128results about How to "High gain performance" patented technology

The invention discloses a motion vector forecasting method in a resolution quantizing structure, wherein, forecasting motion vectors of macro blocks in enhancement layers are acquired by utilization of relativity of motion vectors of a time domain, a space domain and an interlayer domain. The realization process is that: on the time domain, candidate motion vectors of the time domain are acquired from motion vectors of macro blocks with the same position with the prior frame; on the space domain, candidate motion vectors of the space domain are acquired from motion vectors of adjacent blocks; on the interlayer domain, candidate motion vectors of the interlayer domain are acquired from corresponding motion vectors with low space domain resolution hierarchy; candidate motion vectors with minimum motion estimation cost are selected to be forecasting motion vectors by selection among the candidate motion vectors of the time domain, the space domain and the interlayer domain. The invention has the advantages of capability of acquiring more accurate forecasting motion vectors, capability of compressing code rate of motion vectors, and obtaining of performance gain.

The embodiment of the invention relates to an orthogonal frequency division multiplexing (OFDM)-transform domain communication system (TDCS) signal transmission method, an OFDM-TDCS signal transmitter, an OFDM-TDCS signal receiving method, an OFDM-TDCS signal receiver, and a system. The signal receiver performs channel estimation and data symbol detection for the first time on each original frame of a received signal, performs a posterior probability (APP) decoding on the extrinsic information of bits of a complete coded data block, and performs iterative channel estimation and data symbol detection by utilizing an extended frame according to a prior probability log ratio of the bits fed back by the APP decoding to obtain an OFDM-TDCS channel estimation result and a data symbol detection result. The embodiment of the invention reduces a mean square error (MSE) of the channel estimation by using an iterative channel estimation technology, has relatively higher anti-multipath performance and relatively higher anti-fading performance, and enables a coded OFDM-TDCS to reliably transmit data at an extremely low signal to noise ratio and under the cognitive radio (CR) condition of discontinuous or inconsistent frequency spectrums used by the transmitter and the receiver.

The invention relates to methods and devices comprising a nanostructure (2;4,4a) for improving the optical behavior of components and apparatuses and/or improving the behavior of sensors by increasing the active surface area. The nanostructure (2) is produced by means of a special RIE etching process, can be modified regarding the composition of the materials thereof, and can be provided with adequate coatings. The amount of material used for the base layer (3) can be reduced by supplying a buffer layer (406). Many applications are disclosed.

The invention discloses an MIMO-OFDM channel estimation method considering same frequency interference. The method comprises the following steps that 1), an observation sample of MIMO-OFDM pilot signals is utilized, an estimation criterion of the least square method is based, and then initial estimation of a channel impulse response is obtained; 2), the initial estimation of the channel impulse response is utilized, a residual error estimation method is based, and then an initial estimation value of an interference covariance matrix is obtained; 3), the initial estimation value of the interference covariance matrix is utilized, Cholesky decomposition and time domain 'low-pass filtering' are based, and then an improved estimation value of the interference covariance matrix is obtained; 4), the improved estimation value of the interference covariance matrix is utilized, a maximum likelihood estimation method is based, and then an improved estimation value of the channel impulse response and an improved estimation value of the channel frequency response are obtained. The MIMO-OFDM channel estimation method considering the same frequency interference is low in computation complexity and good in estimation error performance, and the performance gain is larger as the number of antennas is increased.

The invention discloses a hard decision guided forward and backward estimating method for estimating a synchronization erroneous position and belongs to the field of digital communication error control coding. The method is characterized in that a hard decision estimated sequence output by an outer decoder is introduced into a reverse concatenated code inner decoder; the reference sequence of the inner decoder uses the XOR of a watermark sequence and an interlaced hard decision estimated sequence. The forward and backward estimating method computes output probability by using the reference sequence and an updated valid replacement error probability, and is further used for computing forward measurement value and a backward measurement value, and increases the reliability of the likelihood information of each bit output by the forward and backward estimating method. Compared with a reverse concatenated code conventional decoding method, the forward and backward estimating method is increased in accuracy and acquires higher performance gain with lower extra complexity.

