83results about How to "Increased operational complexity" patented technology

The invention discloses a co-channel full-duplex system based on MPPSK modulation. After the system isolates receiving and sending signals at the radio-frequency head normally, cancellation conducted on leakage self-interference signals is finished on a digital baseband; the cancellation method is conducted after conducting shock filter on MPPSK receiving and sending aliasing signals, extracting and multiplying by coherent carrier, band-pass filtering and digitizing, the result of initial channels of all self-interference channels between the output end of a modulator and a receiver ADC is estimated before formal communication, self-interference offset signals are rebuilt by the adoption of the estimated result, further residual errors are filtered out with the combination of methods of coding rate filtering and double matched filtering of a method of shock filtering-multiplying by the coherent carrier-band-pass filtering-coherent demodulation, and MPPSK receiving signals are demodulated reliably. The co-channel full-duplex system based on MPPSK modulation is free of radio-frequency self-interference cancellation, has low requirements for the dynamic range and sampling rate of the ADC, has high isolation degree for the self-interference signals, and is simple in structure, low in complexity, high in spectrum efficiency and good in demodulation performance.

The invention relates to a block chain data transmission method and a block chain data transmission system, and the method comprises the steps: carrying out the Hash operation of at least two times ontransaction data, and obtaining first abstract information; encrypting the first abstract information for multiple times by using at least two private keys to obtain digital signature information ofthe transaction data; and sending the transaction data, the digital signature information of the transaction data and at least two public keys corresponding to the at least two private keys to the block chain network node. According to the scheme of the invention, at least two Hash algorithms are adopted; the Hash internal operation complexity and the Hash output length are improved; any input change can generate different outputs. Compared with the prior art, the digital wallet has the advantages that attack resistance is improved, high efficiency is achieved on the premise that conflict resistance is not sacrificed, at least two private keys are utilized for multiple times of encryption, in other words, the information credibility is improved through the multiple digital signature technology, information can be fully verified not to be forged, tampered in the transmission process is avoided, and the safety of the digital wallet is improved.

The present invention discloses a polar code-repeat code cascade error correction coding method. At a transmit end, the repeat code is used as an outside code, and the polar code is used as an inside code; and a decoder of a receive end uses a correction successive cancellation list (SCL) decoding algorithm to decode. In terms of correction performance, the frame error rate performance of the coding method provided in the present invention is highly stronger than the polar code frame error rate performance of the SCL decoding algorithm or a cyclical redundancy check (CRC)-aided SCL decoding algorithm, and the frame error rate far exceeds the unsurpassed maximum likelihood limit of the SCL decoding algorithm. In terms of engineering implementation, the outside code uses the repeat code, the storage complexity of the outside code coder is very low, the coding is simple, the correction SCL decoding algorithm is adopted for decoding, bit determining of the inside code-polar code and bit determining of the outside code-repeat code are performed jointly, and the decoding complexity is not increased compared with that of the original SCL decoding algorithm and the CRC-aided SCL decoding algorithm, so that the engineering is easy to implement.

The invention discloses a network failure diagnosis method based on a selective hidden Naive Bayesian classifier, comprising: (1), obtaining history data from a network history database, wherein the history data comprise a symptom variable set and a failure class variable set; (2), constructing a selective hidden Naive Bayesian classifier prediction model, determining corresponding most related symptom variable set according to every symptom variable in the symptom variable set; (3), automatically learning classifier parameters by the selective hidden Naive Bayesian classifier through training the history data; (4), in failure diagnosis, estimating the test data by using the selective hidden Naive Bayesian classifier so as to obtain corresponding final failure diagnosis result. Through executing the network failure diagnosis method of the invention, the problems in the existing network failure diagnosis that the operation complexity is high and the network diagnosis result is great in deviation are effectively solved; the network diagnosis accuracy is greatly improved; the operation complexity is further reduced, and better learning capability and fault-tolerant character are kept at the same time.

The invention provides a technology based on a server terminal, and discloses a native APP, Web APP and Wechat-similar APP information synchronization system. Data interaction is carried out on different client terminals to adapt to the requirements of the different client terminals for network transmission. Data interaction is carried out on the different native APP, Web APP and Wechat-similar APP client terminals, communication interfaces are modularized according to network protocol types, and part of data are selectively synchronized to the specified client terminals. The convenient system is provided for information issuing and data maintenance of a traditional type industry, and the manual operation cost is greatly reduced through data synchronization; a flexible, convenient and rapid tool for data synchronization among the different client terminals is created for the IT same industry, the reusability of codes is improved, and the manual development cost is greatly reduced.

