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WO2018033207A1 - Mécanisme de partage de csi adaptatif pour précodage activé pour le d2d dans un système mimo massif - Google Patents

Mécanisme de partage de csi adaptatif pour précodage activé pour le d2d dans un système mimo massif Download PDF

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Publication number
WO2018033207A1
WO2018033207A1 PCT/EP2016/069606 EP2016069606W WO2018033207A1 WO 2018033207 A1 WO2018033207 A1 WO 2018033207A1 EP 2016069606 W EP2016069606 W EP 2016069606W WO 2018033207 A1 WO2018033207 A1 WO 2018033207A1
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WO
WIPO (PCT)
Prior art keywords
csi
transmitting device
channel
signal subspace
communication
Prior art date
Application number
PCT/EP2016/069606
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English (en)
Inventor
Gaoning HE
Junting CHEN
Laura COTTATELLUCCI
Haifan YIN
David Gesbert
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Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN201680087537.3A priority Critical patent/CN109463042B/zh
Priority to PCT/EP2016/069606 priority patent/WO2018033207A1/fr
Publication of WO2018033207A1 publication Critical patent/WO2018033207A1/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
    • H04B7/06—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
    • H04B7/0617—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 for beam forming
    • 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
    • H04B7/0452—Multi-user MIMO 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
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

Definitions

  • the invention relates to the field of wireless communications, and more particularly to a multi-input multi-output (M IMO) system in a device-to-device (D2D) communication.
  • M IMO multi-input multi-output
  • D2D device-to-device
  • the transceivers can obtain through leveraging a large number of antennas a high power gain on the received signal as well as a large spatial multiplexing gain for parallel transmissions to a large number of users.
  • MIMO massive multi-input multi-output
  • the achievement of such a gain requires a lot of additional efforts on the design of the MIMO precoding.
  • One of the most difficult challenges is the acquisition of channel state information (CSI), in particular in frequency-division multiplexing (FDD) systems, which still dominate the market although a dense literature focusing on precoding strategies in time-division duplexing (TDD) systems develops increasingly.
  • CSI channel state information
  • FDD frequency-division multiplexing
  • TDD time-division duplexing
  • the base station first sends a sequence of pilot symbols for each antenna, the users then estimate the channel and feedback the channel estimation to the BS for each antenna.
  • D2D device-to-device
  • a massive MIMO BS serves a group of users, wherein one user is selected as a leader who collects the full CSI from all the other users via the D2D communication links.
  • the leader Upon obtaining the global CSI, the leader computes the precoder and feeds the set of chosen precoder indices back to the BS.
  • Simulation results show that such a technique can significantly reduce the feedback loading from the users to the BS, while still achieving a good sum rate performance.
  • two main issues persist. First, the method requires a central coordination among the users, which may not be a robust design in the multi-user networks.
  • the technique assumes that a perfect global CSI is known by the leader user, which requires very high data rates for the signaling among users.
  • the resulting capacity required for the D2D CSI exchange may be far too large for the D2D network such that the D2D enabled massive MIMO precoding is hard to be implemented in existing systems without a smart design on the CSI exchange among the users.
  • the method and apparatus of the invention allows adaptively sharing or exchanging a channel state information and setting a distributed precoding amongst a plurality of users in a multi- input multi-output system over a device-to-device communication.
  • the invention relates to a method for adaptively sharing channel state information (CSI) in a multi-input multi-output system over a device-to-device (D2D) communication
  • the method performed at a first transmitting device comprises the step of determining, a first transmitting device, a respective signal subspace; determining, at the first transmitting device whether the signal subspace of the first transmitting device overlaps the signal subspace of at least one second transmitting device as to form an overlapping signal su bspace; quantizing the portion of CSI lying in the overlapping signal subspace; and sharing the quantized portion of CSI with at least one second transmitting device over the D2D communication.
  • CSI channel state information
  • the transmitting device may by any device capable of transmitting and receiving data within the MIMO system.
