224results about "Passive radio relay systems" patented technology

Some embodiments provide a relatively small antenna apparatus that acts as a passive repeater. The antenna apparatus can be designed to facilitate radio frequency (RF) signal gain for a collection or range of frequencies. In some embodiments, the antenna apparatus is placed near a device with a wireless receiver and / or transmitter, where the antenna apparatus causes increased RF signal intensity at the device by coupling RF signals from a proximate area of higher RF signal intensity into the area around the device. Accordingly, in some instances, an embodiment of the antenna apparatus can be used to increase the RF signal intensity in a null spot or dead spot by coupling RF signal energy from an area proximate to the null spot that has higher RF signal intensity.

A radio communication system according to the present invention includes a scatterer configured to reflect, refract, or transmit a radio wave radiated primarily from a transmission side apparatus to radiate the radio wave secondarily to a desired area and a metamaterial is used for the scatterer.

The invention is directed to a method and system for equalizing the signal losses over cable runs in a Distributed Antenna System (DAS). In a DAS, two or more antennae are connected to the system by cable runs that can vary widely in length. As a result, the signal loss over a given cable run can also vary widely which can impact the design and deployment of the DAS and reduce antenna spacing. In addition, for a broadband DAS that supports many frequency bands or ranges using a common antenna unit, the signal losses vary with respect to frequency further making it difficult to equalize the cable losses. According to one embodiment of the invention, the method and system provide for measuring and adjusting the signal losses of each cable run to be a predefined value. According to another embodiment of the invention, the DAS can include a hybrid passive-active antenna unit for use in a DAS which includes a frequency multiplexer that separates the signal into frequency bands or ranges that are connected to an antenna element associated with a particular frequency band or range. Where a single frequency band needs to be amplified (or attenuated), a single band amplification block (SBAB) can be inserted in the connection between the frequency multiplexer and the antenna element to amplify (or attenuate) the desired frequency band. Where more than one frequency band need to be amplified (or attenuated), a multiband amplification block (MBAB) can be inserted in the connection between the frequency multiplexer and the appropriate antenna element to amplify (or attenuate) the desired frequency bands.

The invention discloses a positioning information assisted beam control method based on an intelligent reflecting surface. The intelligent reflecting surface can calculate and adjust the parameters ofthe intelligent reflecting surface according to the beam direction information transmitted by a base station, and enables a beam to point to a serving user terminal; the intelligent reflecting surface can perform parameter configuration efficiently, and achieves the precise beam control; in addition, a base station does not need to know complete channel state information, the base station realizes accurate positioning of the user terminal according to the results of corresponding angle estimation and flight time estimation; under the assistance of positioning information, the accurate controlof beams can be realized, the overhead of beam control can be effectively reduced, and the energy utilization rate of the system is improved. The positioning information assisted wave beam control method based on the intelligent reflecting surface is wide in application range, and is suitable for millimeter wave communication, terahertz communication and free space optical communication.

The invention belongs to the technical field of high-frequency wireless communication, and particularly relates to an intelligent reflection surface assisted terahertz communication system design method. The scheme of the invention is as follows: the communication system comprises a base station equipped with NBS antennas, an intelligent reflection surface formed by NIRS reflection array elements,and a mobile user terminal equipped with a single antenna. Through active hybrid beam forming, the base station transmits a transmitting signal to a relay formed by the intelligent reflection indicator in a wave beam form; and the intelligent reflection surface reflects the wave beam to a mobile user side by adjusting the phase of each array element, suppresses a received signal of an eavesdropper, establishes a joint optimization function by taking maximization of a downlink transmission data rate as a target, and optimizes the problem of maximization of a system transmission data rate through a phase search algorithm based on cross entropy. Compared with the traditional technology, the search frequency and the calculation complexity of the intelligent reflection surface phase matrix canbe effectively reduced, and meanwhile, the safety rate of the multi-input single-output terahertz communication system can be improved.

