Abstract: An object of the present invention is to estimate and compensate more accurately transmission channels in CDMA signal decoding. Memory means stores received despread data. Slot position detection means detects positions of pilot symbols. Pilot symbol averaging means obtains transmission channel estimation value per pilot block, by averaging a plurality of reception channels in each pilot block. The transmission channel estimation values are delayed by delay means, multiplied by their weight and added by multi-pilot block transmission channel estimation means. Here, the weighs are controlled adaptively by weight determination means in accordance with the state of the channel. Channel compensation means compensate m-th information symbol in the n-th slot including the pilot block on the basis of the estimation values obtained by the multi-pilot block transmission channel estimation means.

Abstract: An operating state management apparatus (10) for performing centralized management of operating state data for machine tools (20) of all customers is connected to each of the machine tools (20) via a wireless communication network and the Internet (60). A service center PC (40) constantly connected to a private server (15) provided in the operating state management apparatus (10) is installed in a service center. The service center PC (40) displays a predetermined map on a large screen monitor installed in the service center. Based on the location information data of each machine tool (20) regularly supplied by e-mail, the service center PC (40) indicates, on the map, the location of each machine tool (20) as a point of a circular marker. The color of the marker can be changed depending on the operating condition of the machine tool (20).

Abstract: The invention relates to a maintenance system for machine tool. In the maintenance, system 1, a user management apparatus 10 connected to a numerical control section of a machine tool 15, and a manufacturer management apparatus 20 disposed on a side of a manufacturer are connected to each other via Internet 5. The user management apparatus 10 collects data relating to an operating condition of each driving mechanism of the machine tool 15, and accumulates the data. When a predetermined transmission condition is satisfied, the user management apparatus 10 transmits the accumulated operating condition data to the manufacturer management apparatus 20 in the form of an electronic mail. The manufacturer management apparatus 20 evaluates the consumption degree of each driving mechanism based on the received operating condition data, and outputs an alarm when the consumption degree exceeds a reference value.

Abstract: A direct sequence CDMA receiver is disclosed that includes an interpolative delay profile production unit. An A/D converter receives signals that have been received by an antenna and converted to a baseband signal and samples the signals at twice the chip rate. A matched filter finds correlation values with the received data using a spreading code of 1/−1, and the delay profile production means interpolates these correlation values by means of, for example, a filter. A timing detector selects delay profiles in descending order of size, and extracts the timings of each. A despreader interpolates the spreading code to synchronize with the timing signals, and using these interpolated values carries out despreading of the received data. A mixer carries out RAKE/diversity mixing of the despread signals.

Abstract: A transmission power control system of a mobile communications base stations controls the transmission power level of a mobile station. A mobile station receives a transmission power control command transmitted over a forward-link from a base station for making a reception condition of a reverse-link at the base station substantially fixed. A reception quality estimation section of the mobile station estimates the reception quality of the transmission power control command, and a transmission power control section controls the transmission power with a control width which is varied in response to the reception quality estimated by the reception quality estimation section. If the communication conditions of the forward-link becomes unfavorable, the transmission power of the mobile station is prevented from being displaced by a significant amount in a direction different from the last instruction from the base station.

Abstract: The invention relates to a maintenance system for machine tool. In the maintenance system 1, a user management apparatus 10 connected to a numerical control section of a machine tool 15, and a manufacturer management apparatus 20 disposed on a side of a manufacturer are connected to each other via Internet 5. The user management apparatus 10 collects data relating to an operating condition of each driving mechanism of the machine tool 15, and accumulates the data. When a predetermined transmission condition is satisfied, the user management apparatus 10 transmits the accumulated operating condition data to the manufacturer management apparatus 20 in the form of an electronic mail. The manufacturer management apparatus 20 evaluates the consumption degree of each driving mechanism based on the received operating condition data, and outputs an alarm when the consumption degree exceeds a reference value.

