Abstract: Ameliorate deterioration in quality of communication caused by intercell interference with respect to a multicarrier communications protocol, such as OFDM. A method of positioning an error correction-coded signal is changed with a data symbol that is transmitted simultaneously with a pilot signal and a data symbol that is not simultaneous with the pilot symbol. Else, a modulation protocol is changed with a data symbol that is transmitted simultaneously with a pilot signal and a data symbol that is not simultaneous with the pilot symbol. It would further be permissible to lower either a signal amplitude or a power level of a data symbol that is transmitted simultaneously with a pilot signal.

Abstract: This invention provides a mobile communication system which expanded the operation limitation of the heretofore adopted mobile communication systems and improved the spectrum efficiency greatly. A data transmission method for use in the mobile communication system of the present invention includes means for channel pluralizing by which to expand the Shannon limit and means for interference reduction by which to expand the interference limit. More specifically, a transmitting module comprises M units of modulators and L units of transmitting antennas, generates L units of signals by multiplying M units of modulated signals by a complex matrix consisting of M×L units of elements, and transmits the L units of signals from the L units of transmitting antennas.

Abstract: Radio communication system and radio station which enable efficient use of radio resources while coping with a sudden change in radio communication quality are to be provided. Radio communication system includes plural radio stations. At least one of the plural radio stations allocates a part of an allocatable communication resource as one or more individual resources in which a source radio station and a destination radio station are individually set, and allocates another part of the allocatable communication resource as one or more shared resources which are used in common by plural source radio stations or plural destination radio stations. Each of the radio stations encodes a transmission signal using a systematic code, sends the transmission signal before being encoded, using the individual resource allocated to each of the radio stations, and sends a parity portion of the encoded transmission signal, using the shared resource allocated.

Abstract: A communication device includes pilot signal sending part and transmit power control part and holds a criterion value indicating target channel quality for mobile stations within the area covered by the base station. It creates quality data from reports from one or plural mobile stations, stores the quality data, creates a first representative value indicating average channel quality for the mobile station(s) from the stored quality data, and changes the transmit power depending on the result of comparison between the first representative value and the criterion value. It creates a second representative value indicating distribution of low channel quality from the stored quality data and updates the criterion value depending on the result of comparison between the second representative value and the criterion value.

Abstract: Even though a network with communication rate large fluctuations is applied to a remote monitoring system, data communication delay time is kept smaller for which a shorter communication delay time is demanded and a high throughput is implemented. A sensor equipped terminal sends measurement data to a network interconnection device. A priority level determining unit of the device sorts the data into first data necessary to be delivered to a monitoring center within requested communication delay time and second data not necessarily to be delivered to the center within requested communication delay time. A transmission buffer unit is a buffer storing the first and second data accumulated in first and second data accumulating units in sending the data to a wide area network by FIFO. A transmission control unit dynamically controls a rate in causing the data to come in the transmission buffer unit based on a network communication rate.

Abstract: Freedom for relationship between division of a signal processing unit and a pilot signal is improved in a multi-carrier communication system such as OFDM. An encoded signal is divided into resource blocks and the signals are arranged independently of the arrangement of a pilot signal. The signal arranged at the same position as the pilot signal causes a puncture upon transmission.

Abstract: Resources are assigned in units of resource blocks each composed of one or more subcarriers, inter-cell interference adjustment control information is notified to each other among base stations, a transmit power limitation on each of the resource blocks in a cell is decided based on the inter-cell interference adjustment control information; and the decision of the transmit power limitation is changed sequentially beginning at a resource block having a transmit power limitation different from the transmit power limitation on an adjacent resource block.

Abstract: An object of the invention is to provide a wireless communication system in which the load of each cell and interference between cells are taken into account. In a handover-candidate base station and a handover-source base station, parameters for interference-reducing scheduling and handover facilitating processing are adjusted based on the mutual load information. When the handover-candidate base station, to be used for load balancing, is a large-diameter cell, transmit power control and frequency scheduling are adjusted by taking account of the load state at a cell edge. When the handover-source base station has a small-diameter cell, the number of terminals to be handed over is adjusted by taking account of the load state of the handover-candidate base station. Thus, both of interference control and load balancing are achieved.

Abstract: Transmission power relative to a propagation path having a variation in gain is controlled to increase communication channel capacity, and a data rate is controlled in accordance with the variation of the increased communication channel capacity. In order to increase the communication channel capacity, the transmission power is determined so that the sum of noise power (=received noise power/propagation path gain) converted into one at a transmitter and the transmission power becomes constant. As a result, contrary to the background art, the transmission power is controlled to be reduced when the propagation path gain decreases and to be increased when the propagation path gain increases.

Abstract: A radio communication system using an orthogonal frequency division multiplexing system, including: a baseband unit; and one or plural remote radio units coupled with the baseband unit through an interface; wherein the baseband unit includes a first sample frequency conversion part that performs a first sample frequency conversion processing that down-samples a transmitting signal transmitted through the interface, wherein the remote radio unit includes a second sample frequency conversion part that performs a second sample frequency conversion processing that up-samples a signal received through the interface, and wherein the baseband unit further includes an inverse fast fourier transform part that generates the transmitting signal by an inverse fast fourier transform, and a transmitter characteristic compensation part that conducts frequency characteristic compensation of the first sample frequency conversion processing and the second sample frequency conversion processing for a signal that has not been su

Abstract: 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.

