67 results about "Communication system design" patented technology

The transmission of ATM, Internet, and satellite communications is unified through international standardized protocol embedment. Global and Local performance optimization are achieved through the combination of combinatorial, dynamic, and probabilistic programming. A simultaneous domino effect of bandwidth conservation, efficiency enhancement, reliability improvement, traffic congestion prevention, delay minimization, and speed multiplication are realized for any digital communication system, particular in Internet. With three levels of error coding in ATM cells, the loss cell recovery and bit integrity are preserved. From its mathematical roots, new combinatorial sets are systematically generated, and applications of the sets are identified. Among the applications, optimal sequences can be produced for multi-user and multi-function communication system designs. Optimality is in terms of maximum possible number of sequences with given sequence length and sequence characteristics. The results are unique and theoretically proven. By serial and parallel concatenation of error codecs, reliability of multimedia transmission can be satisfied to any desirable level. As a part of the unified transmission scheme, the acquisition and synchronization method of cascading sequences exhibits significant improvement in correlation properties and detection probabilities. A method of using block designs is demonstrated to derive, to generate, and to construct low-density parity check block codes and threshold decodable convolutional codes. An efficiency evaluation method is formulated for the combination operation of ATM, Internet, and satellites.

A modular wireless Internet access communications system designed to extend broadband 802.3 linear-bus topology up to fifteen miles beyond the physical limits of DSL or cable technologies through the integration of specialized wireless hardware devices, firmware, and protocols.

Exemplary embodiments of the present disclosure automatically generate Virtual Local Area Network (VLAN) configuration data from a logical data flow between intelligent electronic devices (IEDs) of a process control (PC) system in accordance with a standardized configuration representation of the system. The process IEDs, switches of an Ethernet switch-based communication network to which the IEDs are connected, and connecting cables are made aware of the assigned VLANs. Any performance analysis or diagnosis on these components can show design problems with VLANs and communication architecture already at engineering or communication system design time.

The invention relates to a small electric unmanned helicopter aerial photography system based on a front-end triaxial-type pan-tilt. The small electric unmanned helicopter aerial photography system is a small unmanned helicopter aerial photography system design mainly comprising a front-end triaxial-type pan-tilt design, a small unmanned helicopter platform design, a ground station design, and a communication system design, and belongs to the technical field of aircraft designs. The aerial photography system is light and flexible, high in integration level, low in noise, small in vibration, good in use maneuverability, low in requirements on the conditions of use environments, site and the like, and capable of realizing the omnibearing photography. The aerial photography system has a high practical value and a wide application prospect in the field of unmanned aircrafts.

Disclosed embodiments include a telemedicine communication system designed to make possible “virtual” patient visits by approved visitors such as the spouse, family, and friends of the hospitalized patient having the appropriate digital certificate and visitation / communication permissions. According to one embodiment, the system enables relatives to visit hospitalized patients using audiovisual communication modalities selected according to the severity and health status of the patient. Additionally, the system provides functionality to enable approved relatives to follow the health status of the patient according to their permissions.

The invention discloses a voice secret communication system design method based on compressive sensing and information hiding, comprising the following steps: embedding secret voice into carrier voice by an embedded system to obtain mixed voice; designing a compressive sensing overcomplete dictionary aiming at the voice signal; sampling the secret voice by a compressive sensing self-adaption observation matrix to obtain a observation vector for reducing dimensions; quantizing the observation vector by an LBG (Linde-Buzo-Gray algorithm) vector, taking the quantized observation vector to serve as secret information to embed into the carrier voice, and carrying out two-stage transform on the carrier voice to obtain mixed voice; extracting the secret voice from the mixed voice by an extraction system; carrying out discrete cosine transform on mixed voice, and improving wavelet transform two-stage transform to obtain a wavelet transform coefficient; obtaining a secret bit stream by a scalar Costa decoding algorithm; obtaining a reconstructing observation vector by an LBG vector quantization decoder; reconstructing the secret voice by a compressive sensing orthogonal matching pursuit algorithm; and improving the quality of the reconstructed secret voice with a wavelet denoising method.

The invention relates to methods by which radio signals can be transmitted to, and received by, a radio receiver such that the receiver consumes very little power from a battery or energy source. The invention is applicable not only to medical implants, but any application requiring a radio receiver to operate with very low power consumption.

The invention belongs to the technical field of wireless communication, and provides an intelligent reflecting surface assisted power domain NOMA communication system design method, which assists a base station to send information to a non-orthogonal user by introducing a metamaterial intelligent reflecting surface. The design method comprises the following steps: establishing an intelligent reflector auxiliary NOMA system model, giving a user received signal expression and a detection signal-to-noise ratio, proposing a 1-bit coding random phase shift mechanism to convert continuous phase shift of an intelligent reflector into random phase shift, controlling a reflection unit through '1' and '0' switches, and deriving an interruption probability theoretical expression of a user. Compared with a traditional OMA system assisted by a decoding forwarding relay, an amplifying forwarding relay and an intelligent reflecting surface, the method has the advantages that the outage probability performance and the system spectral efficiency are improved, and the application value is high.

