272 results about "Total frequency" patented technology

In an OFDMA mobile communication system in which a total frequency band is divided into a plurality of sub-carrier bands, for signal transmission, to assign sub-carriers to MSs, a BS divides the total frequency band into L sub-frequency bands. The BS detects the channel condition of each of the MSs and determines a sub-frequency band for each MS according to the channel condition among the L sub-frequency bands. The BS assigns sub-carriers in the determined sub-frequency band at a predetermined sub-carrier spacing to each MS.

Disclosed herein are a method of transmitting a frame for supporting a legacy system, and a method and an apparatus of searching a cell using the same. A frame including a first frequency band for supporting a mobile communication system and a second frequency band for supporting a legacy system and having a total frequency band larger than the second frequency band is generated. Primary broadcasting information related to a frequency bandwidth is transmitted through a broadcasting physical channel of the second frequency band.

A method and system for using frequency resources in a communication system are provided. In the method and system, a total frequency band is divided into at least two frequency subbands and there is a guard interval between frequency subbands. A first frequency subband includes a TDD UL frequency subband and a TDD DL frequency subband. A second frequency subband includes an FDD UL frequency subband. A BS sets a frequency band between the TDD UL frequency subband and an FDD UL frequency subband as an additional UL frequency subband, and receives a signal from an MS in the additional UL frequency subband.

An interference suppression scheme is provided for a radio receiver. According to the provided interference suppression scheme, the bandwidth of a received pilot signal and a data signal is divided into a plurality of frequency sub-bands. The pilot signal and the data signal have been transmitted according to single carrier data transmission technology. Interference parameters are calculated for each frequency sub-band separately. Interference suppression may be carried out jointly or separately for each frequency sub-band. After the interference suppression, the frequency sub-bands are combined. A filter bank may be used for dividing the total frequency band into sub-bands.

An apparatus, system, and method, for determining the total frequency response of a communication system, include one or more testers each having a tuner, digital demodulation circuitry, and a controller that measures an absolute power level at the tester location for a particular channel and that measures a relative frequency response for the channel based on the tap weight coefficients from the digital demodulation circuitry. The absolute and relative measurements are combined and then recorded by each tester. The combined values of two or more testers are compared to determine the total frequency response of the communication system. The relative response measurements are converted from time domain to frequency domain by fast Fourier transformation. The controllers maintain a channel plan for sequencing the sweeping of consecutive channels.

An apparatus and method for transmitting/receiving a pilot pattern set to distinguish a base station in an FDM communication system. The method divides a total frequency bandwidth into at least two sub-bandwidths including a plurality of sub-carriers in an OFDMA (Orthogonal Frequency Division Multiple Access) mobile communication system, configures a single frame cell (FC) using one sub-bandwidth from among the sub-bandwidths and a plurality of OFDM (Orthogonal Frequency Division Multiplexing) symbol intervals, and assigns a pilot signal to a time-frequency cell comprised of at least one OFDM symbol and at least one sub-carrier within the FC. The method includes the steps of spreading a pilot signal and a data signal using different orthogonal codes, synthesizing the spread pilot and data signals, and performing a CDM (Code Division Multiplexing) process; and mapping the CDM-processed pilot and data signals to a predetermined time-frequency cell in the FC.

Reconfigurable direct radio frequency (RF) bandpass sampling receivers are disclosed that provide direct RF sampling of an input signal spectrum passed through a bandpass filter that is tunable over a wide frequency range of interest and that is sampled based on the bandwidth of the filter rather than the bandwidth of the total frequency range of interest. The bandwidth of the filter may further be variable to provide for optimized search against a variety of signal bandwidths. The reconfigurable direct RF bandpass sampling receiver may be implemented with a single fixed clock for applications where the signals of interest lie in adjacent non-overlapping frequency channels. For applications requiring arbitrary tuning, the reconfigurable direct RF bandpass sampling receiver can also use a programmable or switched sampling clock to avoid the Nyquist sample boundaries that occur with bandpass sampling and thus provide sampling of arbitrary frequencies. A high-speed analog pre-sampler may be included to extend the maximum frequency range that can be sampled.