The invention discloses a method and a device for quantizing channel state information. According to the embodiment of the method and the device for quantizing the channel state information, the method that codeword indexes are provided for a base station from a user terminal is provided, the base station is provided with antennas, the number of the antennas is Nt, and the antennas are evenly arranged in a circular array. The method for quantizing the channel state information includes the following steps: according to an estimated wideband channel matrix, the user terminal determines a first codeword in a first codebook on the basis of a first predetermined rule, wherein the sequence of the first codebook is r, the first codeword is a group of beams for estimation of the wideband channel direction, and the r is equal to a positive integer from 1 to Nt; the codeword index of the first codeword is sent to the base station; for each subband, according to an estimated subband channel matrix, the user terminal determines a second codeword in a second codebook on the basis of a second predetermined rule, wherein the sequence of the second codebook is the r, the second codeword is used for describing the subband channel direction and is one wave beam in the first codeword; and then the codeword index of the second codeword is sent to the base station. Through the method and the device for quantizing the channel state information, a quite high system performance gain can be obtained at quite low PMI feedback cost.

The invention provides a method for coordinating interference among cells, base station equipment and a communication system. The communication system comprises a plurality of pieces of base station equipment; the base station equipment is used for determining a user type according to neighbor cell list information reported in real time by a user and distribute corresponding frequency band resources to the user according to the user type and the stored resource information for dividing different frequency band resources for different user types. The invention distributes the frequency band resources in the cells on the basis of correctly distinguishing the user into a cell edge user and a central user so as to reduce the interference of the cell edge user on a neighbor cell as far as possible, thereby optimizing the performance of the edges of the cells.

The invention provides a method, a system, a base station, and a user terminal to distribute an indicated power of a multi-input multi-output control system, wherein, the method comprises the following steps: a power distribution information table which is shared by users and the base station are preset in the system; a power distribution value of each user in the system and an actual down streamrank value which is shared by the base station and the users are acquired; a reference power value which is matched with the power distribution value in the power distribution information table is searched by the base station according to the power distribution value and the actual downstream rank value; a control indicated message which corresponds to the matched reference power value is sent bythe station to the corresponding user; and the corresponding reference power value is acquired through the way of searching in the power distribution table according to the control indicated message and the actual downstream rank value. The invention has the advantage of sending a power indication which is not equally distributed to the each user. Furthermore, compared with a system which equallydistributes the power, the invention gains greater performance gain.

The invention provides a feedback method and device for channel quality indication in a communication system and a communication terminal. The method comprises the steps of determining the variation speed degree of the current channel according to the channel association among different sub-frames; selecting corresponding code rate modifying factors based on the variation speed degree of the current channel; treating the calculated channel capacity and the selected code rate modifying factor as the channel state information to obtain the corresponding channel quality indicator; reporting the obtained channel quality indicator to a base station in the communication system. According to the technical scheme, the method has the advantages that the fed back CQI can be accurately adapted to the actual channel state, so that the performance gain of the system can be increased.

The invention provides a multi-point coordinated transmission method based on limited feedback in a heterogenous network system. The multi-point coordinated transmission method includes that quantitative channels and channel module values are fed back by users of first transmitting nodes; a plurality of users of a plurality of second transmitting modes search and find preset code words, and a feedback information set is generated according to indexes and interference values of the preset code words; weight vectors of downlink transmitting beams of the first nodes are determined by the first transmitting nodes according to shared feedback information, and scheduling users of the first transmitting nodes and scheduling users of the second transmitting nodes are determined; the scheduling users of the second transmitting nodes feed back quantitative channels of the scheduling users to the corresponding second transmitting nodes according to codebooks; and vectors of downlink transmitting beams are determined by the second transmitting nodes according to the quantitative channels, so that the first transmitting nodes and the second transmitting nodes simultaneously transmit downlink data via the respective beams. According to an embodiment of the invention, the feedback efficiency of the heterogenous network system is effectively improved, system overhead is reduced, and fine system performances are realized.

