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 relates to a non-stationary V2V MIMO channel modeling method based on geometry. The method comprises the following steps in sequence: establishing a V2V double-loop scattering model; establishing a channel impulse response between the V2V MIMO channel transmitting antenna 1 and the V2V MIMO channel receiving antenna k according to the V2V double-loop scattering model; and according to the geometrical relationship among the mobile transmitting end, the mobile receiving end and the scatterer, time-varying channel parameters of the arrival angle, the departure angle, the Doppler phase shift and the propagation distance of the electric wave are derived. The non-WSS channel model established in the invention is the extension of a stationary double-loop model, and can simulate thenon-stationarity of a V2V channel in a time delay domain and a space domain; parameters such as a scatterer concentration factor, an angle mean value, a vehicle moving speed and an antenna array direction angle comprehensively act on channel statistical characteristics and non-stationary characteristics; the V2V non-stationary channel modeling method is enriched, and the statistical property and non-stationary research of the channel has a practical application value for V2V communication system design and evaluation.

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.

The invention relates to a cross-domain distributed large data communication system design planning method. the method comprise the following six steps of allocating a data domain, arranging a data planning hardware platform, setting a data communication protocol, allocating a data source, constructing a extrusion data model and data. By adopting the method, on one hand, the network structure can be effectively simplified, and the occupancy rate of the network data communication on network resources is reduced. Therefore, the running cost of the communication network is reduced, and the data communication processing speed is improved at the same time. Meanwhile, the synchronization management of the credibility of the cross-domain data access is realized according to the frequency, the range and the type of cross-domain data access. As a result, the management safety and the management reliability of the data cross-domain communication are further improved. The data communication efficiency of the cross-domain data access operation is further improved.

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.

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 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.

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.