439 results about "Code book" patented technology

The present invention provides a method for feedback and transmission of multi-user (MU) multiple input multiple output (MIMO) in a wireless communication system. The method includes steps of selecting subset codebook or full code book based on traffic load of a base station, and broadcasting the selected codebook to user equipments. In high traffic load, subset codebook is selected, and in low traffic load, full codebook is selected. User stations calculated a channel quality indicator of a spatial codeword vector that is included in the selected codebook. Information of the maximum channel quality indicator is sent to the base station together with a precoder of the user equipment. The base station selects user equipments based on the information of the maximum channel quality indicator and precoder, and transmits precoder signal and data signal to the user equipments. The present invention also provides a system for the base station that causes the base station to perform the above mentioned operations.

Systems and methods for processing documents are disclosed. Documents received at a data server are transcoded using locally stored or generated code books. Code books for transcoded documents received at a wireless mobile communication device are either retrieved from a memory on the device or requested from a data server. In response to a code book request, a data server retrieves a requested code book from a local memory or generates the requested code book and returns the requested code book to a requestor. A wireless mobile communication device may also generate and transcode XML documents using a locally stored code book, a locally generated code book, or a code book received in response to a code book request.

Disclosed herein is an apparatus and method for separating a foreground and a background. The apparatus includes a background model creation unit for creating a code book including a plurality of code words in order to separate the foreground and the background, and a foreground/background separation unit for separating the foreground and the background using the created code book. The method includes the steps of creating a code book including a plurality of code words in order to separate the foreground and the background, rearranging the cord words of the created code book on the basis of the number of sample data that belong to each of the code words, and separating the foreground and the background using the code book.

An audio encoding apparatus capable of improving the frame cancellation error tolerance, without increasing the number of bits of a fixed code book, in a CELP type audio encoding. In this apparatus, a low frequency component waveform encoding part (210) calculates, based on a quantized LPC received from an LPC encoding part (202), a linear prediction residual signal of a digital audio signal received from an A/D converter (112), then performs a down sampling of the calculation result to extract the low frequency components comprising bands, which are lower than a predetermined frequency, in the audio signal, and then waveform encodes the extracted low frequency components to produce encoded low-frequency component information. Then, the low frequency component waveform encoding part (210) inputs this encoded low-frequency component information to a packetizing part (231), while inputting the quantized low-frequency component waveform encoded signal (sound source waveform), which has been produced by the waveform encoding, to a high frequency component encoding part (220).

The invention provides a generation method of a vector quantization code book. In the method, a global optimization method based on a random relaxation technology is introduced; and while iteratively updating the code book every time, random disturbance is generated and added to a corresponding code word, thus local convergence is effectively avoided during the process of updating the code book. The method can further rationally optimize a code book structure and bit positions of the code word according to the inherent characteristic of channel statistical distribution of a wireless communication system and the requirement on orthogonality of user scheduling in a base station in an MIMO system on the selected users. In addition, a method for expanding the code book is also introduced in order to improve the robustness of the code book in a multi-channel statistical distribution environment, and the size of the code book can be flexibly adjusted according to specific conditions. As the antenna number of the base station and downlink user equipment is greatly increased based on the demand of the development of the future communication system, the method can generate reserved interfaces for the future code book, and can achieve higher quantization and system performance with lower complexity even though the method is used in high-dimensional vector quantization.

A method for transmitting feedback information for cooperative transmission in a wireless communication cellular system comprises: receiving information on cells that can be cooperatively transmitted from a base station; determining cells that prefer the cooperative transmission among the cells that can be cooperatively transmitted; generating feedback information, which includes a preference cell indicator representing preferred cells and non-preferred cells for the cooperative transmission among the cells that can be cooperatively transmitted, precoding matrix information for the respective cell that can be cooperatively transmitted, phase information representing a phase correction value of each of the preferred cells for the cooperative transmission, and a channel quality indicator; and transmitting the feedback information through a control channel or a data channel. Accordingly, the present invention provides a method and apparatus for transmitting and receiving a report of implicative feedback information on code books that can be designed for the gain improvement of a high-level inter-cell cooperative transmission.

