194results about How to "Good orthogonality" patented technology

Neighbor cell hearability can be improved by including an additional reference signal that can be detected at a low sensitivity and a low signal-to-noise ratio, by introducing non-unity frequency reuse for the signals used for a time difference of arrival (TDOA) measurement, e.g., orthogonality of signals transmitted from the serving cell sites and the various neighbor cell sites. The new reference signal, called the TDOA-RS, is proposed to improve the hearability of neighbor cells in a cellular network that deploys 3GPP EU-TRAN (LTE) system, and the TDOA-RS can be transmitted in any resource blocks (RB) for POSCH and/or MBSFN subframe, regardless of whether the latter is on a carrier supporting both PMCH and POSCH or not. Besides the additional TDOA-RS reference signal, an additional synchronization signal (TDOA-sync) may also be included to improve the hearability of neighbor cells.

The invention discloses a method for eliminating sounding reference signal (SRS) interference between different cell users in multi-point coordination, which comprises the following steps of: configuring same virtual cell identifier for user equipment (UE) performing multi-point coordinated transmission in the same multi-point coordinated transmission cell, and informing the UE performing the multi-point coordinated transmission in various cells of the virtual cell identifier; and generating sounding reference signals (SRS) by using the UE performing the multi-point coordinated transmission on the basis of the virtual cell identifier and sending to the network side. In the technical scheme, SRS sequences of the UE in different cells of the same CoMP set are generated on the basis of the same virtual cell identifier (ID), so the generated SRS sequences of the UE have good orthogonality, bearing positions are not limited when the SRS resources are configured for the cells in the CoMP set, different cyclic shifts are only configured for the SRS sequences of different UE in the CoMP cells occupying the same time frequency resource, and the interference between the SRS can be eliminated.

A network element may provide a plurality of user equipments with a dedicated pilot sequence for uplink reference signal transmission. A user equipment may, after receipt of a dedicated pilot sequence, spread the pilot sequences using a block spreading method.

The invention relates to a method, a computer program product and a device for evaluating a code which is orthogonal to one or more further codes. The method comprises the steps of receiving a signal which carries a code containing a sequence of code symbols, determining for a particular symbol instant at least one channel estimate, determining for the particular symbol instant a compensation value taking into account the at least one channel estimate, compensating each code symbol using the compensation value determined for the corresponding symbol instant, wherein the compensation is performed such that an original power relationship among the individual code symbols contained in the code is restored, and evaluating the code on the basis of the sequence of compensated code symbols exploiting the orthogonality to further codes.

The invention provides a sounding reference signal transmission method, network side equipment and user equipment, and belongs to the field of communication. The sounding reference signal transmission method used for the network side equipment comprises the steps that parameter configuration information of the user equipment UE used for transmitting SRS is determined; and the determined parameter configuration information is indicated to the UE so that the UE is enabled to use the unused DMRS resources to transmit the SRS according to the parameter configuration information. According to the technical scheme, the influence on the DMRS can be reduced as much as possible when the unused DMRS are reused for SRS transmission so that the multiplexing capacity can be enhanced and the great orthogonal performance can be maintained.

The present invention relates to a method for generating a reference signal, including: obtaining first control information, where the first control information indicates or includes cyclic shift related information which is used by a terminal belonging to a serving cell to send a reference signal; and sending the first control information to the terminal belonging to the serving cell, so that the terminal belonging to the serving cell generates the reference signal according to the cyclic shift related information which is indicated or included by the first control information and used by the terminal to send the reference signal, where a variation rule of a cyclic shift which the terminal belonging to the serving cell uses to generate the reference signal is the same as that of a cyclic shift which a terminal belonging to a coordinated cell uses to generate the reference signal.

The embodiment of the invention discloses a multi-carrier aggregation system and a method thereof for selecting uplink reference signals. The method comprises the step that UE (User Equipment) on each downlink member carrier in the same cell selects uplink reference signals in the same uplink reference signal sequence set. The system comprises the UE and a base station, wherein UE on each downlink member carrier in the same cell selects the uplink reference signals in the same uplink reference signal sequence set and transmits the signals to the base station; the base station receives the uplink reference signals transmitted by the UE and performs channel estimation according to the received uplink reference signal. The invention can improve the accuracy of channel estimation which is performed by the base station according to the uplink reference signals transmitted by the UE.