The invention discloses a web page resource recommendation method and device, relating to the field of computers. The method comprises the following steps of: calculating the ratio of the frequency a subscriber marks web page resources with labels to the total frequency the subscriber marks the web page resources, marking the subscriber as the close subscriber of a certain label when the ratio value corresponding to the label is larger than a preset threshold value, and otherwise, marking the subscriber as the remote subscriber of the label; and outputting the web page resources to the subscriber according to the corresponding recommendation list of the close subscriber and the remote subscriber. The embodiment of the invention can recommend different web page resources to different subscribers according to the different types of the subscribers, so that the recommendation of the web page resources is more accurate, timely and effective. The embodiment of the invention is favorable for subscribers to quickly and conveniently find interesting web page resources.

A method and apparatus for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, and allocating the subchannels to at least one mobile station in an OFDMA mobile communication system. The method includes receiving channel state information; comparing the received channel state information with a predetermined threshold, calculating an average occurrence length of a case in which the received channel state information is greater than the threshold, calculating a state hold prediction value, calculating an estimation value, sorting the calculated estimation values according to subchannels in order of their levels, and allocating subchannels according to the at least one mobile station in the sorted order.

A method of transmitting a signal by using an Adaptive Modulation and Coding scheme in a Frequency Hopping-Orthogonal Frequency Division Multiplexing Access communication system capable of dividing total frequency bands into a plurality of sub-carrier bands and including a plurality of sub-channels, which are sets of predetermined sub-carrier bands, and a plurality of cells. The method includes the steps of allocating a predetermined number of sub-channels as AMC sub-channels per each cell matching with predetermined conditions in order to apply the AMC scheme to the AMC sub-channels, and allocating remaining sub-channels except for the AMC sub-channels as FH-OFDMA sub-channels in order to apply an FH-OFDMA scheme to the FH-OFDMA sub-channels.

This invention discloses a method for estimating frequency deviation in OFDM system, which first of all carries out deltafcoarse estimation based on the received front and back two sequences of the received down-line synchronous OFDM symbol, then caries out deltafcoarse adjustment to two arrays of pilot symbols and again carries out deltaffine estimation based on the two arrays of pilot symbols and finally carries out total frequency deviation estimation based on them.

The invention discloses an optimal capacity estimation method for energy storage in the field of frequency modulation of a power system. The method comprises the steps of building an energy storage output power module, and determining adjustable capacity of energy storage according to the energy storage output power module; building an output power model of a conventional machine set, and determining adjustable capacity of the conventional machine set according to the output power model of the conventional machine set; building frequency modulation dispatching strategy model, and adjusting capacity of energy storage or the conventional machine set according to frequency modulation capacity required by the power system and the adjustable capacity of energy storage or the adjustable capacityof the conventional machine set; building a frequency modulation compensation rule module, and determining compensation amount of energy storage or the conventional machine set according to the frequency modulation compensation rule model; setting a capacity ratio of energy storage; building a frequency modulation time sequence simulation model, building a simulation algorithm input database, andperforming frequency modulation time sequence simulation according to the capacity ratio of energy storage; and calculating total frequency modulation compensation fee of all conventional machine sets and energy storage within a typical frequency modulation day according to data within a certain time.

To rapidly retrieve and specify a product including a specific component from data on production results, and to output a retrieval result with priority order set in the case that a plurality of candidates are retrieved. In this product data retrieval system, data of a product configuration are produced from data on work results and are stored so as to rapidly specify the product including the specific component, and the rapid retrieval related to the product is performed by use of it. In the case that the plurality of candidates can be specified and cannot be narrowed down to one candidate, strong/weak data on possibility are imparted by totaling frequency of the possibility to perform the retrieval.