The invention relates to a wireless communication field and discloses a communication method based on a multi-input and multi-output system and a device thereof. The invention has robustness to fading conditions of a channel so that an MIMO system can present the relatively satisfying performance at both high speed and low speed. In the invention, according to current channel state, a receiver selects an optimal pre-coding matrix and feeds back information representing the prepared coding matrix to a sender; the sender carries out orthogonal space-time coding for the information which needs to be transmitted and multiples the pre-coding matrix represented by the information which is fed back by the receiver to transmit; the receiver multiples conjugated transposition of the pre-coding matrix used by the sender by the received signal and after the orthogonal space-time coding is carried out, the information which needs to be transmitted by the sender is obtained. Besides, the invention also provides a practical method for designing a pre-coding code book and selecting an optimal code word matrix from the code book.

A post-processor 317 and method substantially for enhancing synthesised speech is disclosed. The post-processor 317 operates on a signal ex(n) derived from an excitation generator 211 typically comprising a fixed code book 203 and an adaptive code book 204, the signal ex(n) being formed from the addition of scaled outputs from the fixed code book 203 and adaptive code book 204. The post-processor operates on ex(n) by adding to it a scaled signal pv(n) derived from the adaptive code book 204. A gain or scale factor p is determined by the speech coefficients input to the excitation generator 211. The combined signal ex(n)+pv(n) is normalised by unit 316 and input to an LPC or speech synthesis filter 208, prior to being input to an audio processing unit 209.

The invention relates to an automatic-adaptive multi-user beam shaping method based on zero defection broadening, which comprises the following steps: a plurality of sets of direction of arrival, i.e. a DOA angle combination is selected, and each set of direction of arrival includes DOA angles of N users; the orthogonalization is carried out after the transmission weights of the N users of each set is carried out by using a zero defection broadening arithmetic to obtain the final transmission weight of each user, the final transmission weights are stored as a codebook, and N is the number of the users reusing the same resource, and is not smaller than 2; when the beam is shaped, the base station receives an uplink signal, and the DOA angle corresponding to the position of each user is estimated; the N users satisfying the restrictive condition of group division are put into one user group; for each user group, the closest DOA angle combination is matched from the DOA angle combination which is previously selected according to the DOA angles of the N users in the user group, and the transmitting weights of the N users corresponding to the DOA angle combination in the code book are used. The automatic-adaptive multi-user beam shaping method enables at least two users to utilize the same time frequency and code resources and reuse system resources.

A wireless communication apparatus of a base station uses antennas for multiple systems, forms a multi-beam, transmits data to a mobile station, and includes a code book configured to store therein beamforming information; a pre-coder that reads the code book and executes a process of forming a given beam for the data; a control unit that, based on feedback information to correct variations in phase occurring at transmitting circuits respectively corresponding to each of the systems, performs control such that the beamforming information to correct the variations in phase is read from the code book; and a phase correcting unit that corrects a phase of the multi-beam formed by the pre-coder, based on the feedback information and such that relations among the phases of the multi-beam become substantially linear.

A system for analyzing and modifying passwords in a manner that provides a user with a strong and usable/memorable password. The user would propose a password that has relevance and can be remembered. The invention would evaluate the password to ascertain its strength. The evaluation is based on a probabilistic password cracking system that is trained on sets of revealed passwords and that can generate password guesses in highest probability order. If the user's proposed password is strong enough, the proposed password is accepted. If the user's proposed password is not strong enough, the system will reject it. If the proposed password is rejected, the system modifies the password and suggests one or more stronger passwords. The modified passwords would have limited modifications to the proposed password. Thus, the user has a tested strong and memorable password.

A machine tool system is diagnosed by identifying a fault class to which an input measurement vector belongs. The fault class corresponds to a group of weight vectors in a code book of a self organized map that describes the machine tool system based on training data. Probabilities that the input measurement vector belongs to a given class are estimated based on the posterior probability of the weight vectors of the code book corresponding to the given class given the input measurement vector. Training data to create the code book may be collected under a first operating condition while the input measurement vector is collected under a second operating condition.