The application provides a Bluetooth connection control system. The system comprises an authentication server, a Bluetooth control device and Bluetooth mobile equipment; the authentication server comprises a storage unit for associatively storing identification information of the Bluetooth mobile equipment and predetermined authentication information; and an encryption authentication data generation unit for determining the predetermined authentication information corresponding to the identification when receiving an authentication connection request including the identification information ofthe Bluetooth mobile equipment, and generating encryption authentication data according to the predetermined authentication information; the Bluetooth control device comprises a connection unit connected to the Bluetooth mobile equipment according to a MAC address of the Bluetooth mobile equipment; the Bluetooth mobile equipment comprises a connection control device allowing the Bluetooth controldevice to be connected to the Bluetooth mobile equipment according to the MAC address; and an authentication unit for authenticating the connection according to the encryption authentication data. According to the system provided by the application, the security of the Bluetooth connection can be improved, and the operation complexity and the limit operation feasibility cannot be increased.

A method for implementing carrier frequency offset correction base on large-point FFT. Firstly, the receive signal is orthogonally mixed, convert to I, Q two-way signal, and then combining the outputsignals of I and Q into complex signals, the spectrum characteristics of complex signals are estimated by using the twice FFT matrix method, and then finding the position corresponding to the maximumpeak point on the spectrum characteristic and calculating the frequency offset value, Finally, the frequency offset value is converted into the frequency control word of the voltage controlled oscillator, so as to generate the same frequency as the frequency offset value. After passing through the feedback loop, I and Q signals are compensated by orthogonal mixing, and the high-frequency components are eliminated through the low-pass filter to output the correct baseband signal after the frequency offset is eliminated.

The present invention discloses a network online water quality heavy metal analyzer, which comprises an industrial grade integrated control unit, a detection unit, an automatic sampling unit, a water sample pre-treatment unit, an external input and output unit, and a network module, wherein the industrial grade integrated control unit can automatically control the detection unit, the automatic sampling unit, the water sample pre-treatment unit and the external input and output unit through communication interfaces. According to the present invention, the modularization idea is adopted so as to conveniently expand and reduce the number and the type of the units, assemblies in the units are independent so as to be conveniently expanded and reduced, the low cost standard network cabinet is adopted so as to reduce the whole cost and conveniently process data, and to adapt to remote control requirements, the network module can conveniently perform data transmission through the wired and wireless network.

The invention provides a method for acquiring a vehicle speed from a road monitoring video. The method comprises five main steps: respectively pre-treatment, mapping relationship establishment, vehicle projection sequence extraction, vehicle space positioning and quick-frozen fitting.

The invention discloses a production system for extracting crude helium from natural gas and co-producing liquefied natural gas. The production system comprises a first-stage helium extraction unit, a second-stage helium extraction unit, a third-stage helium extraction unit, a mixed refrigeration system and a nitrogen refrigeration system, wherein the first-stage helium extraction unit, the second-stage helium extraction unit and the third-stage helium extraction unit are connected through pipelines. The first-stage helium extraction unit comprises a heat exchanger I, an LNG storage tank, a rectifying tower I, and a condenser I and a reboiler I which are arranged at the tower top and the tower bottom of the rectifying tower I correspondingly. The second-stage helium extraction unit comprises a heat exchanger II, a rectifying tower II, and a condenser II and a reboiler II which are arranged at the tower top and the tower bottom of the rectifying tower II correspondingly. The third-stage helium extraction unit comprises a heat exchanger III, a rectifying tower III, and a condenser III and a reboiler III which are arranged at the tower top and the tower bottom of the rectifying tower III correspondingly. According to the production system, the technical scheme of mixed refrigerant circulating refrigeration and three-stage rectification helium extraction is adopted, helium is produced as a main product, a small part of liquefied natural gas and liquid nitrogen products are produced as byproducts, and the problems of high investment, high operation cost and the like in an existing helium extraction and liquefied natural gas co-production process can be effectively solved.

The invention discloses an adaptive awakening mechanism for sleeping nodes in a network containing inaccurate state information. The awakening mechanism is characterized in that the optimal awakening time of the sleeping nodes under the condition that the delay constraint is satisfied is computed according to the delays which data packets experience and evaluation on the downstream path delay; and the statistic characteristics of the inaccurate state information of the network are taken into full consideration during computation and the confidence interval of random state parameters is used for evaluating the upper and lower limits of the numerical value of the inaccurate state information in the probability sense, thus effectively increasing the computational accuracy. While ensuring that data delays conform to constraint, the awakening mechanism shows excellent and stable performances in the aspect of saving network energy by optimizing the total sleep time and state transition frequency of the nodes in the network.