Abstract: A reception apparatus obtains a first channel estimated value from a reference signal of each layer and a known reference signal that are received and multiplies the first channel estimated value by an orthogonal signal sequence in each layer. Subsequently, the reception apparatus synthesizes a signal in each layer and, from the orthogonal signal sequence and the synthesized signal, calculates an adaptive array antenna weight. Next, the reception apparatus carries out antenna synthesis of the data signal and the reference signal by using the above weight for each layer and obtains a second channel estimated value from the reference signal subjected to the synthesis. Then, the reception apparatus carries out MIMO demodulation from a result of the channel estimation for each layer described above.

Abstract: A control unit 130 assigns a first new call to a radio resource of a frequency channel with a small interference power and, when there is an available radio resource, assigns new calls after the first new call to radio resources of a frequency channel the same as, or adjacent to, the frequency channel of the radio resource of the first new call. The control unit 130, when there is no available radio resource, selects a combination of a multiplex call originator and a multiplex call receiver to which space division multiplexing may be carried out and, by calculating multiplexing priorities, selects a combination of a multiplex call originator and a multiplex call receiver having high priorities. Then, the control unit 130 generates an available radio resource by carrying out the space division multiplexing and assigns the new calls after the first new call to the generated radio resources.

Abstract: A wireless communication device includes: a plurality of antennas receiving signals transmitted from one or more transmission antennas; a synthesis calculation unit performing a synthesis calculation of respective reception signals received by the plurality of antennas and reception weights corresponding to respective antenna ports; a channel estimation unit calculating respective estimated channel values from respective synthesized signals obtained by the synthesis calculation for the respective antenna ports, and a decoding unit performing decoding from the respective estimated channel values and the synthesized signals for the respective antenna ports.

Abstract: A base station includes: a MIMO precoding section (32) for converting transmission data addressed to a mobile station to two data streams that respectively correspond to two reception antennas included in the mobile station, by performing MIMO precoding on the transmission data; a weight calculating section for calculating a transmission weight to be used for forming a directivity pattern directed toward each of the two reception antennas; and a weighting/combining section (34) for generating two combined data streams that are to be supplied to the respective antennas (20-1 and 20-2), by weighting each of the two data streams with the transmission weight calculated with respect to the reception antenna of the mobile station that corresponds to the data stream, and combining the two weighted data streams for each of the antennas (20). The two combined data streams are respectively transmitted from the antennas (20-1 and 20-2).

Abstract: A radio base station (eNB 1) receives an SRS from the radio terminal (UE 2A) and SRSes from radio terminals (UE 2B through UE 2D), and calculates, on the basis of at least one of the SRSes from the radio terminal (UE 2A) and from the radio terminals (UE 2B through UE 2D), a reception weight that is to be used for wireless communication with the radio terminal (UE 2A).

Abstract: A mobile station which performs a handover from a base station to a base station calculates the transmission loss of a broadcast control channel sent from the target base station, and corrects the transmission power of an uplink ANCH to the target base station, based on a known base station desired receive power and the calculated transmission loss. Alternatively, the mobile station may correct the transmission power of the uplink ANCH to the target base station, based on the transmission power of an uplink signal to the serving base station, the transmission loss of a downlink signal sent from the serving base station, and the transmission loss of a broadcast control channel sent from the target base station.

Abstract: A mobile station device configured to communicate with a base station device by a time division duplex (TDD) scheme, and to transmit retransmission data to the base station device by an automatic retransmission scheme in response to reception acknowledgement information transmitted from the base station device, the mobile station device including a controller configured to determine a number of frames from a reception of the reception acknowledgement information to a transmission of the retransmission data, based on a position of a reception slot within a reception frame, the reception slot including the reception acknowledgement information.

Abstract: A mobile station (12) includes an AGC unit (24) for controlling the received power of a communication signal sent from a base station via at least one of the subchannels, based on the maximum received power of a signal received together with the communication signal by any of the subchannels; a received power difference detecting unit (30) for detecting the received power difference between the maximum received power of a signal sent from the base station and the maximum received power of a signal arriving from a device different from the base station; and a modulation and coding scheme determining unit (38) for determining a modulation and coding scheme for a new communication signal to be sent from the base station, based on the signal quality of the communication signal subjected to received power control by the AGC unit (24) and the received power difference detected.