  • the step of sharing information such as the quantized portion of CSI, may include exchanging information among the transmitting devices in the MIMO system.
  • the method for adaptively sharing channel state information (CSI) in a multi-input multi-output system over a device-to-device (D2D) communication may comprise the step of determining, for each one amongst a plurality of user equipment devices, a respective signal subspace, the step of determining, for each one amongst a plurality of user equipment devices, whether the signal subspace of a user equipment device overlaps the signal subspace of another UE device as to form an overlapping signal subspace, the step of quantizing the portion of channel state information lying in the overlapping signal subspace, and the step of sharing the quantized portion of channel state information with each other amongst the plurality of user equipment devices over the device-to-device communication.
  • the step of determining a respective signal subspace comprises sharing a respective CSI statistics information with at least one second transmitting device.
  • the step of determining a respective signal subspace may comprise the step of sharing a respective channel state information statistics information with each other amongst the plurality of user equipment devices.
  • a specific quantization is designed for each user individually, which takes the CSI statistics of all the users into consideration. Knowing that a user communicating its CSI to another user only needs to convey the portion of the CSI that lies on the overlapping signal subspace, if the overlapping signal subspace has rank 1, the "useful" portion of the CSI reduces to a scalar such that it is sufficient for the user to transmit the scalar to the other user.
  • the step of sharing the respective CSI statistics information comprises sharing a channel covariance matrix of the first transmitting device with the at least one second transmitting device.
  • the step of sharing the respective CSI statistics information may comprise sharing a channel covariance matrix of each user equipment device or transmitting device with each other amongst the plurality of user equipment devices or transmitting devices.
  • the need for a CSI exchange depends on topology and varies according to differences between the covariance matrices of two users (e.g., street corner situation).
  • the portion of CSI that lies in the overlapping signal subspace with the other users can thus be quantized up to a specific resolution adaptive to the global channel statistics.
  • the signal subspace of each user can correspond to the dominant eigenvector of each respective channel covariance matrix.
  • the step of determining an overlapping signal subspace comprises projecting the channel covariance matrix of each transmitting device onto the respective signal subspace of the other transmitting device as to obtain an interference covariance matrix.
  • the step of determining an overlapping signal subspace may comprise, in a further implementation, projecting the channel covariance matrix of each user equipment device onto the respective signal subspace of the other user equipment device as to obtain an interference covariance matrix.
  • the properties of the covariance matrices can be exploited.
  • the overlapping signal subspace between a user and another one can correspond to the dominant eigenvector of the interference covariance matrix from the user to the other one.
  • the step of quantizing the portion of CSI comprises designing a respective channel codebook based on the interference covariance matrix in order to adapt the channel codebook to each one amongst the overlapping signal subspaces.
  • the channel codebook can adapt to the interference covariance matrix and hence to the overlapping signal subspace within the D2D CSI sharing.
  • each channel codebook is designed to have an adaptive size in terms of bits, the size being limited by the signaling capacity of the whole D2D communication and adaptive according to the whole CSI statistics information.
  • the portion of CSI that lies in the overlapping signal subspace with the other users can be quantized up to a specific resolution adaptive not only to the global channel statistics but also to the D2D signaling capacity.
  • the size is adapted to minimize the whole interference leakage in the corresponding communication network.
  • a smart partition of the D2D communication resources can be carried out. For example, if a first user needs to exchange a scalar with a second user, but a third user needs to exchange a long vector with a fourth user, then more D2D communication resource will be allocated to the latter user pair and it will result therefrom that they will have much larger channel codebooks.
  • the first transmitting device projects its own channel of direct communication between it and a base station, BS, onto its respective overlapping signal subspace with the at least second transmitting device, and quantizes the projected channel using the corresponding channel codebook in order to obtain the quantized portion of CSI.
  • each user equipment device may project its own channel of direct communication between it and a BS onto its respective overlapping signal subspace with the other user equipment device, and quantizes the projected channel using the corresponding channel codebook in order to obtain the quantized portion of CSI.
