Mitsubishi Electric Corporation

Mitsubishi Electric R&d Centre Europe B.v.

Qianrui Li

Nicolas Gresset

David Gesbert

Jean-Christophe Sibel

Artem Boryskin

Akl Charaf

Paul De Kerret

Hervé Bonneville

A method evaluates channel information of a database, DB, the DB channel information being associated to a target area and being representative of expected characteristics of a wireless communication channel in the target area to be provided to one or more communication devices. The method includes: obtaining, by a processing circuit, all or part of the DB channel information from the database; obtaining, by the processing circuit, observed channel information representative of characteristics of the wireless communication channel experienced by a first communication device in the target area; computing, by the processing circuit, a reliability indicator for the DB channel information for the target area, by comparing the DB channel information and the observed channel information and determining a timing information for the reliability indicator.

Method for evaluating channel information of database, communication device, database, and wireless communication system

A value of a first figure of merit representative of routing performance throughout the multi-hop network is obtained. Independently of the values of the first figure of merit, a value of a second figure of merit representative of transmission performance between the base station and the multi-hop network for each candidate configuration of transmission between the base station and the entry points of the multi-hop network is computed. Values of a third figure of merit representative of a trade-off between routing performance throughout the multi-hop network and transmission performance between the base station and the multi-hop network is then computed by combining values of the first figure of merit and of the second figure of merit. Then, the candidate configuration which shows the best value of the third figure of merit is selected to perform the transmission of data.

Method and system for performing transmission of data between base station and terminal

The invention relates to a method of massive MIMO communication, comprising: —forming transmission beam set (Φ), by a base station (BS), with privileged channel directions; —designing additional beam set (Θ) for optimizing the transmission beam set, so as to detect channel direction change outside the privileged channel directions.

Method, base station, system and computer program for massive MIMO communication

The invention comprising: jointly determining an analog precoding matrix Fand a plurality of multi-user groups G, each multi-user group Gbeing associated to a respective subcarrier l, each multi-user group Gcontaining a plurality of receivers to be jointly served for a data transmission on the respective subcarrier l; and using the analog precoding matrix Ffor processing at least one signal to transmit; characterized in that the joint determination comprises: /a/ optimizing a beamforming function &#x192;(F, G. . . , G) with respect to the analog precoding matrix F, the multi-user groups Gbeing fixed; /b/ optimizing a scheduling function g(G,F) with respect to the multi-user groups G, a value of the analog precoding matrix Fbeing fixed; wherein /a/ and /b/ are iteratively repeated.

Method for enabling analog precoding and analog combining

A method for enabling hybrid beamforming in a communication system including a transmitter being able to serve a plurality of receivers, wherein a frequency band comprises at least one subcarrier, wherein each receiver is associated to a set Cprec,k of analog precoding codewords, said method comprising: &#x2014;for each receiver, computing () an analog precoding matrix FRF k associated to said receiver; said computation () comprising: /a/ for each subcarrier, performing () a Singular Value Decomposition, SVD, on a channel matrix associated to said receiver and to said each subcarrier; /b/ for each subcarrier, determining a first decomposition matrix Vk(1) based on the relative SVD; /c/ determining () an analog precoding codeword which optimizes a first function g1(Vk(1), . . . , Vk(L), F) of Vk(1), . . . , Vk(L) and F, for a plurality of F E Cprec,k, wherein L denotes a number of subcarriers.

Receiver, communication system, and method implemented by computer for enabling both analog and digital beamforming in communication system

For determining parameters for configuring a regularized zero-forcing precoder aiming at being applied for transmitting data from a plurality of transmitters to a plurality of receivers via a MIMO transmission channel in a wireless communication system, and more particularly in a scope of massive MIMO approach, a first phase comprises: obtaining long-term statistics about observations of the MIMO transmission channel, and obtaining a power scaling factors aiming at meeting a power constraint P, by solving an optimization problem as a function of a signal to noise ratio asymptotic expression from the standpoint of each receiver. Then, a second phase comprises: obtaining an estimation of the MIMO transmission channel, and configuring the regularized zero-forcing precoder using the power scaling factors determined in the first phase as well as the obtained estimation of the MIMO transmission channel.

Method for determining parameters for configuring regularized zero-forcing precoder

For setting cooperation parameters of a communication system including a plurality of node devices interconnected by links and adapted to be respectively configured according to said cooperation parameters, a cooperation phase comprises: gathering measurements data representative of measurements of the random variables; optimizing the figure of merit for determining said cooperation parameters, on the basis of the obtained measurements. At least one link implying quantization operations relying on a codebook for gathering said measurements data and/or for providing said cooperation parameters, a pre-processing phase comprises beforehand: obtaining statistics data relative to a probability distribution of said random variables; and determining every codebook on the basis of the figure of merit, such that the figure of merit is statistically optimized according to the obtained statistics.

Method for setting cooperation parameters of communication system, computer program thereof, information storage means thereof, and communication system including plurality of node devices

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Rennes, France

Qianrui Li