31results about How to "Reliable wireless communication" patented technology

A polar-loop wireless communication apparatus includes, on a forward path between an amplitude detector and a power amplifier which constitute an amplitude control loop, a variable gain amplifier and a switch to change characteristics of a loop filter to output a frequency bandwidth of the amplitude control loop to an order less than an order for normal operation. The system is operated with the characteristics set to the lower order to measure outputs from the power amplifier to calibrate the output power of the power transmitter, and the register is operated with the characteristics set to the higher order to measure the open loop gain of the amplitude control. According to results of the calculation, data to correct gain characteristics of the variable gain amplifier with respect to an output control signal is stored in a nonvolatile memory of a baseband circuit.

A setting unit sets a specified time serving as a clear-to-send time, during which a two-way frame transmission is possible between a local wireless base station and a wireless terminal station accommodated in the wireless base station, and as a wireless-channel reservation time used for a frame transmission between the wireless base station and the wireless terminal station, and wireless terminal station specifying information for specifying a wireless terminal station to which the specified time is applied, in a transmission control frame. A transmitting unit transmits the transmission control frame to the wireless terminal station.

The invention discloses an emergency brake intelligent control method based on the Internet of Vehicles. The method comprises the steps that a vehicle acquires CAN bus information and sends an emergency brake message outwards when emergency brake occurs; another vehicle receives the emergency brake message, then judges the relevancy of traveling directions of the two vehicles and the front-back position relation between the two vehicles, and calculates the actual distance dis between the two vehicles and collision reaction distance RD if the two vehicles are related and the vehicle is located behind the vehicle sending the emergency message; if RD<dis<100 m, the another vehicle gives out a voice alarm to remind the driver to slow down; if dis<RD, the another vehicle is automatically controlled to brake and slow down to a safe speed. According to the method, efficient and reliable safety warning is guaranteed, energy consumption of vehicular units is reduced at low communication cost and computation overheads, and a simple and efficient emergency brake intelligent control method is provided for an auxiliary traveling safety mechanism of the Internet of Vehicles.

In a network for a safety system in a transportation system, the transportation system includes a shaft and a car arranged in the shaft. A first wall node is at a first end of the shaft and a second wall node is at a second end of the shaft to communicate safety messages with the car. Each wall node includes at least one wireless transceiver connected to one or more antennas. Each car in the shaft includes at least two wireless transceiver connected to one or more antennas, wherein the first transceiver of the car uses a first frequency and the second transceiver of the car uses a second frequency to communicate each safety messages in duplicate. A wired backbone connects the set of wall nodes to a controller of the safety system of the transportation system.

The present invention relates to a wireless communication node (20A) adapted to via feeder ports be connected to antenna ports. It comprises signal handling and estimating means (21A) adapted to collect signals from a mobile station and to generate a plurality of channel estimates, connection combination information holding means (22A) adapted to hold information about all possible feeder port-antenna port connections, processing means (24A) comprising channel modelling means (23A) adapted to provide a channel model for the received signals. If further comprises channel model fitting means (25A) adapted to compare the channel model with the channel estimates for a plurality of permutations obtained by the connection combination information and order identifying means (26A) adapted to identify the feeder port connection order corresponding to the permutation order giving the best fit between channel model and channel estimates, hence allowing identification of the order in which the feeder ports actually are connected to the antenna ports.

The invention relates to a trainable wireless control system (2) mounted to a vehicle (1) and to a vehicle (1) containing a trainable wireless control system (2), the trainable wireless control system (2) comprising a first module (3) and a second module (4), wherein the first module (3) comprises at least a user interface, wherein the second module (4) comprises at least a transceiver unit (41) and wherein the first module (3) is provided inside the interior of the vehicle (1) and the second module (4) is provided outside the interior of the vehicle (1), wherein the first and second module are connected by a means for transmitting electronic instructions, wherein the system is configured to wirelessly control a wirelessly controllable device external to the vehicle (1).

The invention relates to a cooperative frequency spectrum sensing method based on consistency in a cognitive radio electric network, which comprises the following steps: causing cognitive radio users to carry out frequency spectrum sensing measurement to a main radio user, establishing radio communication link alternating current frequency spectrum sensing measurement result information among all the cognitive radio users, judging whether the main radio user exists or not and carrying out subsequent frequency spectrum shared access operation according to judgment results. Reliable radio communication in the cooperative frequency spectrum sensing process is ensured by adopting the cooperative frequency spectrum sensing method based on the consistency in the cognitive radio electric network and utilizing a distributed model, so that not only can the cognitive radio users in the cognitive radio electric network can better effectively sense the frequency range use situations of an unauthorized user, but also can the cognitive radio users use more network resources on the premise of not influencing the authorized user, so that the probabilities of detection loss and early warning error are reduced, the utilization ratio of the network resources is improved, the working performance is stable and reliable, and the application scope is wider.

