Mitsubishi Electric R&D Centre Europe Patente

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The invention relates to a method for optimizing a capacity of a communication channel in a communication system comprising at least a transmitter (10), a receiver (11), and the communication channel (12) between the transmitter and the receiver. The transmitter (10) uses a finite set of symbols Ω = {ω₁, ..., ω_N} having respective positions on a constellation, to transmit a message including at least one symbol on said communication channel (11). The communication channel (11) is characterized by a conditional probability distribution p_Y|_X(ylx), where y is the symbol received at the receiver (12) while x is the symbol transmitted by the transmitter. More particularly, the conditional probability distribution p_Y|_X(y|x) is obtained, for each possible transmitted symbol x, by a mixture model using probability distributions represented by exponential functions. An optimized input distribution p_x(x) is computed, based on parameters of the mixture model, to define optimized symbols positions and probabilities to be used at the transmitter for optimizing the capacity of the channel.

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A method in a system comprising a resource scheduler and a set of devices is disclosed. Each device hosts at least one application, each application transmitting a stream of messages to at least one receiver. The method comprises : - obtaining (S 100), for each stream, parameters comprising one message lifetime, one message period and a last buffering time of a message of said stream before a given time window starts ; - deducing (S102) a set of configurations of said streams in said time window ; - computing (S 104), for each configuration, one configuration-based resource usage ratio per each stream ; - transmitting (S106) data to the resource scheduler, said data comprising each configuration with its computed set of configuration-based resource usage ratios.

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Method to control a power semiconductor module comprising: a. monitoring at least one operating parameter, b. only if said operating parameter is kept into a range and said operating parameter's range has an initial status, initiate a calibration stage, said calibration stage including i. measuring a first temperature sensitive electrical parameter; ii. decreasing the dead-time; iii. monitoring said operating parameter; iv. measuring a second temperature sensitive electrical parameter; v. only if - said operating parameter has been kept into said range and - the value of the second temperature sensitive electrical parameter corresponds to a lower value of the temperature, assigning the value of the dead-time; else only if - said operating parameter has been kept into said range and - the value of the second temperature sensitive electrical parameter corresponds to a higher value of the temperature, updating the status, vi. storing the dead-time with said operating parameter's range.

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The invention relates to the estimation of interferers of a radiofrequency system embarked in a moving vehicle having a known trajectory at each time n, with a non overlapping condition between the interferers considered as K independent active sources of interference having respective positions θ = [θ1,.., θk,.., θK], comprising steps of: - Obtaining observations Zn corresponding to measurement of interference from time instant 1 to N, and building an observation vector Z = [Z1,..,Zn,..,ZN], - Defining a latent variable Vn indicating which source is activated at moment n, to build a vector of latent variables V = [V1,.., Vn,.., VN], and - Implementing a Dirichlet process involving a Gibbs sampling with a Markov chain defined by vector V = [V1,.., Vn,.., VN], the sampling being repeated as follows until convergence: For n = 1, ...,N, if the observation Zn is already associated to a source (S3), remove (S4) observation Zn from its current associated source corresponding to latent variable Vn, and retrieve a position posterior of this source as the observation Zn is no longer belonging to this source; Draw (S5) a new value of latent variable Vn, based on a conditional probability P(Vn = k|V-n,Z-n,Zn) depending on whether a source k pre-existed or not; Associate (S8) the observation Zn to the source corresponding to latent variable Vn, and update the posterior distribution of the position for the source corresponding to latent variable Vn, - and, upon convergence of the algorithm, operating thereby a separation of the interfering sources into K independent measurement sets related respectively to the K interfering sources, and an estimation of each source position with the sources thus separated.

The invention relates to a method for optimizing a capacity of a communication channel in a communication system comprising at least a transmitter (10), a receiver (11), said communication channel (12) between the transmitter and the receiver, and a channel conditional probability distribution estimator (13). The transmitter (10) transmits messages conveyed by a signal associated with a transmission probability according to an input signal probability distribution estimated by said estimator (13). The transmitter (10) takes at least the messages as inputs and outputs the signal to be transmitted on the channel (12). The channel takes the transmitted signal as an input and outputs a received signal which is processed at the receiver (11) in order to decode the transmitted message. The probability distribution, noted p_Y|X(y|x), relates to an output Y, corresponding to the received signal, given an input X which corresponds to the transmitted signal X, and represents thus a channel conditional probability distribution of a probability of outputting a received signal Y, when the transmitted signal X is given. The probability distribution is estimated as an approximation of the channel conditional probability distribution p_Y|X(y|x) by using a functional basis of probability distributions, the channel conditional probability distribution being thus approximated, for each possible signal sent by the transmitter, by a mixture model with mixing probability distribution from said functional basis. The probability distribution for each possible transmitted signal is then estimated from at least output signals received at the receiver, and by using a collapsed Gibbs sampling relying on a Dirichlet process.

