3D codebook to be constructed, that is, the precoding matrix W, has an order of R, the order of the first codebook W1 is s, and the order of the second codebook W2 is t, and s ⁇ t is defined. .
  • the 3D codebook of order 6 is W
  • W is the product or direct product of W1 and W2
  • first codebook W1 and the second codebook W2 are respectively selected from a 2-antenna codebook, a 4-antenna codebook or an 8-antenna codebook of the Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the matrix W1 may be a matrix representing broadband channel characteristics, and the matrix W2 may be a matrix representing channel characteristics of subbands; or, the matrix W1 may be a matrix representing long-term channel characteristics, and the matrix W2 may be a matrix representing short-term channel characteristics. .
  • the first codebook W1 may be a 3rd order Rel-10 codebook
  • the second codebook W2 may be a 2nd order Rel-10 codebook. this.
  • the order Rank (W1) of the second codebook W2 may also be limited to 1. That is, the 3D codebook of any order (set to R order) can be generated by a direct product of the second codebook W2 perpendicular to the 1st order and the first codebook W1 codebook of the horizontal R order.
  • Step 302 The receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.
  • the sending device may obtain the precoding matrix W of the antenna array of the receiving device according to the relationship between the PMI and the precoding matrix specified in the 3GPP according to the track state indication information.
  • the type of the reference signal in 301 is not limited in the embodiment of the present invention.
  • it may be a Channel State Information Reference Signal (CSI RS), a Demodulation Reference Signal (Demodulation RS, DM RS), or a Cell-Specific RS (CRS).
  • the CSI may also include Channel Quality Indicator/Index (CQI).
  • the UE may receive a base station notification (for example, Radio Resource Control (RRC) signaling or downlink control.
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • resource configuration of the reference signal based on the cell identifier ID and obtain a reference signal in the corresponding resource or subframe.
  • the W passes the product of the first codebook W1 and the second codebook W2 or Constructed to be able to represent the characteristics of the three-dimensional beam vector in the codebook, so the constructed precoding matrix W can be used as a 3-dimensional (3D) codebook; and by defining the order Rank of the first codebook W1 (W1) is greater than or equal to the order Rank (W2) of the second codebook W2 such that the constructed 3D codebook W conforms to the characteristic that the antenna is less than the horizontal expansion angle at the vertical expansion angle, and therefore, the constructed 3D
  • the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of the precoding, thereby reducing performance loss and improving the system. Throughput.
  • step 302 after the receiving device determines the 3D codebook W, the receiving device feeds back the channel state indication information to the sending device, so that the sending device determines the location according to the channel state indication information.
  • the process of describing the 3D codebook W can be implemented in the following six ways.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix of the first codebook W1 and an indicator i e indicated by a precoding matrix of the second codebook W2 ;
  • the step 302 may be specifically: the receiving device sends the channel state indication information to the sending device, so that the sending device indicates the indicator and the codebook level according to a preset rule or a preset precoding matrix.
  • the mapping relationship of the number determines the order of the first codebook W1 and the order of the second codebook W2, respectively, and according to the order of the first codebook W1 and the order of the second codebook W2 The number determines the precoding matrix W.
  • the sending device and the receiving device need to agree on a preset rule in advance, or pre-agreed the mapping relationship between the indicator indicated by the precoding matrix and the codebook order. Therefore, when the receiving device feeds back the channel state indication information, The order of the first codebook W1 and the second codebook W2 may not be directly fed back, but only the indicator i a of the precoding matrix indication of the first codebook W1 and the precoding matrix indication of the second codebook W2 may be fed back.
  • the indicator i e may be, after the receiving device receives the ⁇ and i e , the order of the first codebook W1 and the second codebook W2 may be implicitly obtained, so that the receiving device does not increase the transmission to the transmitting device.
  • the indicator indicated by the precoding matrix may be the indicator i after all the codebooks concatenated, for example, the codebook indicator of order 1 is 0 to Il-1 , the codebook indicator of order 2 is il-1 to il+i2-2, where il is the number of codebooks of order 1, i2 is the number of codebooks of order 2, and so on.
  • Table 2 The mapping relationship is shown in Table 2.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, and a channel a quality information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W;
  • Step 302 may specifically be:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines, according to the order Rank of the first codebook W1, Rank (W1), and the total order of the precoding matrix W.
  • the order of the second codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • Rank (W2) the total order of the precoding matrix W, Rank (W) / Rank (Wl).
