831results about How to "Reduce implementation complexity" patented technology

The invention provides a frequency domain channel estimation method for an orthogonal frequency division multiplexing system, characterized in that a pilot frequency sub-carrier phase is compensated at a receiving terminal. According to the invention, the effect of pilot frequency sub-carrier position offset to channel estimation accuracy is eliminated, which exists DFT interpolating estimating algorithm with noise suppression function and frequency domain channel estimating algorithm for the OFDM system, and the implementing complexity is low, making the method suitable for hardware implementation.

The invention provides a method for predicting and selecting the optimum prediction mode in frame and a device hereof; the method comprises that the position of coding block is judged to acquire a judgment result; when the judgment result indicates that the coding block is neither on the leftmost side of the image nor on the top of the image, the prediction modes of the preset number are selected according to the sequence number in ascending order from other prediction modes except the DC prediction one; a first prediction mode with the minimum residual error is selected from the preset number of prediction modes and the mode with the minimum RDcost is selected from the first prediction mode, neighboring prediction modes of the first prediction mode in the prediction direction, the most possible prediction mode and DC prediction mode to be used as the optimum one. The invention could reduce the complexity for realizing intra-frame prediction and accelerate processing speed.

A central base station for interference management in a distributed antenna system comprises a processor; a memory; and a frequency partition module configured to divide the remote radio heads into clusters and allocate a frequency band to each cluster. Multiple clusters use the same frequency band and groups of clusters are formed. A joint scheduler is configured, for each group, to activate at most two clusters at any given time and deactivate remaining clusters in the group, one of the at most two activated clusters being a serving cluster of the group, and to associate one or more users with the serving cluster in the group. An interference alignment module is configured to apply downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters.

The invention discloses a wireless transceiver applied to a time division duplex (TDD) system. The wireless transceiver comprises a digital circuit module, an analog circuit module, a switching control module, a route selector, a transceiving conversion module and an antenna, wherein the analog circuit module comprises a transmitting path and a multiplexing receiving path; and the switching control module controls the operation of the transceiving conversion module and the route selector. When the antenna and the transmitting path are connected by the transceiving conversion module, a digitalpredistortion (DPD) processing unit of the digital circuit module is connected by the route selector and then the multiplexing receiving path is used as a feedback receiving path; when the antenna and the multiplexing receiving path are connected by the transceiving conversion module, a digital signal processing unit of the digital circuit module is connected by the route selector and the multiplexing receiving path is used as a normal receiving path; and the volume and realization cost of the circuits are reduced by the multiplexing of a common receiving path and the feedback receiving path.

A noise and interference power measurement apparatus for an antenna diversity system that services a plurality of users with an array antenna having a plurality of antenna elements. A channel estimator estimates a channel impulse response for a radio channel corresponding to a predetermined plurality of regularly spaced direction-of-arrival (DOA) values. A data estimator estimates the received data using a received signal and a system matrix. A quantizer quantizes the estimated data. An interference and noise calculator calculates noise vectors at the respective antenna elements by removing from the received signal an influence of the quantized data to which the system matrix is applied, calculates an estimated noise matrix at the plurality of antenna elements, calculates interference power by auto-correlating the estimated noise matrix, and calculates noise and interference power based on the interference power.

The invention provides a method for ensuring the operation consistence of distributed metadata in a cluster file system in combination with a local log. The method comprises the following steps of: making a coordinator and a participant record a distributed metadata sub-operation update generated by using distributed metadata sub-operation in the local log as a local transaction, wherein the record of the distributed metadata sub-operation update includes a distributed transaction and/or a distributed metadata update; after the local transaction is submitted, writing the distributed transaction into a distributed log, and writing the distributed metadata update into a metadata disk; and before starting the distributed metadata sub-operation, forcibly submitting a local log transaction. According to the method, the local log is multiplexed effectively, and the implementation complexity of the distributed log is lowered; and moreover, cascading aborts can be avoided.

The invention discloses a random access method, device and equipment, and the method comprises the steps that a network node receives a random access request, wherein the random access request at least comprises a precursor and a first data block; the network node transmits an RAR (random access response) to a terminal; the network node receives a second data block transmitted by the terminal or receives the random access request again.

