481 results about "Signal design" patented technology

A method of communicating between at least two mobile devices in which the method comprises the steps of obtaining an invitation code and transforming the invitation code into a sound wave signal designed to be transmitted by a mobile device. After the invitation code is transformed into the sound wave signal, the sound wave signal is transmitted from a speaker of the mobile device. Additional mobile devices may receive the sound wave signal, resulting in a connection state between the devices.

A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling.

Systems and method are specified to improve the reception of UL transmission, for example in power or coverage limited situations. A WTRU may modify procedures to increase the available signal energy for reception at an eNB and / or to make more efficient use of the available signal energy at the receiver for processing UL transmissions. Example methods for increasing UL link coverage may include modifying HARQ timing (e.g., shorter HARQ), using longer TTIs, use of dedicated PUSCH allocations, use of new PUSCH modulations, enhanced reference signal design, UL macro diversity reception for PUSCH, utilizing protocol reduction techniques, ensuring in-order packet delivery, and / or utilizing a configuration for coverage limited / power limited modes of operation. The proposed methods may be applied individually or in any combination.

Methods, systems, and devices for wireless communication are described. In one example, phase-noise compensation tracking signals (PTRS) may be transmitted using sets of resource blocks (RBs), where a frequency for each PTRS within the sets RBs is different from a frequency corresponding to a direct current (DC) tone. In another example, a time-domain-based PTRS may be used, where a discrete Fourier transform (DFT)-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) symbol may include a cyclic prefix and a PTRS inserted in the DFT-s-OFDM symbol. Additionally or alternatively, a guard-interval-based DFT-s-OFDM symbol may include a PTRS that replaces part or all of a guard interval. In some examples, subsets of tones used for PTRS across a system bandwidth may be transmitted using a scrambled modulation symbol, where at least one antenna port may be used for the transmission of PTRS.

A scheme for multi-frequency at-speed logic Built-In Self Test (BIST) is provided. This scheme allows at-speed testing of very high frequency integrated circuits controlled by a clock signal generated externally or on-chip. The scheme is also applicable to testing of circuits with multiple clock domains which can be either the same frequency or different frequency. Scanable memory elements of the digital circuit are connected to define plurality of scan chains. The loading and unloading of scan chains is separated from the at-speed testing of the logic between the respective domains and may be done at a faster or slower frequency than the at-speed testing. The BIST controller, Pseudo-Random Pattern Generator (PRPG) and Multi-input Signature Register (MISR) work at slower frequency than the fastest clock domain. After loading of a new test pattern, a clock suppression circuit allows a scan enable signal to propagate for more that one clock cycle before multiple capture clock is applied. This feature relaxes the speed and skew constraints on scan enable signal design. Only the capture cycle is performed at the corresponding system timing. A programmable capture window makes it possible to test every intra- and inter-domain at-speed without the negative impact of clock skew between clock domains.

Techniques to determine the position of a terminal under the coverage of a repeater in a wireless communication system. In an aspect, an identification code is transmitted for each repeater and used by the terminal (or a PDE) to unambiguously identify the repeater. The identification codes for the repeaters in the system can be implemented with PN sequences at defined offsets that are specifically reserved for repeater identification. In another aspect, the identification code for each repeater is transmitted using a spread-spectrum signal designed to have minimal impact on the performance of the system and to be recoverable by the terminal in similar manner as for a forward modulated signal. In this way, no additional hardware is required for the terminal to recover the identifier signal. In one specific design, the spread spectrum identifier signal is generated in accordance with and conforms to the IS-95 CDMA standard.

A method and apparatus for designing a Reference Signal (RS) used by a User Equipment (UE) to obtain respective channel estimates for demodulating respective Physical Downlink Control CHannels (PDCCHs), for determining at a UE a number of resource blocks to include for a reception of a Physical Downlink Shared CHannel (PDSCH), for determining at a UE a RS antenna port in order to enable spatial multiplexing of Enhanced PDCCH (EPDCCH) transmissions to different UEs, and for supporting Quadrature Amplitude Modulation 16 (QAM16) modulation, in addition to Quadrature Phase Shift Keying (QPSK) modulation, for EPDCCH transmissions without increasing a number of decoding operations at a UE are provided.