A communication resource management device changes the transfer rate of a first control channel related to a first mobile terminal according to a communication condition. The device determines whether there is a frequency band for which it is not determined whether the frequency band is to be used in a predetermined time period based on a current transfer rate of a second control channel related to a second mobile terminal and an amount of data to be transmitted in the second control channel; and allocates, to the first mobile terminal, at least a part of the frequency band for the second control channel with respect to the second mobile terminal in a predetermined period of time. The device changes the transfer rate in the first control channel while maintaining the total frequency band for plural control channels related to plural mobile terminals at a constant value.

The invention discloses a smart home control system which comprises a master control system, a control terminal connected to the master control system, and smart home equipment, wherein the control terminal comprises at least one host control terminal and at least one guest control terminal; the master control system comprises a communication module, a registration module, an authority management module; the communication module is used for establishing connection with the control terminal and the smart home equipment; the registration module is used for registering the smart home and control terminal and distributing the unique ID; the authority management module comprises a recording unit, an authority calculation unit and an authority distribution unit; the recording unit is used for recording the first registration time of each guest control terminal and the total frequency of accessing to the system from the registration date and generating corresponding recorded information; the recorded information is bound to the guest control terminals; the authority calculation unit is used for calculating the period of connecting the guest control terminal to the system according to the total frequency of accessing the guest control terminal to the system and the registration time and calculating the corresponding authority value according to the period; and the authority distribution unit is used for distributing smart home setting for the control terminal. According to the system disclosed by the invention, the authority management problem is solved.

The invention discloses a timing frequency synchronization method based on an improved Park frequency domain training sequence. The timing frequency synchronization method comprises the following steps: firstly sending a training sequence before an OFDM data symbol is sent, wherein all the sub carriers of the training sequence in the frequency domain respectively send a pseudorandom real number, and structure of a corresponding time domain training symbol is conjugate symmetric; performing timing synchronization by an FS-Park synchronization method firstly by using the time domain training symbol, then performing estimation on fractional part of frequency offset based on a cyclic prefix in the time domain and performing estimation on integral frequency offset by utilizing cross correlationof the training sequence in the frequency domain, obtaining the total frequency offset, namely the sum of the integral frequency offset and the fractional part of frequency offset, and completing synchronization. The timing frequency synchronization method disclosed by the invention designs a new training sequence, and then a more ideal time domain training symbol structure is obtained; and thenbased on the training sequence and the corresponding time domain training symbol thereof, the integral frequency offset and the fractional part of frequency offset are estimated respectively, and timing synchronization estimation is performed.

The present invention provides a filter device allowing unnatural variation in image quality caused by image processing to be suppressed. The filter device including a filter section performing a filtering operation on an input image data so that, when time-varying amount in a total frequency value in a neighboring-classes block configured with a couple of neighboring classes in a histogram distribution of the input image data is equal to or less than a predetermined value, time-varying amount of a frequency value in each of the classes in the neighboring-classes block is suppressed to be equal to or less than a predetermined limitation value.

The invention provides a concrete mixing truck, and a control apparatus and a control method thereof. The apparatus comprises a plurality of sensors and an intelligent controller; signals collected by the plurality of sensors at least comprise an engine rotating speed signal, a mixing drum rotating speed signal and a main oil pump displacement signal; the intelligent controller comprises an analysis module used for analyzing an expected mixing drum rotating speed based on a transit time of the transit mixing truck and a preset mixing drum revolution total frequency according to a concrete transit mixing standard, a mixing drum rotating speed control module used for controlling the mixing drum to mix concrete in the expected mixing drum rotating speed according to the mixing drum rotating speed signal or controlling the mixing drum rotating speed according to a preset concrete transmit mixing requirement, and an energy saving matching module used for controlling the engine rotating speed of the mixing truck and the main oil pump displacement according to a best fuel oil consumption curve. In the invention, the concrete mixing quality is guaranteed, and energy saving is also realized.