A medical device includes an antenna external to a case, package, or encapsulant for the electronic systems of the medical device. In one embodiment, a diabetes infusion pump is enclosed within a metal case, the pump including a processor and a communication module for wireless communications. An antenna is disposed in the delivery tubing of the pump outside the case with an antenna feed interconnecting the external antenna with the internal communication module. In another aspect, a thin film antenna is formed on the outer surface of the case in which a physiological parameter sensor, such as a glucose sensor, is enclosed. Multiple antennas may be used for communications on different frequencies.

The invention discloses a bidirectional radiating antenna used in mine shafts and tunnels, belonging to the field of antenna design in wireless communication. The bidirectional radiating antenna is characterized in that a rectangular metal frame is stimulated by a short metal post, wherein the metal frame works in a one-wavelength mode, two narrow sides of the metal frame are radiating main bodies, the distance between the two narrow sides is a little bit smaller than half wavelength, the radiating main bodies form an array and realize the bidirectional radiating with higher gain, the bidirectional radiating antenna can be matched better at a feed port by regulating the height and the diameter of the short metal bars, the long side length and the narrow side length of the metal frame and the width of the metal frame, and the bidirectional radiating property with higher gain is realized. The bidirectional radiating antenna has the advantages of being small in volume, small in windward area, low in cost, easy to process, high in gain and the like, is suitable for realizing wireless communication in the classical space-limited non-free space propagation channels, such as the mine shafts and the tunnels.

The invention provides a TWS earphone communication method and system based on carrier monitoring, and a TWS earphone. The TWS earphone comprises a master earphone and a slave earphone. After the master earphone and the slave earphone receive the data packet sent by the Bluetooth device, the master earphone and the slave earphone carry out carrier monitoring on the channel; when the channel is occupied, the master earphone and the slave earphone do not send signals; when the channel is idle and the slave earphone does not correctly receive the data packet, the slave earphone firstly sends a signal to preempt the channel and then communicates with the Bluetooth device, and the master earphone does not send the signal when detecting that the channel is occupied; and when the channel is idleand the slave earphone correctly receives the data packet, the slave earphone does not send a signal, and the master earphone sends the signal to preempt the channel and then communicates with the Bluetooth device. According to the TWS earphone communication method and system based on carrier monitoring, the TWS earphone, the master earphone and the slave earphone realize communication with the Bluetooth device in a mode of preempting a channel through carrier monitoring, and interaction between the master earphone and the slave earphone is not needed.

The invention discloses an intelligent image analysis system of a railway goods inspection robot. A robot erected beside a railway rail slides on a customized rail for routing inspection, and the appearance state and the cargo loading state of a freight boxcar are collected in real time, wherein the appearance state and the cargo loading state include the appearance damage, the physical deformation, the sealing state and the like, and the data is transmitted to a station intelligent analysis terminal through a station WIFI, a 5G technology or a wired transmission mode, so that the inspection content and an inspection result during the cargo inspection process are presented in real time. By combining the information, such as the cargo inspection professional inspection standard, the normalappearance state of the cargo boxcar, etc., through a rear-end image analysis software, and by means of a machine learning algorithm and the model comparison, the functions of automatic inspection, fault warning, early warning and the like of the appearance state and the cargo loading state of the cargo boxcar, are achieved.

A MIMO-OFDM system for increasing reliability includes a transmission terminal that includes N_t transmission antennas and transmits a MIMO signal through relay terminals, and a reception terminal that receives the MIMO signal from the relay terminal through N_r reception antennas, and the transmission terminal extracts a composite channel coefficient from a composite channel generated by matching a channel between the transmission terminal and the reception terminal with a channel between each of a plurality of the relay terminals and the reception terminal, selects the relay terminal corresponding to the composite channel coefficient having a maximized channel capacity from among the plurality of relay terminals by using the extracted composite channel coefficient, and transmits a MIMO signal to the reception terminal through the selected relay terminal.

The invention provides a communication method and a device, and a readable storage medium. The communication method comprises the following steps: establishing a communication connection with a data source device; establishing a second wired connection with other devices; exchanging respective identification information with the other device by the second wired connection, so that the other devicereceives the communication data sent by the data source device according to the received identification information. With the above scheme, multi-device communication can be performed quickly and reliably.

The invention provides a self-assembly aircraft control device. Aircraft and remote control device, the aircraft comprises a battery, a first electronic speed regulator, a second electronic speed regulator, a third electronic speed regulator, a fourth electronic speed regulator, a first motor, a second motor, a third motor, a fourth motor, an aircraft control panel and an aircraft wireless receiving device. The first electronic speed regulator, the second electronic speed regulator, the third electronic speed regulator and the fourth electronic speed regulator are in one-to-one correspondenceconnection with the first motor, the second motor, the third motor and the fourth motor; the aircraft is reasonable in design, convenient to use, stable in control and reliable in wireless communication, the brushless motor is adopted in the aircraft, the difference between the aircraft and a brush motor is that the brushless motor has the advantages of being large in power, high in endurance andthe like, a rechargeable lithium battery is adopted as the battery, and the lithium battery has the advantages of being light in weight, high in electric power storage, high in efficiency and the like.