A method is taught for increasing the steady-state verification speed of analog and mixed signal design through increased simulation speed, model abstraction by probing an existing component model or actual device and formal comparison of distinct component models.The innovative method taught here incrementally generates processor instructions optimized for operating the analog solver around a specific set of values (the operating context), caches sequences and applies the currently applicable operating context at each point in the simulation.The invention discloses a method for semi-automatically generating a mixed-signal or analog model based on iterative probing of an existing device or behavioral simulation.The invention teaches a method for model abstraction to alter the level of detail present in a running simulation. A means for graphically evaluating the match quality constitutes the final innovative step.The innovative method for the formal comparison of two analog or mixed signal models within a prescribed operating range for each interface between the model and its environment without the need for exhaustive simulation.

The invention discloses a method for recognizing a gesture based on an acceleration sensor. The method for recognizing the gesture based on the acceleration sensor comprises the steps that firstly, signals of the three-axis acceleration sensor is collected, a smooth denoising filter is designed and used for preprocessing the signals, and detection of the boundary of a gesture signal is automatically achieved; with the combination of a non-gesture filtering strategy, non-gesture data are filtered out before template matching; by the adoption of dynamic planning and a DTW algorithm, matching calculation is conducted on gesture data to be recognized and stored template data, and therefore a template gesture which is the most similar to the gesture to be recognized is found; through the strategies such as curve path limitation conducted by a slope, path area limitation and setting of a distorted threshold value, the template matching calculation amount is reduced, and the recognizing cost is reduced; through the template self-adaption strategy, a sample template base is updated automatically, and the gesture recognizing accuracy is improved. According to the method for recognizing the gesture based on the acceleration sensor, on the premise that energy consumption of a terminal is not obviously increased, better user experience is provided through high recognition efficiency and high recognition accuracy, and freer man-machine interaction is facilitated.

A computer method and apparatus of online automated model identification of multivariable processes is disclosed. The method and apparatus carries out automatically all the four basic steps of industrial process identification: 1) identification test signal design and generation, 2) identification plant test, 3) model identification and 4) model validation. During the automated plant test, process models will be automatically generated at a given time interval, for example, every hour, or on demand; the ongoing test can be automatically adjusted to meet the process constraints and to improve the data quality. Plant test can be in open loop operation, closed-loop operations or partly open loop and partly closed-loop. In a (partial) closed-loop plant test, any type of controller can be used which include proportional-integral-derivative (PID) controllers and any industrial model predictive controller (MPC). The obtained process models can be used as the model in advanced process controllers such as model predictive control (MPC) and linear robust control; they can also be used as inferential models or soft sensors in prediction product qualities. The apparatus can be used in new MPC controller commissioning as well as in MPC controller maintenance.

The invention concerns a multicarrier signal designed to be transmitted to digital receivers, especially in a non-stationary transmission channel, corresponding to the frequency multiplexing of several elementary carriers each corresponding to a series of symbols, two consecutive symbols being separated by a symbol time τ0, a signal in which, firstly, the spacing ν0 between two neighboring carriers is equal to half of the reverse of the symbol time τ0 and, secondly, each carrier undergoes an operation of filtering for the shaping of its spectrum having a bandwidth strictly greater than twice said spacing between carriers ν0 and is spectrum is chosen so that each symbol element is highly concentrated in the temporal domain and in the frequency domain.The invention also concerns the methods for the transmission and reception of such a signal.

The embodiment of the invention discloses an SRS (sounding reference signal) sending method, which relates to the technical field of wireless communication, and is designed for simplifying the signaling design of a communication system. The SRS sending method comprises the following steps: receiving control signaling from a base station, wherein a first field in the control signaling is used for indicating the operation of data transmission or SRS sending, a second field is used for indicating a frequency hopping mode used for data transmission or SRS sending, and a third field is used for indicating frequency band information during the process of transmitting data or SRS sending; according to the first field in the control signaling, determining whether the control signaling indicates an operation of SRS sending or data transmission; when the first field in the control signaling indicates an operation of SRS sending, according to the frequency band information indicated by the third field in the control signaling, sending a SRS in the frequency hopping mode indicated by the second field in the control signaling. The embodiment of the invention also provides an SRS receiving method corresponding to the SRS sending method, a base station and user equipment. The methods, base station and user equipment disclosed by the embodiment of the invention are used for SRS sending.