The present invention concerns a device and a method for sensing an overtemperature of a power semiconductor. The invention:- provides a current pulse source through control electrodes of the power semiconductor,- duplicates the current provided by the current pulse source and provides the duplicated current to an emulating device,- compares the voltage across the control electrodes to the voltage across the emulating device,- notifies the result of the comparison.

The present invention concerns a method and a device for estimating a level of damage or a lifetime expectation of a power semiconductor module comprising at least one die that is mechanically, thermally, and electrically attached to a substrate, composed of plural layers of different materials. The invention: - obtains power losses of the power semiconductor module, - obtains the temperature in at least two different locations of the power semiconductor module, - estimates a thermal model between the at least two different locations of the power semiconductor module using the determined power losses and the obtained temperatures, - determines if a notification indicating the level of damage or the lifetime expectation has to be performed according to the estimated thermal model and a reference thermal model. - notifies the level and location of damage or the lifetime expectation if the determining step determines that the notification has to be performed.

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Method for estimating degradation of a wire-bonded power semi-conductor module (1) comprising:a) obtaining an indicator of degradation (Degr);b) estimating (11) an estimated indicator of degradation (Degr) by a temporal degradation model;c) obtaining (3) a set of on-line measure (X);then,d1) converting (13) the on-line measure (X) into a deducted indicator of degradation (Degr) by an electrical equivalence model, ande1) computing (15) a deviation between estimated and deducted indicator of degradation (Degr; Degr);and/ord2) converting (13) the estimated indicator of degradation (Degr) into a set of on-line estimation (X), ande2) computing (15) a deviation between set of on-line measure and estimation (X; X); andf) correcting (17) the estimated indicator of degradation (Degr) into a corrected estimated indicator of degradation (Degr) in function of the computed deviation.

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The present disclosure relates to a method (50) for transmitting a data stream from a transmitting device (30) to a receiving device (40), the data stream comprising m data sub-streams, said method (50) comprising:- (S51) encoding the data sub-streams with respective polar codes, such as to produce m polar-encoded data sub-streams,- (S52) modulating the m polar-encoded data sub-streams onto symbols of a multilevel modulation comprising m levels defining 2^m different symbols, such as to produce a symbol stream,- (S53) transmitting the symbol stream to the receiving device (40), wherein the 2^m symbols of the multilevel modulation are distributed in the complex plane such that they are regularly spaced along the real axis and the complex axis by a spacing factor K, the predetermined labeling function Z being such that Φ(Z) < 1.7^m × (0.0425 × m - 0.06), expression in which: ΦZ=∑i=1m∑c1,…,cm∑ciʹ,…,cmʹ\ci,…,cme−4K2Zc1,…,cm−Zc1,…,ci−1,cʹi,…,cʹm2

Self-diagnostic method (100) of open-circuit fault, in power switching blocks of a modular inverter comprising a plurality (k=1 .. n) of blocks (31a, 32a, 33a, 34a, 31b, 32b, 33b, 34b, 31c, 32c, 33c, 34c) in parallel per phase leg (5, 5a, 5b, 5c), and being provided with temperature sensors (6), said method comprising:- sampling and storing (130) temperatures data Tkp of said n blocks (k=1 .. n) in a phase leg measured by said temperature sensors at relevant sampling times t_SD with a relevant sampling interval Δt_SD;- comparing (150) said temperature data Tkp of each (k) block with previously sampled and stored temperature data Tkp−1of said each (k) block and considering a possible fault (FF) on one of said blocks if the following condition is not fulfilled: Tkp∈Tkp−1±Thwhere Th is a predefined temperature deviation threshold ;or- comparing (250) current temperature data Tkp of each (k) block with current average temperature data 1n−1∑i=1nTip and considering a fault (OF) on one of said blocks if the following condition is not fulfilled: Tkp∈1n−1∑i=1nTip±ThAV,i≠kwhere Th_AV is a predefined average temperature deviation threshold.The invention concerns also a test comprising a shoot-through procedure to identify open circuits in a block.

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