WO2009088248A2 - Système de communication multi-entrée et multi-sortie pour correction aval d'indicateur de vecteur d'interférence - Google Patents

Système de communication multi-entrée et multi-sortie pour correction aval d'indicateur de vecteur d'interférence Download PDF

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Publication number
WO2009088248A2
WO2009088248A2 PCT/KR2009/000121 KR2009000121W WO2009088248A2 WO 2009088248 A2 WO2009088248 A2 WO 2009088248A2 KR 2009000121 W KR2009000121 W KR 2009000121W WO 2009088248 A2 WO2009088248 A2 WO 2009088248A2
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Prior art keywords
vectors
precoding
mapping table
vector
interference
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PCT/KR2009/000121
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English (en)
Korean (ko)
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WO2009088248A3 (fr
Inventor
Yongxing Zhou
Joon-Il Choi
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Samsung Electronics Co., Ltd.
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Priority claimed from CNA2008100004505A external-priority patent/CN101483460A/zh
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to US12/812,550 priority Critical patent/US8553787B2/en
Publication of WO2009088248A2 publication Critical patent/WO2009088248A2/fr
Publication of WO2009088248A3 publication Critical patent/WO2009088248A3/fr

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    • 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
    • H04B7/0417—Feedback systems
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • MIMO multiple input multiple output
  • the base station in order for the base station to efficiently transmit the plurality of data streams using the plurality of antennas, it is necessary to identify channel information about downlink channels formed between the plurality of antennas and the users of the base station.
  • users feed back channel information for downlink channels to the base station, and the base station constructs a precoding matrix for the users based on the channel information.
  • the base station beamforms the data streams using a plurality of precoding vectors included in the precoding matrix.
  • the configuring of the mapping table may be a step of configuring the mapping table by classifying the plurality of vectors based on a probability that the plurality of vectors are included in the precoding matrix, wherein the probability is the plurality of vectors. Can be predicted based on the similarity between the field and the target precoding vector or the interference of the plurality of vectors with respect to the target precoding vector.
  • the configuring of the mapping table may include configuring the mapping table such that orthogonal vectors of the plurality of vectors are orthogonal to the target precoding vector, or are larger than a threshold value among the plurality of vectors.
  • the mapping table may be configured to separately classify vectors having a high probability of being included in the precoding matrix and vectors having a lower probability of being included in the precoding matrix among the plurality of vectors.
  • the communication method of the terminal for the target user is based on the precoding vector indicator received from the base station among the precoding vectors included in the precoding matrix for the target user for the target user Recognizing, at least one bit for an interference vector indicator representing at least one remaining precoding vector in consideration of the probability that the plurality of vectors included in the codebook are included in the precoding matrix, and a mapping between the plurality of vectors Constructing a table and analyzing the interference vector indicator received from the base station based on the mapping table to recognize the at least one remaining precoding vector.
  • the base station when the precoding vectors included in the precoding matrix are classified into a target precoding vector and at least one remaining precoding vector for the target user, a plurality of vectors included in the codebook
  • a mapping table configuration module for configuring a mapping table between the plurality of vectors and at least one bit for an interference vector indicator indicating the at least one remaining precoding vector in view of the probability that they are included in the precoding matrix
  • the An indicator generation module for generating a precoding vector indicator indicating a target precoding vector, and generating the interference vector indicator using the mapping table, and providing an indicator for providing the precoding vector indicator and the interference vector indicator to the target user.
  • a base station and a terminal construct a mapping table by estimating the probability that a plurality of vectors included in a codebook are included in a precoding matrix, thereby reducing the number of bits for the interference vector indicator and using the interference vector well. I can express it.
  • the base station and the terminal can transmit / receive an interference vector indicator having an optimized form by adaptively determining the mode configuring the mapping table.
  • FIG. 1 is a diagram illustrating an example of a multi-user multi-input / output communication system.
