Mitsubishi Electric R&D Centre Europe Patente

Embodiments include digital signal processing units, a transmitting device for a wireless communication system and methods of processing a composite time domain signal having a plurality of parallel and independent signals that collectively form a parallel communication. It is proposed a new waveform configuration suitable for 5G and that is able to reduce out-of-band (OOB) emissions which are received on a first time domain signal associated to a first sub-band where the OOB emissions originate from an OFDM time domain signal associated with a second sub-band adjacent to the first sub-band. The proposed solution is partly based on filtered-OFDM with the exception that sub-band filtering is not performed on all the samples of the stream of OFDM symbols. Instead, filtering is performed only, for each OFDM time domain signal, where transition occurs between consecutive OFDM symbols.

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Embodiments include devices and methods for processing data packets including a data frame defined according to IEEE 802.1 Time Sensitive Networking standards. It is proposed to use the source MAC address field of the header of the so defined data frames in order to include an error detection mechanism that provides coverage for the header of the data frames. Thereafter, the cut-through switching method can be used in the forwarding process as soon as the destination MAC address of the data frame has been examined and error detection check on the header of the data frame is performed.

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For determining time and frequency resources to be used for performing transmissions in a wireless communications network, the transmissions being performed via time and frequency resources of the wireless communications network according to an initial grid representation, a first device performs: obtaining groups of time and frequency resources of the wireless communications network so as to form a redrawn grid; allocating time and frequency resources according to the redrawn grid and to a frequency hopping criteria; and providing signalling information representative of the time and frequency resources that have been allocated according to the redrawn grid. In order to determine which time and frequency resources of the initial grid to be used for performing said transmissions, a second device performs: obtaining the signalling information so as to determine the time and frequency resources that have been allocated according to the redrawn grid; and applying a predetermined pattern mask onto the determined time and frequency resources that have been allocated according to the redrawn grid.

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A polar-code based encoder is used to perform a transfer of useful data to a polar-code based decoder via a Binary Discrete-input Memory-less Channel. The Divide and Conquer structure consists of a multiplexer having useful data bits and a set of frozen bits as inputs followed by a polarization block of size N = 2 L , wherein the polarization block of size N comprises a set of front kernels followed by a shuffler and two complementary polarization sub-blocks of size N / 2 with a similar structure as the polarization block of size N but with half its size. A dynamically configurable interleaver is present between the shuffler and one and/or the other of the complementary polarization sub-blocks at each recursion of the Divide and Conquer structure. The configuration of the dynamically configurable interleavers is dynamically modified according to changes detected in the Binary Discrete-input Memory-less Channel.

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For determining, in a distributed fashion, precoders to be applied for performing transmissions of data between a plurality of transmitters and a plurality of receivers via a global MIMO channel H of a wireless communication system, said precoders jointly forming an overall precoder V, each and every j -th transmitter perform: gathering long-term statistics of CSIT errors incurred by each one of the transmitters; obtaining short-term CSIT related data and building therefrom its own view H ( j ) of the global MIMO channel H; determining an estimate V ( j ) of the overall precoder V from the short-term CSIT related data; refining the estimate V ( j ) on the basis of the gathered long-term statistics of CSIT errors so as to obtain a refined precoder V ( j ) that is a view of the overall precoder V from the standpoint of said j -th transmitter, further on the basis of its own view H ( j ) of the global MIMO channel H , and further on the basis of a figure of merit representative of performance of said transmissions via the global MIMO channel H.

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The invention relates to a method for determining a presence of a locking signal in a signal received by an optical receiver device, the optical receiver device being intended to be used in an optical communications network, the locking signal being a signal exchanged by optical communication devices of the optical communications network in a phase preceding setting up communications between said optical communication devices. The presence of the locking signal is determined by obtaining the direct current component or the component at twice a frequency at which the locking signal is supposed to be modulated, and by obtaining the contribution of the communication signal, if any, on said component.

For determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting optical signals to a second device via an optical band-pass filter, the second device having an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter, said carrier wavelength and/or said passband of the optical band-pass filter being a priori unknown, a monitoring device performs: monitoring an evolution of a difference level between codewords received by the second device via said optical signals and corresponding codewords transmitted by the first device; and determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of said monitoring.

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For transmitting data from a plurality of transmitters to a plurality of receivers via a MIMO channel, precoders to be respectively applied by said transmitters are determined in a distributed fashion. Said precoders jointly form an overall precoder. Said transmitters are interconnected by coordination links implying quantization operations. Each and every transmitter: determines (S302) an initial version of the overall precoder from its own view of the MIMO channel; transmits (S303) to the other transmitters quantized versions of the initial version, thus implying quantization errors; receives (S304) initial versions of the overall precoder obtained by the other transmitters; obtains (S305) statistical distributions of the quantization errors; optimizes (S306) matrices parameters of a multivariate combination function combining the quantized versions of the initial versions of the overall precoder, so as to obtain an adjusted own view of the overall precoder, wherein the matrices parameters are optimized with respect to an estimation of a figure of merit representative of performance of the transmissions; and transmits (S307) the data by using the adjusted own view of the overall precoder.

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The present invention concerns a method for controlling the operation of a multi-die power module composed of at least two dies connected in parallel. The method comprises the steps of: - obtaining the current flowing in the multi-die power module, - obtaining a loss profile that is related to the dies of the multi-die power module, - estimating from the measured current flowing in the multi-die power module, the losses of one die when no die is passivated, when the die is passivated, and when at least one other die is passivated, - determining if and which die has to be passivated from the estimated losses and from the loss profile - passivating the die which has to be passivated if a die has to be passivated.

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