A millimeter band transmitter transmits one or more indirect path signal waves from the main lobe of a transmit antenna, and a direct path signal wave is transmitted in a side lobe of the transmit antenna. A receiver simultaneously receives each of the indirect and direct path signal waves if the receive antenna is unobstructed. If the direct line of sight path between the transmitter and receiver is blocked, the receiver only receives one or more of the indirect path signal waves.

An apparatus and method for transparently relaying a signal using a plurality of frequency bands in a multi-hop relay cellular network are provided, in which a Relay Station (RS) communicates with a Base Station (BS) via a relay link in a first frequency band and communicates with a Mobile Station (MS) within the sub-cell of the RS via a sub-cell link in a second frequency band different from the first frequency band.

The invention discloses a kind of time division multiplexing duplex relay system, which includes two antennas, switches orientation amplifier and control circuit. The antenna serves in the first and the second coverage area, the second coverage area is the expansion of the first coverage area. The switching orientation amplifier is coupled between the two antennas, and it has single amplifier. The control circuit is coupled to the input end of switching orientation amplifier and the antennas. The control circuit receives the transmission from the coverage area, and the control signal is used in the switching orientation amplifier in order to control the transmitting direction. The control circuit can control the gain and the direction of the amplifier based on the input signal power.

A building control and management system including an automation controller and a plurality of peripheral devices configured to perform building control-management system functions. The automation controller and peripheral devices communicate wirelessly and the peripheral devices can be enabled and disabled as wireless repeaters in a network formed by the automation controller and the peripheral devices. The automation controller can monitor the communication traffic levels in the wireless network and enable or disable peripheral devices as wireless repeaters to increase or decrease the communication traffic in the network.

A device for receiving and re-radiating electromagnetic signals. The device includes at least a waveguide with a first set of slot radiators for receiving electromagnetic signals, and a second set of slot radiators for transmitting electromagnetic signals generated on the basis of the received electromagnetic signals in the waveguide. The first set of slot radiators includes one or more slot radiators, and the second set of slot radiators includes one or more slot radiators. The device also relates to a method for receiving and re-radiating electromagnetic signals by a device including at least a waveguide, and the use of the device as a repeater of electromagnetic signals, for transferring electromagnetic signals through a structure, and / or as a building product.

The invention discloses a broadband wireless transmission method assisted by a distributed intelligent reflecting surface, and is suitable for the field of wireless communication. The method comprisesthe steps: evaluating the influence of each system parameter according to the closed expression of the downlink traversal rate of a large-scale multi-antenna millimeter wave broadband orthogonal frequency division multiplexing system, and guiding the hardware erection of an IRS array plane; in broadband system transmission, by a user, sending a pilot signal, estimating a reflection channel of each IRS, matching the strongest time domain tap to reduce complexity, channel estimation overhead and feedback quantity, and using an IRS phase shift matrix to match a IRS-to-user channel, a base station-to-IRS channel, and a base station-to-user channel to maximize downlink rate. An IRS transmission method with low channel estimation overhead, low feedback quantity and low complexity is provided, and an IRS phase shift matrix is used for matching the IRS-to-user channel, the base station-to-IRS channel and the base station-to-user channel so as to maximize the downlink rate.

The invention belongs to the technical field of wireless communication, and particularly relates to a design method of a reflecting surface assisted device-to-device communication system. The scheme of the invention is as follows: a base station receives useful signals from cellular users and interference signals from D2D sending equipment multiplexing the same frequency band; and the D2D receiving equipment receives the useful signals from the corresponding D2D sending equipment and the interference signals from the cellular users sharing the same frequency band. According to the invention, the pairing scheme of the D2D pair and the cellular user is determined through a heuristic method, and the sending power of the D2D link and the cellular link and the passive beamforming of the reflecting surface are optimized in a combined manner, so that the maximization of the system sum rate is realized under the condition of meeting the communication rate requirements of the D2D user and the cellular user. Through simulation verification, under the conditions that normal communication of a traditional cellular system is not affected and energy, frequency spectrum and cost expenditure are not additionally increased, the system sum rate is greatly increased, and the method has very high application value and development potential.