The invention provides a combinable frequency hopping wireless transmitting-receiving system and an operation method thereof. The system comprises a transmitter and receiver. The transmitter comprises a data interface, a frequency hopping framing device, a transmitter differential frequency hopping module, a transmitter conventional frequency hopping module, a D/A converter and a front emission circuit which are connected in order. The receiver comprises a front receiving circuit, an A/D converter, a receiver conventional frequency hopping module, a receiver differential frequency hopping module, a frequency hopping decoding frame device and a data interface which are connected in order. According to the operation method of the system, a whole work frequency range is divided into M sub frequency ranges with an equal bandwidth, change of conventional frequency hopping is carried out between each segment of frequency band, and change of differential frequency hopping is carried out in a segment. Through conventional frequency hopping, differential frequency hopping and real-time full frequency range frequency hopping, the transmitter generates a frequency hopping signal to be sent. A receiving end completes de-hopping of a received signal according to an opposite sequence, and restores data information. In the invention, two kinds of frequency hopping are employed, two advantages are fully utilized, randomness, anti-interference and anti-investigation capability of the system are raised, and frequency hopping communication performance is effectively raised.

The present invention relating to the mobile communication filed discloses a transmitting method and system in the universal mobile communication system to improve the multipath interference resisting ability of the MIMO downlink physics channel on the premise of having the compatibility of UMTS system. In the present invention, each branch signals of the MIMO downlink physics channel at the network side compose the single-carrier symbols with cyclic prefix; then the symbols are sent to the UE side through the emitting antennas corresponding to the branches after being combined with the signals of other physics channel; UE processes the signals of the downlink physics channel using MIMO that has been received by the antenna in a frequency domain multi-user detecting mode, while a common CDMA receiving method is retained to other downlink physics channel.

The invention provides a stope face impact risk pre-mining pre-evaluation method. Evaluation is conducted by arranging a certain number of focuses and detectors in an open-off cut or an air return way or a transportation roadway of a stope face which is pre-estimated before mining and utilizing an earthquake CT detection technology. The stope face impact risk pre-mining pre-evaluation method includes the steps that the longitudinal wave velocities vz, vl and v0 of earthquake waves in an immediate roof, an upper roof and a coal bed of the stope face are determined; the thickness hz of the immediate roof of the stope face and the distance h0 from the focuses to the bottom surface of the immediate roof are determined; the allowed minimum value xzl of the focus inspection distance is calculated; a detection zone rock stratum dynamic failure comprehensive probability index two-dimensional distribution diagram is obtained, and rock stratum dynamic failure dangerous zones and levels of the dangerous zones in a detection zone are determined; roadway impact dangerous zones of the stope face and the levels of the roadway impact dangerous zones are determined. According to the stope face impact risk pre-mining pre-evaluation method, the influence of interference waves can be effectively eliminated, pre-estimation accuracy is improved, working efficiency is improved, resources are saved, and actual risk relieving work can be more conveniently guided.

The invention relates to a method for identifying the flow type of soft grain two-phase turbulence based on artificial intelligence, comprising the following steps: 1), collecting the pressure signals of the soft grain two-phase turbulence; 2), extracting and analyzing the pressure signal characteristics: carrying out multi-level division on a frequency band by using a small wave packet method, further decomposing a high-frequency part without dispersed multiple resolution ratios, adaptively selecting corresponding frequency bands according to the characteristics of the analyzed signals so as to match the corresponding frequency bands with signal frequency spectrums; and 3), training and identifying flow type samples composed of defined characteristic parameters by using a probabilistic neural network, wherein learning samples are characteristic vectors of information entropy of a small wave packet after normalization according to a relationship between a probabilistic neural network structure and the learning samples, determining the structure of the probabilistic neural network for flow type identification as well as carrying out relative set on the network and learning training, and identifying the samples with different flow types by using the probabilistic neural network. The method has high veracity, good applicability and high reliability, and can effectively meet on-line identification requirements.

A method for placement of a object such as a substrate or a mask on a table, said method including:

• • a first placement step in which the object is placed on a first position on the table;
  • a measuring step in which a displacement between the first position of the object and the required position of the object is determined;
  • a removing step in which the object is released and removed from the table;
  • a moving step in which the object and the table are moved relatively to each other by substantially the said displacement, in a direction substantially parallel to the surface of the table; and
  • a second placement step in which the object is placed at the required position on the table.

