385results about How to "Reduce transmission efficiency" patented technology

A wireless communication system, wherein packet transmission operations are carried out in an infrastructure mode, includes: a first terminal station serving as a data transmission source; a second terminal station serving as a data receiving destination; and a control station configured to contain each terminal station and relay a packet transmitted between the two terminal stations; wherein the first terminal station transmits a packet addressed to the second terminal station via the control station, and detects that the second terminal station is within range capable of a direct link, based on the first terminal station receiving a confirmation response packet replied from the second terminal station, the confirmation response packet being replied from the second terminal station upon a predetermined period of time having passed from the time of the control station transferring the packet to the second terminal station address.

Provided is an antenna coil capable of forming a magnetic field in a desired direction in an efficient manner, while suppressing leakage of magnetic flux into a space other than the space in which the magnetic field is formed. The antenna coil includes a main coil portion formed by winding a length of conductor wire around a first reference axis and an auxiliary coil portion formed by winding the conductor wire around a second reference axis. The second reference axis is set to intersect the magnetic flux of the main coil portion at an axial end of the auxiliary coil portion. The main coil portion and the auxiliary coil portion are connected to together form a closed circuit.

An electric machine and a power supply system, in which a battery pack can be easily and safely replaced with another, and electric power can be transferred with high transfer efficiency. An electric machine of the present invention includes a driving electric motor, a battery pack for supplying electric power to the driving electric motor, and an energy transfer section for transferring electric energy output from the battery pack to the driving electric motor. The battery pack includes a first antenna for receiving electric power from a power supply source located outside the electric machine by coupling with a first resonant magnetic field generated by the power supply source, at least one secondary battery charged by the electric power received by the first antenna, an oscillator for producing radio-frequency power by DC power discharged from the secondary battery, and a second antenna for generating a second resonant magnetic field by the radio-frequency power. The energy transfer section includes a third antenna that couples with the second resonant magnetic field generated by the second antenna, and transfers the radio-frequency power received by the third antenna to the driving electric motor.

A magnetic circuit for a non-contact charging apparatus comprising a coil, a coil yoke disposed on the rear surface side of the coil, and a magnetic attraction means disposed in a hole of the coil yoke with a magnetic gap in plane and / or thickness directions.

Method, system and computer program product for providing additional information to a handheld device (HHD) about a displayed point of interest in video programming displayed on a multimedia display. A image of the video programming captured by a HHD camera can be used at a remote server to identify the video programming by matching it with archived programming. If identified, additional information related to the video programming can be obtained / provided. A region within a particular frame of displayed video programming can be selected at the HHD to access additional information about a point of interest associated with the region. The additional information can be displayed on the HHD or a secondary display, in response to selecting the region to access the additional information from a remote server.

A pre-vaporization formulation for an e-vaping device includes a vapor former, optionally water, nicotine, nicotine bitartrate and an acid. The pH of the pre-vaporization formulation is between about 4 and about 6. The acid can include one or more of pyruvic acid, formic acid, oxalic acid, glycolic acid, acetic acid, isovaleric acid, valeric acid, propionic acid, octanoic acid, lactic acid, sorbic acid, malic acid, tartaric acid, succinic acid, citric acid, benzoic acid, oleic acid, aconitic acid, butyric acid, cinnamic acid, decanoic acid, 3,7-diemthyl-6-octenoic acid, 1-glutamic acid, heptanoic acid, hexanoic acid, 3-hexenoic acid, trans-2-hexenoic acid, isobutyric acid, lauric acid, 2-methylbutyric acid, 2-methylvaleric acid, myristic acid, nonanoic acid, palmitic acid, 4-pentenoic acid, phenylacetic acid, 3-phenylpropionic acid, hydrochloric acid, phosphoric acid and sulfuric acid.

The utility model relates to a virtual network card communication device used for mutual communication between terminals of different local area networks, which belongs to the technical field of virtual network card communication in the field of computer communication. Including: the real network cards NICA and NICB on the two terminals, the function is to perform real network data receiving and forwarding work to the outside world, which is the basis for the work of the virtual network card; virtual network cards NIC_SIMA and NIC_SIMB, which provide virtual addresses for upper-layer applications, upper-layer applications When using the virtual address to communicate with the other party, the TCP / IP data packet flows through the virtual network card, and the virtual network card software converts the virtual address into a real communication address, and communicates with the other party through the real network card assigned the communication address; the address server S, As an intermediary for the communication between two virtual network cards, it coordinates the two virtual network cards to establish a communication process step by step; the real network card exists in the hardware device of the terminal as a real physical device of the terminal, and the virtual network card exists as a resident program on the terminal.