The invention relates to a physical-layer sub-channel allocation method, an emission system and a receiving system. Physical-layer channels are divided into a plurality of basic channel units on time or time and frequency; the basic channel units transmit data on corresponding divided time or/and frequency fragments; the needed basic channel units for transmitting newly added business are determined according to business demand and are reserved; the reserved basic channel units are merged into a newly added physical layer sub-channel assigned to the newly added business; and after basic business and the newly added business are coded and modulated respectively, the newly added business is transmitted in the newly added physical layer sub-channel, while the basic business is transmitted in the rest of the physical-layer channels. Under the circumstance of guaranteeing the complete compatibility with the prior national standard system, the invention has the advantages of providing the newly added business with enhanced code modulation besides the basic business, reducing the cost and power consumption of receivers and realizing complexity.

A sound encoding device comprises the time changing prediction analysis module to get the stimulation signal, time frequency mapping module to get the stimulation signal, encoding module to get the low frequency wave encoding data, middle frequency encoding data and high frequency parameter encoding data, bit current complex module for the repetitive use of the parameter encoding data to output sound encoding data. It also relates to a sound encoding method, a sound decoding device and method. It can realize high quality encoding for the sound and music at low code rate.

The invention discloses a traffic safety management (TSM) information multihop broadcasting method. The method comprises the following steps of: detecting a traffic safety event vehicle to serve as a source node to broadcast TSM information; calculating a reference waiting time slot Tn of a highway section in which a node is positioned by the node which receives the TSM information according to a weight factor, namely the distance between the node and the source node, dynamically regulating additional forwarding waiting time Delta n according to an estimated value of link quality signal to interference plus noise ratio (SINR), and calculating and acquiring waiting time tn of the node for transmitting a message; and when the waiting time tn is reduced to zero, immediately broadcasting request traffic forward (RTF), after a previous forwarding node receives the RTF, determining a single relay node to transmit a data packet, and immediately forwarding the received TSM information after the node receives the RTF. By the method, link quality information is combined, data forwarding reliability is fully guaranteed, the phenomenon of forwarding collision between multiple nodes in the same highway section is reduced at the same time, and the link load and data redundancy in a media access control (MAC) layer are effectively reduced based on an RTF/authorized traffic forward (ATF) forwarding confirmation mechanism.

The embodiment of the invention discloses system, device and method for a load balancing, wherein the method comprises the following steps: a network exchanger is used for obtaining the characteristic information in a user data flow; when the characteristic information satisfies a predetermined first load balancing strategy, the received data message in the user data flow is forwarded to a plurality of server units connected with the network exchanger according to the first load balancing strategy, so as to realize a low-layer load balancing; and when the characteristic information satisfies a predetermined second load balancing strategy, the received data message is sent to a piece of load balancing equipment, then the data message is forwarded to the plurality of server units connected with the network exchanger according to a forwarding strategy determined by the load balancing equipment, so as to realize a high-layer load balancing. The system, device and method for a load balancing disclosed by the method are suitable for the field of network management system.

The invention discloses a hyperspectral and panchromatic image fusion method for extracting spatial features based on AAE, which solves the problems of serious spectral distortion and insufficient spatial detail injection in the existing hyperspectral image fusion, and comprises the following implementation steps of: obtaining an image data set for preprocessing; constructing and training a hyperspectral image spectrum constraint adversarial auto-encoder network; extracting spatial features of the hyperspectral image; acquiring space details of the enhanced panchromatic image; fusing the spatial information of the hyperspectral image and the enhanced panchromatic image; constructing a gain matrix; and obtaining a hyperspectral image with high spatial resolution. Hyperspectral and panchromatic image space information is considered at the same time, deep space features are extracted through AAE, spectral loss is effectively reduced, and the space resolution is effectively improved. Simulation proves that the hyperspectral image fusion method is better in fusion index and visual effect space and spectral performance, better in space detail maintenance and more perfect in spectral information, and is used for hyperspectral image fusion processing.

The method comprises: converting the received spread spectrum signals to the digital signals, and dividing the digital signals into the in-phase and quadrature signal components. In the capturing stage, the in-phase and quadrature signal components and the local pseudo random noise code are executed with relevant calculation to get the output of several in-phase and quadrature signal components; making summation for the square of each in-phase and quadrature signal components output to get the signal power and noise power in order to figured out the signal/noise ratio of the spread spectrum signals. In the tracing stage, the in-phase and quadrature signal components and the local pseudo random noise code are executed with relevant calculation; making the summation for the square of output result; based on the in-phase and quadrature signal components, figuring out the average power of noise; based on the signal power and the average power of noise, figuring out the signal/noise ration of spread spectrum signals.

