1667results about How to "Improve transmission quality" patented technology

There is a need to prevent two receivers from converging on a state of receiving the same polarization state, fast start receivers, and ensure highly reliable operations. A polarization-multiplexed transmitter previously applies frequency shifts of frequencies +Δf and −Δf to X-polarization and Y-polarization digital information signals to be transmitted. Optical field modulators modulate and polarization-multiplex the signals. As a result, a frequency difference of 2Δf is supplied to X-polarization and Y-polarization components. A polarization diversity coherent optical receiver 215 receives the signal. A frequency estimation portion in a digital signal processing circuit detects a frequency difference signal in both polarization components. This signal is used to a polarization splitting circuit in the digital signal processing circuit.

A relay transmission device can achieve high-quality transmission by suppressing congestion in an ad hoc network, even when a network environment changes or performance of a relay device to be communicated with changes. The relay transmission device includes: an optimization coefficient storage unit (1608) that stores, for each cooperative relay device, a self-optimization coefficient for weighting an amount of data determined by a self-optimization flow control unit (1603) and a total optimization coefficient for weighting an amount of data determined by a total optimization flow control unit (1604); and a balance adjustment unit (1605) that compares, for each cooperative relay device, an influence of congestion caused by transmission bandwidth allocation contention on the relay transmission device and an influence of congestion caused by transmission bandwidth allocation contention on the cooperative relay device, and adjusts the self-optimization coefficient and the total optimization coefficient based on a result of the comparison.

A method for realizing mixed automatic retransmission in communication system containing relay station includes sending data block to opposite end by terminal or base station through relay station, returning reception state of data block back to sending end by relay station after sending process is finished and confirming that it is necessary to retransmit data block or not by sending end according to said reception state.

A skew correction apparatus for increasing the data transfer capacity and thus improving the system performance, by making it possible to carry out the deskew work even during the data transfer, is disclosed. The skew correction apparatus receives a plurality of serial data in synchronism, and reduces the skew mount constituting a phase shift between the serial data. A first correction unit (31) detects a skew between the serial data and corrects the skew during the idle time. A second skew correction unit (32) detects a skew between the serial data and corrects the skew during the data transmission.

An antenna implantable through minimally invasive techniques, preferably comprising a coil with conductive probes is provided. The antenna is preferably superelastic nickel-titanium having an insulative coating. The antenna may conduct a signal originating from a device external to the body of the implantee, or from another implanted device connected to the antenna depending on whether the antenna is employed for sending, receiving, or transceiving signals. Signals may contain data, operational commands, and may be used to transfer power. The implantable antenna may be connected to another implanted device, such as a blood pressure monitor, or may be implanted as a stand-alone device for purposes such as stimulating tissue.

The invention discloses a method for cell-networking, which is used for realizing the flexible planning of a cell and the cell networking in various forms, and improving the availability of a frequency spectrum or saving network resources. The method comprises cell split and cell merge. The cell split method and the cell merge method comprise cell establishment and cell deletion. The cell split method comprises the following steps: calculating the occupation situations of physical resources on a plurality of antennae corresponding to the same cell; determining the physical resources occupied being not less than the prearranged threshold value continually within the prearranged time, and determining to carry out the cell split when reaching the prearranged time; splitting the same cell into at least two cells; and respectively allocating the antennae to the two cells. The cell merge method is similar to the cell split method. The invention further discloses a device, a distributed typebase station and an internal unit thereof for planning a cell.

A data transmission apparatus for relaying data transmitted from the transmitting end in units of packets, each packet having additional information relating to its sequence number, priority and data reproduction time, comprises: a receiving unit for receiving packets transmitted from the transmitting end; a priority decision unit for deciding the priority of each of the received packets; a retransmission packet storage unit for storing packets the priorities of which are equal to or higher than a predetermined value, as retransmission packets, on the basis of the priority of each packet decided by the priority decision unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit for deciding whether retransmission of the packet for which the retransmission request has been made should be performed or not, on the basis of the retransmission request and the storage status of the retransmission packets in the retransmission packet storage unit a transmission queue management unit for setting the transmission order of the received packets and the packets which have been decided as packets to be retransmitted, on the basis of additional information which is given to each packet; and a transmission unit for transmitting the data of these packets in the transmission order set by the management unit. Therefore, the transmission quality in a radio section in real-time transmission is improved and, further, the number of retransmission times is reduced.