  • FIG. 3 is a flowchart illustrating a process of determining a mode constituting a mapping table according to an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a process of determining a mode of configuring a mapping table according to another embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating an operation method of a base station and a terminal in a multiple input / output communication system according to an embodiment of the present invention.
  • FIG. 1 is a diagram illustrating an example of a multi-user multi-input / output communication system.
  • channels are formed between the base station 110 and each of the plurality of terminals 120, 130, and 140, and the base station 110 and each of the plurality of terminals 120, 130, and 140 transmit / receive signals through the formed channel.
  • the base station 110 may transmit pilot signals to the plurality of terminals 120, 130, and 140 through a downlink channel.
  • the pilot signal is a signal well-known to the base station 110 and the plurality of terminals 120, 130, and 140.
  • each of the plurality of terminals 120, 130, and 140 may estimate downlink channels formed between the base station 110 and the plurality of terminals 120, 130, and 140 using a pilot signal.
  • each of the plurality of terminals 120, 130, and 140 provides feedback information on the estimated downlink channels to the base station 110.
  • the base station 110 determines a precoding matrix for precoding or beamforming a plurality of data streams for the plurality of terminals 120, 130, and 140 based on the feedback information.
  • the base station 110 may determine a precoding matrix by selecting some of the plurality of vectors included in the codebook as precoding vectors based on the feedback information.
  • each of the plurality of terminals 120, 130, and 140 should be able to grasp the corresponding precoding vector and the remaining precoding vectors.
  • the precoding matrix includes precoding vectors v 1, v 2, v 3 .
  • each of v 1, v 2, and v 3 is a precoding vector for each of the plurality of terminals 120, 130, and 140.
  • UE 1 120 should be able to determine that the precoding vector for itself is v 1 , and that v 2 and v 3 are interference vectors for the precoding vector v 1 for itself as the remaining precoding vectors.
  • UE 2 130 should be able to determine that the precoding vector for itself is v 2 , and that v 1 and v 3 are interference vectors for precoding vector v 2 for itself as the remaining precoding vectors.
  • K 140 must be able to determine that the precoding vector for itself is v 3 and that v 1 and v 2 are the interference vectors for the precoding vector v 3 for itself as the remaining precoding vectors.
  • the base station 110 transmits feedforward information including a precoding vector and indicators capable of identifying the remaining precoding vectors to the plurality of terminals 120, 130, and 140.
  • feedforward information including a precoding vector and indicators capable of identifying the remaining precoding vectors to the plurality of terminals 120, 130, and 140.
  • each of the plurality of terminals 120, 130, and 140 may grasp the corresponding precoding vector and the remaining precoding vectors using the feedforward information.
  • the base station 110 beamforms the data streams with the precoding vectors included in the precoding matrix to generate a transmission signal.
  • the base station 110 since each of the plurality of terminals 120, 130, and 140 knows the corresponding precoding vector and the remaining precoding vectors in advance, the interference existing in the received signal may be removed.
  • FIG. 2 is a diagram for explaining a precoding vector indicator and an interference vector indicator.
  • k, i, j, and m are indices of users
  • u k , u i , u j , and u m are precoding vectors for users k, i, j and m, respectively.
  • u i , u j , u m are interference vectors as the remaining precoding vectors for precoding vector u k for user k.
  • Log 2 (Nq) bits are required to represent any one of the Nq vectors.
  • the base station uses P SDMA X log 2 (Nq) to express the precoding vector u k and the remaining precoding vectors u i , u j , u m for user k. You can see that bits are required.
  • PMI signaling The transmission of the indicators for the precoding vector and the remaining precoding vectors to a plurality of users will be referred to as precoding matrix indicator (PMI) signaling.
  • PMI signaling is performed on a physical downlink control channel (PDCCH) and may cause a lot of overhead in a communication system. Since this overhead reduces the performance of the communication system, there is a need for a technique for efficient PMI signaling with little overhead.
  • PDCCH physical downlink control channel
  • FIG. 3 is a flowchart illustrating a process of determining a mode constituting a mapping table according to an embodiment of the present invention.
