39results about How to "Against interference" patented technology

The invention discloses an orthogonal time-frequency space OTFS modulation equalization method with low computational complexity, which is a method for equalizing interference between two-dimensionalcodes of an orthogonal time-frequency air conditioner under a time-frequency double-selection channel based on iterative parallel interference elimination of a linear minimum mean square error. The method can effectively utilize the covariance matrix of the reconstructed symbol to alleviate the influence of the interference between the residual two-dimensional codes on the OTFS system performance,so that the time-frequency two-dimensional gain can be better utilized, and the system reliability can be improved; time-frequency two-dimensional decomposition and octyl Fourier transform are adopted to carry out first-order Newman series approximation on the inverse matrix in LMMSE-PIC, so that the calculation complexity of the equalization method is reduced, and the equalization method only has a directrix relation with the total number of transmission symbols and is irrelevant to the channel sparsity, so that the system effectiveness is improved. The orthogonal time-frequency air conditioning system has the advantages that the time-frequency two-dimensional diversity gain of the orthogonal time-frequency air conditioning system can be remarkably improved under the time-frequency double-selection channel, the receiver performance of the non-ideal channel decoder during feedback is improved, and the popularization and application prospect is good.

The present application relates to a sunscreen detector, a detection device and a method. The detection device obtains a first differential image corresponding to the specific chemical through the reference light signal in the reference optical band corresponding to the specific chemical and through the reference light source and the image acquisition device, and is used to determine that the specific chemical is in the specified chemical The thickness distribution on the area, so as to realize the combination of optical measurement technology and image processing technology to provide a general and reliable detection method for various medical preparations, cosmetics or other chemicals suitable for the human body to judge the smearing of chemicals. It extends to the design advantages of smart terminal equipment and household daily necessities, and can effectively combat interference caused by external environmental factors.

The invention relates to a high-precision pulse power detection module, which includes a radio frequency circuit for receiving radio frequency input sampling signals and radio frequency output sampling signals, the output end of the radio frequency circuit and the input of the detection circuit for receiving sampling voltage V1 and sampling voltage V2 The output terminal of the detection circuit is connected with the fault indication circuit. The present invention can simultaneously detect the over-temperature contact, voltage V1 sampling, voltage V2 sampling, radio frequency input sampling, and radio frequency output sampling, and can monitor the input and output power changes of the front-stage components in real time, and then accurately judge whether the input power and output power are faulty, It can monitor the stability of the voltage in real time, and then accurately judge whether it is an undervoltage state caused by a voltage drop, resulting in no power output, which can effectively and quickly find the cause of the fault and facilitate maintenance.

The invention discloses a channel estimation method for single carrier frequency domain equalization under a low energy dispersion multipath channel. A problem of channel estimation performance loss of an existing single carrier equalization system under a low energy dispersion multipath environment can be improved effectively by using the channel estimation method disclosed by the invention. Segmentation is carried out through setting a value of an approximate signal to noise ratio, different numbers of useful signal paths and different threshold values are selected in different signal to noise ratio intervals, and then time domain noise reduction processing of channel estimation is carried out. The channel estimation method disclosed by the invention is not only applicable to extracting the useful signal paths accurately in a high signal to noise ratio environment. In addition, when most of the useful signal paths are possibly submerged in noises and cannot be distinguished in a low energy multipath channel environment, the low energy multipath channel environment is divided into a high signal to noise ratio interval, a middle signal to noise ratio interval and a low signal to noise ratio interval by adopting the method, the useful signal paths can also be extracted accurately, and the performance of channel estimation is improved.