The present invention relates to methods and apparatuses for transmitting data in a multicarrier telecommunication system and in particular for performing modulation and coding for low transmission power data. Scheduling information indicating resources on which a terminal is scheduled to transmit data is received at the terminal. The scheduling information includes a modulation and coding indicator set. Data are transmitted on the scheduled resources in accordance with a modulation and coding indicator in the modulation and coding indicator set and with a transmission parameter of the data to be transmitted.

The invention provides a method, device and electronic equipment for retransmission of a lost packet. The method comprises the following steps: receiving data packets sent by a sending end, wherein each data packet carries an information header, and each information header comprises a number of the corresponding data packet; adding the data packets to a cache link list, and carrying out sorting according to the numbers; carrying out traversal to judge whether the data packets in the cache link list are sequential or not; if the data packets in the cache link list are not sequential, when the number of the data packets in the cache link list reaches a preset value, judging whether the number of retransmission request times corresponding to the lost packet is zero or not; if the number of the retransmission request times corresponding to the lost packet is zero, sending a retransmission request to the sending end, and updating a request time corresponding to the retransmission request and the number of the retransmission request times; if the number of the retransmission request times corresponding to the lost packet is not zero, judging whether the difference between a current moment and the current corresponding request time is larger than a single-time retransmission wait threshold or not; and if the difference between the current moment and the current corresponding request time is larger than the single-time retransmission wait threshold, sending the retransmission request to the sending end, and updating the request time corresponding to the retransmission request and the number of the retransmission request times. The method, device and electronic equipment for the retransmission of the lost packet provided by the invention has the advantages that retransmission wait time is shortened, so that the video transmission quality is improved.

Disclosed herein is an optical access network system in which the transmission quality of an upstream signal is remarkably improved in an optical access network in which a Reflective Semiconductor Optical Amplifier (RSOA) is used as the light source for each subscriber. The most important characteristics of the present invention are that a Manchester modulation format is used as a modulation format for a downstream signal in an optical access network system in which an RSOA is used as the light source for each subscriber, so that the problem of deterioration of the transmission quality of a remodulated upstream signal, occurring when an RSOA is used as the light source for each subscriber, is solved, and thus the transmission performance of an upstream signal and the power budget performance of the entire system are improved. According to the present invention, an RSOA-based WDM PON system, in which performance at a power budget and the transmission performance of a remodulated upstream signal are improved, can be implemented.

A per-layer and per-antenna uplink power control method for MIMO transmission of PUSCH in a Long Term Evolution-Advanced (LTE-A) system is provided. A transmit power for a plurality of transmit antennas is calculated based on a power control parameter received in a downlink. Uplink data is transmitted through the plurality of transmit antennas by applying the transmit power to each of a plurality of codewords.

A method of fabricating a mold and a method of fabricating an article with the mold is disclosed that is capable of fabricating a high three-dimensional surface structure and extending the service life of the mold. A mold having a fine surface shape of a height less than an object height is fabricated, then the fine surface shape of the mold is transferred to an intermediate mold by dry-etching, and then the fine surface shape of the intermediate mold is further transferred to a final article material by dry-etching. In each transfer step by dry-etching, the etching selection ratio is appropriately adjusted to increase the height of the fine surface structure step by step, so that the fine surface shape of the final article material has the object height. On the surface of the final article material, a preliminary pattern of the object surface shape may be formed beforehand to reduce the required thickness of the curable resin.

The invention discloses a method, network equipment and a system for data transmission, which can be applied to star and tree networks and dual-homing looped networks. The method comprises that: in a downlink direction, a master node transmits a downlink service signal to a slave node in a mode of optical layer broadcast, wherein a continuous optical signal which carries the downlink service signal also comprises an uplink bandwidth map; the slave node and the master node are connected by an OB (Optical Burst optical burst) channel; and the slave node adapts an uplink service signal to different OBUs for performing photoelectric conversion and transmitting a burst optical signal in a burst mode according to the number and serial number of the OBUs distributed to nodes in the uplink bandwidth map transmitted by the master node. The method, equipment and system easily realize burst amplification and high-speed burst receiving so as to better meet the requirements on long distance, large bandwidth and high transmission quality.