A missile or other weapons countermeasure system includes a non-directional, modulated laser energy signal designed to protect an object (such as an aircraft, land vehicle, building, or vessel). Once a potential threat has been detected, a laser energy source generates a laser energy signal of sufficient power to provide the necessary coverage. The laser energy is modulated using an oscillator to create the appropriate countermeasure signal. Next, fiber optics or other coupling device distribute the modulated laser energy signal to one or more apertures, preferably wide angle lenses or the like, disposed about the outer surface of the object to be protected. The number and location of the apertures will depend upon the circumstances of the installation as well as the desired coverage.

A method is provided for transmitting a multi-carrier signal formed of a temporal succession of symbols comprised of a set of data elements. The method includes: calculating an interference affecting a set of at least two data elements which are to be protected and are spaced out two by two from no more than one time carrier and no more than one frequency carrier, the interference taking into account the value of the data elements to be protected and values of the data elements of a contour ring consisting of carriers immediately adjacent to data elements to be protected, and; determining at least one value to be attributed to at least one data element of the contour ring for reducing, upon reception, the calculated interference.

A network-based localization method is proposed. In a wireless communication system, based on network positioning, first a serving BS allocates radio resources to a target UE. Then the target UE transmits the PRS to the serving BS and multiple cooperating BSs at the same time. Then, all cooperative BSs perform PRS detection and TOA measurement. Finally, the serving BS performs location estimation based on the TOA measurements. In a novel aspect, only one PRS transmission is required in a positioning opportunity for a positioning result. Candidate PRSs are allocated in the PRS resource area, and PRSs are selected according to different conditions. In the PRS resource area, multiple positioning opportunities and multiple reference signals can be multiplexed in time domain, frequency domain or code domain. In one embodiment, the PRS is configured such that both radio resource consumption and interference are minimized.

The invention discloses a directional modulation signal design method based on a reverse antenna array. According to the method, the reverse antenna array is adopted to enable an incident wave phase position to conjugate and enable a digital phase shifter to construct a directional modulation signal planisphere codebook, and an expected directional modulation signal is synthesized in any spatial direction; according to the invention, a directional modulation signal transmitter and two common digital signal receivers in different spatial directions are included; the spatial direction where the legal user receiver is positioned is the expected direction, and the spatial direction where the eavesdropping receiver is positioned is the unexpected direction. A legal user can normally demodulate a received signal by utilizing the directional modulation signal transmitted through the method; however, the eavesdropping receiver cannot demodulate useful communication information even if receives signal energy similar to that of the legal user due to the dynamic distortion of a received signal planisphere. Therefore, the transmitted directional modulation signal provides a secure transmission method for wireless transmission of communication information.

A method and system are provided for determining modulation control information and a reference signal design to be used by a transmitter node when generating a transmit signal to transmit from a transmitter (logical antenna) of the transmitter node over a channel of a wireless link to a recipient node. The modulation control information is used by the transmitter node to convert source data into an information bearing signal, and the information bearing signal is combined with a reference signal conforming to the reference signal design in order to produce the transmit signal. The method comprises (a) selecting a candidate reference signal design from a plurality of candidate reference signal designs, (b) determining channel state information for the channel, (c) determining, from the channel state information, signal to noise ratio information for said channel, and (d) for each of a plurality of candidate modulation control information, using the signal to noise ratio information to determine a quality indication for said channel. Steps (a) to (d) are then repeated for each candidate reference signal design in said plurality. Thereafter a winning quality indication is selected from the determined quality indications, and the combination of candidate reference signal design and candidate modulation control information associated with the winning quality indication is then output to the transmitting node. By such an approach, quality indications can be established for each combination of possible reference signal design and possible modulation control information, and hence not only is the inherent channel estimation accuracy achievable using each possible reference signal design considered, but also the data transmission efficiency and robustness to channel effects of each possible modulation control information is also taken into account.