The invention discloses an automotive anti-collision radar detection-communication integrated function realization method, and belongs to the technical field of radar and wireless communication. The automotive anti-collision radar detection-communication integrated function is realized by adding a label identification function of a roadside traffic sign for a forward anti-collision radar by utilizing a back-scattering communication technology. For the problems of high label identification error rate caused by the condition that the back-scattering signal is weak in energy and can be easily influenced by the target echo, clutter and noise of a vehicle, the invention provides a frequency modulated continuous wave radar back-scattering communication system design method based on spread spectrum encoding, a direct sequence spread spectrum technology is introduced into the back-scattering modulation of the label, and a label back-scattering signal is enhanced by utilizing a spread spectrumgain produced through receiving despreading processing, thereby realizing aims of label target detection and information extraction. The method disclosed by the invention has the advantages that the radar hardware upgrade is unnecessary, the system performance is stable, and the interference resistance is strong.

A modular wireless Internet access communications system designed to extend broadband 802.3 linear-bus topology up to fifteen miles beyond the physical limits of DSL or cable technologies through the integration of specialized wireless hardware devices, firmware, and protocols.

A computer-implemented method is disclosed for integrating at least one first communication terminal assigned to a user as a preferred device in a static configuration of a communication system and / or for dynamically switching from a first communication terminal used as a preferred device to a second communication terminal as a preferred device for providing a one-number service using the preferred device, to which a one-number service number is assigned, wherein at least two communication terminals are statically assigned to the user and a preferred device is also dynamically assigned to the user through a virtual device. Also disclosed is communication system designed for this purpose.

A network instant communication system design method capable of freely setting several virtual network instant communication identifying number by user, which contains said system providing a core identifying number as fixed network instant communication address and providing several virtual identifying number for each core identifying number, user providing to linkman with the virtual identifying as the connection mode of network instant communication, system classifying all communication according to affiliated virtual number, operated in same interface, each virtual number is relatively independent, user can respectively set the state and parameter of each virtual number, freely set, delete and change virtual identifying number after applying a core number, in order to establish independent communication with various kinds of linkman to obtain protecting privacy.

A pair of wireless watch-like wristbands with radio frequency transmission and reception capabilities, for the purpose of locating, alerting, and communicating important information to and from persons; a wireless communications system designed to summon persons such as children back to a pre-arranged meeting site at the press of a button; a waterproof wireless communications system to summon a person.

The invention discloses a redundancy communication method for direct current control protection system. The redundancy communication method for the direct current control protection system comprises the steps: A) setting a redundancy double-communication processing unit for each protective device in the direct current control protection system, exchanging the data between the redundancy double-communication processing units through an inner high speed data bus; B) respectively connecting with external redundancy double-channel physical link physically by each redundancy double-communication processing unit; C) receiving the data on the corresponding external redundancy double-channel by the communication processing unit in each redundancy double-communication processing unit, and forwarding the data to the other communication processing unit on the positioned redundancy double-communication processing unit by the inner high speed data bus; D) independently processing the data of external redundancy double-channel by each redundancy double-communication processing unit, and realizing the mutual redundant backup. The redundancy communication method for the direct current control protection system is capable of improving the reliability of the communication redundancy, and simplifying the design of the communication system, is used for a plurality of communication application occasions between the protective devices, and has good application prospect.

Detection method and device for a receiver in a digital communication system designed to process a frame comprising a periodic sub-set of length n, said method comprising the following steps: —determining a first vector u having a length n;—determining a second shifted vector v;—calculating a correlation function between said first and second vectors; —calculating a quadratic error function between said first and second vectors;—calculating a first cost function that is a linear combination of both preceding functions and, according to the sign of the result,—calculating a second cost function of frame beginning estimate; and—starting the communication system receiver.

The invention belongs to the technical field of wireless communication, and discloses a channel characteristic analysis method and system, a medium, equipment and a processing terminal.The channel characteristic analysis method comprises the steps that a deterministic channel model is constructed based on geometric information and electromagnetic information of a specific propagation environment, and a channel characteristic analysis result is obtained by solving a Maxwell equation or an approximate propagation equation; calculating a multi-dimensional channel parameter at the predicted receiving point; proposing a wireless channel characteristic analysis method based on a simulation result of the deterministic channel model; aiming at a propagation scene, systematized and planned parameter extraction and characteristic analysis are carried out on typical channel parameters; on the basis of a K-means algorithm, a multipath parameter is added as a weight measurement, selection of a centroid is optimized, and a channel clustering algorithm is improved. Based on a reverse ray tracing algorithm, accurate electromagnetic wave path prediction and multi-dimensional channel parameter calculation are carried out, a channel characteristic analysis method of the system is defined, and an accurate theoretical basis is provided for wireless communication system design and network planning.