In a transmission apparatus which multicarrier-modulates and transmits symbols, which are basic units of digital signals, a subcarrier in which a symbol is arranged in a first multicarrier symbol having a first guard interval and a subcarrier in which a symbol is arranged in a second multicarrier symbol having a second guard interval longer than the first guard interval are scattered among a plurality of subcarriers constituting a multicarrier at the same time. Therefore, it is possible to improve the resistance to inter-symbol interference without substantially degrading transmission efficiency.

A power receiving device includes a resonant coil, an electromagnetic coupling coil, a rectifier circuit, a smoothing circuit, a voltage converter circuit which converts a voltage value of DC power into another voltage value, a control circuit which obtains voltage and current values of the DC power input to the voltage converter circuit, calculates an impedance from the obtained voltage and current values, and generates a pulse width modulation signal for controlling an output voltage and an output current of the voltage converter circuit, and a load to which the output voltage and the output current of the voltage converter circuit are input. The duty ratio of the pulse width modulation signal is determined so that the impedance calculated by the control circuit becomes close to an impedance for the maximum efficiency in transferring the AC power. The power receiving device is included in a contactless power feeding system.

A method for producing an electrophotographic toner including forming a toner base particle by emulsifying or dispersing a solution or dispersion of a toner material comprising a colorant, and any one of a binder resin and a binder resin precursor in an aqueous medium, and adding crystalline organic fine particles having an acid value of 20 mgKOH / g to 80 mgKOH / g into the aqueous medium, before, during or after the forming so as to attach the crystalline organic fine particles onto a surface of the toner base particle.

A method for transmitting safety message based on vehicular applied to vehicle-vehicle communication comprising a transmitting side and a receiving side. S1, transmitting a wireless access service announcement information in a conventional vehicle environment to the receiving side, the wireless access service announcement information carrying a temporary safety message transmission channel identifier; S2, transmitting the safety message, and when the a control channel interval is analyzed to have remaining transmissible bytes, dividing the safety message into a first segment to which a remaining packet mark is appended and a second segment to which a remaining packet mark is not appended, transmitting the first segment to the receiving side during the control channel interval, and transmitting the second segment to the receiving side during service channel interval; and S3, returning to a conventional message transmission state, and continuing transmitting information.

The invention provides a power transmission apparatus for vehicle which can realize a high torque transmission efficiency and a high reduction gear ratio of a reduction gear unit with a more compact structure, and a vehicle-driving electric machinery system using the power transmission apparatus for vehicle. The power transmission apparatus for vehicle comprises a motor, a reduction gear unit for decelerating power outputted from the motor, and a differential gear unit for distributing the power decelerated by the reduction gear unit to left and right wheels. The reduction gear unit is a reduction gear mechanism including a plurality of gears mounted over a shaft which is rotatably held by a housing in a fixed position. The reduction gear unit and the differential gear unit are arranged within an area in oppositely facing relation to an axial end surface of the motor.

The invention provides a measurement device independent quantum key distribution system and method. Polarization scrambling is carried out on polarization states of light pulse signals or light quantum signals at quantum state preparation sending ends, so the polarization states of the light pulse signals or the light quantum signals are uniformly distributed on the surface of a Poincare sphere, and the two ways of polarization scrambled light pulse signals or light quantum signals are transmitted to a measuring end for Bell state projection measurement through independent optical channels. At the measuring end, each way of light quantum signal is separated into two orthogonal polarization components, the polarization directions of the two ways of orthogonal polarization components are the same, and the Bell state projection measurement is carried out on the polarization components with the same polarization direction.

The invention relates to a device for culturing microalgae. The device comprises an algae liquid storage unit, an algae liquid conveying device and an algae liquid guide surface, wherein algae liquid stored in the algae liquid storage unit forms an algae liquid area; the algae liquid guide surface is high than the liquid level of the algae liquid area in the algae liquid storage unit; the algae liquid conveying device conveys the algae liquid of the algae liquid area in the algae liquid storage unit to the algae liquid guide surface; the algae liquid forms a flowing algae liquid layer on the algae liquid guide surface and receives the irradiation of the sun; and the algae liquid flows out of the algae liquid guide surface and falls into the algae liquid area in the algae liquid storage unit. The device provided by the invention can be used for culturing the microalgae with large scale, low cost and high efficiency.

The invention discloses a carrier synchronizer for demodulating low signal-to-noise ratio burst signals. The carrier synchronizer comprises an input cache module, an initial frequency deviation estimation module, a frequency deviation partition preset module, N two-way capture tracking modules, N unwrapping phase ambiguity and soft de-mapping modules, an iterative decoding module and an optimal judgment module. Each two-way capture tracking module corresponds to one unwrapping phase ambiguity and soft de-mapping module. Initial frequency deviation is estimated based on preceding heads of the burst signals, then, after an initial frequency deviation estimation result is preset in a partition mode, two-way capture tracking is utilized to conduct carrier synchronization, the optimal judgment module selects an optimal carrier to conduct synchronous output according to judgment soft information statistical values output by the iterative decoding module, and eventually the iterative decoding module conducts decoding on the carrier and outputs a final result. By the adoption of the carrier synchronizer, optimization design is conducted on burst signal carrier synchronization under the low signal-to-noise ratio, and the problem of low signal-to-noise ratio carrier synchronization of TDMA system communication is solved.