Abstract: The mobile terminal of the present invention receives signals from the base station which receives the control command from the mobile terminal and executes, on the basis of the control command, the antenna switching transmission diversity. The mobile terminal includes: a reception unit for receiving downward signal from the base station; a downward link estimation unit for estimating the downward link on the basis of the received downward signal; an upward link estimation unit for estimating the upward link on the basis of the received downward signal; a base station estimation unit for estimating a state of the base station on the basis of the outputs from the downward estimation unit and the upward estimation unit; and a demodulator unit for demodulating the received signal on the basis of the output from the base station estimation unit.

Abstract: An operation management system 1 according to the present invention is configured so as to connect an operation data accumulation and transmission device 10 connected to an NC unit 16 to an operation management device via telecommunication circuits 20. The operation data collection and transmission device 10 collects data on an operating condition of a machine tool 15 to store the same in an operation data storage section 12, and based on the accumulated operating condition data, generates transmit data with a configuration for associating a data-element identifier which defines an item concerning operating condition with operating condition data corresponding to this item to transmit the same to the operation management device. The operation management device analyzes the data-element identifier of the received data, recognizes the operating condition item and updates the operating condition data in databases corresponding to the recognized item by the received operating condition data.

Abstract: An operation management system 1 according to the present invention is configured so as to connect an operation data accumulation and transmission device 10 connected to an NC unit 16 to an operation management device via telecommunication circuits 20. The operation data collection and transmission device 10 collects data on an operating condition of a machine tool 15 to store the same in an operation data storage section 12, and based on the accumulated operating condition data, generates transmit data with a configuration for associating a data-element identifier which defines an item concerning operating condition with operating condition data corresponding to this item to transmit the same to the operation management device. The operation management device analyzes the data-element identifier of the received data, recognizes the operating condition item and updates the operating condition data in databases corresponding to the recognized item by the received operating condition data.

Abstract: To improve a capacity of coherent detection of the spread spectrum (SS) signal, when interference and noise can not be neglected. Amplitude phase estimation unit outputs transmission line estimation value including fluctuations in the transmission lines, using known pilot signals of which transmission sequences are known. The pilot signal is extracted from the despread signal through despreading filter. Reliability measurement unit pursues a reliability value of transmission line estimation value. Interpolation unit generates vectors for compensating the phase, by deciding a method of interpolation on the basis of the reliability. Coherent detection unit compensates the amplitude and phase of information symbol to execute the coherent detection.

Abstract: A method for recovering a liquid substance such as fuel oil from ships sunk or stranded due to marine accidents and from storage facilities by more easily heating the liquid substance to reduce its viscosity, and a device for recovering liquid substance. A working coil (2) is applied to the inner bottom plate (7) of a conductive tank (6) in contact with the liquid substance to be recovered, a high-frequency current is supplied to the working coil (2) from a high-frequency inverter unit (3) to heat the inner bottom plate (7) itself by induction heating and the liquid substance is reduced in viscosity by the heating for recovery via a recovery pipe (5) connected to a pump (4).

Abstract: To perform a transmission diversity control in a best state by monitoring a transmission line state of an up-link and a transmission line state of a down-link.

Abstract: This invention is to prevent deterioration in communication quality of closed loop transmission power control, which may occur when the change in transmission power cannot keep up with a sudden change in the state of a transmission path. Transmission power control command extractor 4 extracts a transmission power control command from the uplink signal that has been received by receiver 2. Mobile position predictor 7 predicts the future position of the mobile station from its present position as recognized by mobile position recognizer 5 and from its present rate of movement as recognized by mobile velocity recognizer 6. Database 8 records the state of the downlink transmission path as a function of mobile position. Transmission power controller 9 looks up database 8 on the basis of the predicted future position of the mobile station and controls the downlink transmission power of base station BS on the basis of (i) the result of this lookup, and (ii) the transmission power control command.

Abstract: A CDMA receiving apparatus is newly provided with a profile calculator 107 for calculating a profile of a reception signal and a tap controller 108 for determining the number of needed taps and the timing from the profile. An adaptive despreading filter 110 for performing filter processing on a reception signal r, an autocorrelative inverse matrix calculator 113 and an adaptive controller 111 for controlling a filter coefficient of an adaptive despreading filter receive an instruction of the tap length and the timing from the tap controller 10 to calculate only the tap position determined.