The invention provides an HHT end effect restraining method based on data/extreme value joint symmetric prolongation.The method comprises the following steps that firstly, original signals are subjected to end data symmetric prolongation; secondly, extreme points are subjected to symmetric prolongation; thirdly, envelope lines of signals obtained after joint prolongation are obtained; fourthly, EMD is carried out, and IMF components within an original signal time-domain range are intercepted; fifthly, the IMF components including a prolongation part are subjected to Hilbert transformation, and instant frequency within the original signal time-domain range is intercepted.The problem of inherent end swings in EMD and the problem of end divergence in the Hilbert transformation process are solved.

The invention relates to a low signal to noise ratio voice endpoint detection method based on a time-frequency instantaneous energy spectrum. A traditional method used for reducing noise is not ideal in noise-reducing effect. The detection method comprises that noise-contained voice is resolved firstly and reconstructs a low frequency component which is resolved, by regarding the time-frequency instantaneous energy spectrum as a basis of the endpoint detection. After being reconstructed, the signal is dealt by an empirical mode decomposition and the screening and rejecting of an intrinsic mode function are carried out in order to gain an effective international monetary fund (IMF) component by applying a correlation coefficient threshold value principle. The IMF component gained through reconstruction undergoes a Hilbert transformation and a corresponding instantaneous energy spectrum is calculated to form a feature vector of voice endpoint detection. The result is dealt with the subframe. A former five frames instantaneous energy spectrum mean value is regarded as the instantaneous energy spectrum of the noise and a start-stop dual threshold method is adopted to detect the endpoint of the noise. The detection method has the advantages of improving the noise-contained time-frequency resolving power and improving the efficiency of the voice endpoint detection.

A misrecognition determination device is provided. The misrecognition determination device may be configured such that a plurality of traveling parameters that is used for driving control of a vehicle and is based on input data is calculated, a difference between each two of the plurality of traveling parameters is calculated, a weighting coefficient is calculated according to an orthogonality between each two pieces of input data in a traveling situation of the vehicle, and a determination is made whether misrecognition has occurred in a parameter group, which includes the plurality of traveling parameters, using the values each generated by multiplying the difference by the weighting coefficient.

The invention discloses a quadrangle segmentation method applied to finite element analysis. Division of quadrangle grids is achieved in all kinds of mainstream software. The method comprises steps of firstly changing multiple connected polygons into single connection; then, reducing the number of boundary fixed points and extracting geometrical characteristics of boundaries in a boundary simplifying process; decomposing original polygons into relatively simple geometrical shapes, thereby facilitating topology generation and mapped polygons; carrying out topology generation, and using a fixed topology mode to match different sub polygons so as to finish construction of a topology structure; and finally, using an ultralimit interpolation mapping method to obtain a finally grid. According to the invention, a high quality quadrangle grid segmentation method is provided; the generated quadrangle grids have few singular points, good smoothness, uniformity and orthogonality, and can be directly applied to infinite element analysis, simulation and solving.

In a transmitter of a wireless communications system having M transmit antennas (10), each transmit antenna is supplied with a respective combined signal comprising a respective one of M groups each of N data sub-streams, orthogonally spread by N Walsh code sequences (W1 to WN). The N orthogonal code sequences used for each of the M groups comprise a respective one of M different combinations of N from N_w orthogonal code sequences, where N_w>N. M and N are integers greater than one. The combined signals can also include orthogonally spread pilot signals (WP) for channel estimation at a receiver. Orthogonality of the signals transmitted from the transmit antennas is increased, so that transmit signal power can be decreased and/or the receiver can have fewer than M receive antennas.

The invention discloses a multi-sending-multi-receiving interference synthetic aperture radar space-time two-dimension signal waveform designing method which mainly solves the problem that in the prior art, waveform orthogonality is poor, and sending signal pulse repetition frequency is high. The implementation steps of the method are that 1. Doppler center frequency shift delta f i j needed by waveform design is computed; 2. according to the Doppler center frequency shift delta f i j, waveform modulation oblique view angle beta i j is computed; 3. the modulation oblique view angle beta i j is subjected to non-redundancy processing through the Doppler center frequency shift consistency of the sending-receiving combination Ai-Aj and Aj-Ai; 4. according to the non-redundancy modulation oblique view angle number, the sending pulse of an array element Ai is subjected to sub-pulse dividing, modulation oblique view angles are distributed to sub pulses; and 5. the sending sub pulses of array elements are subjected to modulation respectively through the modulation oblique view angles, and a radar waveform signal si(t) is obtained. According to the method, pulse repetition frequency is effectively lowered, waveform orthogonality is improved, larger surveying and mapping band width is obtained, and the method can be used for multi-sending-multi-receiving interference synthetic aperture radar imaging.