  • the portion of CSI on the overlapping signal subspace i.e., the interference su bspace, needs to be quantized.
  • the transmitting device transmits the quantized projected channel towards the at least one second transmitting device over the D2D communication.
  • each user equipment device transmits the quantized projected channel towards another user equipment device over the D2D communication.
  • the transmission from a user towards another user may be performed through a tunnel, which is directed from the user towards the other user.
  • a tunnel for D2D CSI exchange allows to significantly reduce the complexity of the channel quantization at the users.
  • the invention relates to a method for adaptively setting a distributed precoding in a multi-input multi-output system over a device-to-device communication, the method comprising applying the steps of the method as specified in the first aspect and the implementations of the first aspect, designing a respective precoder codebook for each transmitting device amongst a plurality of transmitting devices based on the respective channel covariance matrix of each transmitting device, and computing a respective precoder for each transmitting device based on the own channel state information of each user equipment device and the quantized portion of channel state information shared by the other user equipment devices.
  • a highly distributed D2D precoding can be obtained.
  • a precoder is computed based on the perfect direct link CSI and the partial cross link CSI from the other users, while being aware of the interference leakage to the other users in the corresponding communication network.
  • the precoder codebook of each user amongst the plurality of users can be adapted to the channel covariance matrix of either each respective user in a first embodiment or the plurality of users in a second embodiment.
  • the precoder codebook can be designed to place more vectors on the most likely transmission direction.
  • the precoder is selected from the respective precoder codebook in order to maximize the signal-to-leakage-and- noise ratio.
  • the selected precoder can then be transmitted from a user towards its serving base station.
  • the invention relates to a user equipment device for adaptively sharing CSI in a multi-input multi-output system over a D2D communication, wherein the transmitting device is adapted to determine a signal subspace; determine whether its signal subspace overlaps the signal subspace of at least one second transmitting device as to form an overlapping signal subspace, quantize the portion of CSI lying in the overlapping signal subspace, and share the quantized portion of CSI with at least one second transmitting device over the D2D communication.
  • the transmitting user equipment device is adapted to determine a signal subspace; determine whether its signal subspace overlaps the signal su bspace of another user equipment device as to form an overlapping signal subspace, quantize the portion of CSI lying in the overlapping signal subspace, and share the quantized portion of CSI with each other amongst a plurality of user equipment devices over the D2D communication.
  • the transmitting device is adapted to design a precoder codebook based on its channel covariance matrix, and compute a precoder based on its own CSI and the quantized portion of CSI shared by the at least one second transmitting device.
  • the user equipment device is adapted to design a precoder codebook based on its channel covariance matrix, and compute a precoder based on its own CSI and the quantized portion of CSI shared by the other user equipment devices.
  • the transmitting device is adapted to transmit the precoder towards a serving base station.
  • the invention relates to a computer program comprising program code for performing the method according to any one of the first and second aspects and/or any one of their respective implementation forms when executed on a computer.
  • the method can be performed in an automatic and repeatable manner.
  • the computer program can be performed by any one of the above apparatuses or devices.
  • the apparatuses or devices can be programmably arranged to perform the computer program.
  • Embodiments of the invention can be implemented in hardware, software or in any combination thereof.
  • Fig. 2 shows an overlapping signal subspace formed by the overlap between the signal subspaces of two UE devices according to a second embodiment of the present invention
  • Fig. 3 shows a vector diagram illustrating the quantization of the partial channel 3 ⁇ 4 of the UE device k into 3 ⁇ 4 according to a third embodiment of the present invention
  • Fig. 4 shows a signaling illustrating a distributive D2D enabled precoding for a single-cell multi-user massive MIMO system according to a fourth embodiment of the present invention
  • Fig. 5 shows a signaling illustrating a distributive D2D enabled precoding for a multi-cell multi-user massive MIMO system according to a fifth embodiment of the present invention
  • Fig. 6 shows a schematic flow diagram for adaptively sharing CSI in a MIMO system over a D2D communication according to a sixth embodiment of the present invention.
