33 results about "Wireless telegraphy" patented technology

An industrial field real-time working condition radio alarm system, comprises a transmitting end (11) and a receiving end (12) carried a worker; the transmitting end (11) comprises a detector (101) to detect the current working condition, a transmitting end processor (102) to process an on-off signal sent by the detector (101), and a radio transmitter (103) to transmit an alarm signal to the receiving end (12) under the control of the transmitting end processor (102); the receiving end (12) comprises a radio receiver (105) to receive the alarm signal, a receiving end processor (106) to process the alarm signal sent by the radio receiver (105), and an alarm (107) to send an alarm under the control of the receiving end processor (106); the transmitting end processor (102) is connected to the detector (101) and the radio transmitter (103) respectively; and the receiving end processor (106) is connected to the radio receiver (105) and the alarm (107) respectively. The radio alarm system can send a dangerous working condition alarm to all workers in real time.

A method and an apparatus are provided for scrambling sequence initialization for downlink demodulation reference signal (DL DMRS) applied to the multi-user (MU) multi-input multi-output (MU-MIMO) in a coordinated multiple point (CoMP) scenario. The value of virtual slot index in the sequence initialization of the DL DMRS can be dynamically selected from two candidates and tied to the virtual cell ID and / or the physical downlink shared channel (PDSCH) scrambling ID. The two candidate values can be configured by a user equipment (UE) specific semi-statistical higher layer signaling if a subframe shifting is considered for enhanced inter-cell interference cancellation (eICIC) in HeNets. Possible values of virtual slot index used for generating the DL DMRS sequence initialization of the cell can then be derived so that access procedure information, which may include synchronization signal, physical broadcast channel, paging message, can be reliably received at the remote radio header (RRH) or pico cell.

An anti-theft system for a vehicle includes an on-vehicle machine including reporting means configured to report by radio an illegal activity affecting the vehicle to a designated opponent to be reported to in a case where the illegal activity is detected; and an external facility, the external facility including obstruction radio wave detection means configured to detect a radio wave obstructing the radio-report by the reporting means; and illegal activity prevention means configured to prevent the illegal activity in a case where the radio wave is detected by the obstruction radio wave detection means.

The invention relates to an infrared vehicle anti-theft alarm device, which is formed by infrared signal sending receiving device, burglar alarm system control box, sound alarm, and tear gas, wherein the infrared signal sending receiving device is connected to the burglar alarm system control box, sound alarm and tear gas; when using, turning on the switch of burglar alarm system control box after parking the vehicle, the infrared ranging device will work in seconds and transmit measured data to the alarm circuit of burglar alarm system control box; at that time, if the door is opened, the ranging signal will change to turn on the alarm circuit and close the start circuit of engine, to send wireless alarm to the mobile phone of user and release tear gas. The invention has simple structure and easy application.

A mobile communication device comprises an internal antenna device for receiving low-band signals of operating frequency band below 1 GHz, and the internal antenna device can be connected in series or parallel with an external antenna such as an earphone. The mobile communication device of the invention uses the internal antenna device for receiving low-band signals, enabling radio alarm function and timed recording of radio programs without plugging in an external earphone.

The invention relates to a radio control system for machine control, comprising: - a machine-side radio receiver (7), which is assigned its own identification mark, - assigned to the radio receiver (7), However, a mobile data carrier (9) which can be transported separately from this radio receiver and which contains information about the identification of the radio receiver (7) as stored data - is used to generate a radio telegram and transmit it to The radio transmitter (1) of the radio receiver (7), wherein the radio transmitter (1) is also assigned its own identification mark, wherein the radio transmitter (1) has an interface for transmitting data, the mobile data carrier (9) A data transmission connection can be entered into with this interface, and information about the identification mark of the radio receiver (7) can be transmitted from the mobile data carrier (9) into the radio transmitter (1) via this interface, wherein the radio The transmitter (1) is additionally configured to generate and store identification data from this information about the identification mark of the radio receiver (7), wherein the radio transmitter (1) is additionally configured to include the identification data in its radiotelegram , wherein the radio receiver (7) can be initialized in such a way that it accepts radio telegrams for machine control, if these radio telegrams contain relevant identification data within the radio telegrams.

In a radio alarm signaling system with a central station (Z) and a plurality of bidirectional (BT1 to BT5) and unidirectional (UT1, UT2) subscribers, the unidirectional subscribers (UT1, UT2) attempt to send messages via one of the bidirectional subscribers (BT1 to BT5) to the central station. In this case the message sent by a unidirectional subscriber (UT2) is received by all bidirectional subscribers (BT1, BT2, BT5) in its radio coverage area. Each bidirectional subscriber that has received this message waits until a time slot individually assigned to it before forwarding the message. During the wait time each of these bidirectional subscribers (BT1, BT2, BT5) monitors the radio channel to see whether another subscriber has already forwarded the message. If this is the case it suppresses its own forwarding. This ensures that only one of the bidirectional subscribers (BT1) forwards the message so that no overloading of the radio system occurs.

The invention relates to a method for radio transmission of data, in particular sensor data, between at least one, preferably permanently stationary, battery-operated node (2) and a base station (3) in a communication system (1) operating with bidirectional radio transmission, the base station (3) having a communication module (10) with a first frequency generator (11), the node (2) has a communication module (17) with a first frequency generator (18) and a second frequency generator (21), which has a lower frequency than the frequency of the first frequency generator (18), the communication module (17) of the node (2) being configured to transmit data in the uplink to the communication module (10) of the base station (3), the radio telegrams (40) are divided into at least two data packets, preferably into a plurality of data packets (40-1, 40-n), the individual data packets (40-1, 40-n) are transmitted one after the other at time intervals, and wherein the communication module (10) of the base station (3) is designed to transmit data in the downlink to the communication module (17) of the node (2), and wherein the communication module (17) of the base station (3) is designed to transmit data in the downlink to the communication module (17) of the node (2). The radio telegrams (50) are divided into at least two data packets, preferably into a plurality of data packets (50-1, 50-n), and the individual data packets (50-1, 50-n) are transmitted one after the other at time intervals. In order to solve the problem of improving the reception quality in the downlink, according to the invention, during a transmission time period consisting of a sequence of data packets (40-1, 40-n) and a subsequent sequence of data packets (50-1, 50-n) together with the sum of the time periods that may be located therebetween, the sequence of data packets (40-1, 40-n) and the subsequent sequence of data packets (50-1, 50-n) are transmitted to the downlink. At least two calibrations (KAL1) of the first frequency generator (18) and the second frequency generator (21) of the node (2) are made.