The invention discloses a data broadcast ARQ method based on maximum-minimum network encoding. The method comprises the following steps: base stations broadcasting data packets; users decoding the data packets and feeding the correct decoding conditions of the data packets to the base station; the base stations performing maximum-minimum network encoding on lost original information to generate network encoding data packets and retransmitting the network encoding data packets, and the users feeding data packet conditions recovered at a retransmission stage back to the base stations; and repeating step 3) until all the users receive all the data packets correctly. The number of the network encoding packets formed by use of the maximum-minimum network encoding method provided by the invention is equal to the number of the lost data packets of the users losing the largest number of the data packets. Therefore, the maximum-minimum network encoding method can preferentially guarantee that the users losing the largest number of the data packets can obtain maximum network encoding gains. The method provided by the invention has the advantages of small average retransmission frequency, high broadcast efficiency and the like, thereby being able to be well applied to a wireless data broadcast scene.

The disclosed MBMS system with UTN in TD-SCDMA comprises: a wireless network controller, which sends UTN configuration message to UE to configure a UTN code for every time slot and the SCCPCH for node, and configures UTN code for node; a node B building SCCPCH channel with last controller and interfering the MBMS data to transmit; and UE receiving MBMS data according to the received UTN message. This invention avoids same frequency interference of near subzones.

The invention discloses a relay selecting method based on a social characteristic in a D2D relay network. The method comprises the steps of acquiring position information and a relay selection range radius lmax of an idle user, and obtaining an idle user set in the relay selection range according to the position information and the relay selection range radius lmax of the idle user; when the communication time of a system is longer than or equal with a preset value, calculating an information transmission rate of each idle user in the idle user set according to a social relation strength, a credit value and a position relation of each idle user in the idle user set, and selecting the idle user with highest information transmission rate as a relay; and when the communication time of the system is lower than the preset value, calculating a product between a cooperation probability and an information transmission rate of each idle user in the idle user set according to the social relation strength, the credit value and the position relation in the idle user set, and selecting the idle user with highest product as the relay. The relay selecting method can realizes a fact that relay selection more accords with a true application scene.

The invention relates to a method, a device and a system for realizing the transmission of multicast broadcast service data. The method comprises the following steps: selecting an optimal wave beam mode by training protocol; adopting a wave beam forming technique without time diversity or with time diversity carried to transmit the multicast broadcast service data. Therefore, the transmission of the multicast broadcast service data is realized simply and fast, and performance gain of the base station can be increased and the coverage area of the base station can be improved.

An optical orthogonal frequency division multiplexing modulation method based on deep learning provided by the invention comprises a signal transmitting process and a signal receiving process, and comprises the following steps: training and constructing an automatic encoder with a neural network structure, including an automatic encoder transmitting end and an automatic encoder receiving end; inputting a to-be-sent signal into the transmitting end of the automatic encoder for signal preprocessing to obtain a preprocessed signal; performing OFDM modulation on the preprocessed signal to obtain apositive real signal, and transmitting the positive real signal through a VLC channel; enabling the signal receiving end to receive the modulation signal through a VLC channel and performing OFDM demodulation to obtain an OFDM demodulation signal; inputting the OFDM demodulation signal into the receiving end of the automatic encoder for demodulation, and restoring the to-be-sent signal. Accordingto the invention, by constructing the automatic encoder with the neural network structure, high system performance gain is obtained with low complexity while positive real number limitation of a VLCsystem is met, and the signal peak-to-average power ratio PAPR is greatly reduced.