The invention discloses a method for sending uplink control information on basis of physical uplink shared channel (PUSCH) transmission and a system thereof. The PUSCH transmissions adopts a spatial multiplexing mode; and two transmission blocks configured by user equipment all transmit uplink data and perform the channel coding to the uplink data to obtain two code word streams. The method comprises the following steps of: the user equipment jointly codes the rank indication information to be sent and the information of the pre-encoding matrix in a first code book to obtain a joint coding index; and the user equipment repeatedly maps a modulating symbol which is obtained by processing the joint coding index to all transmission layers which correspond to the two code word streams to send.

The invention discloses a method and device for reporting channel state information so as to improve the accuracy and the efficiency of the channel state information. The method comprises the following steps that: a terminal acquires the number of frequency bands included in a system bandwidth range; the terminal determines the frequency range of each frequency band according to the number of frequency bands; the terminal determines wideband element information corresponding to the frequency band according to a channel estimation parameter of the frequency range corresponding to the frequency band aiming at each frequency band; the terminal determines sub-band element information corresponding to a sub-band according to wideband element information of the frequency band to which the sub-band belongs and the channel state information of the sub-band aiming at each sub-band; and the terminal feeds back the channel state information to a base station, wherein the channel state information comprises the sub-band element information of each sub-band or a label of the sub-band element information of each sub-band in a code book. By adopting the technical scheme provided by the invention, the accuracy and the efficiency of the channel state information are improved.

The input signal can be quickly and accurately classified and a descriptor can be generated according to the result of classification. Then, the input signal can be retrieved on the basis of the result of classification or the descriptor. A signal processing apparatus comprises a time block splitting section 3 for splitting an audio signal into blocks that are typically 1 second long, a feature extracting section 4 for extracting a characteristic quantity of 18 degrees on the signal attribute from the audio signal in each block and a vector quantizing section 5 for carrying out an operation of categorical classification for the audio signal of each block by means of a vector quantization technique that uses a VQ code book 8 and a characteristic vector formed from the characteristic quantity of 18 degrees. The vector quantizing section 5 outputs a classification label obtained as a result of the categorical classification and a descriptor indicating the reliability of the label. If a signal retrieving operation is conducted in the downstream, the result of the classification or the descriptor is used for the signal retrieval.

The invention discloses a code book indexing coding method based on classification and permutation combination, including the following steps: counting the pulse required to the need to encode on the track according to the positions, to obtain the number of pulse position, the distribution of the pulse position on the track and the pulse number at each pulse position; determining a first index according to the number of the pulse position, determining a second index according to the distribution of the pulse position on the track, and determining a third index according to the pulse number at each pulse position; and generating a coding index including the first index, the second index and the third index. Using the method proposed by this invention can lower the bit number of the code book indexing at high-bit-rate.

The invention provides a method and a device for selecting a precoding matrix. The characteristics that a gap between adjacent antennae of tightly spaced cross polarization linear array antennae is small, the diagonal elements of a correlation matrix are 1 and the like are fully considered, and a corresponding code book for the quantification and feedback of the correlation matrix is designed, so that high system performance is achieved at low feedback overhead and complexity.

The invention discloses an increment neural network and sub-graph code based image classification method. The increment neural network and sub-graph code based image classification method comprises the following steps of: extracting local characteristics; studying increment code books in a network; performing characteristic coding based on a sub-graph; getting image spaces together; and studying a classifier and predicting a model. The increment neural network and sub-graph code based image classification method greatly reduces time complexity of a traditional algorithm to a great extent as the code book can be studied efficiently, and the space relationship between visual words is also kept; in addition, the characteristic coding based on the sub-graph is specifically for performing characteristic coding by fully utilizing the space relationship between the visual words, so that more abundant semantic information can be extracted, and excellent classification performances are obtained finally while the computational efficiency of a classification system is increased. Therefore, the increment neural network and sub-graph code based image classification method has a relatively high use value.