40results about How to "Improve transmission robustness" patented technology

In 802.11ax networks with access points, a trigger frame offers scheduled and random resource units to nodes for data uplink communication to the access points. To make more effective the usage of the network, the access point may design the trigger frame to force the nodes to send some categories of data. Resource units may be defined in trigger frames to be dedicated to small packets or to some access category data. Adjusting the time length of the resource units helps restricting the type of data that can be conveyed by the resource units. Also, using various frequency widths for resource units in the same trigger frame helps reducing padding in the resource units when various traffic types coexist.

A telemetry system including a first device having a processor that employs a DC balanced encoding scheme to generate a DC balanced encoded data signal, a modulator for modulating an RF carrier wave by the DC balanced encoded data signal and generating a DC balanced encoded RF modulated data signal including DC balanced RF energy. The DC balanced encoded RF modulated data signal transmitted by the first device is received by a second device. Since the RF energy received is DC balanced, drift in baseline voltage is eliminated irrespective of data transmission thereby improving the robustness of recovery of data by the second device. The second device may include a converter for converting the DC balanced RF energy extracted from the received DC balanced encoded RF modulated data signal to a substantially constant average induced voltage, irrespective of data being transmitted, for powering at least one component of the second device.

A method and system for transmitting uncompressed video over a wireless channel by inputting a frame of pixel information, partitioning spatially correlated pixels into different packets, and transmitting the packets separately over a wireless channel. For robust transmission, error detection data can be generated for each packet and appended to each packet before transmission. A receiver receives the transmitted packets and checks if a received packet is corrupt based on the appended error detection data. For a corrupt packet, the receiver corrects the corrupt pixels using pixel information in other received packets containing neighboring pixels to recover each corrupt pixel in the corrupt packet.

The invention discloses a transmission control method and a transmission control device of buffer state report (BSR), wherein the method and device are used for adjusting physical resources which transmit BSR to increase transmission chances of the BSR, so that the transmission success rate of the BSR is improved. The transmission control method of BSR comprises the steps of: distributing a physical uplink shared channel (PUSCH) resource for a terminal when a schedule requirement (SR) transmitted by the terminal is received, and sending a UL-GRANT which carries a PUSCH resource indication distributed for the terminal to the terminal; detecting a decoding result of BSR transmitted by the terminal via the PUSCH resource; judging whether the sending of the UL-GRANT is continued or not, and adjusting PUSCH resource positions distributed for the terminal.

A method and a system for bit reorganization and packetization of uncompressed video for transmission over wireless communication channels. The bit stream of the uncompressed video is reorganized according to importance levels of video bits. Then, various unequal protection methods such as encoding are applied to bits at different video importance levels. The reorganized and encoded information is then transmitted from a transmitter to a receiver over a wireless channel. The receiver performs the reverse steps of the transmitter, along with error detection / correction as needed, to recover the uncompressed video information.

An emergency manager for a lighting device (1), which lighting device is configured to transmit information by coding its output light. The emergency manager has a light coding unit (5), configured to code light emitted by a light emitter (3), thereby enabling the light emitter to emit a coded light signal including an individual identifier identifying the lighting device; an emergency indicator (7); and a control unit (9). The control unit is configured to control the light coding unit to adjust the coded light signal to increase a robustness of a transmission of the coded light signal upon receiving an emergency indication from the emergency indicator.

The invention provides a reconfigurable intelligent surface assisted multi-user MIMO uplink transmission method. According to the transmission method, a signal sent by a user side is reflected to a base station through an RIS, and the RIS can change the phase of the signal incident on the RIS. Aiming at a bottleneck problem of channel information acquisition of an RIS-assisted multi-user MIMO transmission system, only partial channel state information is utilized, including instantaneous channel state information from the RIS to a base station channel and statistical channel state informationfrom a user to the RIS channel; through an alternate optimization method, a deterministic equivalence principle, a block coordinate descent method, an MM method and the like, a sending covariance matrix and an RIS phase shift matrix of a user are jointly designed to maximize the global energy efficiency of the system or traverse the spectral efficiency; when the channel state information is changed, the user side dynamically implements transmission power distribution with maximum energy or spectral efficiency, and the RIS dynamically adjusts the phase shift matrix. According to the invention,the implementation complexity is low, and the performance of multi-user MIMO uplink transmission can be effectively improved.

An optical differentially phase shift keyed or DPSK binary signal which in the event of phase changes exhibits amplitude reductions and is phase-demodulated is provided. The received optical DPSK binary signal is additionally amplitude-demodulated and resulting phase and amplitude information is evaluated.

The invention discloses a method for controlling transmission errors of a multiview video based on a distributed coding technology. The method is used for reducing diffusion of the transmission errors among view points and in the view points, and protecting the quality of multiview video decoding reestablished images. The method comprises the following steps of: firstly, modeling transmission degree of distortion of each view point key frame of the multiview video; secondly, estimating the Wyner-Ziv (WZ) code rate of the transmission errors required to be corrected according to the degree of distortion of the key frames; and finally, performing error protection on adaptive selection WZ frames through a rate distortion cost. By the method, the diffusion of the transmission errors among the view points can be effectively reduced and the transmission robustness of multiview video streams is enhanced by increasing a small quantity of auxiliary code streams, so that the method can well adapt to video transmission in a lossy network environment.

Continuous phase frequency shift keying modulation is employed during wireless transmission from an internal device to an external device to increase robustness of transmissions. The continuous phase frequency shift keying processor receives as input an incoming data stream and includes a timer for toggling its output between a first predetermined frequency and a second predetermined frequency on a predetermined time period basis based on the logical state of each bit in the incoming data stream. For a portion of time while the counter or timer of the CPFSK processor is counting down the predetermined time period associated with the detected logic state of a particular bit of the incoming data signal at least some of the other circuitry, preferably all of the other circuitry of the processor, is toggled to a sleep mode in which power is cut off thereby minimizing power consumption by the processor during this interim state.

A method is provided for transmitting a multiple-carrier signal. The method includes modulating data symbols representative of a data signal to be transmitted, which includes a filtering by at least one prototype function using at least two different filtering coefficients, thus providing a modulated signal including a time sequence of multiple-carrier symbols. A hold interval is inserted in front of at least one multiple-carrier symbol of the modulated signal, thus providing the multiple-carrier signal.

The invention discloses a rate-distortion-optimized multi-view video transmission error control method based on a joint source channel, comprising: multi-view video coding, first performing motion parallax compensation prediction on a video sequence, and then performing coding mode selection; establishing an end-to-end video Distortion model, after the multi-view video sequence is predicted by motion parallax compensation, a virtual channel encoder is used to establish an end-to-end distortion model; the rate-distortion optimization coding of the joint source channel is based on the distortion model and virtual channel encoder. The generated channel parameter set and the error-corrected channel packet loss rate are used for rate-distortion optimization of the joint source channel. The obtained optimal source parameters are used for the selection of coding modes, and the obtained optimal channel parameters are used for channel coding. the encoding of the device. The method of the invention can effectively correct channel errors, reduce the spread of transmission errors among viewpoints, improve the transmission robustness of multi-view video streams, and make it better suited for video transmission in a lossy network environment.