  • the method may include:
  • the receiving device jointly encodes the indicator i a indicated by the precoding matrix corresponding to the first codebook with the order Rank (W1 ) of the first codebook W1, and the second codebook W2
  • the indicator i e indicated by the precoding matrix is jointly encoded with the CQI.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, a CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;
  • Step 302 may specifically be:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines, according to the order Rank of the second codebook W2, Rank (W2) and the total order of the precoding matrix W.
  • the order of the first codebook W1 is Rank (W1)
  • the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the method may include:
  • the receiving device jointly encodes the indicator i e indicated by the precoding matrix corresponding to the second codebook with the order Rank (W2 ) of the second codebook W2, and the first codebook W1 is
  • the indicator i a indicated by the precoding matrix is jointly encoded with the CQI.
  • the channel state indication information may include: a combination of the order of the first codebook W1, Rank (W1), and the order of the second codebook, W2, Rank (W2) value.
  • Rank (W2) may be represented by various quantized values, for example, for a total order of 6.
  • step 302 may specifically be:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device is based on the order Rank of the first codebook W1 (W1) and the order of the second codebook W2, Rank The combined quantized value of (W2) determines the order Rank of the first codebook W1 (W1) and the order of the second codebook W2, and according to the order of the first codebook W1 and the The order of the second codebook W2 determines the precoding matrix W.
  • the channel state indication information may be in addition to the quantized value including the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2.
  • the method includes: a total order of the precoding matrix W.
  • the first code determined by the transmitting device to further verify a combined quantized value according to a combination of the order Rank(W1) of the first codebook W1 and the order Rank(W2) of the second codebook W2
  • the channel state indication information includes: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2.
  • the receiving device does not feed back the total order of the precoding matrix W, and directly feeds back the order Rank (W1) of the first codebook W1 and the order Rank (Wl) of the second codebook W2,
  • the transmitting device receives the channel state indication information, and obtains the total order of the precoding matrix W according to Rank (Wl) XRank (Wl).
  • step 302 may specifically be:
  • the receiving device sends channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2. .
  • the channel state indication information may include: a total order of the precoding matrix W.
  • Step 302 may specifically be:
  • the receiving device sends the channel state indication information to the sending device, so that the sending device determines the first codebook according to a total order of the precoding matrix W and antenna configuration information of the sending device.
  • the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.
  • the number of the first antenna ports refers to the number of horizontal antenna ports of the transmitting device, and the number of the second antenna ports refers to the number of vertical antenna ports of the transmitting device.
  • the antenna configuration information of the receiving device can be sent to the sending device before step 302 or simultaneously with step 302, so that the sending device can be based on the horizontal antenna port number and the vertical antenna of the transmitting device.
  • the number of ports determines the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2. For example, when the total order of the precoding matrix W is 4, and the number of horizontal antenna ports is 4, the number of vertical antenna ports is 2, and the antenna polarization type is cross polarization, because of the cross antenna of the 2 antenna ports
  • the order is usually 1, so the default first codebook W1 has an order of 4, and the second codebook W2 has an order of 1.
  • the foregoing six receiving devices send channel state indication information to the sending device, so that the sending device determines any one of the manners of the precoding matrix w according to the indication information, and feeds back the first codebook W1.
  • the number of bits may be the same as the number of feedback bits of the horizontal codebook of the same number of antenna ports in Rel-8, Rel-9 or Rel-10, or may be larger than the same antenna port in Rel-8, Rel-9 or Rel-10
  • the number of feedback bits of the codebook is not limited here.
  • the number of bits required to feed back the second codebook W2 may be the same as the number of feedback bits of the codebook of the same number of antenna ports in Rel-8, Rel-9 or Rel-10, or may be greater than Rel-8, Rel-9 or Rel
  • the number of feedback bits of the codebook of the same number of antenna ports in the -10 is not limited herein.
  • the receiving device feeds back to the transmitting device the order of the first codebook W1 constituting the 3D codebook and the second codebook W2 without increasing the number of feedback bits.
  • the order is such that the transmitting device obtains the first codebook W1 and the second codebook W2, thereby determining the 3D codebook W by directly integrating the first codebook W1 and the second codebook W2.
  • FIG. 4 is a flowchart of Embodiment 2 of a method for determining a precoding matrix indication according to the present invention.
  • the executor of this embodiment is a transmitting device, which may be a base station or a UE.
  • the sending device is a base station
  • the receiving device may be a UE.