The invention relates to the field of unmanned autonomous vehicle communication system design, in particular to a cable-free communication autonomous underwater vehicle. Various wireless communicationdevices such as low power consumption, high speed and underwater acoustic communication are integrated on the autonomous underwater vehicle, and all the wireless communication devices are used underdifferent task stages; a low-power-consumption module is used in the awakened stage of the autonomous underwater vehicle, used for a small amount of data communication between the autonomous underwater vehicle and a carrier when the autonomous underwater vehicle does not leave from the carrier and used for receiving carrier instructions; a high-speed wireless module is used for meeting the high-speed data communication needs before the autonomous underwater vehicle is launched or when the autonomous underwater vehicle is exposed out of the water surface; and underwater acoustic communication is used for meeting the need of a small amount of data communication of the autonomous underwater vehicle during underwater working. The various wireless devices of different types constitute an autonomous underwater vehicle cable-free communication technology jointly. Cable-free communication between the autonomous underwater vehicle and the carrier is achieved, manual intervention in the whole process is not needed, when entering water to work and obtaining a large number of task data which need to be transmitted back, the autonomous underwater vehicle only needs to float upwards, recovery isnot needed, cable butt joint is not needed, and the working efficiency of the autonomous underwater vehicle is effectively improved.

The present invention discloses a channel state tracking method based on a training sequence, wherein the method is suitable for an OFDM system and comprises the steps of: (1) obtaining channel impulse response information according to a known training sequence; (2) determining a decision parameter according to the channel impulse response information, wherein the decision parameter is used for characterizing the channel characteristic; and (3) deciding the current channel type from a plurality of channel types supposed beforehand according to the decision parameter. By adopting the channel state tracking method based on a training sequence, an OFDM receiver has the capability of tracking channel change in mobile reception environment, and can correspondingly adjust the channel estimatingmethod according to the channel change, thereby ensuring that the receiver can work in a better working state under a plurality of channel environments. The channel state tracking method based on a training sequence of the invention is especially suitable for a wireless communication system designed for reception in the mobile environment.

Embodiments of the invention provide a communication system design method and device as well as a communication system. The method comprises the following steps of obtaining an input parameter of a to-be-designed system; matching in a design case library to obtain a matching case according to the input parameter, wherein the input parameter and the design result of at least one design case are stored in the design case library; and designing the to-be-designed system according to the design result of the matching case. The embodiments of the invention adopt a case-based reasoning algorithm. An influence factor of system design is input into the case library as an input parameter to carry out case retrieval and optimization in order to obtain the matching case as an optimal case, and operations, such as reuse and correction, are carried out on the case to obtain the design result of the to-be-designed system, so that a WDM system design process is simplified, the problems of complicated system design, long consuming time and inaccurate design result are solved, the starting efficiency is improved, the cost is reduced, and the condition that the existing communication system design method needs to redesign all parameters at each design is avoided.

The invention provides an Li-Fi communication protocol based communication control system. The invention relates to the technical field of optical communication and solves technical problems of high implementation time delay and low precision of clock signals used for Li-Fi coding due to existence of parasite charges and residual charges, deficiency of an effective Li-Fi receiving module and deficiency of a power source matching property in the prior art. The system mainly includes a power source and a communication load circuit; a first FPGA; a second FPGA connected with a photosensitive amplification circuit; a first field effect tube receiving a duty ratio modulation clock output by the first FPGA and turning on or turning off the power source; a vibration circuit receiving first modulation power source output by the first field effect tube, receiving a control clock output by the second FPGA and compensating or releasing the first modulation power source output by the first field effect tube; a second field effect tube controlled by an oscillation circuit and form a voltage drop switch circuit structure together with the first field effect tube; a duty ratio detector. The invention is used for Li-Fi communication system design.

The invention relates to the technical field of antennas in the comprehensive design of communication systems, in particular to the design of frequency reconfigurable microstrip antennas, specifically a miniaturized frequency reconfigurable microstrip slot antenna, which solves the problem of the large number of antennas in the current wireless communication system and the radio frequency The technical problem of low front-end integration. It consists of three layers, the upper layer is a microstrip feeder, the middle layer is a dielectric substrate, and the lower layer is a ground plane. The ground plate is etched with two L-shaped open-circuit gaps and one U-shaped short-circuit gap, and all the gaps are left-right symmetrical about the center of the ground plate. In order to achieve frequency reconfigurability, a PIN diode is loaded in each slot, and the antenna produces four working modes by controlling the different combination states of the diodes. The invention can work in the 2.3GHz frequency band of the fourth generation mobile communication system, the 4.4GHz frequency band of the aeronautical mobile telemetry system and the 5.8GHz frequency band of the wireless local area network system.