An on-board wireless communication apparatus using an OFDMA scheme includes: a position information acquisition unit which estimates a position after a predetermined time period based on base station position information, mobile station position information, and speed information of mobile station as estimated mobile station position information; a transmission path information storage unit which determines a transmission rate to be applied based on the estimated position information and a distribution of the transmission rate determined by a distance from the base station; a reception buffer unit which stores received data; a reception buffer amount adjustment unit which determines a data amount to be received based on a data storage amount from the buffer unit and a type of the data therein; and a band allocation unit which determines a band requested to the base station by the transmission rate from the storage unit and the data amount from the adjustment unit.

A baseband signal predistortion processing device and method. Said device includes: a predistorter, for preserving and updating nonlinear filter parameter, carrying out power statistic of input signals, selecting corresponding nonlinear filter parameter according to the power statistical result and predistortion-processing baseband digital signals by use of said corresponding nonlinear filter parameter, and outputting the predistortion processed baseband digital signals; an adaptive parameter calculating unit, for calculating nonlinear filter parameter according to received feedback signals of radio-frequency channel and sampled signals of baseband digital signals, and transmitting the calculating result to the predistorter. Said method can not only solve the nonlinear problem of power amplifier, but also can select different non-linearity inverse model according to different input signal and power amplifier characteristic, and increase whole efficiency of base station transmitter.

A relay device can perform high-quality communication even in a wireless mesh network where relay devices are densely arranged and interference of wireless packets is caused. The relay device includes: a representative node determining unit (605) which determines the channel used in its own cluster for intra-cluster communication to be a channel different from the channel used in neighboring cluster for intra-cluster communication, when the communication quality of its own relay device does not meet predetermined quality and no representative node exists among neighboring nodes; a joining and removal notifying unit (607) which allows a neighboring node which is not associated with any cluster to join to its own associated cluster; and a frequency channel changing unit (609) which changes the channel used for intra-cluster communication to the channel determined by the representative node determining unit (605) of the representative node.

An effective data multiplexing method wherein an error correction ability is exerted at the maximum so that data transmission quality is improved and a data transmitting method in which an interleaving process applicable to data transmission using interpolation pilot signal is performed are provided. The data multiplexing method includes the steps of: coding input data for each input channel; multiplexing said data which is coded; performing an interleaving process on said data which is multiplexed; and outputting said data. In the data transmitting method, when an interleaving process is performed, an interleaver is used in which the number of columns of the interleaver is twice as many as the number of slots of a frame.

The packet loss in a wired section is reported to a receiving terminal (61) using a loss notification packet from a gateway (62) located at the boundary between a wired section and a wireless section, and thus the causes for packet loss are separated. Also, using this loss notification packet, the packet loss rate in the wired section and the wireless section are separately calculated and the transmission rate and robustness of the data packets are determined with a sending terminal (60) in accordance with the respective loss rate of the sections.

The invention discloses a live video data transmission error control method based on mobile network packet loss status, the method is characterized in that the mobile network packet loss status is divided into four types according to wireless link signal to noise ratio and mobile network congestion packet loss probability: link error code packet loss, linkage interrupt packet loss, congestion-error code packet loss and congestion-interrupt packet loss, so that different error control methods are adopted in the application layers in the light of different mobile network packet loss statuses; the self-adaptive dynamic FEC (forward error correction of coding) error control method is adopted when the mobile network is in the link error code packet loss status; the active retransmission error control method is adopted when the mobile network is in the linkage interrupt packet loss status; the static state FEC error control method is adopted when the mobile network is in the congestion-error code or congestion-interrupt packet loss status. Through the adoption of the invention, package loss of live video data in the transmission process is effectively reduced, and the visual experience of terminal users of the mobile live video is improved.

A package having a plurality of stacked substrates is provided. The package has at least two substrates. One substrate is stacked over the other to construct a three-dimensional circuit structure. Elements are disposed on the respective substrates. At least a conductive column is disposed between the two substrates. A lead-frame is connected to the substrates or the elements. The lead-frame also has a plurality of leads. The two neighboring substrates are electrically connected through the conductive column so that the average signal transmission length is shortened and the signal transmission quality is improved. Furthermore, the conductive column increases the mechanical strength of the package and reduces the degree of warping in the package so that a longer life span can be expected.