The invention provides a multisystem signal simulation device comprising a baseband signal generation module and a signal conditioning module. The baseband signal generation module comprises two parts of a digital circuit and an analog circuit. The analog circuit part comprises an analog clock circuit and a digital-to-analog conversion circuit. The digital circuit part comprises a clock management module, a data generation module, a digital modulation module, an FIR formation filtering module, a CIC interpolation module and an amplitude and phase calibration module. The signal conditioning module comprises an orthogonal modulation module, a broadband frequency conversion module, an amplitude control module and an amplification attenuation module. A baseband orthogonal modulation signal is realized in the internal part of an FPGA so that degree of complexity of the baseband signal design in the FPGA can be reduced, the requirement for DAC sampling rate and data width can be reduced and high-index output of a carrier modulation signal can be realized. A radio frequency PIN amplitude control technology is adopted so that small step and high dynamic range of signal amplitude can be realized.

A mobile communication system uses a multiple-input-multiple-output (MIMO) technology with an orthogonal frequency division multiplexing access (OFDMA) scheme. Multiuser diversity, multiantenna diversity, and power control since the first ranging attempt are exploited in the initial ranging process. At network entry, an initial ranging method selects from multiple ranging signal designs to accomplish the initial ranging process. In one embodiment, three classes of ranging signal designs may be selected for use in generating ranging codes. The information on the ranging signal design to be used, which is selected by the base station based on the cell size of the communication system (i.e., the radio coverage area of the base station), is broadcast from the BS. The ranging signal designs are directly applicable to single-antenna systems, and they are applied to MIMO systems by using appropriate mapping across transmit antennas based on the adopted MIMO ranging transmission scheme. In a mobile communication system using MIMO technology with the OFDMA scheme, the ranging user selects from multiple ranging transmission schemes of different levels of computation complexity, power consumption and performance. In one example, optimum eigenmode and suboptimum eigenmode transmission schemes provide the best performance at high computational complexity and high power consumption. A simpler single-antenna selection transmission scheme provides significantly reduces computational complexity and achieves power saving at a marginal degradation in system performance.

A series of processes is allocated to functional blocks arranged in electronic control units (ECUs) of a vehicle control system, and each functional block executes the process and outputs a signal. The first functional block receiving a value from a sensor outputs a signal including a check code of a starting state and a result of the process. Each of the other functional blocks produces a signal including a result of the process and a renewed check code based on a signal delivered by the preceding functional block. The last functional block outputs a signal to controls an actuator. A sequence check functional block of one ECU checks the deliveries of the signals designed to be performed in a predetermined order according to the renewed check code and performs error correction processing when the deliveries are performed out of the predetermined order.

The invention belongs to the field of computer figures, and provides a modeling structure of a GPU texture mapping non-blocking memory Cache. The modeling structure comprises a texture Cache storage status and control unit (1), a missing information status handling register memory cell (MSHR) (2), a multi-request combination and collision detection unit (3), and a texture memory Cache core unit (4). Hardware modeling with accurate periods is conducted on a texture memory Cache access process, parallel processing of texture access request data is realized through a multi-process mode including input request collision detection, request combination and division, multiple ports, multiple Banks and non-blocking flowing, and large-scale parallelism and high throughput demands of texture access data are met effectively. Moreover, the modeling structure effectively avoids configuration of complex circuit signal design and rapid assessment large-scale hardware system, is suitable for system level design and development of circuits in an early age, and provides effective reference for products and functions of the same kind.

A missile or other weapons countermeasure system includes a non-directional, modulated laser energy signal designed to protect an object (such as an aircraft, land vehicle, building, or vessel). Once a potential threat has been detected, a laser energy source generates a laser energy signal of sufficient power to provide the necessary coverage. The laser energy is modulated using an oscillator to create the appropriate countermeasure signal. Next, fiber optics or other coupling device distribute the modulated laser energy signal to one or more apertures, preferably wide angle lenses or the like, disposed about the outer surface of the object to be protected. The number and location of the apertures will depend upon the circumstances of the installation as well as the desired coverage.

The invention discloses a demodulating reference signal design method and a device thereof, including a demodulating reference signal design pattern, a demodulating reference signal scrambling scheme, an allocation scheme of demodulating reference signal in single cell and an allocation scheme of the demodulating reference signal among multiple cells. The invention also provides a channel estimation method corresponding to the allocation scheme. The invention is not only applicable to single cell, but also to implementation of demodulating reference signal among multiple cells.

