Hitachi, Ltd.

Hitachi-kokusai Electric Inc.

Kddi Corporation

Katsuhiko Tsunehara

Takashi Yano

Mikio Kuwahara

Nobukazu Doi

Kenzaburo Fujishima

Tomoaki Ishifuji

Takaki Uta

Hirotake Ishii

Koji Watanabe

Satoshi Tamaki

Atsushi Ogino

Hideya Suzuki

Ryota Yamasaki

Keiji Hasegawa

Takashi Ishikawa

Toshiro Suzuki

Masaaki Shida

Manabu Kawabe

Yunjian Jia

May Takada

Ayumu Koide

Shinya Sasaki

Toru Tanaka

Daisuke Matsubara

Toshinori Suzuki

Masashi Yano

Seishi Hanaoka

Shinichi Kawamoto

Tomonori Yamamoto

Koki Uwano

Yuuichi Suginishi

Hajime Kanzaki

Go Ono

Hisato Iwai

Naoto Matsuzawa

Pinai Linwong

A work instruction system includes: a production progress management device including a communication unit configured to communicate with a work instruction device, a product signal storage unit that stores a product signal including position information of a product, a product in-progress process estimation unit configured to estimate an in-progress process of the product using the position information, and a production progress estimation and update unit configured to estimate production progress of the product in accordance with a change in the position information and update production progress information; and the work instruction device including a communication unit configured to communicate with the production progress management device, a production progress storage unit that stores the production progress information, a data collection unit configured to obtain progress management information updated from the production progress management device, a recommended work generation unit configured to generate recommended work information, and an output unit.

Work instruction system and work instruction method

Provided is a wireless communication system which includes a wireless communication unit using plural frequency bands and plural antennas. The system changes the transmission power of each antenna, based on the interference of each of the frequency bands from the neighbor base station along the antenna direction. The system estimates the number of antennas necessary for transmission in response to a user requirement, and determines a necessary antenna in accordance with the antenna direction in which the terminal is located, and further changes the transmission power of each antenna.

Wireless base station for controlling antenna transmission power

A discontinuous change in a transmission timing in a time domain, which is caused by a transmission timing adjustment processing of an OFDMA uplink or the like, brings about a discontinuous rotation of a signal phase in a frequency domain, resulting in reduced communication quality. A wireless communication system of the present invention allows the signal phase of the frequency domain in a receiving station to be continuous before and after the timing adjustment processings by controlling a signal sequence in a transmission signal after conversion in the time domain in synchronization with the timing adjustment processing.

Timing adjustment method, receiving station, and transmitting station in wireless communication system, and wireless communication system

To control the communication quality on the terminal basis without making the base station more complicated, it is provided a communication system, comprising at least one computer and a gateway that is connected to the at least one computer through a first network. The gateway is connected to at least one terminal through a second network. The at least one terminal performs communications with the at least one computer via the gateway. The gateway estimates quality of the communications between the gateway and the at least one computer in the first network; and determines a priority for the communications between the gateway and the at least one terminal in the second network according to the estimated quality of the communications in the first network.

Communication system and gateway apparatus

A radio communications system includes at least one terminal communication unit having one antenna that conducts a radio communication with a plurality of terminals; and at least one baseband modem that generates and decrypts a data signal, a cell being configured by at least one of the antenna, wherein the baseband modem divides a radio frequency band used for the radio communication into two or more subbands, generates and decrypts the data signal specific to each of the divided subbands, and allocates the data signal specific to the subband to the terminal communication unit, and wherein the terminal communication unit receives the data signal specific to the subband generated by the baseband modem, and forms the cell of each the subband by the data signal specific to the received subband.

Radio communications system

The error correction capability for wireless communication carried out involving propagation path fluctuation in time and frequency selectivity can be improved. A soft decision likelihood value inputted to an error correction decoder is multiplied by a weight determined according to the distance between the data symbol and pilot symbol corresponding to the soft decision likelihood value. Namely, the soft decision bit likelihood value corresponding to the data symbol is weighted according to the distances in time or frequency between the pilot symbol and data symbol. The weight is made smaller when the distance in time or frequency is larger.

