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

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.

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.

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.

The invention discloses a multi-view video transmission error control method for rate distortion optimization dynamic regulation. The method comprises the following steps of: estimating end-to-end distortion of a key frame and a non-key frame in a KS-IPP coding framework for predicting views in the key frame by using different estimation methods, wherein the end-to-end distortion of the key frame is estimated by a distortion method combined by channel simulation and rapid estimation; and the end-to-end distortion of the non-key frame is estimated by using a conventional recurrence-based distortion estimation method; combining the estimated end-to-end distortion and rate distortion optimization technology; and realizing the dynamic regulation of the rate distortion optimization through the dynamic change of the end-to-end distortion and the dynamic regulation of Lagrangian multiplier. The method has the advantages of effectively reducing the dispersion of the transmission error among the views, enhancing the transmission robustness of the multi-view video stream and thus adapting to the video transmission under lossy network environment well.

The invention provides a method and apparatus for eliminating amplitude limiting noise of an Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (ACO-OFDM) system. The method includes the steps of: carrying out modulation on input data sequences and obtaining time domain sequences of positive real numbers; carrying out threshold judgment on the time domain sequences of the positive real numbers so as to carry out amplitude limit on the part exceeding a predetermined threshold; obtaining transmitting signals; receiving the transmitting signals and obtaining the time domain signals; transforming the time domain signals and obtaining frequency domain observation sequences; obtaining frequency domain estimation sequences and noise estimation sequences; obtaining observation vectors and observation matrixes of a compressive sensing algorithm from a selection matrix; adopting the compressive sensing algorithm according to a compressive sensing algorithm mode, and obtaining the amplitude limiting noise sequences; and subtracting the amplitude limiting noise sequences from the time domain signals and obtaining the signals after the amplitude limiting noise signals are eliminated. In complex multipath channels having bad amplitude limit noises, the method can accurately and rapidly estimate and eliminate the amplitude limiting noises in high frequency spectrum efficiency, and can improve the system transmission robustness.

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.

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.

The invention discloses a multi-view video transmission error control method based on rate distortion optimization of a joint information source channel, which comprises the following steps: multi-viewpoint video coding: firstly performing motion parallax compensation prediction on a video sequence, and then performing coding mode selection; establishing an end-to-end distortion degree model, andestablishing the end-to-end distortion degree model by adopting a virtual channel encoder after motion parallax compensation prediction is carried out on the multi-viewpoint video sequence; and rate distortion optimization coding of the joint information source channel: carrying out rate distortion optimization of the joint information source channel according to the distortion model, the channelparameter set generated by the virtual channel coder and the corrected channel packet loss rate, wherein the obtained optimal information source parameter is used for selection of a coding mode, and the obtained optimal channel parameter is used for coding of the channel coder. According to the method, channel errors can be effectively corrected, diffusion of transmission errors among viewpoints is reduced, the transmission robustness of multi-view video streams is improved, and the multi-view video streams can better 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.

The invention provides an impulse noise eliminating method and device. The method comprises that S1) T transmitting antennas of an antenna system transmit frame headers and frame bodies of signal frames; S2) each reception antenna obtains the value of a reserved subcarrier in the frequency domain of the frame body to form the frequency-domain observation vector of impulse noise signals, and according to a multidimensional impulse noise combined sampling matrix composed of R frequency-domain observation vectors, a structural compressive sensing model is obtained; S3) estimation of time-domain impulse noise signals corresponding to the R reception antennas is obtained by utilizing the structural compressive sensing algorithm; and S4) the estimation of the time-domain impulse noise signals is subtracted from the corresponding time domain signals of the frame bodies of the R reception antennas to obtain frame body data of the signal frames of the R reception antennas of which impulse noise signals are eliminated. Thus, MIMO-OFDM impulse noises can be accurately estimated, and the spectral efficiency and robustness of the system are effectively improved.

The invention provides a large-scale MIMO uplink statistical transmission method assisted by a dynamic metasurface antenna. The dynamic metasurface antenna works at a base station side as a receiving antenna for uplink transmission, so that the transmission power consumption can be reduced, and the transmission performance is improved. In order to solve the problem that channel information of a current large-scale MIMO wireless transmission system is difficult to obtain, the invention proposes to optimize dynamic metasurface antenna assisted large-scale MIMO uplink transmission by using statistical channel state information, and the algorithm framework comprises methods of alternate optimization, certainty equivalence, Dinkelbach transformation and the like. According to the invention, large-scale MIMO uplink high-efficiency transmission assisted by the dynamic metasurface antenna based on statistical channel state information is realized with low complexity.

The invention provides a TCI state configuration method and device for an energy-saving signal, and belongs to the technical field of wireless communication. The TCI state configuration method of theenergy-saving signal is applied to network side equipment and comprises any one of the following steps that TCI state configuration information of a control resource set is sent to a terminal, the control resource set is associated with the energy-saving signal of the terminal and/or associated with a search space of the energy-saving signal, and the TCI state configuration information comprises at least one TCI state; and a corresponding relationship between an energy-saving signal detection opportunity and/or a search space detection opportunity of the energy-saving signal and a synchronization signal/physical broadcast channel block SS/PBCH block is pre-defined through high-level signaling configuration and/or a protocol. Through the technical scheme of the invention, the energy-savingsignal can realize a wave beam scanning function, and the transmission robustness is improved.

The invention discloses a downlink control information transmission method, a terminal device and network equipment. The downlink control information transmission method comprises the following steps: acquiring a plurality of activated transmission configuration indication (TCI) states corresponding to a control resource set (CORESET); according to the activated TCI state of each time frequency resource in the CORESET, receiving downlink control information transmitted on a physical downlink control channel (PDCCH); wherein the activated TCI state of each time frequency resource in the CORESET is determined in the plurality of activated TCI states on the basis of a preset time frequency resource granularity according to a preset rule.