  • the sending device is a UE
  • the receiving device may be a base station.
  • the method in this embodiment may include:
  • Step 401 The sending device sends a reference signal to the receiving device.
  • the type of the reference signal may be a Channel State Information Reference Signal (CSI RS), a Demodulation Reference Signal (Demodulation RS, DM RS ), or a Cell-Specific Reference Signal (CRS).
  • CSI can also include Channel Quality Indicator/Index (CQI).
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the reference signal is obtained in the corresponding resource or the subframe, which is not limited by the embodiment of the present invention.
  • Step 402 The sending device receives channel state indication information sent by the receiving device.
  • Step 403 The sending device determines, according to the channel state indication information, a precoding matrix W selected by the receiving device from a codebook based on a reference signal, where the precoding matrix W is a product of two matrices W1 and W2. Or direct product, wherein the order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.
  • the first codebook W1 may be a codebook that represents a horizontal antenna
  • the second codebook W2 may be a codebook that represents a vertical antenna.
  • the first codebook W1 and the second codebook W2 are selected, the first codebook W1 representing the horizontal direction can be selected as the codebook with higher order, and the second codebook W2 representing the vertical direction can be selected. It is a codebook with a lower order. Specifically, it is assumed that the 3D codebook to be constructed, that is, the order of the precoding matrix W is R, the order of the first codebook W1 is s, and the order of the second codebook W2 is t, then s ⁇ t is defined.
  • the 3D codebook of order 6 is W
  • W is the direct product of W1 and W2
  • first codebook W1 and the second codebook W2 are respectively selected from a 2-antenna codebook, a 4-antenna codebook or an 8-antenna codebook of the Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the matrix W1 may be a matrix representing broadband channel characteristics, and the matrix W2 may be a matrix representing channel characteristics of subbands; or, the matrix W1 may be a matrix representing long-term channel characteristics, and the matrix W2 may be a matrix representing short-term channel characteristics. .
  • the first codebook W1 may be a 3rd order Rel-10 codebook
  • the second codebook W2 may be a 2nd order Rel-10 codebook. this.
  • the order Rank (W2) of the second codebook W2 may be limited to 1. That is, the 3D codebook of any order (set to R order) can be vertically oriented The second codebook W2 of the 1st order and the direct product of the first codebook W1 codebook whose horizontal direction is the Rth order are generated.
  • the sending device may obtain a precoding matrix ⁇ of the antenna array of the receiving device according to the relationship between the PMI and the precoding matrix specified in the 3GPP according to the track state indication information.
  • the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the received channel state indication information, and the precoding matrix w selected by the transmitting device is represented by a direct product or a product of the horizontal first codebook W1 and the second codebook W2 representing the vertical direction, so that the characteristics of the three-dimensional beam vector can be expressed in the codebook, and thus the precoding matrix W can be used as a 3D code
  • the precoding matrix W can be used as a 3D code
  • the order Rank(W1) of the first codebook W1 to be greater than or equal to the order Rank(W2) of the second codebook W2, so that the 3D codebook W conforms to the antenna in the vertical direction.
  • the angle is smaller than the horizontal expansion angle.
  • the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively Improve the accuracy of precoding, thereby reducing performance loss and increasing system throughput.
  • the sending device receives channel state indication information sent by the receiving device, and step 403, the sending device determines, according to the channel state indication information,
  • the precoding matrix W selected by the receiving device from the codebook based on the reference signal can be implemented in the following six manners.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix of the first codebook W1 and an indicator i e indicated by a precoding matrix of the second codebook W2 ;
  • the determining, by the sending device, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, according to the channel state indication information includes:
  • Step 1 The sending device determines the order of the first codebook W1 and the second codebook according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order.
  • Step 2 The transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the sending device and the receiving device need to agree on a preset rule in advance, or pre-agreed the mapping relationship between the indicator indicated by the precoding matrix and the codebook order. Therefore, when the receiving device feeds back the channel state indication information, Can not directly feedback the first codebook W1 and the second codebook W2 The order, but only the indicator i a of the precoding matrix indication of the first codebook W1 and the indicator i e of the precoding matrix of the second codebook W2 need to be fed back, and the transmitting device receives the ⁇ and After i e , the order of the first codebook W1 and the second codebook W2 may be implicitly obtained, so that the number of bits of the channel state indication information transmitted by the receiving device to the transmitting device is not increased.
