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88results about How to "Avoid multiplication" patented technology

Method for checking the compliance of an optical characteristic of an ophthalmic lens and associated device

A method for checking the compliance of a checked optical characteristic of a checked ophthalmic lens (30) relative to an expected optical characteristic, from a non-deformed pattern (40) and a deformed pattern (20) each having a non-uniform contrast, the method includes the steps of: a) determining (A) an image pattern (50), which is the image of the deformed pattern through the checked ophthalmic lens, in predefined optical conditions, b) combining (B) the image pattern with the non-deformed pattern to form a test pattern (60), c) comparing (C) the test pattern with at least one reference pattern (70), and d) deducing (D) the compliance of the checked optical characteristic with the expected optical characteristic on the basis of the preceding comparison. A device for implementing such a checking method is also described.
Owner:ESSILOR INT CIE GEN DOPTIQUE

Totally blind recognition method for coding parameter of convolutional code

InactiveCN103312457AAvoid randomness related phenomenaReduce the effects of noiseError preventionBit-lengthConvolutional code
The invention discloses a totally blind recognition method for a coding parameter of a convolutional code, which mainly solves the problems of incapability of realizing totally blind recognition and high calculation complexity existing in the prior art. The technical scheme provided by the invention is that: (1) the code length n, the input information bit length k and the register length m are solved according to the mutual check relationship between a convolutional code coder and an information code word; (2) when the code rate k / n is 1 / n, two adjacent bits of the code word in the convolutional code bit stream are taken in sequence to construct an analysis matrix C, and fast Walsh-Hadamard transformation is used for the analysis matrix C to solve a generator matrix G; and (3) when the code rate k / n is (n-1) / n, the first to (n+1)th bits of the code word in the convolutional code bit stream are taken to construct an analysis matrix C, and fast Walsh-Hadamard transformation is used for the analysis matrix G to solve a basic check matrix H; and thus, the totally blind recognition for the coding parameter of the convolutional code is finished. According to the totally blind recognition method, the problem of totally blind recognition for the coding parameter of the convolutional code under the conditions of knowing no priori knowledge and containing an error code are solved well, and the operation complexity is simplified; and the totally blind recognition method can be used for multi-cast communication and intelligent communication.
Owner:XIDIAN UNIV

Coding and decoding method of transmission control protocol based on network coding

The invention discloses a coding and decoding method of a transmission control protocol based on network coding. The method optimizes the coding method at a network coding layer, distinguishes normaldata packets or redundant packets, adopts different coding ways for different types of data packets, and realizes the coding for normal coding data packets by adopting a direct exclusive or way; and for redundant data messages, the coding coefficients are randomly selected from a certain row in a Vandermonde matrix, and redundant coding data packets are obtained according to the coding coefficients by using a linear coding method, so that the coding complexity is reduced; in a network layer, the design of the head of the coding data packets is optimized, and the coding coefficients and parameters needed for decoding are considered comprehensively, which shortens the overhead of coding the heads and improves the transmission efficiency; and a decoding algorithm is optimized in the network coding layer, which makes a Gaussian elimination process more simple, thereby reducing the decoding complexity.
Owner:SOUTHWEST JIAOTONG UNIV

Field-effect transistor with horizontal self-aligned gates and the production method therefor

A field-effect transistor including: a support substrate, an active area forming a channel; a first active gate which is associated with a first face of the active area; source and drain areas which are formed in the active area and which are self-aligned on the first gate; a second insulated gate which is associated with a second face of the active region opposite the first face of the active region. According to the invention, the second gate is self-aligned on the first gate and, together with the first gate, forms a mesa structure on a support substrate.
Owner:COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Large frequency deviation evaluation and correction method of orthogonal frequency multiplexing signal carrier

The invention relates to a large frequency deviation estimation and correction method for quadrature frequency division multichannel signal carriers, comprising the following steps: time domain frequency deviation estimation of frequency deviation, and time domain frequency deviation correction according to estimation results. The invention also comprises the following steps: smooth processing of the time domain frequency deviation estimation is performed, namely a low pass filter is adopted to smooth down peak values and valley values of time domain frequency deviation estimation values; after the time domain frequency deviation correction, Fourier transformation is performed; frequency domain frequency deviation estimation is performed on transformation results; frequency domain frequency deviation estimation results or time domain frequency deviation estimation results after smooth processing participate in time domain frequency deviation correction once again. The method of the invention overcomes limitation of the prior frequency domain algorithm on frequency deviation estimation and has the advantages of capability of processing large frequency deviation, capability of guaranteeing smooth signal processing, capability of quickly tracking frequency deviation caused by movement, and capacity of being conveniently realized in an integrated circuit design.
Owner:李文革

Iterative clipping and filtering method for reducing peak-to-average ratio of OFDM signals

The invention provides an iterative clipping and filtering method for reducing the peak-to-average ratio of an OFDM signals. The method comprises the steps of: firstly, calculating OFDM time domain signal power, and carrying out clipping on the real parts and imaginary parts of the OFDMs exceeding a power threshold P0 according to a clipping factor [alpha]; secondly, converting the OFDM time domain signals after the clipping into OFDM frequency domain signals by means of FFT conversion, and carrying out frequency domain filtering; then converting the signals after the frequency domain filtering into OFDM time domain signals by means of IFFT conversion, and finishing one time of iterative clipping and filtering processing; and finally, according to a maximum iterative number, repeating the above iterative clipping and filtering process. In the method, an OFDM system does not need to transmit additional information, additional processing on the OFDM signals on a receiving end for compensating the influences of the clipping processing on a sending end is not needed, the clipping factor [alpha] is suitably selected, the clipping processing is completed only by means of additive operation, and frequency domain filtering can be directly carried out on the processing result by means of the FFT conversion; in addition, in the iterative clipping and filtering process, a work clock multiplexing FFT/IFFT conversion unit higher than a sampling rate is adopted, and realization resources inhibited by the peak-to-average ratio are saved.
Owner:BEIJING RES INST OF TELEMETRY +1

Modular air inlet lip with electric defrosting for a turbojet pod

A lip of an air inlet of a turbojet pod intended to be fastened to an air inlet downstream structure includes at least one electric heating element for defrosting. The electric heating element being fitted with at least one electrical connector able to be connected to at least one corresponding electricity supply connector of the downstream structure. The lip breaks down into at least two identical structures set end-to-end on a periphery of the air inlet.
Owner:AIRCELLE
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