1150results about "Propogation channels monitoring" patented technology

The invention provides a channel detection notification method, a channel detection notification system and base stations used when an LTE system works at an unauthorized frequency band. The channel detection notification method includes the steps that the primary cell base station receives RRM measuring results, reported by a terminal, of multiple base stations at the unauthorized frequency band; according to the RRM measuring results of the base stations, the secondary cell base station is selected for the terminal; if it is determined that downlink traffic reaches a set first traffic threshold value, the secondary cell base station is informed to conduct downlink channel detection; if it is determined that uplink traffic reaches a set second traffic threshold value, the secondary cell base station and/or the terminal are/is informed to conduct uplink channel detection. According to the channel detection notification method, channel detection work conducted when the LTE system works at the unauthorized frequency band is managed by the primary cell base station in a united mode, the time delay generated when the secondary cell base station and/or the terminal carry/carries out channel detection can be effectively shortened, accuracy at which channel detection time is judged can be improved, and the resource utilization rate is increased when the LTE system works at the unauthorized frequency band.

Systems, methods and apparatus for automatic signal detection with temporal feature extraction in an RF environment are disclosed. An apparatus learns the RF environment in a predetermined period based on statistical learning techniques, thereby creating learning data. A knowledge map is formed based on the learning data. The apparatus automatically extracts temporal features of the RF environment from the knowledge map. A real-time spectral sweep is scrubbed against the knowledge map. The apparatus is operable to detect a signal in the RF environment, which has a low power level or is a narrowband signal buried in a wideband signal, and which cannot be identified otherwise.

The invention provides an unmanned aerial vehicle signal processing device and a processing method thereof. The device comprises a receiving module (1), a monitoring module (2), an early warning module (3), an interference module (4) and a transmitting module (5). The early warning module (3) comprises a storage unit (10) which stores unmanned aerial vehicle frequency domain data and a comparison unit (11) which compares current frequency domain data transmitted by a frequency spectrum analysis unit (9) with the unmanned aerial vehicle frequency domain data stored in the storage unit (10). The early warning module (3) alarms when the comparison result is in the preset range. The interference module (4) comprises a baseband signal generator (12) which sets baseband signal frequency, an interference modulator (13) which modulates a baseband signal into a noise signal, a working amplifier (14) which increases noise power and a combiner (15) which combines different noise frequency bands. Close-up flight of an unmanned aerial vehicle can be warned in advance by detecting working frequency range of the unmanned aerial vehicle, and close-up flight of the unmanned aerial vehicle to the protected security area can be prevented.

The invention provides a dynamic spectrum access method on the basis that the policy planning restricts Q learning, which comprises the following steps: cognitive users can divide the frequency spectrum state space, and select out the reasonable and legal state space; the state space can be ranked and modularized; each ranked module can finish the Q form initialization operation before finishing the Q learning; each module can individually execute the Q learning algorithm; the algorithm can be selected according to the learning rule and actions; the actions finally adopted by the cognitive users can be obtained by making the strategic decisions by comprehensively considering all the learning modules; whether the selected access frequency spectrum is in conflict with the authorized users is determined; if so, the collision probability is worked out; otherwise, the next step is executed; whether an environmental policy planning knowledge base is changed is determined; if so, the environmental policy planning knowledge base is updated, and the learning Q value is adjusted; the above part steps are repeatedly executed till the learning convergence. The method can improve the whole system performance, and overcome the learning blindness of the intelligent body, enhance the learning efficiency, and speed up the convergence speed.

The present invention relates to wireless networks and more specifically to systems and methods for selecting available channels free of radar signals from a plurality of 5 GHz radio frequency channels. In one embodiment, the present invention provides a standalone multi-channel DFS master that includes a switch and embedded processor that are programmed to switch a 5 GHz radio transceiver to a first channel of the plurality of 5 GHz radio channels, cause a beacon generator to generate a beacon in the first channel of the plurality of 5 GHz radio channels, cause a radar detector to scan for the radar signal in the first channel of the plurality of 5 GHz radio channel, and then repeat these steps for each of the other channels of the plurality of 5 GHz radio channels during a single beacon transmission duty cycle.