  • Fig. 7 shows a schematic flow diagram for adaptively setting a distributed precoding in a
  • a solution for obtaining an efficient CSI exchange amongst users might be to apply conventional channel quantization techniques to compress each user's channel and share it in the D2D network.
  • a conventional codebook can only adapt to the spatial correlation of a particular user, but cannot jointly exploit the spatial correlations of the other users. This may lead to have large codebook and feedback overheads. Thus, it is still possible to optimize these techniques to fully exploit the channel statistics of all the users in the network.
  • BS single base station
  • UE user equipment
  • K ⁇ Nt where no user scheduling is performed.
  • the single-cell multi-user massive MIMO system operates in a frequency-division duplexing (FDD) mode such that no channel reciprocity holds for a downlink CSI acquisition.
  • FDD frequency-division duplexing
  • the UE devices are assumed to be geographically close to each other such that they can communicate with each other by exploiting another air interface that does not interfere with the communication between the BS and the UE devices. It is clear, however, that the invention is not limited to the assumption a bove and that the principles described below apply to a more general system.
  • the received signal of U Ek is given by the following equation (1): where Ik denotes the (deterministic) la rge-scale cha nnel gain of U Ek, Sk is the symbol for UEk, Wk ⁇ C Nt is the precoder chosen by the U E device k (U Ek), rik ⁇ CN(0, 1) is the additive Gaussian noise, f the total transmission power and K is the number of U E devices served by the BS.
  • a bove UE devices are assumed to be geographically close to each other, it should be noted that the a bove simplified model of the single-cell multi-user massive M I MO system can also be extended to UE devices being distributed all over the area within the cell coverage. So, a two-layer precoding structure with user grouping may be used to justify the capa bility of inter-communication between the plurality of U E devices. With user grouping, we can guarantee that the UE devices in the same group can communicate with each other. With a two-layer precoding structure, the BS can process each group separately and the single-cell multi-user massive M I MO system degenerates to a single-user group case.
  • a tunnel which is directed from a UE device k (U Ek) towards another U E device j (UE j ) and is denoted by k -> j, is a point-to-point communication link for the U E device k (UEk) to transmit its message towards the U E device j (U E j ).
  • U Ek UE device k
  • U E j U E device j
  • U E j U E device j
  • the data rate between the tunnels k -> j and j -> k can be different, those both tunnels being generally asymmetric.
  • UEk a UE device k
  • U E j U E device j
  • Ckj a relatively small codebook
  • the size of the codebook Ckj is small with respect to the size of the codebook Ck obtained in a one-to-many broadcast signaling beca use the codebook size scales exponentially to the num ber of bits a nd it only needs to capture the statistical information of the two UE devices k and j (U Ek, UE j ) and not the statistical information between the U E device k (U Ek) and all the other UE devices. Furthermore, for each U E device j (U E j ), the set of codebooks ⁇ CijJi i j when in the point-to-point signaling is stored but not the set of codebooks ⁇ Ci ⁇ , ⁇ when in the one-to-many broadcast signaling. In other words, only the set of codebooks ⁇ Cij ⁇ , ⁇ j when in the point-to-point signaling is stored.
  • the precoder codebook C is a codebook that stores the precoding vectors, namely the precoders.
  • the UE device k UEk
  • the proposed distributive D2D ena bled precoding consists of two steps: a CSI exchange and an individual precoding.
  • the step of CSI exchange consists, for the U E device k (UEk), of quantizing its channel hk into and transmitting it towards the UE device j (UE j ) through the tunnel k -> j. It should be noted that the U E devices can also excha nge or share the CSI in a straightforward way through broadcasting.
  • the step of individual precoding consists for each UE device k (UEk) to choose the precoder Wk based
  • the UE device k chooses the precoder Wk from the precoder codebook C in order to maximize a signal-to-leakage-a nd-noise ratio (SLN ) through a SLN R precoding according to the following equation (2): where P is the total transmission power, Ik denotes the (deterministic) large-scale channel gain of UEk, and K is the number of UE devices served by the BS.