The invention belongs to the technical field of high-frequency wireless communication, and particularly relates to a design method of an intelligent reflection surface assisted indoor terahertz MIMO communication system. The scheme of the invention is as follows: the communication system comprises a base station equipped with NBS antennas and MBS radio frequency chains, an intelligent reflectionsurface formed by NIRS reflection array elements, and a mobile user terminal equipped with NMS antennas and MMS radio frequency chains. And the base station sends NS data streams to the mobile user side through the intelligent reflection surface, a joint optimization function is established by taking maximization of the downlink transmission data rate as a target, and the problem of maximization of the transmission data rate of the system is optimized based on a genetic algorithm of artificially reserving excellent genes. Compared with the traditional technology, the scheme of the invention can greatly reduce the calculation complexity of IRS reflection unit phase search.

This invention discloses a relay selection and power distribution method used in a two-hop cellular system including setting multiple relay stations in the said cellular system, initializing their working parameters and getting path information from the base station to the users according to user information combining with the working parameters of the relay stations, selecting a relay station with the least two hop path loss as a service one for each user and detecting the multi-area system interference of communication chains and utilizing adaptive power distribution method to design the powers of the signal emit end and the selected service relay stations.

A data acquisition network includes an assembly of nodes including at least one wireless network of nodes in which two neighboring nodes transmit data between each other by radio waves. The assembly of nodes also includes at least one other network of nodes in which two neighboring nodes transmit data between each other by a cable. The data is also conveyed by radio waves. The at least one other network forms a cabled network of nodes.

A communication system is disclosed herein. The communication system includes a master device that includes a master clock and is connected to a host through a communication network, and a plurality of nodes connected to the master device. The master device transmits one or more periodic beams that include a radio frequency. Each of the nodes includes a node clock that is configured and in synchronization with the master clock based on the one or more periodic beams. The communication system establishes a connection for communication between the master device and at least one node when the node clock of the at least one node is in synchronization with the master clock. The communication system further includes at least one repeater 104A operatively connected between the master device and at least one node.

A straight amplifying station supporting time - division duplex mode in orthogonal FDM system consists of down - link amplifying unit for receiving down link signal from base station and amplifying it to send it to terminal, up - link amplifying unit for receiving up link signal from terminal and amplifying it to send it to base station, radio frequency switch circuit for switching over up - link and down link amplification, unit for changing over time of up link and down link signal to let signal amplification at amplifying station synchronize strictly to time of receiving and emitting signal at base station.

This invention is a kind of power allocation method for two hops multi-antenna relay system. It concludes: the channel status information of the two hops links are ensured according to the structure of the said two hops multi-antenna relay system; the matrix H of the first hop channel status information is processed the singular value decomposition. The decomposed consequences matrix V, matrix U and diagonal matrix S are respectively fed back to the said signal transmission end, the said relays and the said signal receiving end; the said signal transmission end uses matrix V to preprocess the transmitted signal t, which is changed to Víñtú”the said several relays uses matrix U to process the received first hop signal Víñt. They also retransmitted the processed signal Síñt to the said signal receiving end; based on the channel status information of the two hops links and the diagonal matrix S, with the optimizing rule that the system end-to-end instantaneous information rate achieves maximization, the said signal receiving end calculates the emission power of the first hop link P1 and the emission power of the secondary hop link P2. Thus, the power self-adapting allocation is achieved.

The invention discloses a wall-mounted wireless router for enhancing antenna signal intensity. The wireless router comprises a shell, a connecting plate, a plurality of antennas and a plurality of reflecting plates. The connecting plate is connected with the shell, and the connecting plate is provided with at least one hanging element used for hanging the shell on the wall. Each antenna is arranged on the shell, the centers of several antennas are annularly arranged along the center of the shell and are enclosed to form a first area, the reflecting plates are arranged on the shell and are located in the first area, the reflecting plates are arranged to correspond to the antennas, and the reflecting plates are used for shielding the corresponding antennas, so that the antennas are separated by the reflecting plates. The heights of the reflecting plates on the height extension direction are greater than those of the correspondingly arranged antennas, and the reflecting plates comprise metal reflecting surfaces, and the metal reflecting surfaces are arranged to face to the correspondingly arranged antennas. The wireless router provided by the embodiment of the invention can be suspended on the wall, thereby saving space and enhancing the antenna signal intensity.