The invention provides a wireless field intensity breath detecting method and device and a breath detector. Channel state information CSI is extracted from existing 802.11WiFi wireless signals and is utilized for acquiring the weak changes, caused by breath during sleep of people, of the wireless signals, and therefore the aim of tracking and detecting the human body breath condition is achieved. By means of a CSI extracting step, a data correction step and a breath rate detecting step, an existing 802.11a/g/n WiFi network and a mobile terminal are utilized, no professional wearable sensor is needed, the wireless field intensity breath detector is customized, besides, the device can be installed in a mobile terminal of a user as software, and detection can be achieved by upgrading existing wearable equipment. Therefore, the device can be popularized to home environments in a large scale, serves as an applied product for people to carry out long-term human body health monitoring every day and has very high application and business value.

The invention provides an on-site level radio testing system and a method thereof for the network debugging application of underwater sound sensors, which relate to the field of system tests. A backbone network of the testing system is built on the basis of a radio-frequency radio communication mode and comprises a trunk node (1) which simultaneously supports radio-frequency communication and wired communication, a convergent node (2) and a system administrative center (3) which simultaneously support the radio-frequency communication and the wired communication, and the trunk node (1) provides a wired communication interface for the communication of underwater sound communication testing nodes. The method comprises a uniform transmission mode of automatic framing data packets in different transmission agent, and a TDMA-based two-way transmission method of water surface radio-frequency radio communication. The method can be widely applied to tests in aspects, such as the study of algorism for processing signals of underwater communication systems and the study of the network communication protocol of underwater sound sensors.

The embodiment of the invention discloses a method for detecting an unauthorized frequency spectrum channel. The method comprises the steps as follows: monitoring channel condition of the unauthorized frequency spectrum channel in a monitoring time period, wherein the period for monitoring is a first period; adjusting the period for monitoring to be a second period while monitoring that the unauthorized frequency spectrum channel is in busy state in the continuous N first periods, wherein the first period is longer than the second period, and N is not less than 2 and is an integer. The embodiment of the invention further discloses a detecting device, related equipment and a system. The method of the invention could improve the fairness of accessing the unauthorized frequency spectrum channel and reduce the time delay of data transmission.

The present disclosure provides a channel monitoring method and apparatus. The channel monitoring method is applied to a base station, and includes the steps: configuring, for the terminal, a first discontinuous reception DRX parameter for channel monitoring; determining a first power saving signal for indicating the first DRX parameter; and sending the first power saving signal to the terminal, so as to enable the terminal to determine the corresponding first DRX parameter according to the first power saving signal and perform corresponding channel monitoring according to the DRX parameter. Therefore, the channel monitoring method not only realizes the use of the power saving signal to quickly realize the dynamic configuration of the DRX parameter, but also improves the efficiency of channel monitoring.

One embodiment of the present description provides a method for monitoring a physical downlink control channel (PDCCH). The method for monitoring a PDCCH can comprise the steps of: performing a frequency division duplex (FDD) half-duplex operation; and determining whether to monitor the PDCCH if discontinuous reception (DRX) is set. Here, when a downlink subframe of a downlink carrier is positioned immediately before an uplink subframe of an uplink carrier, the PDCCH can be monitored in the downlink subframe during an active time.

The invention discloses an expressway vehicle sensing system and method based on space channel detection. An unmanned aerial vehicle space channel detection method is used, and expressway multilane and multi-vehicle real-time scanning detection is performed through a receiving and transmitting antenna array arranged at the bottom of an unmanned aerial vehicle detector. According to the analysis on the variation characteristics on a space moving channel, multi-dimensional parameters of the moving channel can be obtained in real time, and the position, the speed and the vehicle type of moving vehicles on an expressway are accurately estimated. The expressway vehicle sensing system and method based on space channel detection break through the limitation of vehicle sensing based on traditional sensors such as an infrared sensor and a video sensor, an advanced space moving channel detection and vehicle sensing technology is utilized, the all-weather vehicle sensing capacity in the intelligent transportation system application is improved, and the expressway rod vehicle sensing system and method based on space channel detection can be applied to the fields of intelligent transportation system air control, expressway traffic dispersion, after-calamity traffic guidance control, military exercise air monitoring and the like.