  • the SLNR precoding has the further advantage to provide a straightforward way for individual precoding while achieving a good performance.
  • Fig. 1 shows a signaling illustrating a distributive D2D enabled precoding for a single-cell multi-user massive MIMO system 100 according to an embodiment of the present invention.
  • the depicted system comprises two users, namely two UE devices, which are respectively denoted as UE1 and UE2, in addition to the single cell, which is denoted as BS.
  • the channel quantization can be performed using an interference subspace projection method. An interference subspace or overlapping signal subspace between a UE device and another UE device exists when the signal subspace of the UE device overlaps the signal subspace of the other UE device, as depicted in Fig. 2.
  • the UE device k (UE k ) first computes its partial channel by projecting its own channel h k of direct communication between it and the BS onto the interference subspace Uj of the UE device j (UEj) according to the following relationship (3): where U j ( ⁇ C Nt M J) is a semi-orthogonal matrix.
  • the matrix U j may contain the dominant eigenvectors Mj of the covariance matrix Rj of UEj.
  • the UE device k (UE k ) quantizes its partial channel , as shown in Fig.
  • UE device k such that only the channel direction h ,0 ' ) needs to be quantized.
  • the UE device k (U Ek) transmits 3 ⁇ 4 towards the UE device j (UE j ) over the D2D commu nication.
  • the signal su bspace Uk of the U E device k (UEk) ca n correspond to the dominant eigenvector of the cha nnel covariance matrix k.
  • the interference cha nnel covariance matrix Rk j from the U E device k (U Ek) to the U E device j (UE j ) on the CSI tunnel k -> j is given by the following relationship (6):
  • the channel codebook is then designed to be adaptive to the interference channel covariance matrix R ⁇ according to the following relationship (7): where ⁇ , is a random vector that has a standard complex Gaussian distribution and follows the distribution C (0, 1).
  • the dimension of the codewords in the channel codebook Ckj within the point-to-point signaling and in the channel codebook Ck within the one-to-many broadcast signaling can be reduced by projecting them onto the dominant su bspaces of Rkj and k, respectively.
  • Bd is the total capacity in bits for the D2D CSI sharing.
  • the invention has the advantage to save D2D signaling.
  • the signal subspaces of a first UE device (UE1) and a second UE device (UE2) are only slightly overlapping due to small angular spreads ( ⁇ , ⁇ 2 ) and large distance between each of both UE devices (UEl, UE2), as depicted in Fig. 4 showing a distributive D2D enabled precoding for a single-cell two-user massive MIMO system 200 according to an embodiment of the present invention.
  • the teachings of the invention allow to only quantize a small portion of CSI that might interfere the other.
  • the second UE device suffers from a much larger pathloss than the first UE device (UEl). That might be the case when UE2 is indoor and the signal is blocked, or when UEl is in an interference limited region and UE2 is in a noise limited region.
  • the invention allows to adaptively scale a much larger channel codebook C21 for UE2 and a smaller one Cu for UEl.
  • BS single cell
  • UE devices i.e., UE devices
  • the invention can be extended to a plurality of cells (BSs) serving a plurality of users (i.e., UE devices), as shown in the distributive D2D enabled precoding for a multi-cell multi-user massive MIMO system 300 of Fig.
  • BSs cells
  • users i.e., UE devices
  • h is the channel of direct communication between UEl and BS1 (hll), UEl and BS2 (hl2), UE2 and BS1 (h21) and UE2 and BS2 (h22), and h is the quantized channel of the channel h transmitted from UEl towards UE2 (hu) and from UE2 towards UEl (R21).
  • the distributed precoding of the invention can be performed to mitigate the inter-cell interference without real-time backhaul signaling between the BSs (BS1, BS2).