  • the indicator indicated by the precoding matrix may be the indicator i after all the codebooks concatenated, for example, the codebook indicator of order 1 is 0 to Il-l, the codebook indicator of order 2 is il-1 to il+i2-2, where il is the number of codebooks of layer 1, and i2 is the number of codebooks of layer 2, and so on.
  • the codebook number of the codebook of the order is cascaded, and then the mapping relationship between the horizontal codebook indicator and the corresponding order can be established, as shown in Table 1 above, and the vertical codebook indicator and the corresponding order
  • the mapping relationship is as shown in Table 2 above.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, and a channel a quality information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W.
  • the sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, and includes:
  • Step 1 The sending device determines the order Rank (W2) of the second codebook W2 according to the order Rank (Wl) of the first codebook W1 and the total order of the precoding matrix W;
  • Step 2 The transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the method may include:
  • the receiving device jointly encodes the indicator i a indicated by the precoding matrix corresponding to the first codebook with the order Rank (W1 ) of the first codebook W1, and the second codebook W2
  • the indicator i e indicated by the precoding matrix is jointly encoded with the CQI.
  • the channel state indication information may include: a first code indicating a precoding matrix corresponding to the indicator of the present i a, i e the second indicator code indicating the precoding matrix W2 is present, the The CQI, the order Rank of the second codebook W2, Rank (W2), and the total order of the precoding matrix W.
  • the sending device determines, according to the channel state indication information, the receiving device in step 403.
  • the precoding matrix w selected from the codebook based on the reference signal includes:
  • Step 1 The transmitting device determines the order Rank (W1) of the first codebook W1 according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W;
  • Step 2 The transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the method may include:
  • the receiving device jointly encodes the indicator i e indicated by the precoding matrix corresponding to the second codebook with the order Rank (W2 ) of the second codebook W2, and the first codebook W1 is
  • the indicator i a indicated by the precoding matrix is jointly encoded with the CQI.
  • the channel state indication information may include: a combination of the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) value.
  • the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2 may be represented by various quantized values, for example, for a total order of 6.
  • the sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, according to the channel state indication information, including:
  • Step 1 The sending device determines the first codebook W1 according to the combined quantized value of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2.
  • Step 2 The transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the channel state indication information is not only the quantized value including the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2), It may also include: a total order of the precoding matrix w.
  • the first code determined by the transmitting device to further verify a combined quantized value according to a combination of the order Rank(W1) of the first codebook W1 and the order Rank(W2) of the second codebook W2 The correctness of the order Rank of the W1 (W1) and the order of the second codebook W2, Rank (W2).
  • the channel state indication information includes: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2.
  • the receiving device does not feed back the total order of the precoding matrix W, but directly feeds back the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2,
  • the transmitting device receives the channel state indication information, and obtains the total order of the precoding matrix W according to Rank (Wl) XRank (W2).
  • the sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, including:
  • the transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the channel state indication information may include: a total order of the precoding matrix W.
  • the sending device determines, according to the channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, including:
  • Step 1 The sending device determines, according to the total order of the precoding matrix W and the antenna configuration information of the sending device, the order Rank (Wl) of the first codebook W1 and the second codebook W2.
  • the order of Rank (W2) includes: a first day line port number, a second antenna port number, and an antenna polarization type;
  • Step 2 The transmitting device determines, according to the order of the first codebook W1 and the order of the second codebook W2, the precoding matrix W selected by the receiving device from the codebook based on the reference signal.
  • the sending device may determine the order Rank of the first codebook W1 (Wl) and the second codebook W2 according to the horizontal number of the transmitting device and the number of the vertical antenna ports.
  • Order Rank (W2) may be determined according to the horizontal number of the transmitting device and the number of the vertical antenna ports.
  • the foregoing six types of sending devices receive the channel state indication information sent by the receiving device, and the sending device determines any one of the manners of the precoding matrix W according to the indication information, and feeds back the first codebook W1.
  • the number of bits can be the same as the antenna port in Rel-8, Rel-9 or Rel-10
  • the number of feedback bits of the codebook of the same number is the same, and may be greater than the number of feedback bits of the codebook of the same number of antenna ports in Rel-8, Rel-9, or Rel-10, which is not limited herein.
  • the number of bits required to feed back the second codebook W2 to feed back the first codebook W1 may be the same as the number of feedback bits of the codebook of the same number of antenna ports in Rel-8, Rel-9 or Rel-10,
  • the number of feedback bits of the codebook that can be greater than the number of the same antenna port in Rel-8, Rel-9, or Rel-10 is not limited herein.
