66results about How to "Increase receiving power" patented technology

A method of determining when cable modems in a distributed digital data delivery service over cable TV hybrid fiber coaxial cable network have a headroom problem and resolving said problem. The method involves measuring the burst power from each cable modem, and if the burst power is too low, requesting the cable modem whose burst power is too low to increase its transmit power, and keeping track of which modems have been requested to increase their power. If a predetermined number of requests to increase power have not resulted in the cable modem transmitting with sufficient power for reliable reception, the cable modem is listed as having a headroom problem. Subsequent requests for upstream bandwidth from all modems with headroom problems are analyzed to determine if the requested burst size is too large and will result in a headroom problem. If so, a calculation as to the maximum number of spreading codes that each modem with a headroom problem can simultaneously transmit on without a headroom problem. The requested burst is then broken down into smaller burst fragments, and appropriate upstream minislot assignments adequate to transmit the burst fragments are made and sent to the cable modem.

An on-board wireless communication apparatus using an OFDMA scheme includes: a position information acquisition unit which estimates a position after a predetermined time period based on base station position information, mobile station position information, and speed information of mobile station as estimated mobile station position information; a transmission path information storage unit which determines a transmission rate to be applied based on the estimated position information and a distribution of the transmission rate determined by a distance from the base station; a reception buffer unit which stores received data; a reception buffer amount adjustment unit which determines a data amount to be received based on a data storage amount from the buffer unit and a type of the data therein; and a band allocation unit which determines a band requested to the base station by the transmission rate from the storage unit and the data amount from the adjustment unit.

The invention relates to an indoor VLC-WiFi hybrid communication system access selection method, and belongs to the technical field of the optical communication. The method comprises the following steps: improving correlation of receiving-transmitting end based on gravitation theory, and optimizing an access selection decision of the user based on the gravitation theory in a hybrid system composedof the cascaded VLC and WiFi; taking WiFi as supplementary technology of the VLC, designing an optimal access principle for the user under the extreme VLC channel status that all available VLC APs are shielded and located in a line-of-sight link dead zone; and designing a dynamic load assessment formula and an access point quality assessment formula based on self-adaptive QoS weight for residualusers at a transmitting end; designing the user quality assessment weight formula at a receiving end; improving the gravitation theory through the assessment weight so as to determine the bidirectional communication selection of the access point and the user. The throughput capacity of the VLC-WiFi hybrid communication system can be effectively improved, and the indoor VLC-WiFi communication access selection decision is optimized.

The invention relates to a method for operating a wind energy plant, the wind energy plant having a rotor with at least one rotor blade which has an adjustable pitch angle, the wind energy plant having a generator coupled to the rotor, and a regulation means which, if a there is a deviation of the rotation speed of the generator or rotor from a rotation speed set point, adjusts the pitch angle of the at least one rotor blade such that the rotation speed set point is reached again, wherein an electrical quantity provided by the wind energy plant by means of a generator and fed into a grid is reduced to a predetermined value in a short time by a reduction of a preset value for the generator, wherein prior to the regulation means noticing a deviation of the rotation speed of the rotor or generator from the rotation speed set point effected by the reduction of the preset value, an adjustment of the at least one rotor blade to a new pitch angle is initiated, wherein at the new pitch angle the rotation speed of the rotor or the generator reaches the rotation speed set point at the reduced electrical quantity and the current wind speed. In addition, the invention relates to a wind energy plant.

The present invention provides a hierarchical codebook structure design method of a joint method used for the wireless communication technology. The codebook designed by the invention satisfies two design principles that all code words in a same layer needs to cover a whole space, the space coverage range of any code word in any layer of a codebook must be the set of the code words in a next layer; at the same time the lobe width of a kth layer is 2/2k, and the codebook of a last layer uses an expression form of a channel pointing vector. In the time of generating the code words of each layer, firstly the first code word of each layer is generated, then the code word is rotated to point to different directions, and all code words of the layer can be constructed. The hierarchical codebook designed by the invention is employed to carry out searching, the convergence rate of a search method is fast, the search success rate is high, the gain of beamforming is high, the receiving power is large at any stage, the utilization rate of emitting power is high, and the robustness is good in a condition of multiple paths.

Changes in instructions for increasing/decreasing transmission power that have been decoded from TPC bits are monitored, and when the increase/decrease instructions in a prescribed time interval are biased toward instructions for increasing the transmission power, the peak direction or main lobe width of the transmission beam is changed by regulating the transmission power or transmission antenna weights that correspond to each of a plurality of antenna devices. These processes are repeated until the bias toward instructions for increasing the transmission power in the instructions for increasing/decreasing transmission power is eliminated or until the number of changes of the transmission beam reaches a maximum value that has been set in advance.