  • the CSI sharing amongst the users from the adjacent cells can be much more efficient and more users can be supported under limited D2D communication capacity in the multiple access channel (MAC), the D2D communication being performed over MAC shared by all the users.
  • Fig. 6 shows a schematic flow diagram for adaptively sharing CSI in a MIMO system over a D2D communication.
  • Fig. 7 shows a schematic flow diagram for adaptively setting a distributed precoding in a MIMO system over a D2D communication.
  • the present invention relates to a user equipment device and method for adaptively sharing channel state information and setting a distributed precoding in a multi-input multi-output system over a device-to-device communication.
  • a plurality of user equipment devices shares the channel state information statistics with each other and cooperatively design individual channel codebooks and precoder codebooks for the device-to-device channel state information exchange.
  • a respective precoder can then be computed and selected from the respective precoder codebook in order to maximize the signal-to-leakage-and-noise ratio. Only the portion of channel state information lying in the overlapping signal subspace is shared with each user equipment device and the shared portion of channel state information is quantized up to a resolution adaptive to the global channel state information statistics and the device-to-device signaling capacity.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
  • a suitable medium such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention concerne un dispositif équipement utilisateur et un procédé pour partager de manière adaptative des informations d'état de canal et configurer un précodage distribué dans un système à entrées multiples et sorties multiples sur une communication de dispositif à dispositif. Les dispositifs d'une pluralité de dispositifs équipements utilisateurs partagent les statistiques d'informations d'état de canal entre eux et conçoivent de manière coopérative des livres de codes de canal individuels et des livres de codes de précodeur pour l'échange d'informations d'état de canal de dispositif à dispositif. Un précodeur respectif peut alors être calculé et sélectionné à partir du livre de codes de précodeur respectif afin de maximiser le rapport signal sur pertes et bruit. Seule la partie d'informations d'état de canal se trouvant dans le sous-espace de chevauchement de signal est partagée avec chaque dispositif équipement utilisateur et la partie partagée d'informations d'état de canal est quantifiée jusqu'à une résolution adaptative correspondant aux statistiques d'informations d'état de canal globales et à la capacité de signalisation de dispositif à dispositif.
PCT/EP2016/069606 2016-08-18 2016-08-18 Mécanisme de partage de csi adaptatif pour précodage activé pour le d2d dans un système mimo massif WO2018033207A1 (fr)

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CN201680087537.3A CN109463042B (zh) 2016-08-18 2016-08-18 用于大规模mimo中d2d适用的预编码的自适应csi共享机制
PCT/EP2016/069606 WO2018033207A1 (fr) 2016-08-18 2016-08-18 Mécanisme de partage de csi adaptatif pour précodage activé pour le d2d dans un système mimo massif

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CN108242950A (zh) * 2018-04-19 2018-07-03 南京邮电大学 一种FDD Massive MIMO网络中基于D2D的CSI反馈方法
WO2019220180A1 (fr) * 2018-05-16 2019-11-21 Telefonaktiebolaget Lm Ericsson (Publ) Modification de diagramme de rayonnement en présence de sources d'interférence dans des systèmes duplex à répartition en fréquence (fdd)
WO2019220188A1 (fr) * 2018-05-16 2019-11-21 Telefonaktiebolaget Lm Ericsson (Publ) Précodage à entrées multiples et sorties multiples à multi-utilisateur (mu-mimo) de liaison descendante adaptatif utilisant un suivi de sous-espace de signal de liaison montante pour des systèmes d'antenne active (aas)
WO2020061964A1 (fr) * 2018-09-27 2020-04-02 Nokia Shanghai Bell Co., Ltd. Appareil, procédé et programme informatique réduction du surdébit de csi
US10840983B2 (en) 2018-06-15 2020-11-17 Samsung Electronics Co., Ltd. Apparatus and method for integrated beamforming in wireless communication system
CN112715009A (zh) * 2018-09-28 2021-04-27 华为技术有限公司 预编码矩阵的指示方法、通信装置及存储介质

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