  • the receiving device feeds back to the transmitting device the order of the first codebook W1 constituting the 3D codebook and the second codebook W2 without increasing the number of feedback bits.
  • the order whereby the transmitting device obtains the first codebook W1 and the second codebook W2, and the transmitting device determines the 3D codebook w by directly integrating the first codebook W1 and the second codebook W2.
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of a receiving device according to the present invention.
  • the receiving device in this embodiment may be a base station or a terminal.
  • the receiving device 500 of this embodiment may include: a receiving module 11 and a sending module 12, where
  • the receiving module 11 may be configured to select a precoding matrix W from the codebook based on a reference signal sent by the sending device, where the precoding matrix W is a product or a direct product of the first codebook W1 and the second codebook W2. ,
  • the order of the first codebook W1, Rank (W1), is greater than or equal to the order of the second codebook W2 (W2);
  • the sending module 12 may be configured to send channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.
  • the receiving device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3, and the implementation principle thereof is similar, and details are not described herein again.
  • the receiving device of this embodiment selects the precoding matrix W from the codebook based on the reference signal transmitted by the transmitting device, by using the first codebook W1 representing the horizontal direction and the second codebook W2 representing the vertical codebook. Constructed to be able to represent the characteristics of the three-dimensional beam vector in the codebook, so the constructed precoding matrix W can be used as a 3-dimensional (3D) codebook; and by defining the order Rank of the first codebook W1 (W1) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the constructed 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and thus, the constructed The accuracy of the 3D codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the precision of the precoding, thereby reducing performance loss and improving the throughput of the system.
  • this embodiment may also have the following six specific implementation manners.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix of the first codebook W1 and an indicator i e indicated by a precoding matrix of the second codebook W2 ;
  • the sending module 12 can be specifically used to:
  • the sending device determines the first code according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order
  • the order of the W1 and the order of the second codebook W2 are determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, and a channel a quality information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W;
  • the sending module 12 can be specifically configured to:
  • the sending device determines the second according to the order Rank of the first codebook W1 (W1) and the total order of the precoding matrix W.
  • the order of the codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • FIG. 6 is a schematic structural diagram of Embodiment 2 of a receiving device according to the present invention.
  • the receiving device 600 of the present embodiment based on the receiving device shown in FIG. 5, further includes: an encoding module 13 for the second specific implementation manner.
  • the encoding module 13 may be configured to: before the receiving device sends the channel state indication information to the sending device, the indicator indicated by the precoding matrix corresponding to the first codebook and the first codebook W1
  • the order Rank (W1) is jointly coded, and the indicator i e indicated by the precoding matrix of the second codebook W2 is jointly encoded with the CQI.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, a CQI, an order Rank of the second codebook W2 (W2), and a total of the precoding matrix W Order;
  • the sending module 12 can be specifically configured to:
  • the sending device determines the first according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W
  • the order of the codebook W1 is Rank (W1)
  • the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the third implementation manner may also adopt the structure of the receiving device shown in FIG. 6, that is, the method further includes: an encoding module 13,
  • the encoding module 13 is configured to: after the receiving device sends the channel state indication information to the sending device, the indicator i e indicated by the precoding matrix corresponding to the second codebook and the second The order Rank (W2) of the codebook W2 is jointly encoded, and the indicator i a indicated by the precoding matrix of the first codebook W1 is jointly encoded with the CQI.
  • the channel state indication information may include: a combination of the order of the first codebook W1, Rank (W1), and the order of the second codebook, W2, Rank (W2) Value
  • the sending module 12 can be specifically configured to:
  • the combined quantized value determines the order of the first codebook W1, Rank (W1), and the order of the second codebook W2, and according to the order of the first codebook W1 and the second codebook
  • the order of W2 determines the precoding matrix W.
  • the channel state indication information may be in addition to the quantized value including the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2.
  • the method includes: a total order of the precoding matrix W.
  • the first code determined by the transmitting device to further verify a combined quantized value according to the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2
  • the channel state indication information may include: an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the sending module 12 can be specifically configured to: And transmitting the channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: a total order of the precoding matrix W;
  • the sending module 12 can be specifically configured to:
  • the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.
  • the first codebook W1 and the second codebook W2 may be selected from a 2-antenna codebook, a 4-antenna codebook, or an 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.