A system and method for utilizing resources in a communication system are provided, in which a cell is divided into N sectors, a total frequency resource is divided into a center frequency region and a normal frequency region, the center frequency region is divided into N or more center frequency bands, and resources are allocated so that one sector uses at least one center frequency band and a normal frequency band corresponding to the normal frequency region.

The invention discloses a method, device and equipment for distributing scheduling subbands and a readable storage medium. The method comprises the following steps: receiving downlink control information (DCI) sent by a base station, and determining scheduling subbands in a physical uplink sharing channel (PUSCH); and establishing a corresponding relation between precoding indications in the DCI and the scheduling subbands in the PUSCH according to at least one parameter of the total number of the scheduling subbands in the PUSCH and a total frequency domain distance of the scheduling subbandsin the PUSCH and the total number of the precoding indications in the DCI. The method solves the problem on indication transmission of precoded information of the uplink scheduling subbands, and theprecoded information of the uplink scheduling subbands at a dynamically changing number is informed through fixed precoding indications in the DCI.

The invention provides an energy storage system participated power grid secondary frequency control method and device. The energy storage system participated power grid secondary frequency control method comprises the steps that power grid frequency is monitored, and power grid frequency is controlled when deviation of power grid frequency occurs: power grid secondary frequency control requirements ARR are determined; the participation factors of a frequency modulation unit are determined; a basic secondary frequency modulation instruction is determined according to the ARR and the participation factors; the additional secondary frequency modulation instruction of a power generator unit sharing the frequency modulation task of an energy storage unit is determined; the total frequency modulation instruction of the energy storage unit and the power generator unit which does not share the frequency modulation task of the energy storage unit is determined, and the total frequency modulation instruction is transmitted to the energy storage unit and the power generator unit which does not share the frequency modulation task of the energy storage unit; and the total frequency modulation instruction of the power generator unit sharing the frequency modulation task of the energy storage unit is determined, and the total frequency modulation instruction is transmitted to the power generator unit sharing the frequency modulation task of the energy storage unit so that power grid secondary frequency control can be realized. The problem of coordination and cooperation of an energy storage system and other units in the aspect of secondary frequency modulation can be greatly solved.

The invention discloses a distributed secondary frequency modulation control method considering energy storage, and belongs to the technical field of power grid secondary frequency modulation power generation. An inferiority index function based on the charge and discharge power offset and the state of charge offset is established for the condition of secondary frequency modulation having participation of energy storage, and the inferiority index function based on the power offset is established for the condition of secondary frequency modulation having participation of the conventional motorset. The consistency variable of a frequency modulation power supply is determined by the partial derivative of the inferiority index function relative to the power offset, and then the secondary frequency modulation demand quantity is allocated according to the proportion of the maximum power offset of the frequency modulation power supply relative to the total frequency modulation power of the system. Minimization of the power offset and the state of charge offset acts as the consistency variable of the target iterative update frequency modulation power supply, and the rapidity of energy storage frequency modulation response is fully utilized so that accurate tracking of the system ACE signal can be realized, the power grid frequency modulation capacity can be enhanced and the system robustness can be enhanced.

The invention relates to the field of wind power, in particular to a wind generating set blade abnormal recognition method. The wind generating set blade abnormal recognition method is used for monitoring the operation state of a wind generating set, operation parameter data of the wind generating set are obtained at first and at least comprise the Y-direction acceleration value, then, abnormal detection data are determined based on the operation parameter data, abnormal detection data sections where the abnormal detection data occur continuously are determined, the total frequency of the abnormal detection data sections is counted, if the total frequency is larger than or equal to the preset abnormal frequency threshold value, it is judged that a wind generating set blade is abnormal, andif not, the blade is not judged to be abnormal. Due to the fact that the performance of the blade is reduced due to cracking and other issues of the blade, the Y-direction acceleration value in the fan operating process can be abnormal, if the abnormal data frequently occur within a certain time continuously, it explains that the blade is abnormal, blade abnormity can be monitored in time when happening, and the blade abnormal recognition timeliness and accuracy are improved.