Wireless communication system, receiver and signal processing method for received signal

A wireless communication equipment includes receive processing and transmit processing. The receive processing includes a Fourier transform unit that transforms all received signals to frequency region signals by Fourier transform. A demodulation unit demodulates the received signals from the Fourier-transformed frequency region signals. A random access detection unit that monitors signals in frequency regions of random access signals of the Fourier-transformed frequency region signals, and detects that the random access signals are received, by a change pattern of the signals in the frequency regions of random access signals in one transmission time interval.

Wireless communications equipments with function of detecting random access signal, wireless communications systems with function of detecting random access signal and method of random access signal detection

Disclosed is the hardware construction of a radio communication apparatus that can meet advanced radio communications. A control bus for transferring control signals between a main processor and components is separated from a data bus for transferring transmission/receive signals between processor units including sub-processors and an external interface. The sub-processors constitute the processor units, and a software defined radio of the present invention may include plural processor units. The processor units are connected by a dedicated interunit interface. The processor units may include multiple sub-processors, which are connected serially through an interprocessor interface.

Radio communication apparatus with a bus dedicated to data transmission

In a cellular radio communication system, a base station or a mobile station has a TA (Time Alignment)-range-out detection function, so that when a TA-range-out state that is unable to compensate with a guard interval is detected, the transmission condition of an uplink signal at the mobile station is changed by the mobile station autonomously or by the base station and the mobile station cooperatively.

Base station and mobile station for OFDMA cellular system

By using the delay profile created by delay profile creating sectionand the first threshold valuereceived from the first threshold value calculation, the first threshold value timing detection sectionselects only the earliest receive timing exceeding the first threshold value, from all the timing that the correlation value in the delay profile becomes a maximum. By using the receive timing and the second threshold valuereceived from the second threshold value calculation section, reference timing calculation sectionselects the reference timing required for calculating the receive timing for the incoming wave of the minimum propagation delay time. The timing delayed by previously set timing behind said reference timing is sent from receive timing calculation sectionas the receive timingof the incoming wave of the minimum propagation delay time.

Method for measuring distance and position using spread spectrum signal, and an equipment using the method

A radio communication apparatus having a radio modem for processing a signal in a radio frequency band, a signal processor for processing a base band of a transmission or reception signal, and a CPU for processing a protocol. The signal processor includes signal processing blocks implemented by programmable software. Each of the signal processing blocks processes a signal of reception signal data input from the radio modem or from a preceding stage of one of the signal processing blocks or a signal of transmission signal data input from the CPU or from the preceding stage of signal processing block on the basis of a control signal input together with the transmission signal data or the reception signal data. The control signal can include information required by all the signal processing blocks in a common format.

Software defined radio and library configuration therefor

By using the delay profile created by delay profile creating sectionand the first threshold valuereceived from the first threshold value calculationthe first threshold value timing detection sectionselects only the earliest receive timing exceeding the first threshold value, from all the timing that the correlation value in the delay profile becomes a maximum. By using the receive timing and the second threshold valuereceived from the second threshold value calculation sectionreference timing calculation sectionselects the reference timing required for calculating the receive timing for the incoming wave of the minimum propagation delay time. The timing delayed by previously set timing behind said reference timing is sent from receive timing calculation sectionas the receive timingof the incoming wave of the minimum propagation delay time.

The invention provides a technique that saves rate conversion accompanying complicated calculations and shares an analog filter for anti-aliasing in a sampling device. The sampling device employs an anti-alias filter having a fixed cutoff frequency, an A/D converter and a D/A converter each having a clock signal input, which are capable of varying a sampling frequency, and a PLL circuit capable of varying the frequency of a clock signal; and it sets the sampling frequency not lower than an integral multiple of a signal bandwidth and double the cutoff frequency for sampling.

Software defined radio system

A method, system, and apparatus are provided for detecting a position of a terminal in a network accurately without a GPS receiver. In one example, a method for locating a position of a terminal includes calculating a position of a base station; detecting a clock time difference between the base station and another base station; measuring a reception timing of a signal received by the base station from the terminal; and locating the position of the terminal using at least the position of the base station, the clock time difference, and the reception timing.

Growing community of inventors

Hachioji, Japan

Katsuhiko Tsunehara