The direct passing through station includes an active channel, a detection channel and a control channel. The said active channel includes an up going link and a down going link. The said links include same donor antenna, retransmission antenna and two duplexers, and each link includes a low noise amplifier and a power amplifier; the detection channel includes a frequency synthesizer and a mixer; the control channel includes a monitoring and controlling process unit. The frequency synthesizer generates a reference signal under control of the monitoring and controlling process unit. Reference signal passed through transmitting from and receiving by antenna is mixed with reference signal original generated by mixer and frequency synthesizer. The said mixed signal enters into the monitoring and controlling process unit, which sends out control signal to adjust gain of amplifier in active channel so as to realize self-adapting function.

The invention provides a design method of an intelligent reflecting surface assisted high-energy-efficiency unmanned aerial vehicle communication system, and belongs to the field of energy efficiency optimization of an unmanned aerial vehicle communication network. The communication process comprises two parts of transmission links, one part is an information source which is directly sent to an information sink, the other part is reflected and transmitted through an intelligent reflecting surface attached to the unmanned aerial vehicle, and the two parts exist at the same time. On the basis of the thought of block iteration, an original problem is decomposed into three sub-problems to be solved, and a non-convex optimization problem is converted into a solvable concave-convex score planning problem by using a continuous convex approximation technology. The invention provides a design method for jointly optimizing passive beamforming of an intelligent reflecting surface, active beamforming of a base station and a flight path of an unmanned aerial vehicle. According to the method, an optimal network design can be generated according to model parameters so as to maximize system energy efficiency.

This invention puts forward a method and a device for interacting information in a repeater of the TD-SCDMA system to set up instructive information interaction between communication module and monitor module and transfer network information received by the repeater to the monitor module by instruction, which adjusts and maintains various parts of the repeater based on it and transmits the monitor information to the communication module by short message and then to the network manager to send adjustment and control information to the repeater based on the monitor information so as to realize remote maintenance of repeaters.

The invention discloses a semi-blind channel estimation method for an intelligent reflecting surface auxiliary communication system, which comprises the following steps that: firstly, a base station sends a corresponding intelligent reflecting surface reflection phase configuration signaling to an intelligent reflecting surface, wherein the intelligent reflecting surface is configured according to the signaling; a user sends a pilot symbol to the base station, and the base station performs initialization estimation on the cascade channel according to a received signal; then, the user sends a data symbol to the base station, and the data symbol is reflected to the base station through the intelligent reflecting surface; the base station firstly calculates a probability density function of a complete data set composed of a received signal and defect data, a log-likelihood function is solved for the probability density function, and by calculating cascade channel estimation when conditional expectation of the log-likelihood function is maximized, an accurate cascade channel estimation value is obtained through iteration. According to the invention, the cascade channel can be estimated by using fewer pilot signals, the pilot overhead of a large-scale intelligent reflector system is effectively reduced, and the communication rate of the system is improved.

A method of transmitting and redirecting a radio signal using a data transmission system, the data transmission system including a data collection unit, a radio transmitter being connected to the data collection unit, and a redirection device being arranged at the top of a hollow shaft, the radio transmitter and the data collection unit being arranged in a lower part of the hollow shaft, the method including the steps of the radio transmitter transmitting the radio signal representative of measurement data from the data collection unit, and the redirection device redirecting the radio signal to be received at a communication device. The invention furthermore relates to a data transmission system and a redirection device adapted for operating in accordance with the above mentioned method.

The present invention discloses a repeater antenna comprising a plurality of radiation elements arranged in a first electrically conducting layer or plane. The repeater antenna also comprises a ground plane spaced apart from the radiation elements by a layer of dielectric material, and the radiation elements are each given such an extension (L1, L2, L3) and such a distance (D12, D23) to neighboring radiation elements that an incident electromagnetic wave will reflect from the repeater antenna at an angle (α2) that by a predetermined amount will be greater or smaller than the incident angle (α2) of the electromagnetic wave. The repeater antenna is plane, and can be either curved or flat.