The invention discloses a multi-Femtocell downlink power interference control method based on a game theory, which mainly solves the problem that a Femtocell downlink signal generates severe interference with a downlink signal of a long term evolution (LTE) macro base station user. The method comprises the following steps of: 1) calculating throughput before an outdoor macro base station user deploys the Femtocell; 2) determining the maximum interference threshold of a plurality of Femtocell users on the macro base station user according to restricted interference conditions of the outdoor macro base station user so as to obtain an optimized model; 3) gaming between throughput loss of the macro base station user and transmitting power through the Femtocell users according to the optimized model, and calculating a Nash equilibrium point of the optimized model so as to obtain the optimal transmitting power; and 4) controlling a descending ratio of the throughput of the macro base station user to be within 5 percent according to the optimal transmitting power. A power control technology is combined with the game theory, the method has the advantages of energy saving, interference reduction, low realizing complexity and high practicality and can be used for controlling the interference caused by downlink power of a multi-Femtocell system, and the capacity of the system is improved.

This invention relates to a frequency domain demodulation device and a method based on a blocking transmission system of a filter set, which first of all makes DFT transformation of Q=DxN point to convert time domain data to a those of frequency domain, then caries out single dot or MMMSE balance to each equivalent sub-carrier based on its position corresponding to the frequency spectrum and estimated channel frequency response then caries out matched filter to the position, energy collection and frequency offset compensation operation and applies multiple D IFFT to convert the frequency domain data of the sub-band to those of time domain and finally a K dot inverse orthogonal transformation device carries out K dot inverse orthogonal transformation to input symbol sequence output by the K parallel-serial converting device to finish demodulation of transmitted signals of the filter set.

The invention is used in IPTV network comprising IPTV service system, set-top box and display device. The system comprises: a subtitle control module located in IPTV service system, which is used for defining the subtitle information in a HTML webpage, and sending the HTML webpage to said set-top box; a subtitle resolving module located in said set-top box, which is used for translating the HTML webpage to a displayable webpage; a subtitle stacking module located in the set-top box, which is used for stacking at least a part of the displayable webpage into the display interface on the screen.

The invention discloses a main/standby switching method, a system and equipment of IR (Infrared Radiation) ports. The method comprises the following steps of: detecting the states of a main IR port and a standby IR port by BBU (Baseband Processing Unit) equipment in real time; if the main IR port is detected to be abnormal and the standby IR port is detected to be normal, sending a main/standby switching command of the IR ports to RRU (Radio Remote Unit) equipment by the BBU equipment; and switching service data and an application layer message which are transmitted on the optical fiber of the main IR port onto the optical fiber of the standby IR port for transmitting. By utilizing the invention, the influences on the service loaded on the RRU equipment of the main/standby switching of the IR ports can be greatly reduced.

The mentioned sending structure includes a user signature sequence (USS) and user-control info (UCI). The time domain circular shift, between the mentioned signature sequence with implicit user-control info and USS, is an integer multiplied by Ns, the step length of circular shift. At the integer locates the control info. This invention provides a reliable way to transmit user-control info in the multi-user competing channel. It takes full advantage of the excellent related characteristics of the Zadoff-chu sequence to overcome interference from multi-user. In addition, this invention can be simply realized. Due to the sameness of the detection of the user signature sequence (USS) with a special structure as the detection of the traditional USS, the former USS can carry user-control information without adding extra complication to the user detection.

The invention provides an encoding method of an LDPC (Low Density Parity Check) code. The encoding method comprises the following steps of: adjusting elements of a modular matrix Hbm by using an expanding factor zf to generate an adjusted modular matrix Hbmf; expanding by using the modular matrix Hbmf to generate a check matrix H, wherein the expanding mode is as follows: sub-matrixes Pi and j in the check matrix H expand according to the value of the modular matrix Hbmf, and each of the sub-matrixes Pi and j is a full zero matrix, a unit matrix or a unit matrix for left and right cyclic shifting according to a line direction; and encoding input information U by using the check matrix H and outputting encoding information V. The invention also provides an encoder of the LDPC code. According to the technical scheme proposed by the invention, through increasing the quantity of zero elements of the modular matrix Hbm, the processing complexity and the implementation complexity of the encoding and the decoding of the LDPC code can be reduced, and the processing speed of the encoding and the coding can be improved.

The application provides a control method and apparatus for an intelligent device. The method comprises: a first control instruction that is applied to a target intelligent device and is sent by a user client is received; on the basis of cloud firmware that is downloaded from a server side and corresponds to the target intelligent device, instruction parsing is carried out on the control instruction, so that the first control instruction is converted into a first protocol instruction; and the first protocol instruction is issued to the target intelligent device, so that the target intelligent device is controlled to execute corresponding control motion. According to the application, burning of firmware for all intelligent devices is not required, so that centralized management and control of the firmware and the intelligent devices can be realized well.