A solid-state image pickup device comprises: a semiconductor substrate; at least one photoelectric converting film that generates signal charges corresponding to an amount of incident light; at least one set of pixel electrode films arranged in row and column directions and attached to said at least one photoelectric converting film; vertical transfer paths in the semiconductor substrate, extended in the column direction; and charge accumulating portions in the surface portion of the semiconductor substrate that accumulate signal charges from the pixel electrode films, wherein the charge accumulating portions comprise a plurality of sets, each comprising a subset of the charge accumulating portions arranged in the column direction, and wherein the subset reads out the accumulated signal charges to the corresponding one of the vertical transfer paths, and wherein the two adjacent subsets of the charge accumulating portions are shifted to each other in a direction along the vertical transfer paths.

A wireless power transmission system transmits power from a power transmitting apparatus to a relay power receiving apparatus by applying voltage to an active electrode in the power transmitting apparatus, which is opposed to an active electrode in the relay power receiving apparatus, and a passive electrode in the power transmitting apparatus, which is opposed to a passive electrode in the relay power receiving apparatus.

The invention discloses a method and device in narrowband wireless transmission. In one embodiment, UE receives a downgoing signal firstly, and the bandwidth occupied by the downgoing signal in a time window is smaller than or equal to 180 kHz; and then the UE sends an upgoing RS, and the bandwidth occupied by the upgoing RS in a time window is smaller than or equal to 180 kHz. The downgoing sign indicates a first target position, and the first target position comprises the time domain position of the time frequency resource occupied by the upgoing RS in the time window. The downgoing signal comprises a high-level signal. The upgoing RS occupies T time windows in the time domain, and occupies M narrowband symbol sets in the time windows, each narrowband symbol set includes Q narrowband symbols, and the upgoing RS occupies L1 subcarriers on each narrowband symbol in the M narrowband symbol sets. According to the invention, interference among cells is reduced, the channel estimation performance is improved, and redundancy of the upgoing RS is reduced.

The present invention discloses a method for reducing the signal peak-to-average ratio in an FBMC system. According to the method, firstly, a signal is pre-processed at a signal transmission end and the data overlapping condition is avoided even after data are multiplied by a phase rotation factor after being subjected to constellation mapping. Secondly, in combination with the conventional PTS method, data are partitioned, and a set of data smallest in peak-to-average ratio among multiple sets of data is selected and transmitted. Therefore, the signal peak-to-average ratio is well reduced. Meanwhile, the signal demodulation is conducted at a receiving end according to the discriminant rule of signals. In this way, the transmission of the sideband information is avoided. According to the technical scheme of the invention, the peak-to-average power ratio of the FBMC system is reduced, while the information demodulation of the receiving end is enabled without the transmission of the phase rotation factor. Under the same condition, the utilization rate of spectrum resources is improved and the use efficiency of the entire system is increased.

The invention relates to an optimization design method for a high-power-density 2K-H planetary gear train. The 2K-H planetary gear train comprises a sun gear, n planetary gears and an inner gear. The method comprises the following steps of according to known variables and design variables, calculating a tooth number of each planetary gear; calculating a tooth number of the inner gear; calculating the volume of the sun gear; calculating the volume of each planetary gear; calculating the volume of the inner gear; calculating transmission efficiency of the sun gear and the planetary gears in a change gear train; calculating transmission efficiency of the planetary gears and the inner gear in the change gear train; calculating the volume of the 2K-H planetary gear train; calculating transmission efficiency of the 2K-H planetary gear train; and by taking minimum volume of the 2K-H planetary gear train and minimum transmission efficiency loss of the 2K-H planetary gear train as optimization objective functions, performing optimization iteration, thereby finishing the design of the high-power-density 2K-H planetary gear train. According to the method, the volume of the 2K-H planetary gear train can be reduced and the transmission efficiency of the 2K-H planetary gear train can be improved.