  • each of v 1 , v 2 , and v Nq is a column vector of size MX 1, and the rank r is the number of users (P SDMA ) served simultaneously. It is also assumed that there is a constraint that the size of PMI signaling for rank r must be smaller than B r .
  • a mode constituting a mapping table for classifying a plurality of vectors included in a codebook into orthogonal and non-orthogonal vectors for a target precoding vector u k (minimum signaling mode)
  • a base station may configure a mapping table as shown in Table 1 above.
  • the user k may also configure the same mapping table through the same method as the base station.
  • the base station may separate Nq vectors included in the codebook into orthogonal vectors and non-orthogonal vectors for the target precoding vector u k in order to generate an interference vector indicator indicating the remaining precoding vectors other than the target precoding vector. Can be.
  • the base station individually represents each orthogonal vector for the target precoding vector u k , and may represent non-orthogonal vectors in one case (half bit).
  • the interference vector indicator may be represented by 2 bits. That is, the base station maps v 2 to '00', v 3 to '01' and v 4 to '10'. The base station also maps all of the remaining vectors to '11'.
  • the base station When the base station is at least one of v 2 , v 3 , and v 4 except for the target precoding vector v 1 from the precoding vectors included in the precoding matrix, '00', At least one of '01' and '10' is determined as the interference vector indicator. However, when none of the remaining precoding vectors is any one of v 2 , v 3 , and v 4 , the base station determines '11' as the interference vector indicator. As a result, it can be seen that the base station can generate the interference vector indicator using 2 bits.
  • the probabilities that the plurality of vectors included in the codebook are included in the precoding matrix may vary. However, in a general case, it can be predicted that orthogonal vectors for the target precoding vector have a relatively high probability of being included in the precoding matrix, and that the non-orthogonal vectors have a relatively low probability of being included in the precoding matrix. Using this fact, the base station according to the embodiment of the present invention can identify the orthogonal vectors individually, and can configure a mapping table that treats the non-orthogonal vectors as one case.
  • the base station may configure a mapping table to individually identify some of the non-orthogonal vectors.
  • the base station compares t 0 and B r (S320).
  • the base station determines the mapping table configured according to the minimum signaling mode, and terminates the process of determining the mode configuring the mapping table. Then, the interference vector indicator is generated according to the determined mapping table and provided to the user.
  • the base station changes the mapping table so that one non-orthogonal vector can be identified separately, and the size of PMI signaling corresponding to the changed mapping table. Calculate t 1 (S330).
  • the changed mapping table may inform the user of the remaining precoding vectors more accurately than the mapping table according to the minimum signaling mode, but may have a larger size t 1 of PMI signaling.
  • the calculation process of t 1 is described in detail below.
  • one additional non-orthogonal vector may be determined based on the similarity between the plurality of vectors and the target precoding vector or the interference of the plurality of vectors with respect to the target precoding vector.
  • the similarity between the plurality of vectors and the target precoding vector or the interference of the plurality of vectors with respect to the target precoding vector is a concept corresponding to the probability that the plurality of vectors are included in the precoding matrix.
  • Signal to Interference Ratio (SIR) i and j of the i th beam vector with respect to the j th beam vector may be expressed by Equation 1 below.
  • U i is the i th beam vector
  • d is the spacing between the transmit antennas
  • n is the index of the transmit antenna.
  • the base station compares the calculated size t 1 of the PMI signaling with a predetermined limit B r (S340).
  • step S310 is repeated.
  • the base station changes the mapping table so as to separately identify another non-orthogonal vector separately.
  • the base station changes the mapping table so as to separately identify the r-1 th non-orthogonal vector and calculates t r-1 ( S360).
  • the base station checks whether the calculated t r-1 and B r are the same (S370). If t r-1 and B r are equal, the mapping table generated in step S360 is finally determined, and if t r-1 and B r are not equal, the previous step is repeated.