Abstract: An image pickup apparatus of the present invention includes: a lens array having a plurality of lenses; a plurality of image pickup regions disposed to correspond to the plurality of lenses one-to-one and each having a light receiving surface substantially perpendicular to a direction in which an optical axis of the corresponding lens extends; a temperature sensor (126) disposed in the vicinity of the lens array to detect a temperature; a movement distance estimating portion (139) configured to estimate movement distances of all the optical axes of the plurality of lenses based on the temperature detected by the temperature sensor (126); an image pickup signal correcting portion (135) configured to correct an image pickup signal, generated in the image pickup region, based on the movement distances estimated by the movement distance estimating portion (139); and a parallax calculating portion (142) configured to calculate a parallax based on the image pickup signal corrected by the image pickup signal correct

Abstract: An image pickup apparatus of the present invention includes: a lens array having a plurality of lenses; a plurality of image pickup regions (123) disposed to correspond to the plurality of lenses one-to-one and each including a light receiving surface substantially perpendicular to a direction in which an optical axis of the corresponding lens extends; a temperature sensor (126) disposed in the vicinity of the lens array to detect a temperature; a correction coefficient generating portion (142) configured to generate, based on the temperature, correction coefficients including correction coefficients correlated to magnifications of images taken in the image pickup regions; and a correction calculating portion (143, 144) configured to correct, based on the correction coefficients, image pickup signals generated in the image pickup regions and calculate a parallax using the corrected image pickup signals.

Abstract: Transmission power relative to a propagation path having a variation in gain is controlled to increase communication channel capacity, and a data rate is controlled in accordance with the variation of the increased communication channel capacity. In order to increase the communication channel capacity, the transmission power is determined so that the sum of noise power (=received noise power/propagation path gain) converted into one at a transmitter and the transmission power becomes constant. As a result, contrary to the background art, the transmission power is controlled to be reduced when the propagation path gain decreases and to be increased when the propagation path gain increases.

Abstract: A signal frequency of an interface signal between a baseband unit and a remote radio unit is decreased by downsampling, and the strain of the signal caused by downsampling is compensated for each subcarrier before an IFFT during transmission, and after FFT during reception.

Abstract: In a remote monitoring system including a monitoring center, a sensing information collecting station, and one or more sensing terminals, the sensing information collecting station collects measurement results measured by the sensing terminals, classifies the collected measurement results into priority information and general information, and transmits priority information and general information to the monitoring center. The monitoring center transmits response information to received priority information to the sensing information collecting station. The sensing information collecting station estimates network condition from a delay time based on the response information and decreases the transmission rate of general information when the estimated network condition is more congested. Thereby, even if the network condition fluctuates, desired information such as statistical information on measurement results and measurement results meeting a predetermined condition is communicated stably at low delay.

Abstract: A wireless communication apparatus comprising a memory for storing a group of coefficient values to be applied to processing of orthogonal modulation signals received by a plurality of antenna elements, a coefficient generation unit for detecting a phase shift value of reception timing of specific received signals on the basis of a desired signal and the coefficient values read out from the memory, compensating the group of coefficient values according to the detected phase shift value, and storing the compensated coefficient values in the memory, and a signal processing unit for processing the received signals by applying the compensated coefficient values.

Abstract: The number of thermal sensors in an imaging device that requires temperature measurement is reduced. The imaging device includes: a lens array (112) including lenses; an imaging element (122) provided at a predetermined distance from the lens array (112) and having imaging areas respectively corresponding to the lenses; a light-shielding wall (113) which partitions a space between the lens array and the imaging element so as to prevent light entering each of the lenses from reaching the imaging areas different from a corresponding one of the imaging areas; an imaging signal input unit (133) configured to generate an imaging signal by digitalizing an electric signal provided by the imaging element; and a temperature estimation unit (143) configured to calculate, from the imaging signal, a length of an image of the light-shielding wall projected on an imaging plane of the imaging element, and to estimate a temperature using the calculated length of the image of the light-shielding wall.

Abstract: Provided is a wireless communication system, comprising: a wireless communication apparatus which performs adaptive modulation for changing a modulation method and an encoding rate of a data channel, and transmits/receives a signal via MIMO multiplexing. The control information comprises first control information to be used for a MIMO stream separation process and second control information not to be used for the MIMO stream separation process. The selections in the second control information are changed corresponding to selected first control information.

Abstract: An optical filter array (2) having a plurality of optical filters (2a to 2d) and a light shielding block (6) having light shielding walls (61a to 61d) forming a plurality of openings (6a to 6d) independent from each other are placed between a lens module (7) integrally having a plurality of lenses (1a to 1d) arranged on a single plane and a plurality of imaging regions (4a to 4d). The light shielding block is provided with first sliding surfaces (66 to 69). The lens module is provided with second sliding surfaces (56 to 59) sliding on the first sliding surfaces so that the lens module can rotate with respect to the light shielding block with an axis normal to the plurality of imaging regions as a rotation center axis. Thus, a small, thin, and low-cost compound eye camera module can be realized.