The invention belongs to the field of computer graphics, and especially relates to a GPU multi-thread texture mapping SystemC modeling structure. The structure comprises a texture parameter obtaining and Level calculation unit (1), a texel address calculation unit (2), a data assembly and task distribution unit (3), a texel data extraction and format conversion unit (4), a texel filtering and texel data normalization unit (5) and a texture mapping state and control parameter unit (6). The structure can avoid the tedious circuit signal design, quickly evaluates the framework of a large-scale hardware system, is suitable for the early system-level design and development of a circuit, and provides an effective reference for the same type of products and functions.

The invention relates to a lane-based real-time queue length prediction method and belongs to the technical field of intelligent transportation. The method, based on a traffic wave theory and a Robertson motorcade discrete model, compensates for the defect of a conventional queue length model which assumes that the arrival of vehicles complies with the same distribution (such as Poisson distribution), obtains the real-time number of vehicles passing by an upstream intersection and the license plate number data based on video detection data, obtains the proportions of vehicle traffic flow driving from different phases of the upstream intersection to different lanes of a downstream intersection, comprehensively takes account of the signal design of the upstream and downstream intersections,the length of a road section, and the discrete arrival characteristic of vehicles to predict the queue length in different lanes in real time, converts passive queue length estimation into active queue length prediction, and contributes to the signal optimization design of the associated intersections or the crowded road section in advance, so as to alleviate traffic congestion and improve a traffic environment.

A method is taught for increasing the steady-state verification speed of analog and mixed signal design through increased simulation speed, model abstraction by probing an existing component model or actual device and formal comparison of distinct component models. The innovative method taught here incrementally generates processor instructions optimized for operating the analog solver around a specific set of values (the operating context), caches sequences and applies the currently applicable operating context at each point in the simulation. The invention discloses a method for semi-automatically generating a mixed-signal or analog model based on iterative probing of an existing device or behavioral simulation. The invention teaches a method for model abstraction to alter the level of detail present in a running simulation. A means for graphically evaluating the match quality constitutes the final innovative step. The innovative method for the formal comparison of two analog or mixed signal models within a prescribed operating range for each interface between the model and its environment without the need for exhaustive simulation.

The invention discloses an unmanned ship navigation-following fixed time formation control method. The method belongs to the field of unmanned ship control, and comprises the following steps: establishing dynamics and kinematics models of a navigation unmanned ship and a following unmanned ship, designing a fixed time control law of a navigation unmanned ship subsystem so as to realize navigationunmanned ship trajectory control, and providing a control input signal for the following unmanned ship subsystem; designing a finite time disturbance observer to realize effective observation of environmental disturbance of the following unmanned ship; establishing integral sliding mode surface, determining a following error between the following unmanned ship and the navigation unmanned ship; designing a fixed time formation control scheme based on a finite time disturbance observer under complex disturbance. A fixed time tracking control strategy based on a sliding mode technology is appliedto the navigation unmanned ship subsystem, the navigation unmanned ship is driven to accurately track an expected trajectory, the tracking precision of the system is effectively improved, a stable navigation-following unmanned ship formation pattern can still be realized in the presence of external disturbance, and the robustness of the formation system is remarkably improved.

The invention discloses a high bit rate and low range resolution of low sidelobe phase coded signal design method which mainly aims at solving the problems that the range sidelobe of a phase coded signal cannot be further reduced by the existing method and the existing phase coded signal is easy to identify. The implementation process of the high bit rate and low range resolution of low sidelobe phase coded signal design method comprises step 1, setting the code element length of a phase coded signal; step 2, setting a value of the main lobe width control quantity of the phase coded signal; step 3, building an objective function of the phase coded signal according to the code element length and the main lobe width control quantity of the phase coded signal; step 4, building constraint conditions of the phase coded signal; step 5, solving the objective function by an optimization algorithm under the constraint conditions to obtain an optimized phase coded signal. According to the high bit rate and low range resolution of low sidelobe phase coded signal design method, the range sidelobe of the phase coded signal can be further reduced, the identified difficulty of the phase coded signal can be increased, and the high bit rate and low range resolution of low sidelobe phase coded signal design method can be applied to the design of the phase coded signal.