Abstract: The mobile terminal of the present invention receives signals from the base station which receives the control command from the mobile terminal and executes, on the basis of the control command, the antenna switching transmission diversity. The mobile terminal includes: a reception unit for receiving downward signal from the base station; a downward link estimation unit for estimating the downward link on the basis of the received downward signal; an upward link estimation unit for estimating the upward link on the basis of the received downward signal; a base station estimation unit for estimating a state of the base station on the basis of the outputs from the downward estimation unit and the upward estimation unit; and a demodulator unit for demodulating the received signal on the basis of the output from the base station estimation unit.

Abstract: An object of the present invention is to estimate and compensate more accurately transmission channels in CDMA signal decoding. Memory means stores received despread data. Slot position detection means detects positions of pilot symbols. Pilot symbol averaging means obtains transmission channel estimation value per pilot block, by averaging a plurality of reception channels in each pilot block. The transmission channel estimation values are delayed by delay means, multiplied by their weight and added by multi-pilot block transmission channel estimation means. Here, the weighs are controlled adaptively by weight determination means in accordance with the state of the channel. Channel compensation means compensate m-th information symbol in the n-th slot including the pilot block on the basis of the estimation values obtained by the multi-pilot block transmission channel estimation means.

Abstract: A transmission power control system is disclosed which can control the transmission level of a mobile station so that the reception condition in the reverse-link may be fixed without the necessity to increase the number of bits of a command for instruction to raise or lower the transmission level or without raising the transmission power of a command. A mobile station receives a transmission power control command transmitted over a forward-link from a base station for making a reception condition of a reverse-link at the base station substantially fixed. A reception quality estimation section of the mobile station estimates the reception quality of the transmission power control command, and a transmission power control section controls the transmission power with a control width varied in response to the reception quality estimated by the reception quality estimation section.

Abstract: A spectrum-spread signal is taken out by a mixer 11, a low pass filter 2 and a sample hold circuit 3, codes for one period of spreading codes on a transmitting side of the spectrum-spread signal is multiplied by codes for one period of previously given spreading codes on a receiving side and the summations of the multiplication are output by means of a matched filter in a correlator 4, and a symbolic integration section 6 inversely modulates known symbols of a symbol signal inversely spread at one chip interval using theoretical values, and performs symbolic integration, and in a pseudo correlation removing section 7, pseudo correlation is removed by subtracting the theoretical values of the correlation values in order of magnitude of an amplitude and in a synchronization detecting section 5, timing when the amplitude becomes to be maximum is detected as receiving timing.

Abstract: A transmission power control system suitable in use for a mobile communications system in which communications are performed through a many-valued encoding operation in which codes are represented with symbols. CIR calculating means is disposed in the transmission station and calculates a CIR by subtracting an interference signal level from a desired signal level of a transmission signal, wherein the desired signal level is obtained based on an average power of inverse-modulated pilot symbols each obtained by inverse-modulating a pilot symbol with a theoretical value of the pilot symbol, and wherein the interference signal level is obtained based on a distribution of inverse-modulated pilot symbols each obtained by inverse-modulating a pilot symbol with a theoretical value of the pilot symbol. Transmission power indicating means is disposed in the transmission station and transmits an indication for transmission power control according to the CIR of the transmission signal from the remote call station.

Abstract: According to a spread spectrum communication synchronization acquisition demodulating apparatus which can acquire synchronization timing and immediately track variation of the synchronization timing irrespective of lots of noise, in a synchronizing circuit 100, a reception signal form an antenna is converted to a base band signal in a local oscillator 1 and an LPF 2, and sampled in S/H 3. In a correlator 4, the spreading code of the reception signal is multiplied by the symbol thereof to obtain a correlation value. In a symbol integrator 5, the correlation value is demodulated on the basis of the theoretical value of the symbol corresponding to the correlation value or the judgment value after demodulation, and integrated over plural symbols to obtain a power value.