  • LTE Long Term Evolution
  • FIG. 7 is a schematic structural diagram of Embodiment 1 of a transmitting device according to the present invention.
  • the transmitting device in this embodiment may be a base station or a terminal.
  • the transmitting device 700 of this embodiment may include: a sending module 21, a receiving module 22, and a processing module 23, where
  • the sending module 21 can be configured to send a reference signal to the receiving device.
  • the receiving module 22 may be configured to receive the channel state indication information sent by the receiving device, where the processing module 23 may be configured to determine, according to the channel state indication information, a precoding matrix selected by the receiving device from the codebook based on the reference signal. W, wherein the precoding matrix W is a product or a direct product of two matrices W1 and W2,
  • the order Rank (W1) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.
  • the sending device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 4, and the implementation principle is similar, and details are not described herein again.
  • the transmitting device of this embodiment determines, according to the received channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, because the precoding matrix W selected by the transmitting device is representative of the horizontal direction.
  • the first codebook W1 and the codebook representing the vertical direction are second The product or direct product of the codebook W2, so that the characteristics of the three-dimensional beam vector can be expressed in the codebook, so the precoding matrix W can be used as a 3D codebook; and by defining the order Rank of the first codebook W1 ( W1) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and therefore, the 3D codebook The accuracy is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of precoding, thereby reducing
  • the channel state indication information includes: an indicator i a indicated by a precoding matrix of the first codebook W1 and an indicator i e indicated by a precoding matrix of the second codebook W2 ;
  • the processing module 23 can be specifically used to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, and a channel quality An information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W;
  • the processing module 23 can be specifically configured to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, a CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;
  • the processing module 23 can be specifically configured to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes: a combined quantized value of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2)
  • the processing module 23 can be specifically configured to:
  • the precoding matrix w selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may be in addition to the quantized value including the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2.
  • the method includes: a total order of the precoding matrix W.
  • the first code determined by the transmitting device to further verify a combined quantized value according to the combination of the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2
  • the channel state indication information may include: an order Rank (Wl) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the processing module 23 can be specifically configured to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: a total order of the precoding matrix W;
  • the processing module 23 can be specifically configured to:
  • the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type;
  • the device Determining the receiving according to the order of the first codebook W1 and the order of the second codebook W2
  • the device is based on the precoding matrix w selected from the codebook based on the reference signal.
  • the first codebook W1 and the second codebook W2 are respectively selected from a 2-antenna codebook, a 4-antenna codebook or an 8-antenna codebook of the Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • FIG. 8 is a schematic structural diagram of a hardware structure of a receiving device according to Embodiment 3 of the present invention.
  • the receiving device in this embodiment may be a base station or a terminal.
  • the receiving device 800 of this embodiment may include: a receiver 801 and a transmitter 802.
  • the receiving device may further include a processor 803 and a memory 804.
  • the receiver 801, the transmitter 802, the processor 803, and the memory 804 may be connected through a system bus or the like.
  • the system bus is connected as an example; the system bus may be an ISA bus, a PCI bus, or an EISA bus.
  • the system bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one line is shown in Figure 8, but it does not mean that there is only one bus or one type of bus.
  • the receiver 801 may be configured to select a precoding matrix W from the codebook based on a reference signal sent by the sending device, where the precoding matrix W is a product of the first codebook W1 and the second codebook W2 or Direct product,
  • the order of the first codebook W1, Rank (W1), is greater than or equal to the second codebook.
  • the transmitter 802 is configured to send channel state indication information to the sending device, so that the sending device determines the precoding matrix W according to the channel state indication information.
  • the receiving device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3, and the implementation principle thereof is similar, and details are not described herein again.
  • the receiving device of this embodiment selects the precoding matrix W from the codebook based on the reference signal transmitted by the transmitting device, by using the first codebook W1 representing the horizontal direction and the second codebook W2 representing the vertical codebook. Constructed to be able to represent the characteristics of the three-dimensional beam vector in the codebook, so the constructed precoding matrix W can be used as a 3-dimensional (3D) codebook; and by defining the order Rank of the first codebook W1 (W1) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the constructed 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and thus, the constructed The accuracy of the 3D codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of the precoding, thereby reducing performance loss. High system throughput.