The invention belongs to the technical field of communications, and discloses a beam-forming method for NLOS scenarios in massive MIMO, comprising: obtaining a channel estimation matrix at the base station side; performing autocorrelation on the channel estimation matrix to obtain a spatial correlation matrix; constructing an optimization problem according to a maximum received signal-to-noise ratio criterion; performing equivalent minimization on the optimization problem; solving the optimal weight vector; performing maximum naturalization; performing Crohneck product with vertical antenna weight; and multiplying by transmission data. The invention has the advantages of low sensitivity to channel time-varying characteristics, strong anti-non-line-of-sight NLOS capability, low algorithm complexity and simple implementation, and finally improves the receiving power of the desired user. The invention solves the problems that the beam-forming method of the prior art has weak resistance tochannel time-varying, and cannot effectively improve the received power of the desired user in the case of multipath, and the algorithm has high complexity.

The invention relates to a hybrid beam forming method based on maximized minimum phase difference. An existing method for simulating a beam forming part requires a large number of codebook sets for recovering the signal transmitted by the terminal, which results in an excessive complexity and difficult implementation. The method comprises the steps: firstly selecting a vector set, capable of providing higher signal power, from a simulation beam forming vector codebook through using the correlation characteristics of a channel gain threshold and an array response vector; secondly, measuring theinter-user interference through the phase difference between the simulation beam forming vector and a main propagation path array response vector, and proposing the criterion of maximizing the minimum phase difference to suppress the strongest inter-user interference. The vector set capable of providing higher signal power is screened from the simulation beam forming vector codebook through the channel gain threshold, thereby ensuring large received power. The method of the invention can reduce interference between users, enlarges system capacity, and ensures lower complexity.

The invention discloses a load positioning and power constant control method for a three-dimensional wireless charging system. The method comprises the steps of establishing a magnetic circuit model and a circuit model of a three-dimensional wireless power transmission system, obtaining a constraint relationship of each parameter variable through circuit analysis, obtaining positions (magnetic positions) of loads under different degrees of freedom based on the constraint relationship, and realizing spatial positioning of the loads; meanwhile, determining an optimization target and constraint conditions of the three-dimensional wireless charging system under known parameters , then converting a nonlinear programming problem into a linear programming problem; and finally, realizing the constant load receiving power in a linear programming mode. According to the invention, position (magnetic position) identification of the load under different degrees of freedom can be realized; the constant load receiving power is realized on the basis; and theoretical guidance and technical support can be provided for application and development of the three-dimensional wireless charging system.

An antenna amplifier includes at least one input for connecting to an antenna and at least one output for connecting to a receiver, as well as at least one means of signal-level matching positioned between the input and the output. The antenna amplifier improves the noise-to-useful signal ratio, in particular in situations in which a noise signal having a high level is applied, by providing a narrow-band filter situated between the input and the means of signal-level matching, with the mid-frequency of the filter passband being able to be changed and tuned to the receive channel of the receiver.

The invention discloses a transmission method for broadcast multicast service that includes it determines the occupied frequency source of broadcast multicast section transmitting the service data of broadcast multicast service based on several sections transmission mode in the honeycomb section with frequency reusing; chooses the corresponding frequency source which has the same frequency of determined frequency source in the broadcast section adjacent with multicast sections; said single-cast section based on the chosen frequency source and the broadcast multi-cast section based on the determined frequency source transmit the broadcast multicast service synchronously. The invention also discloses transmission system of broadcast multicast service. The invention can improves the receiving property in the transition zone between the single-cast sections and the broadcast multi-cast sections.

The invention discloses a method for expanding capacity of Ad Hoc network through mitigating interference using multiple antennas MAC (MIMO-MAC) optimization. The method comprises the following step that: each node is provided with a plurality of antennas, and the number of the antennas on each node is the same. Data frames of the MAC layer are synchronized and have four stages: namely a request to send (RTS) competing stage, a clear to send (CTS) emitting stage, a data (DATA) emitting stage and an acknowledgement (ACK) emitting stage, which are closely associated and cannot be separated. RTS signal packets in the method are emitted in a competition manner and CTS signal packets are synchronously emitted so as to shorten interactive time for RTS and CTS. The number of the data packets which can be emitted by each node is derived by a method for bilaterally allocating the data packets, so the problem of node hiding is solved and the capacity of the network is greatly expanded.

