摘要:
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.
摘要:
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.
摘要:
A wireless communication system includes plural wireless base station apparatuses and plural mobile station apparatuses, in which the base station apparatuses and mobile station apparatuses are capable of communication with each other via radio resources, each base station apparatus allocates guaranteed resources to be allocated to a mobile station apparatus for a given duration for transmission/reception of data with a specified capacity among data to be transmitted/received and includes a resource allocation notification unit that notifies the mobile station apparatus of the results of allocation performed by the resource allocation unit. A wireless communication base station and a wireless mobile station in the wireless communication system are also provided.
摘要:
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.
摘要:
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.
摘要:
A cellular radio communication system includes a first mobile terminal, a base station that performs radio communication with first mobile terminals, a second mobile terminal, and a second base station that performs radio communication with second mobile terminals. In the downlink communication, the base station selects a high data rate mode when the radio interference from the base station to the second mobile terminals that are located close to an edge of a communication area of the second base station is small. The base station selects an interference mitigation mode in the downlink communication when the radio interference from the base station to the second mobile terminals that are located close to the edge of the communication area of the second base station is large. Thus, inter-cell interference control can be performed in collaboration with base stations in the radio communication system without having communication interface between the base stations.
摘要:
An imaging device (1) includes a camera unit (3) that captures images of the same object, respectively, using two optical systems, a face part detection unit (9) that detects a plurality of face parts composing a face included in each of the images captured by the camera unit (3), a face part luminance calculation unit (10) that calculates luminance of the detected plurality of face parts, and an exposure control value determination unit (12) that determines an exposure control value of the camera unit (3) based on the luminance of the plurality of face parts. A distance measurement unit (17) in the imaging device (1) measures distances to the face parts based on the images captured by the camera unit (3) using the exposure control value. Thus, the imaging device (1) can measure the distances to the face parts with high accuracy.
摘要:
A subchannel scheduling method in a multi-user MIMO-OFDM environment modifies proportional fairness scheduling specifications and maximizes a system throughput under conditions that a minimum data transmission rate required by a multimedia user be ensured. In a method for allocating subchannels in a wireless network, plural users are subscribed in the wireless network, a base station has NT transmission antennas, a user i has NR reception antennas, a network capacity determined by the NT transmission antennas and K subcarrier groups is divided into K transmission subchannel groups, and a network bandwidth determined by the NT transmission antennas is divided into the K subchannel groups. The base station sequentially allocates channels to the users on the basis of a proportional value of a data transmission rate supported to each user and an average throughput of each user in a predetermined time and a service quality required by each user.
摘要:
A driver monitoring apparatus that detects a face orientation of a driver with sufficient accuracy without setting a long base-line length for a camera and without being adversely affected by disturbance. The driver monitoring apparatus (10) that monitors the face orientation of the driver includes: a supplemental illuminator (22) which illuminates the driver with near-infrared light; a compound-eye camera (21) which captures images of a face of the driver, the compound-eye camera including a plurality of lenses (211a, 211b) and an imaging device (214) having imaging areas (214a, 214b) each corresponding to one of the lenses (211a, 211b); and an ECU (30) which estimate the face orientation of the driver by processing the images captured by the compound-eye camera (21) and detecting a three-dimensional position of a feature point of the face of the driver, wherein the compound-eye camera (21) is placed in such a manner that a base-line direction coincides with the vertical direction, the base-line direction being a direction in which the lenses (211a, 211b) are arranged.
摘要:
A transmitter station and receiver station have common maximum number of transmission bits per symbol of each subcarrier and information of encoding types to be selected. The transmitter station selects the modulation type from the propagation path quality of each subcarrier, executes encoding with the encoding type corresponding to the number of bits for communication with the selected modulation type, distributes the maximum number of transmission bits per symbol of each subcarrier by dividing the code, and transmits the data through modulation of only the number of bits for communication with the selected modulation type among distributed bits in each subcarrier. The receiver station executes demodulation by selecting the modulation type used for demodulation from the propagation path quality, summarizes the demodulation result with addition of reception of the signal having a zero degree of likeliness for the number of wanted bits, and executes decoding to the result of demodulation.