A wireless RF data transmission system has at least one base station transmitting control information on a control channel and high speed data on at least one data channel. At least one subscriber station receives the control information and data channels, adjusting a modulation and/or coding of reception of the data in response to the control information. Preferably, the control information is transmitted using a more robust modulation, such as QPSK, than used to transmit the data, which is preferably transmitted using either 16, 64 or 256 QAM. Additionally, timing or header information for the data may be included on the control channel.

This invention discloses a method for testing phase difference and relative amplitude of input signals in single channels, which generates modulation signals by a control frequency splitter then to modulate the input signals to merge them to mono-channel transmission, then the merged signals are transformed, sampled, window- added and FFT to get information of phase difference, amplitude and relative amplitude.

The invention discloses a radio frequency channel parallel detecting device and method for an unmanned aerial vehicle. The device comprises a number of radio frequency modules, a number of radio frequency microcomputer modules, a general control microcomputer module and a real time clock module. The device divides the common 2.4GHz communication band of the unmanned aerial vehicle into 42 channels, and then measures the RSSI and time of each channel in parallel. According to the measurement result, the difference between an unmanned aerial vehicle signal and the RSSI of the background noise and the bandwidth characteristic of the unmanned aerial vehicle signal are used to detect the unmanned aerial vehicle, wherein the unmanned aerial vehicle signal mainly comprises an image transmission signal and a remote control signal. In addition, the device can detect the frequency hopping sequence of the remote control signal of the unmanned aerial vehicle, and further identifies the unmanned aerial vehicle model according to the frequency hopping sequence. The radio frequency channel parallel detecting device and method for the unmanned aerial vehicle have the advantages of low cost, high detection precision, simple and convenient deployment of the device structure and the like, can effectively detect and identify the unmanned aerial vehicle, and can be widely used and deployed in various areas where unmanned aerial vehicle detection is needed.

The invention discloses a device and method for supporting the parallel simulation and the physical simulation of a wireless sensor network. The device comprises a plurality of sensor nodes, a simulation decluster sensor network, a parallel event scheduler and a data processing platform, wherein the multiple sensor nodes are used to transmit working parameters, map the working parameters into virtual nodes, realize online debugging and integrate to the simulation decluster sensor network; the simulation decluster sensor network is used to establish a model, support the network management, integrate a wireless sensor network which can simulate specific applications in simulation, support online software debugging of the sensor nodes and support actual performance analysis of a simulation actual sensor network; the parallel event scheduler is connected with the communication of the simulation decluster sensor network and is used to complete multithreaded programming, execute the simulation events in parallel and maintain a global event queue; and the data processing platform is in communicating junction with the simulation decluster sensor network and is used to receive, store, analyze and display data. By the device, the wireless sensor network performance and node debugging information in different modeling complexities can be accurately described.

The disclosed system includes network central station in locomotive, and network junction station in each carriage. Both of the said network central station and network junction station is as front end, back end, data acquisition and execution unit and power section of equipment including digital signal processor and free space optical communication portion (FSO) of the forwarding and device control center. FSO includes optical transceivers A and B. In charge of carrying out continuous monitoring in real time for state of locomotive and carriages, data acquisition part in the data acquisition and execution unit includes wind pressure sensor, thermal axis sensor, bearing sensor, derailment detector, digital camera etc. The execution unit controls a banking locomotive to act operations accordant with main locomotive. The execution unit for carriage controls braking and releasing electropneumatic valve.

The invention discloses a high-precision wireless channel test bench based on a virtual antenna array and a method thereof. An antenna system adopts the virtual antenna array technology based on an electronic control wave beam scanning antenna, adjusts the wave beam direction of the antenna wave beam in a horizontal zone and a vertical zone by a voltage control signal, adjusts the physical position of the antenna by a rotation controller, measures the airspace in a scanning mode, collects actual-measurement channel response and obtains the fine grain characteristic of the channel in the time domain and the airspace so as to provide effective parameter for practical channel analysis and modeling. The invention improves the switching speed of the antenna array and increases the accuracy of channel test.

