31results about How to "Robust transmission" patented technology

A radio transmission telemetry system includes several transmitters intermittently transmitting short messages indicative associated sensors status and a receiver for collecting data from the sensors. Each transmitter changes time and frequency of transmissions according to a time-frequency pattern that is different for each transmitter. The receiver identifies each source of transmissions based on its unique variations of the transmission time and frequency, thus eliminating the necessity to include the transmitter ID code in each transmitted message. Thus, overhead in the transmissions is reduced. In addition, the sensor status and other supervisory information such as battery status are partitioned and included in the transmitted messages in portions and at different rates according to the state of the PN-generator for producing the time-frequency pattern. The receiver can determine what and when is included without additional control bits in the transmitted messages. Thus, overhead in the transmissions is further reduced.

A method and system for robust delimiting of transmitted messages in switched-carrier operation in which a preamble precedes each communication message with the preamble comprising symbols transmitted at a rate lower than that of the following data. The lower rate symbols of the preamble significantly increase the probability that the decoder will decode the preamble symbols error free. Communication line control information can be included in the robust preamble, thereby ensuring that line control information is reliably transferred over the communication channel. The first symbol of the preamble can be transmitted at the lower symbol rate and at an increased power level, thereby clearly and reliably delimiting the beginning of a transmission. The end of the communication message can be reliably delimited by sending the first symbol containing only bits from a next cell of information at a lower symbol rate and including an extra bit in that symbol. The extra bit can be set to indicate to a receiver whether the last cell of information has just begun.

A wireless device (150) and related method of monitoring or controlling a process includes a housing (200) having a mounting structure (300) for rigidly connecting the wireless device with respect to a solid surface, such as within a processing facility (125). An antenna assembly (250) has a movable connection (e.g., using set screw 310 and channel 425) with the housing (200), wherein the antenna assembly can be moved with respect to the housing (200), and wherein the movable connection maintains a hermetic seal and an explosion-proof flame path of the housing and the antenna assembly. The wireless device (150) can include a transmitter, receiver or a transceiver coupled to the antenna assembly (250), wherein the wireless device (150) is operable to wirelessly transmit using the antenna assembly to a remote receiver or receive information from a remotely located transmitter.

A bicycle device with an internal drivetrain that eliminates any external mechanical drivetrain components. An internal drive gear is driven by user pedal input, which provides torque and rotation to a plurality of gear rods, connecting rods and disk gears. Gear ratio and speed choice is controlled by the drive gear and a first disk gear, which incorporate a variable gear pitch moving radially outward for which to mate with the gear rods. The drivetrain terminates at a hubless rear wheel, which rotates a tire tread around a stationary hub. Controls for the bicycle are provided in a handle bar stem device that manipulate the position of the gear rods and brake calipers. The front and rear wheel are separable from the central frame of the device for storage and transport. Overall, the present invention provides a sleek, modern upgrade to the traditional bicycle device, and incorporates several features that improve its design.

A method of operating a plurality of driving units for powering electronic units comprises interchanging a data frame including a bit sequence, between a master control unit and at least one of a plurality of driving units at slave nodes. A step of applying an ID field comprises indicating the driving unit address using a first bit sub-string comprising N bits, allowing the master control unit to identify whether data should be received or transmitted, or allowing each addressed driving unit to decode which action is required by the master control unit, using an R / T command bit, performing a length decoding step, for including information in the ID field regarding the type of instructions included in the data frame, using an F function bit, and assigning data bits to different electronic units or indicating in the length of the bit string in the data field, using a second bit sub-string.

A method in a network node for selecting a transmission mode to a wireless device in a wireless communication network is provided. The wireless communication network includes a first cell and a second cell. The wireless device is adapted to connect to a first cell, the network node serving the first cell. A network node obtains (301) information on respective downlink signal strengths from a first cell to said wireless device and from a second cell to said wireless device. The network node selects (302) a transmission mode for the wireless device based on the absolute signal strength and the difference in signal strength between the first cell and the second cell. A difference in signal strength between the first cell and the second cell is calculated based on the obtained information.

The invention discloses a precoding MIMO-OOFDM-VLC (Multiple-input Multiple-output-Optical Frequency Division Multiplexing-Visible Light Communication) imaging communication method based on PDS (Photodetector Selection). In the method, imaging reception and a receiving antenna selection technology are combined, and the VLC channel relevance among PDs (Photodetectors) of a same user terminal or different user terminals can be lowered remarkably, so that a stable high-performance gain is obtained for a multi-user system in a typical indoor environment; a more robust transmission link is formed for a plurality of users in the typical indoor environment; and the link bit error rate performance of a communication system is improved effectively.

A method for transmitting data in a telecommunication network having a satellite component and a terrestrial component, the data being organized into a set of packets having an identifier, the telecommunication network comprising at least one bearer, at least one satellite and at least one terrestrial station, the method comprises the steps of: transmission of a data packet having an identifier from said satellite, reception of the data packet by the bearer, transmission of a data packet having an identifier in response to a transmitted negative acknowledgement message by the terrestrial station. A method for receiving data to be implemented on a bearer, a method for transmitting data to be implemented on a terrestrial station, and an associated data transmission system are also provided.

The invention relates to a base station (100) comprising: a transceiver (101) for multi-carrier radio transmission within a radio frequency band, said transceiver (101) being adapted to receive multiple a user's quality of service request (102); and a radio resource controller (103) for allocating subcarriers for said multi-carrier radio transmission to said user, and according to said service of said user A quality request configures the subcarriers in the radio frequency band.

The invention relates to methods for adaptive clock reconstruction and decoding in audio frequency. The method includes the steps of: receiving a modulated signal, wherein the modulated signal is modulated by RC-FSK (Return to Carrier Frequency Shifting Keying); performing a spectrum analysis to the modulated signal to obtain a plurality of frequency envelopes; storing the frequency envelopes; searching the peak values of the frequency envelopes and the time points corresponding to the peak values to modify an estimated period; and generating a clock period for the RC-FSK demodulation and a clock phase for the RC-FSK demodulation according to the estimated period.