  • the previous step is to change the mapping table so as to separately identify the r-2 th non-orthogonal vector, and calculate t r-2 .
  • the q non-orthogonal vectors for the target precoding vector u k added to be individually identified in the mapping table may be selected through the following process. Where q is 1, 2,. . , r-1.
  • Orthogonal Basis Setup Find all possible sets.
  • each of the sets is composed of rq vectors, and the rq vectors (target precoding vector u k and
  • P q-1 represents all possible cases in the mapping table generated in the previous step, and P added, q represents cases added to the mapping table in the current step. Also, +1 represents all vectors not selected.
  • mapping table may be represented as shown in Table 2 below.
  • the base station and the user of the present invention may transmit / receive an interference vector indicator indicating the remaining precoding vectors included in the precoding matrix by using the mapping tables shown in Tables 1 and 2 described above.
  • the base station and the user may determine a mode configuring the mapping table appropriately in consideration of the number of bits for the interference vector indicator, and generate and use a mapping table corresponding to the determined mode.
  • FIG. 4 is a flowchart illustrating a process of determining a mode of configuring a mapping table according to another embodiment of the present invention.
  • the base station according to another embodiment of the present invention may not distinguish between orthogonal and non-orthogonal vectors for the target precoding vector in order to select vectors added to the mapping table. That is, adding orthogonal vectors for the target precoding vector to the mapping table preferentially means that the orthogonal vectors are determined to be determined as precoding vectors together with the target precoding vector.
  • the base station according to another embodiment of the present invention does not discriminate orthogonal vectors and non-orthogonal vectors, and adds to the mapping table by predicting a probability that the plurality of vectors are included with the target precoding vector in the precoding matrix. You can choose which vectors to use. In particular, the probability that the plurality of vectors are included with the target precoding vector in the precoding matrix can be predicted based on the similarity or SIR between the target precoding vector and the plurality of vectors.
  • the interference vectors for the target precoding vector u k added to the mapping table may be selected as vectors corresponding to an SIR larger than a predetermined threshold. And, the number of interference vectors can be adjusted by appropriately changing the threshold.
  • Equation 3 the matrix TT may be represented by Equation 3 below.
  • the elements of the i th row and the j th column of the matrix TT are to be.
  • an embodiment of the present invention may select interference vectors that can be individually identified in a mapping table among a plurality of vectors included in a codebook using optimization criteria described in Equation 4 below.
  • u k v 1
  • ⁇ v 3 ⁇ is chosen as the interference vector that can be individually identified in the mapping table.
  • u k v for 6 ⁇ v 8 ⁇
  • u k v v for 7 ⁇ 5 ⁇
  • an embodiment of the present invention may adjust the threshold q .
  • Example of a mode constituting a mapping table for classifying a plurality of vectors included in a codebook into orthogonal and non-orthogonal vectors for a target precoding vector u k
  • mapping table corresponding to the minimum signaling mode may be shown in Table 3 below.
  • ⁇ v 1 ⁇ ⁇ v 2 ⁇ ⁇ v 3 ⁇ ⁇ v 4 ⁇ are united in the DFT codebook.
  • the interference vector indicator includes two bits.
  • the interference vector indicator maps them to '00', '01', and '10' to individually identify the interference vectors 1, 2, and 3 of the plurality of vectors.
  • the remaining vectors except for interference vectors 1, 2, and 3 are all mapped to '11'.
  • interference vectors 1, 2, and 3 orthogonal to v 1 are ⁇ v 2 ⁇ ⁇ v 3 ⁇ ⁇ v 4 ⁇
  • the non-orthogonal vectors for v 1 are ⁇ v 5 ⁇ ⁇ v 6 ⁇ ⁇ v 7 ⁇ ⁇ v 8 ⁇ .
  • the base station determines one of '00', '01', and '10' as the interference vector indicator.
  • the base station determines '11' as the interference vector indicator.
  • the embodiment of the present invention may be applied to a codebook for the case where the number of transmit antennas of 3GPP LTE2 shown in Table 4 is two.