The invention provides a resonance derivative ring. The resonance derivative ring is a closed ring resonator formed by an equivalent inductor L and an equivalent capacitor C in a series connection mode, namely the two ends of the equivalent inductor L are respectively connected with two electrodes of the equivalent capacitor C to form an LC resonance same loop which has the functions of absorbing electric energy and then emitting the electric energy. The resonance derivative ring has various forming modes and various energy coupling modes, any two connecting points of the resonance derivative ring can output the electric energy, and the work of the resonance derivative ring is controllable. Various achieving modes of the resonance derivative ring are provided, the energy on the resonance derivative ring can be effectively controlled and output, the power and the efficiency of wireless power supply based on electromagnetic resonance are improved, and the distance of the wireless power supply based on the electromagnetic resonance is prolonged. The resonance derivative ring can be widely used for non-contact wireless power supply in industrial work, agricultural work or even daily work.

The embodiment of the invention discloses a device for improving the photo-communication reliability. The device comprises at least two different transmitting lenses, wherein the transmitting lenses comprise a first transmitting lens and a second transmitting lens; the spatial transmitting angle of the first transmitting lens is 1.3-1.7 milliradian; and the spatial transmitting angle of the second transmitting lens is 1.8-2.2 milliradian. The embodiment of the invention further discloses a system for improving the photo-communication reliability. By utilizing the device and the system which are disclosed by the invention, the light transmission range and the receiving power of a receiving terminal are increased and the photo-communication stability and reliability are improved on the premise of ensuring that a communication link is connected.

The invention discloses a fast data transmission protocol for auxiliary communication of an intelligent reflecting surface, and aims to solve the problem of huge pilot frequency overhead caused by the fact that complete channel information needs to be obtained when the optimal reflection coefficient of the existing intelligent reflecting surface is adjusted. According to the invention, the reflection coefficient enabling the expected power of the received signal to be maximum is calculated by using the incomplete channel information estimated by the receiving end, and the related reflection coefficient is configured during the next pilot frequency or data transmission, so that the effect of gradually increasing the instantaneous receiving power of the receiving end can be achieved. According to the invention, the transmitting end can start data communication as soon as possible, and the pilot frequency overhead is reduced.

The present disclosure provides a method and device in a User Equipment (UE) and a base station used for wireless communications. The UE receives first information, the first information being used to indicate a first time-domain resource and a second time-domain resource in a first sub-band, wherein the first time-domain resource is reserved for a first radio signal; performs a first access detection to determine whether to transmit the first radio signal on the first time-domain resource in the first sub-band; and transmits the first radio signal on the first time-domain resource in the first sub-band, and does not transmit any radio signal on a reserved time-domain resource in the first sub-band; or, the UE drops transmitting the first radio signal on the first time-domain resource in the first sub-band. The reserved time-domain resource is located between the first time-domain resource and the second time-domain resource in time domain.

The invention relates to the technical field of an antenna transceiver, and provides an optimization method for an antenna transceiver device containing polarization parameters. Phases of two polarization components contained in a transceiver antenna are taken as dependent variables, and the phases include a spatial polarization angle and a time phase. Finally, a relational expression between transmission loss of the antenna transceiver and the dependent variables is obtained, and the phases of the transceiver antenna are optimized according to the relational expression to reduce the transmission loss of the transceiver antenna. The method solves defects that the antenna transmission loss obtained from antenna transmission calculation by using a traditional Friss formula is small. According to the method, a plurality of sets of transceiver antenna parameters which can achieve maximum receiving power can be obtained, and the antenna can be optimized according to the parameters.

The invention relates to a target missile assembly detection system and a method. The system comprises an oscillograph, a PIN modulator, a voltage controlled oscillator, a power amplifier, a circulator, a detecting head, a microwave unreflected chamber and an antenna, wherein the antenna extends into the microwave unreflected chamber from the antenna mounting port of the microwave unreflected chamber. The method comprises the following steps: after the amplitude-modulated waves, which are emitted by the antenna, are reflected by a luneberg lens in a target missile and are received by the antenna, inputting the waves to the detecting head by the circulator to detect the amplitude; inputting the detection result to the oscillograph to be displayed, thereby obtaining the oscillograph output level which reflects the position of the luneberg lens of the detected target missile; checking whether the oscillograph output level is within the range of 160-195 mV; if so, judging that the luneberg lens is placed in a proper position; and if the level is equal to the critical values of the range or beyond the range, judging that the luneberg lens is not placed in the proper position. The invention can be used for effectively detecting whether the luneberg lens is placed in the proper position on the target missile. The system has the advantages of compact structure, light weight, low cost and stable detection performance.