The invention discloses an intelligent detecting system, which comprises at least one information collector, at least one multifunction base, and a detecting server, which can reduce the cost of detecting system most, improve detection flexibility, realize multi-target detection, meet different user and condition demands, improve system reliability and safety or the like. The inventive intelligent detecting system has wide application and market outlet.

A processing module for a receiver device. The processor module comprises a channel estimate generation component arranged to output channel estimate information for a received signal, and a timestamping module arranged to determine a ToA measurement for a marker within a packet of the received signal based at least partly on the channel estimate information for the received signal generated by the channel estimate generation component. The channel estimate generation component comprises a validation component arranged to derive a validation pattern for the packet within the received signal for which a ToA measurement is to be determined, identify a section of the packet containing a validation sequence, and perform cross-correlation between at least a part of the validation sequence within the packet and at least a part of the validation pattern to generate channel estimate validation information.

The invention relates to a channel information transmission method, a data transmission method and equipment so as to improve the feedback accuracy of a pre-coding matrix. The first equipment comprises a receiving module, a processing module and a transmitting module, wherein the receiving module is used for receiving a reference signal; the processing module is used for measuring the reference signal to obtain first channel information and second channel information; the transmitting module is used for transmitting the first channel information and the second channel information; the first channel information comprises identification information of M first vectors, and M is an integer which is not less than 2; the second channel information comprises information of a weighted combination factor used for performing weighted combination on N first vectors in the M first vectors, and N is a positive integer which is not greater than M; and the first channel information and the second channel information are used for forming a pre-coding matrix. The second equipment can perform weighted combination on the M first vectors according to the weighed combination factor indicated by the second channel information when generating a pre-coding matrix, rather than only select a feature vector from a plurality of feature vectors, so that the generated pre-coding matrix is more accurate.

The invention discloses a data transmission test method based on a time division multiple access spatial dynamic network. The technical proposal of the invention is characterized by establishing a test environment which is composed of a network data semi-object test device and a measured satellite, performing test configuration and task planning to a test scene with the network data semi-object test device to judge whether the measured satellite is in orbit, calculating orbital data of a virtually directive star if the measured satellite is in orbit, otherwise, directly generating testing data, and distributing the data to each software of the network data semi-object test device; determining a goal node connected with each time slot with chain establishing directive software of the measured satellite, and calculating a link directivity; finally evaluating testing performance of the data transmission of the measured satellite. The test method of the invention can be used for finishing network protocol testing of the time division multiple access spatial dynamic network at ground test stage and satellite on-orbit stage on one set of hardware equipment under the premise that the satellite does not need to change self state.

A seamless collecting and real-time frequency spectrum monitoring implementation method based on an FPGA includes the steps of conducting filtering and A/D sampling on intermediate-frequency data through a band-pass anti-alias filter, transmitting low-voltage differential signals to the FPGA, arranging an accurate timestamp on the intermediate-frequency data through the FPGA according to second pulses provided by a GPS and according to a 125 MHz clock, converting the intermediate-frequency data into two paths of orthorhombic I/Q signals after digital down-conversion, and obtaining bandwidth-variable and sampling-rate-variable I/Q data after the I/Q data are extracted and filtered through a low-pass decimation filter. The finally-obtained I/Q data and frequency spectrum data need to be transmitted to a remote server by means of an embedded CPU through a network so as to be subsequently processed and analyzed and are limited by the uncertainty of the reading speed of the CPU and the transmission speed of the network, and caching is conducted through a third-generation double-data-rate synchronous dynamic random access memory.

Energy, data and information is obtained about the state of the electromagnetic spectrum and the nature of terrestrial transmissions through the use of a remote spectrum sensing system. The disclosure comprises at least one satellite in orbit around Earth capable of sensing frequencies in use by terrestrial transmitters such as those used for radiocommunication or radiodetermination services. In addition, various processing functions are applied to the collected energy, data and information before and/or after they are relayed to at least one ground station in order to reveal a greater understanding of the state of the spectrum and nature of transmissions. The disclosure relates to the described system in multiple embodiments and the method for obtaining energy, data and information about terrestrially used spectrum with such a system.