  • the mapping table may be configured as shown in Equation 5 below.
  • 'Unitary Pairing' denotes a vector v 2 orthogonal to v 1
  • 'Non-Unitary Pairing' denotes ⁇ v 3 ⁇ ⁇ v 4 ⁇ ⁇ v 5 ⁇ ⁇ v 6 ⁇ .
  • mapping table may be represented as shown in Table 6 below.
  • the base station calculates t 0 according to the minimum signaling mode (S410).
  • the base station compares t 0 and B r (S420). If t 0 is greater than or equal to B r , the base station finally determines the mapping table according to the minimum signaling mode, and terminates all processes. However, if t 0 is smaller than B r , the base station adjusts the threshold of Equation 4 so that three vectors are added as interference vectors of the mapping table, and calculates t 1 (S430).
  • the base station compares t 1 and B r (S440). If t 1 is not less than B r , the base station checks whether t 1 and B r are the same (S450). If t 1 and B r are the same, the mapping table generated in step S430 is finally determined, and all processes are terminated. On the contrary, if t 1 and B r are not the same, step S410 is performed again.
  • the base station according to an embodiment of the present invention is a process of adjusting the threshold value so that three vectors are added sequentially and the process of comparing the size of the PMI signaling corresponding to the changed mapping table with B r by adjusting the threshold value. Repeat. These, processes are shown in steps S460 and S470.
  • step S470 if t h-1 (where h is an integer greater than 0) is equal to B r , a mapping table including 2 h-1 interference vectors is finally determined. In contrast, if t h-1 is not equal to B r , the process of generating a mapping table including 2 h-2 interference vectors is performed again, and all processes are terminated.
  • the base station generates a precoding vector indicator indicating a target precoding vector for a target user among precoding vectors included in the precoding matrix (S510).
  • the base station includes at least one bit for an interference vector indicator indicating at least one remaining precoding vector in consideration of a probability that a plurality of vectors included in a codebook are included in the precoding matrix;
  • a mapping table between the plurality of vectors is configured (S520).
  • the base station may configure the mapping table by classifying the plurality of vectors based on the probability that the plurality of vectors are included in the precoding matrix. For example, only a predetermined number of vectors may be determined as interference vectors of the mapping table according to a high probability that the plurality of vectors are included in the precoding matrix. In this case, vectors not selected as interference vectors are considered one case.
  • the base station determines the plurality of vectors in the precoding matrix based on the similarity between the plurality of vectors and the target precoding vector or the interference of the plurality of vectors with respect to the target precoding vector.
  • the probability to be included can be predicted.
  • the base station may determine only the vectors having a probability included in the precoding matrix higher than the predetermined threshold value as the interference vectors of the mapping table. At this time, vectors having a probability included in the precoding matrix lower than the predetermined threshold value are regarded as one case.
  • the base station may configure a mapping table that distinguishes the plurality of vectors into orthogonal and non-orthogonal vectors for the target precoding vector, and considers only orthogonal vectors as interference vectors.
  • the base station generates an interference vector indicator indicating the remaining precoding vector other than the target precoding vector among the precoding vectors included in the precoding matrix by using any one of various mapping tables. (S530).
  • mapping table used by the base station is also used by the terminal.
  • the base station according to an embodiment of the present invention provides the generated precoding vector indicator and the interference vector indicator to the terminal (S540).
  • the terminal for the target user recognizes the target precoding vector for the target user of the precoding vectors included in the precoding matrix based on the precoding vector indicator received from the base station ( S550).
  • the terminal for the target user configures the mapping table in the same manner as the base station (S560).
  • the terminal for the target user recognizes the remaining precoding vectors included in the precoding matrix by analyzing the interference vector indicator using the configured mapping table (S570).
  • the terminal for the target user removes the interference from the received data signal using the recognized precoding vector and the remaining precoding vectors (S580).
  • the methods according to the invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.