The invention provides an electric vehicle variable speed drive hub, and belongs to the technical field of machine engineering. The electric vehicle variable speed drive hub solves the problem that an existing electric vehicle variable speed drive hub is poor in heat dissipation performance, loud in noise and low in output efficiency. The electric vehicle variable speed drive hub comprises a fixing shaft, a hub steel ring, a motor and a speed reducer, wherein the hub steel ring is positioned on the fixing shaft; the speed reducer is located in the hub steel ring, and the motor is located on one side of the speed reducer and located outside the hub steel ring; the motor is composed of a stator and a rotor, the stator is fixedly connected with the fixing shaft, and the rotor is positioned on the fixing shaft; the speed reducer comprises a box body, an input gear shaft, an output gear shaft and an overrun clutch, the box is fixedly connected with the fixing shaft, the input gear shaft is connected with the rotor, and the output gear shaft is fixedly connected with the hub steel ring; the rotor and the hub steel ring are connected through the overrun clutch. The electric vehicle variable speed drive hub has the advantages of being good in heat dissipation effect, high in universality and low in noise.

An object of the present invention is to provide a power supplying system able to supply electric power with high efficiency from a power supplying section to a power receiving section by suppressing a reduction of transmission efficiency caused by a gap between central axes of a power supplying coil and a power receiving coil. Two power supplying helical coils are provided. When a power receiving coil is arranged opposite to the power supplying helical coils with a gap in an axis direction thereof, electric power is transmitted from the power supplying helical coils by electromagnetic resonance. A CPU detects one closest to the power receiving coil of two power supplying helical coils as an adjacent coil, and controls on / off of the switches so as to supply the electric power to only the adjacent coil.

In a transmission apparatus which multicarrier-modulates and transmits symbols, which are basic units of digital signals, a subcarrier in which a symbol is arranged in a first multicarrier symbol having a first guard interval and a subcarrier in which a symbol is arranged in a second multicarrier symbol having a second guard interval longer than the first guard interval are scattered among a plurality of subcarriers constituting a multicarrier at the same time. Therefore, it is possible to improve the resistance to inter-symbol interference without substantially degrading transmission efficiency.

A method of determining a tone-specific information with a tone index for a transmitter or a receiver in a communication system is disclosed. The method comprises selecting at least one base tone index from a plurality of base tone indices according to at least one relation between the tone index and the at least one base tone index, and generating the tone allocation according to at least one base tone allocation with the at least one base tone index of a plurality of base tone allocations, and the at least one relation between the tone index and the at least one base tone index; wherein a base tone map comprises the plurality of base tone indices and the plurality of base tone allocations.

The invention discloses a time domain balance method for a plurality of paths of orthogonal modulation signals. The method is implemented through a plurality of decision feedback balancers having the same structures. The decision feedback balancers construct a balancer group, wherein the number of the decision feedback balancers is the same as the number of paths of orthogonal modulation signals; each decision feedback balancer consists of a feed-forward filter, a feedback filter and a symbol detector. The method comprises the following steps: receiving a training sequence by using one of the decision feedback balancers, performing initial parameter iteration training, transmitting the coefficient of the feed-forward filter to the remaining feed-forward filters when a mode switching condition is satisfied, and transmitting the coefficient of the feedback filter to the remaining parallel feedback filters to rapidly realize initialization of all decision feedback balancers; switching the balancer group from a training mode to a decision guide mode, and entering a tracking stage; at the tracking stage, performing further iteration on parameters by adopting a decision directed algorithm independent of the training sequence till convergence; in the process, performing parameter adjustment through each decision feedback balancer according to a modulation signal passing through a channel.

Weighted addition in point to point between data at back Ng points in OFDM original data and training sequence at transmitting end of OFDM system constitutes guard gap. OFDM original data is unchanged. Fusion algorithm is utilized in the receiving end of OFDM system. Correlativity between data in guard gap and data at back Ng points in OFDM original data as well as correlativity induced by the training sequence are utilized synthetically to process the received data for realizing time and frequency synchronism. The invention makes OFDM system possess good synchronous performance as well as has advantages of small interference on data caused by training sequence.

A method, device, and system for transferring a Service Control Signalling Path are provided. The method for transferring a Service Control Signalling Path includes: establishing a connection with an opposite end by a User Equipment (UE), where the UE uses a Circuit Switched (CS) bearer in a CS network and a Service Control Signalling Path in a first Packet Switched (PS) network; sending a transfer request via a second PS network, to instruct a network side to transfer the Service Control Signalling Path according to the transfer request. Thus, the UE can replace a current Gm reference point with a Gm reference point of a new and available PS network when the PS network where the current Gm reference point is located is unavailable, so as to ensure smooth data transmission.

At a transfer electrode to which a normally low transfer pulse is applied, the time period in which the negative potential is applied is long, and an electric field is applied to a gate insulating film, such that the device reliability can decrease. To overcome this drawback, a negative side potential (VL′) of a normally low vertical transfer pulse (Vφ3, Vφ4) is set smaller in the absolute value than a negative side potential (VL) of a normally high vertical transfer pulse (Vφ1, Vφ2). Thereby, while the influence of increase in the dark current is being suppressed, the electric field applying to the gate insulating film is reduced.