  • the receiving device of this embodiment may also have the following six specific implementation manners.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix of the first codebook W1 and an indicator i e indicated by a precoding matrix of the second codebook W2 ;
  • the transmitter 802 can be specifically configured to:
  • the sending device determines the first code according to a preset rule or a mapping relationship between an indicator indicated by a preset precoding matrix and a codebook order
  • the order of the W1 and the order of the second codebook W2 are determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, and a channel a quality information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W;
  • the transmitter 802 can be specifically configured to:
  • the sending device determines the second according to the order Rank of the first codebook W1, Rank (W1), and the total order of the precoding matrix W.
  • the order of the codebook W2 is Rank (W2), and the precoding matrix W is determined according to the order of the first codebook W1 and the order of the second codebook W2;
  • the processor 803 may be configured to: after the receiving device sends the channel state indication information to the sending device, the indicator i a indicated by the precoding matrix corresponding to the first codebook and the first code
  • the order Rank (W1) of the W1 is jointly encoded, and the indicator i e indicated by the precoding matrix of the second codebook W2 is jointly encoded with the CQI.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, a CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;
  • the transmitter 802 can be specifically configured to:
  • the sending device determines the first according to the order Rank (W2) of the second codebook W2 and the total order of the precoding matrix W
  • the order of the two codebooks W2 determines the precoding matrix W.
  • the processor 803 may be configured to: after the receiving device sends the channel state indication information to the sending device, the indicator i e indicated by the precoding matrix corresponding to the second codebook and the first The order Rank (W2) of the two codebooks W2 is jointly coded, and the indicator i a indicated by the precoding matrix of the first codebook W1 is jointly encoded with the CQI.
  • the channel state indication information may include: a combination of the combination of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2) Value
  • the transmitter 802 can be specifically configured to:
  • the combined quantized value determines an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2, and according to the order of the first codebook W1 and the The order of the second codebook W2 determines the precoding matrix W.
  • the channel state indication information includes an order of the first codebook W1
  • the total order of the precoding matrix W may also be included.
  • the first code determined by the transmitting device to further verify a combined quantized value according to a combination of the order Rank(W1) of the first codebook W1 and the order Rank(W2) of the second codebook W2 The correctness of the order Rank of the W1 (W1) and the order of the second codebook W2, Rank (W2).
  • the channel state indication information may include: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the transmitter 802 can be specifically configured to:
  • the channel state indication information may include: a total order of the precoding matrix W;
  • the transmitter 802 can be specifically configured to:
  • the sending device determines the first codebook according to a total order of the precoding matrix W and antenna configuration information of the receiving device.
  • the precoding matrix W, wherein the antenna configuration information of the transmitting device includes: a first antenna port number, a second antenna port number, and an antenna polarization type.
  • the first codebook W1 and the second codebook W2 may be selected from a 2-antenna codebook, a 4-antenna codebook, or an 8-antenna codebook of the Long Term Evolution (LTE) system, respectively.
  • LTE Long Term Evolution
  • FIG. 9 is a schematic diagram of the hardware structure of the second embodiment of the sending device of the present invention.
  • the sending device in this embodiment may be a base station or a terminal.
  • the transmitting device 900 of this embodiment may include: a transmitter 901, a receiver 902, and a processor 903.
  • the receiving device may further include a memory 904.
  • the transmitter 901, the receiver 902, the processor 903, and the memory 903 can be connected through a system bus or the like.
  • the system bus is connected as an example; the system bus can be an ISA bus, a PCI bus, or an EISA bus.
  • the system bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one line is shown in Figure 9, but it does not mean that there is only one bus or one type of bus. among them,
  • the transmitter 901 is configured to send a reference signal to the receiving device.
  • the receiver 902 may be configured to receive the channel state indication information that is sent by the receiving device, where the processor 903 may be configured to determine, according to the channel state indication information, a precoding matrix selected by the receiving device from the codebook based on the reference signal. W, wherein the precoding matrix W is a direct product or a product of two matrices W1 and W2,
  • the order Rank (Wl) of the first codebook W1 is greater than or equal to the order Rank (W2) of the second codebook W2.
  • the sending device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 4, and the implementation principle is similar, and details are not described herein again.
