81results about How to "Reduce system overhead" patented technology

Embedded type distributed simulation platform based on HLA facing to space flight measurement and control and its realization method

The invention relates to an embedded distributing emulation platform basen od HLA faced to space instrumentation and command and a method for carrying out same. The platform supports a distributed interactive simulation and is developped to high application based on HLA/DIS bottom protocol, and carrys out parallel running of multi-emulation platforms, and can record and playback the display and emulation process of two-dimension situation and three-dimension virtual environment for measurement and control environment and measurement and control object during the emulation process. The specific fuction of system includes: carrying out the emulation for measurement and control environment and measurement and control object by the emulation environment platform; adding, replacing or modifying the dynamic model, behavior, sensor and countermeasure of emulation body in the emulation engine by the assemble structure; having expandability; the platform development package having the application interface independently to the protocol; having the functon of route prediction and smoothness in order to display image of situation emulation more fluent and smooth; capable of record in-situ emulation data such that the whole process of virtual emulation training is playbacked, analyzed and evaluated.

Communication method between real-time operating system and non-real-time operating system on multi-core processor

The invention discloses a communication method between a real-time operating system and a non-real-time operating system on a multi-core processor. The method comprises the following steps that firstly, the length of information of each frame and the capacity of the shared memory are statically configured; secondly, the shared memory is divided into a buffer area for synchronous messages and a queue for asynchronous messages, a progress of processing the messages is established for the real-time operating system and the non-real-time operating system, and internuclear interruption is registered on the multi-core processor; thirdly, the operating systems are communicated, the operating system sending the messages stores the messages into the corresponding part in the shared memory, the internuclear interruption is triggered, the operating system receiving the messages responds to the internuclear interruption, the messages are copied from the shared memory, the feedback is sent to the operating system sending the messages, and communication is finished. According to the communication method, the communication mode adopted in the messages is set in advance, a unified mapping table is not needed, and the progress can be managed conveniently.

Event handling method and device based on time wheel timer

The invention relates to the field of communications and discloses an event handling method and device based on a time wheel timer. The event handing method and device are used for effectively reducing system overheads. The method includes the steps that each time event is listed into a time chain table corresponding to a current time component, with the lowest precision, contained in a corresponding time threshold value; circulated timing is carried out through a timer with the highest precision; every time the timer is overtime, whether overtime time chain tables exist or not will be judged, overtime time events recorded in an overtime time chain table will be popped up to be handled, each time chain table which is not overtime continues being listed in a time chain table corresponding a time component, of the next precision level, contained in a time threshold of the time chain table, monitoring continues being carried out through the timer, in this way, operation of a whole time wheel can be promoted just through one timer with the highest precision, the overtime conditions of each time event can be respectively monitored, and therefore system overheads are effectively reduced, and the capacity of a system corresponding to the time events is increased.

Device and method for synchronism update of map data on handhold GPS terminal device

The invention relates to a device and a method for synchronous updating of the map data in a handheld GPS terminal device. The device comprises a map database as well as a map data engine module and a synchronous module which are connected in turn, wherein, the synchronous module comprises a communication functional unit and an execution functional unit; the execution functional unit is connected with the map data engine module, while the communication functional unit is connected with the communication functional unit of an opposite terminal device through a data communication link. The method includes the following steps that: data communication connection is set up; a synchronous updating command is transmitted to an opposite terminal; the opposite terminal carries out command analysis; the map data engine module, which carries out map data searching and data extraction according to the type of the command, sends the results to the opposite terminal through the synchronous module, or completes map data insertion and reconstruction and updates system timestamp. The device and the method reduce system overhead and increase data exchange efficiency; moreover, user-defined data information is automatically protected from being covered by updated data according to requirements.

Downlink virtual MIMO-NOMA (Multiple Input Multiple Output-Non-Orthogonal Multiple Output) method based on power and rate joint optimization

ActiveCN110855335AReduce system overheadSave bandwidth and energyPower managementRadio transmissionMultiple inputInterference elimination
The invention discloses a downlink virtual MIMO-NOMA method based on power and rate joint optimization. The method comprises the following steps: firstly, enabling a terminal node to form a pluralityof virtual array antenna clusters through an ad hoc network protocol, and enabling each cluster to report path loss and channel statistical characteristics to a base station; then, a system average throughput maximization problem is constructed on a base station side, and an alternate iterative optimization algorithm is utilized to perform joint optimization of power and rate; next, the base station feeds back NOMA decoding sequence information to each cluster, and uses precoding and superposition coding technologies to perform power domain multiplexing on multiple data streams requested by each cluster; and finally, segmenting the data volume by utilizing zero-breaking detection, and decoding the expected signal by utilizing a continuous interference elimination technology. Compared withthe traditional OMA, NOMA and virtual MIMO technologies, the method has the advantages that the system capacity can be remarkably improved and the cluster fairness is ensured at a high signal-to-noiseratio.

Dynamic monitoring method applied to cloud platform

ActiveCN107483292AReduce monitoring frequencyReduce system overheadData switching networksSecurity assessmentSystem service
The invention relates to a dynamic monitoring method applied to a cloud platform. The dynamic monitoring method applied to the cloud platform comprises the following steps: A, collecting monitoring data of each monitoring node; B, performing security assessment on the monitoring data; C, dividing the security state into two kinds: continuous and discontinuous; D, building a security state change curve when the monitoring node of the continuous security state adjusts the monitoring frequency; E, calculating the slope of the curve; F, calculating the time for the next data acquisition of the monitoring node; G, segmenting the interval of the monitoring frequency when the monitoring node of discontinuous security state adjusts the monitoring frequency; H, calculating the difference between the last two security state values; and I, calculating the next data acquisition time according to the obtained difference and the time segments. By means of the dynamic monitoring method applied to the cloud platform, the monitoring frequency adjustment can be related to the change of the security state of the monitoring node, and the dynamic adjustment of monitoring frequency can be carried out accurately according to the change of the security state of the monitoring node, therefore, the security of the system is effectively guaranteed, and the impact of the monitoring on the system services is reduced.

Integral multiple frequency offset estimation method of OFDM (orthogonal frequency division multiplexing) system with residual time bias

The invention discloses an integral multiple frequency offset estimation method of an OFDM (orthogonal frequency division multiplexing) system with residual time bias, which solves the problems of low utilization rate of channel frequency spectrum and low accuracy in integral multiple frequency offset estimation in the prior art. The method specifically comprises the following steps of: (1) generating a training sequence according to performance requirement of the system, and storing the training sequence in a transmitting terminal and a receiving terminal; (2) performing fast Fourier transform on a received signal of which cyclic prefix is removed, thus obtaining a frequency domain signal of the received signal; (3) generating a cross-ambiguity function according to the receiving end frequency domain signal and a local training sequence; (4) forming a two-dimensional moment matrix according to Doppler slices of the cross-ambiguity function; and (5) traversing the two-dimensional moment matrix in the whole time delay and the frequency offset range to obtain an integral multiple frequency offset estimation value and a residual time bias estimation value. The method provided by the invention has the advantages of low system overhead, high accuracy in integral multiple frequency offset estimation and strong capability in resisting frequency-selective fading.
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