  • FIG. 6 is a block diagram illustrating a base station and a terminal in a multi-user multi-input / output communication system according to an embodiment of the present invention.
  • the multi-user multi-input / output communication system includes a base station 610 and K terminals 620, 630, and 640.
  • the base station 610 includes a mapping table configuration module 611, an indicator generation module 612, and an indicator providing module 613.
  • the mapping table construction module 611 may include at least one bit for the interference vector indicator indicating at least one remaining precoding vector in consideration of the probability that the plurality of vectors included in the codebook are included in a precoding matrix, and the plurality of vectors. Configure the mapping table between them. Since the mapping table configuration module 611 may apply the principle of configuring the mapping table described with reference to FIGS. 1 to 5 as it is, detailed description thereof will be omitted.
  • the indicator generation module 612 generates a precoding vector indicator indicating the target precoding vector, and generates the interference vector indicator using the mapping table.
  • the indicator providing module 613 provides the precoding vector indicator and the interference vector indicator to the target user.
  • the terminal K 640 includes a mapping table configuration module 641, an indicator receiving module 642, and a vector recognition module 643.
  • the mapping table configuration module 641 of the terminal K 640 also configures the mapping table using the same principle as the mapping table configuration module 642 of the base station 610.
  • the indicator receiving module 642 receives the precoding vector indicator and the interference vector indicator from the base station 610, and the vector recognition module 643 uses the configured mapping table, the precoding vector indicator, and the interference vector indicator to target-free. Recognize a coding vector and at least one remaining precoding vector.

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Abstract

L'invention concerne une station de base qui fournit un indicateur de vecteur d'interférence à un terminal et un terminal qui reconnaît au moins un vecteur de précodage de repos par le biais d'un indicateur de vecteur d'interférence. La station de base et le terminal configurent une table de mappage pour un indicateur de vecteur d'interférence, qui indique au moins un vecteur de précodage de repos, entre au moins un bit et plusieurs vecteurs basés sur la probabilité selon laquelle lesdits vecteurs compris dans une liste de codage sont contenus dans une matrice de précodage. Dès lors, la station de base crée un indicateur de vecteur d'interférence et le terminal reconnaît au moins un vecteur de précodage de repos en utilisant la table de mappage. De plus, la table de mappage est configurée différemment selon plusieurs modes.
PCT/KR2009/000121 2008-01-11 2009-01-09 Système de communication multi-entrée et multi-sortie pour correction aval d'indicateur de vecteur d'interférence WO2009088248A2 (fr)

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Application Number Priority Date Filing Date Title
US12/812,550 US8553787B2 (en) 2008-01-11 2009-01-09 Multiple input multiple output (MIMO) communication system for feedforwarding interference vector indicator

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CN200810000450.5 2008-01-11
CNA2008100004505A CN101483460A (zh) 2008-01-11 2008-01-11 构建用于mu-mimo系统的可分级pmi信令方法
KR1020090001393A KR101567306B1 (ko) 2008-01-11 2009-01-08 간섭 벡터 지시자를 피드포워드하는 다중 입출력 통신 시스템
KR10-2009-0001393 2009-01-08

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KR20050020576A (ko) * 2003-08-18 2005-03-04 삼성전자주식회사 다중 사용자 다중 입력 다중 출력 방식을 사용하는 무선통신 시스템에서 자원 스케쥴링 장치 및 방법
KR20070042099A (ko) * 2005-10-17 2007-04-20 삼성전자주식회사 다중 사용자 다중 안테나 통신시스템의 송ㆍ수신기 및송ㆍ수신방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012043959A1 (fr) * 2010-09-27 2012-04-05 Samsung Electronics Co., Ltd. Procédé et appareil d'alignement de brouillage à l'aide d'un index d'action directe dans un système de communication cellulaire hiérarchique
US9331764B2 (en) 2010-09-27 2016-05-03 Samsung Electronics Co., Ltd. Method and apparatus for aligning interference using a feed forward index in a hierarchical cell communication system

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