The invention discloses a full diversity multi-antenna two-way relay receiving method based on combination of a Dempster-Shafer evidence theory and a physical-layer network coding. Firstly, a multi-antenna two-way relay model without direct link is built; then, performance and defects of the prior multi-antenna two-way relay receiving algorithm based on a decode-and-forward network coding and the physical-layer network coding are analyzed, moreover, according to the defects of the prior algorithm, the full diversity multi-antenna two-way relay receiving method based on combination of the Dempster-Shafer evidence theory and the physical-layer network coding is provided. According to the invention, uncertainty generated by fading channels and noise is described through a basic probability assignment function, then, the uncertainty of received signals is reduced at a receiving end through a Dempster's rule, and finally, reliable transmission signals are obtained through a maximum judgement rule. As compared with the prior sub-optimal algorithm, the method provided by the invention improves bit error rate performance of a relay receiving end well, and simultaneously achieves full diversity gain at the receiving end. Finally, the provided algorithm is subjected to simulation verification, and the result of simulation verification is consistent with theoretical analysis.

The present invention relates to a method of performing time drift compensation in a receiver (200) and a receiver (200) for performing time drift compensation. The basic idea of the invention is that a signal is received at the receiver. A control pulse is produced after a certain number of chips of the received signal has been received. A variable delay that is applied to the received signal is controlled by means of the control pulse. The resulting delayed signal is supplied to demodulation units (202, 203) in the receiver, in which delayed signal chips have been omitted or duplicated. A compensation signal is supplied to the demodulation units in the receiver, and this compensation signal indicates whether chips have been omitted or duplicated in the delayed signal. Finally, the delayed signal is demodulated such that the demodulation units consider the omission or duplication of chips in the delayed signal.

The invention discloses a multi-antenna two-way relay evidence theory receiving method based on decode-and-forward network coding. The method comprises the following steps: firstly, building a multi-antenna two-way relay model not including a direct link; and then, analyzing performance and defects of an existing multi-antenna two-way relay receiving algorithm based on the decode-and-forward network coding, and providing the multi-antenna two-way relay evidence theory receiving method based on the decode-and-forward network coding according to the defects of the existing algorithm. The method is characterized in that initial decision statistics of a received signal are acquired through a conventional multi-antenna detection method firstly; then, uncertainties generated by a fading channel and noise in the decision statistics of the received signal are described through a basic belief assignment function; the uncertainties of the decision statistics of the received signal are lowered through an evidence theory combining rule; and lastly, a reliable transmission signal is obtained through a maximum value decision criterion. Compared with an existing sub-optimal algorithm, the method has the advantages that the bit error rate performance of a relay receiving end is improved well. Lastly, simulation verification is performed on the algorithm, and a result which is consistent with theoretical analysis is obtained.

The invention discloses a method and device for configuring a channel quality indication reporting mode. The method comprises the steps that whether user equipment is target user equipment or not is judged; if yes, the operation that an aperiodic channel quality indication report is reported by the user equipment is configured, and a time cycle that the user equipment is triggered to report the aperiodic channel quality indication report is configured; if not, the operation that the user equipment reports a periodical channel quality indication report is configured. According to the method and device for configuring the channel quality indication reporting mode, periodization of aperiodic channel quality indication reporting of the target user equipment is realized, as a result, a better frequency selectivity dispatching result can be obtained, the advantages of frequency selectivity dispatching can be fully explored, and performance gain of system performance is improved. Meanwhile, the aperiodic channel quality indication report is configured for only the target user equipment instead of all user equipment, and therefore the resource expenditure caused by aperiodic channel quality indication reporting can be reduced.

An embodiment of the invention discloses a method for determining a logarithm likelihood ratio, a Turbo encoding method and a device thereof and is applicable to multiple-input and multiple-output systems. The method for determining the logarithm likelihood ratio includes adaptively selecting nodes for received signals, and determining survival paths of transmitted signals and measurement values corresponding to the survival paths; dividing the measurement values into a first set and a second set; respectively iteratively computing the measurement values in the first set and the measurement values in the second set to obtain first approximation probability of the first set and second approximation probability of the second set; and computing the difference of the first approximation probability and the second approximation probability to obtain the logarithm likelihood ratio of the transmitted signals. The method for determining the logarithm likelihood ratio, the Turbo encoding method and the device thereof solve technical problems of low computation accuracy of logarithm likelihood ratio of transmitted signals and incorrectness of encoding in the prior art.