The invention discloses a passive intermodulation improvement method for base station signals of a mobile communication system. The method includes: transmit signals of a base station system are divided into two channels through a base station coupler, signals of one channel are outputted to a GRRU (GSM radio remote unit) near-end machine of a DCS (data communication system) through a coupling port of the base station coupler, and the signals are then transmitted to a GRRU far-end machine by the GRRU near-end machine through optic fiber transmission and outputted by the GRRU far-end machine to be transmitted through an antenna for signal coverage; and signals of the other channel are outputted to a filter through a direct connection end of the base station coupler to enable signals outputted by the filter to be absorbed through a tail-end load. Using the method can effectively suppress intermediation products of the load absorbing tail-end signals of the base station to enable output signals of the base station system to be controlled through reflection passive intermodulation products of the tail-end load, and interference of passive intermodulation signals to uplink signals of a GSM (global system for mobile communication) system can be eliminated, so that system cost can be greatly reduced, and indexes for precision evaluation of the system can be obtained.

The invention discloses a double-mode relay station and a network access method, a mode conversion method and a control station thereof. While the double-mode relay station accesses the network, whether to access the network with a terminal mode is determined through negotiating with the control station thereof, if the terminal mode is selected for accessing the network, relay functions of the double-mode relay station can be started according to demands of business and the network after accessing, converting to a relay station operation mode. Both the double-mode relay station and the control station can request to start the relay functions of the double-mode relay station. In the mode conversion process, firstly, the relay station and a base station negotiate to start the relay functions of the double-mode relay station and negotiate a suitable path for starting the relay station; secondly, the double-mode relay station determines whether to set an operation mode of the double-mode relay station to be the relay station mode according to the negotiated results. The double-mode relay station and the network access method, the mode conversion method and the control station thereof realize flexible control to the relay station operation mode, especially having advantages in applications of non-fixed relay communication systems such as nomadic relay communication systems, mobile relay communication systems and so on.

The invention provides an signal uplink transmission method and a corresponding transmission device in a relay equipment which is based on a relay wireless network, the relay equipment is taken as the relay equipment of the final jump, the method comprises the steps of receiving signals to be transmitted which is from a mobile terminal; adopting the collaboration space multiplexing transmission mode with other one or more relay equipments as the final jump to send the signals to be transmitted to a base station. The method further includes the step of receiving control signals from a base station, the control signals include identification information, and the identification information includes pilot frequency information and resource allocation information. The invention also provides an auxiliary control uplink transmission method and a corresponding auxiliary control device in the base station which is based on the relay wireless network, the method controls a plurality of relay equipments which are taken as the final jump to adopt the collaboration space multiplexing transmission mode to send the signals to be transmitted to the base station. The transmission device and the auxiliary control device can be respectively applied in the relay equipments and the base station, thereby enhancing the transmission capacity of the final jump.

The invention discloses a channel estimation method and system based on positioning information assistance in an RIS system in an Internet of Vehicles environment, and the method comprises the following steps: obtaining the relative position information of a base station, an intelligent reflection surface, namely an RIS, and a vehicle based on the Internet of Vehicles system; obtaining the azimuth angle and the elevation angle of the effective signal in the line-of-sight propagation process from the base station to the RIS and from the RIS to the receiving end; constructing a cascade channel G from the base station to the RIS and a cascade channel hr, k from the RIS to the receiving end, and solving a cascade channel Hk; constructing a channel model, and constructing an overall measurement matrix Hk of Q time slots; writing Hk into a CS model according to an angular domain cascade channel, constructing a new dictionary matrix D according to azimuth angles and elevation angles of received signals and reflected signals, and constructing a new sensing matrix Aq=(D*theta'q)H; setting a signal received by the receiving end as an initialized residual vector r0, calculating the correlation between the sensing matrix A and the residual vector r0, and obtaining a row row * with the maximum amplitude according to the correlation; and according to the obtained row *, obtaining a sparse vector of an estimation channel H through an LS algorithm, and updating a residual vector to obtain the estimation channel.