32 results about "Effective data transfer rate" patented technology

Multi-drop communications channels can have significantly deep notches in their frequency response causing a corresponding limitation of the effective data transmission rate. A special time-ordered coding method is described which results in the emitted spectrum of the data stream transmitted into the channel having a notch at the same frequency as the notch in the channel frequency response, permitting channel receivers to successfully decode the transmitted data stream. The described coding method may be applied at various multiples of the channel notch frequency to support different throughput rates, and may be combined with other coding techniques such as group or vector signaling codes.

The invention relates to a method for sharing channels, comprising the following steps of: A. distributing an idle registration channel for a cognitive user; B. detecting whether an authorized user appears or not, if the authorized user appears, distributing the registration channel for the authorized user, and measuring an interference temperature threshold for ensuring that the authorized user normally uses the registration channel, acquiring the maximum available power of the cognitive user according to the interference temperature threshold, and if the authorized user does not appear, continue to detecting; and C. calculating whether the cognitive user can carry out data transmission or not by using the maximum available power, if so, regulating the transmitting power of the cognitiveuser, and if not, switching the cognitive user to the idle channel. Moreover, the invention also relates to a system for sharing channels. The method and the system for sharing channels judge whetherthe cognitive user can carry out data transmission or not by using the maximum available power to control the action of the cognitive user, which greatly reduces the frequency spectrum switching efficiency, improves the frequency spectrum use ratio and network performance and meanwhile also improves the effective data transfer rate.

A transfer start/end detecting section detects timing at which a DMARQ signal becomes an H level or an L level. A transfer time-measuring section measures a transfer time during which data transfer is actually performed within a period in which a predetermined number of data blocks are transferred. A transfer byte count-measuring section measures a transferred byte count of data that have successfully been transferred. An effective data transfer rate-computing section computes an effective data transfer rate by dividing the transferred byte count by the transfer time. A transfer rate-comparing section compares the effective data transfer rate with a transfer rate that is one step slower than a current transfer rate output from a selectable transfer rate-storing section. If the former is slower, a transfer rate-switching section switches to the transfer rate that is one step slower. A large decrease in the effective data transfer rate caused by data corruption is prevented.

In accordance to one aspect, a method for optimizing the effective data transmission rate in a bus system, in particular in automation technology is provided. A data telegram used in higher-order data networks based on the Internet protocol, with at least one data telegram, at least one data segment and/or at least one data section being generated and/or modified and/or deleted by at least one slave. The topology of the bus system can hereby be selected according to the application and is taken into account in the configuration of the data contained in the data telegrams, without infringing the protocol characteristics of the higher-order data network. The number of data telegrams required is hereby significantly reduced, in particular on communication links with maximum loading.

Position detection means (11), time detection means (12), weather detection means (13), and transmission rate detection means (14) detect the current position, the current time, the weather, and the valid data transmission rate of a mobile reception device (3). According to the detection results, communication environment information is generated. The communication environment information is used for prediction or recognition of the communication condition between the transmission device and the mobile reception device.

The invention discloses an optimal relay selection method based on a social threshold in D2D cooperative communication. The method comprises the following steps: in the detection phase of each relay node, firstly a DT sends a detection data packet to a relay user rj, the relay user rj obtains a social trust value (the formula is as shown in the specification) with the DT and an instant signal to noise ratio(the formula is as shown in the specification) with a DT-relay link; if (the formula is as shown in the specification) is greater than or equal to the threshold (the formula is as shown in the specification) of the set social trust value, the relay user rj continues to detect the relay-DR link; the received detection data packet is forwarded to the DR at transmission power in directly proportional to (the formula is as shown in the specification), the DR obtains the signal to noise ratio (the formula is as shown in the specification) and feeds back (the formula is as shown in the specification) to a D2D transmitting end DT; otherwise, the relay user rj is not will to provide relay service for the DT, and the DT detects the next relay node; and the DT calculates the data transmission rate Cj of the relay link of the relay user rj that is will to provide the relay service for the DT and selects the optimal relay node according to the optimal stopping theory. By adoption of the optimal relay selection method disclosed by the invention, the detection time of the relay link can be effectively shortened, and the effective data transmission rate and the throughput of the relay link are improved.

The invention discloses a self-adaption transmission mode selecting system and method for a vehicle communication access network. The system comprises a vehicle information service flow generating module, a vehicle information service flow classifying and mapping module, a grouping and submitting module, a self-adaption transmission mode selecting module, an OFDMA wireless resource allocating module, a frame sending/receiving module and an access channel/driving state/local geographic area information detecting module which are arranged at the I/B position. The system further comprises a vehicle information service flow generating module, a vehicle information service flow classifying and mapping module, a grouping and submitting module, a self-adaption transmission mode selecting module, an OFDMA wireless resource allocating module, a frame sending/receiving module and an access channel/driving state/local geographic area information feedback module which are arranged at the SV position. The self-adaption transmission mode selecting system introduces an OFDMA technique and an AMC technique, can balance ITS information service flow transmission effectiveness and system transmission efficiency, can meet the QoS requirements of various ITS information service flows and meanwhile can acquire high system average effective data transmission rate.

The invention discloses an adaptive bandwidth adjustment method for industrial field communication, which belongs to the technical field of communications. The method comprises the steps of (1) performing early-stage preparation of cyclic communication; (2) estimating the current bandwidth and predicting a channel gain matrix corresponding to the pre-spread spectrum bandwidth by using a Gaussian process regression algorithm after entering cyclic communication; (3) obtaining and comparing the current receiving end rate v; (4) comparing the mean value of the channel gain matrixes H; (5) carryingout cyclic detection when any condition in the step (3) or the step (4) is not met; and (6) carrying out bandwidth adjustment after further judging the channel gain matrix corresponding to the pre-spread spectrum bandwidth when any condition in the step (3) or the step (4) is met. According to the invention, an accurate channel estimation result is obtained by combining a channel estimation algorithm based on an intelligent algorithm and is evaluated; meanwhile, in combination with the effective data transmission rate v of the current receiving end, the bandwidth is dynamically adjusted according to the effective transmission rate V of the specified communication system; and the communication resource cost is saved under the condition that the communication rate requirement is met.

The invention provides a method and a device for selecting an enhanced transport format combination. The method comprises the following steps of: determining the size of a transport block of an enhanced dedicated channel (E-DCH) according to an authorization resource when a high speed uplink packet access (HSUPA) service is established; counting acknowledgement indicators received by an E-HICH in the process of the HSUPA service and adjusting the size of the transport block of the E-DCH according to a counting result; and redetermining the size of the transport block according to the changed authorization resource when the authorization resource changes in the process of the HSUPA service. The method and the device can effectively improve the effective data transmission rate of the HSUPA service.

The invention provides a method for improving the image data acquisition rate of a processor, which comprises the following steps of: before the processor acquires image data, only sampling Y data and not sampling U data and V data by utilizing two-frequency-division sampling of a sensor transmission pixel clock PCLK, namely, removing the U data and the V data before the processor acquires the data; and enabling the processor to process all the data after receiving the data, and extract Y data, namely gray data, as image data. The method is simple and easy to operate, the logic circuit is used for controlling the sampling clock so as to control and collect the effective data Y, the data volume to a processor interface is reduced, and the effective data transmission rate is improved.