  • the transmitting device of this embodiment determines, according to the received channel state indication information, the precoding matrix W selected by the receiving device from the codebook based on the reference signal, because the precoding matrix W selected by the transmitting device is representative of the horizontal direction. a direct product or a product of the first codebook W1 and the second codebook W2 representing the vertical codebook, so that the characteristics of the three-dimensional beam vector can be expressed in the codebook, and thus the precoding matrix W can be used as a 3D codebook;
  • the order Rank (Wl) is greater than or equal to the order Rank (W2) of the second codebook W2, such that the 3D codebook W conforms to the characteristic that the 3D channel is smaller than the horizontal expansion angle at the vertical expansion angle, and therefore, The accuracy of the 3D codebook is high. Therefore, the transmitting device performs precoding based on the precoding matrix selected from the codebook structure of the present invention fed back by the receiving device, which can effectively improve the accuracy of the precoding, thereby reducing
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix of the first codebook W1 and an indicator i e indicated by a precoding matrix of the second codebook W2 ;
  • the processor 903 can be specifically used to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, and a channel a quality information indicator CQI, an order Rank of the first codebook W1, Rank (W1), and a total order of the precoding matrix W;
  • the processor 903 can be specifically configured to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: an indicator i a indicated by a precoding matrix corresponding to the first codebook, an indicator i e indicated by a precoding matrix of the second codebook W2, a CQI, an order Rank of the second codebook W2 (W2), and a total order of the precoding matrix W;
  • the processor 903 can be specifically configured to:
  • the device Determining the receiving according to the order of the first codebook W1 and the order of the second codebook W2
  • the device is based on the precoding matrix w selected from the codebook based on the reference signal.
  • the channel state indication information includes: a combined quantized value of the order Rank of the first codebook W1 (W1) and the order of the second codebook W2 (W2)
  • the processor 903 can be specifically configured to:
  • the combined quantized value of Rank (W2) determines the order Rank (W1) of the first codebook W1 and the order Rank (W2) of the second codebook W2;
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information includes an order of the first codebook W1
  • the total order of the precoding matrix W may also be included.
  • the first code determined by the transmitting device to further verify a combined quantized value according to a combination of the order Rank(W1) of the first codebook W1 and the order Rank(W2) of the second codebook W2 The correctness of the order Rank of the W1 (W1) and the order of the second codebook W2, Rank (W2).
  • the channel state indication information may include: an order Rank (W1) of the first codebook W1 and an order Rank (W2) of the second codebook W2;
  • the processor 903 can be specifically configured to:
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the channel state indication information may include: a total order of the precoding matrix W;
  • the processor 903 can be specifically configured to:
  • the antenna configuration information of the sending device includes: a first antenna port number, a second antenna port number, and an antenna polarization type;
  • Determining the precoding matrix W selected by the receiving device from the codebook based on the reference signal is determined according to the order of the first codebook W1 and the order of the second codebook W2.
  • the first codebook W1 and the second codebook W2 The two antenna codebooks, the four antenna codebooks, or the eight antenna codebooks of the Long Term Evolution (LTE) system are respectively selected.
  • 10 is a schematic structural diagram of an embodiment of a communication system according to the present invention.
  • the system 1000 of the present embodiment includes: a receiving device and a transmitting device, where the receiving device can adopt the structure of the device embodiment shown in FIG.
  • the technical solution of the method embodiment shown in FIG. 3 can be performed, and the sending device can adopt the structure of the device embodiment shown in FIG. 9 , and correspondingly, the technical solution of the method embodiment shown in FIG. 4 can be executed, and the implementation principle thereof is implemented. Similar to the technical effect, it will not be described here.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Abstract

Des modes de réalisation de la présente invention concernent un procédé pour déterminer une indication de matrice de précodage, un dispositif récepteur et un dispositif émetteur. Le procédé pour déterminer une indication de matrice de précodage comprend les étapes suivantes : un dispositif récepteur sélectionne une matrice de précodage W dans un livre de codes selon un signal de référence envoyé par un dispositif émetteur, la matrice de précodage W étant un produit ou un produit direct d'un premier livre de codes W1 et d'un deuxième livre de codes W2, et un classement (W1) du premier livre de codes W1 étant supérieur ou égal à un classement (W2) du deuxième livre de codes W2; et le dispositif récepteur envoie des informations d'indication d'état de canal au dispositif émetteur, de telle façon que le dispositif émetteur détermine la matrice de précodage W d'après les informations d'indication d'état de canal. Le procédé pour déterminer une indication de matrice de précodage, le dispositif récepteur et le dispositif émetteur des modes de réalisation de la présente invention permettent d'améliorer la précision du précodage, ce qui améliore le débit d'un système.
PCT/CN2013/086414 2013-11-01 2013-11-01 Procédé pour déterminer une indication de matrice de précodage, dispositif récepteur et dispositif émetteur WO2015062069A1 (fr)

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