Abstract: A mobile station which performs a soft handover from a serving base station to a base station in which frame synchronization is established in the uplink direction with the base station calculates the time difference between the receive timing of a downlink signal sent from the base station and the receive timing of a broadcast control channel sent from the base station at S100 to use as a timing correct amount, and corrects the transmission timing of an uplink ANCH to the base station, based on the transmission timing of an uplink signal to the base station and the time difference calculated at S126, to thereby establish frame synchronization in the uplink direction with the base station.

Abstract: To realize prompt and efficient data communication by dynamically changing the optimum MCS and PC. A base station (120) serving as a wireless communication device according to the present invention includes an obtaining unit (220) for obtaining an RSSI and an SINR of a receive signal upon generation of transmission data to be sent to a PHS terminal (110) serving as a wireless communication device to communicate with; a modulation and coding scheme determining unit (224) for determining an MCS, based on the volume of the transmission data; a transmission power determining unit (226) for determining a transmission power, based on the volume of the transmission data, the RSSI, the SINR, and the MCS determined; and a wireless communication unit (214) for sending the transmission data, using the MCS determined and the transmission power determined.

Abstract: Provided are a radio communication system, a transmission device, and a communication signal transmission method, which enable a reception device to correctly demodulate a communication signal without performing a feedback of a propagation path characteristic from the reception device to the transmission device.

Abstract: A transmitting apparatus and a wireless communication method are provided. The transmitting apparatus is capable of transmitting, together with transmission data, retransmission data in response to an HARQ from a receiving apparatus, according to an MCS determined based on a request from the receiving apparatus and includes a storage portion which stores information indicating a transition of an FER with respect to a communication quality for each MCS in both cases in which an HARQ response is enabled and disabled, an HARQ switching portion which switches whether to enable or disable the HARQ response in accordance with a QoS class of data to be transmitted, and an MCS switching portion which switches an MCS in accordance with the switching of whether to enable or disable the HARQ response, while referring to the information stored in the storage portion.

Abstract: One of the objects of the present invention is to more completely avoid impossibility of access between a mobile station and a base station, in wireless communication using an OFDM (Orthogonal Frequency Division Multiplexing) modulation scheme. In one embodiment, a base station removes a guard interval from an OFDM symbol received from a PHS terminal through a timing correction channel at two different timings to obtain two effective symbols, calculates a timing correction amount by including one timing, at which an guard interval is removed for the effective symbol that has caused detection of one correlation peak within a predetermined timing detection range of two correlation peaks detected from the respective effective symbols, into a differential from reference timing of the base station at the time of detection of the one correlation peak, and transmits the timing correction amount to the PHS terminal by means of a timing correction burst.

Abstract: One object of the present invention is to effectively utilize adaptive modulation and improve stability of wireless communication, without departing from standards, by independently controlling MCSs of retransmission data and usual data and using MCS suitable for each data. In the wireless communication system of the present invention, a frame, in which an error occurs, in both a transmitting device and a receiving device and the error part are specified, and MCS used in the frame is specified. Therefore, it is possible to modulate/demodulate the error part based on desired MCS without loading MCS on HARQ.

Abstract: A base station sends to a target base station a switching request which contains a time slot used in communication with a mobile station. The base station allocates to the mobile station at least one idle communication channel included in time slots different from the time slot contained in the switching request received from the base station.

Abstract: A communication system includes: an RF/IF/BB unit (21) for receiving, in a mobile station device (20), a transmission signal from a base station device; a received power calculation unit (221) for obtaining received power thereof; a communication rate modification unit (23) for changing a communication rate by changing a modulation scheme used by the base station device to modulate the transmission signal in a predetermined case; and a communication rate increase limit unit (27) for limiting the communication rate to be increased by the communication rate modification unit (23), according to received power required for the mobile station device (20) to demodulate the transmission signal and according to the received power obtained when receiving the transmission signal after the communication rate is changed by the communication rate modification unit (23) and predicted based on the received power obtained by the received power calculation unit (221) and based on a decrease amount of a transmission power of a

Abstract: A radio base station (eNB 1) receives an SRS from the radio terminal (UE 2A) and SRSes from radio terminals (UE 2B through UE 2D), and calculates, on the basis of at least one of the SRSes from the radio terminal (UE 2A) and from the radio terminals (UE 2B through UE 2D), a reception weight that is to be used for wireless communication with the radio terminal (UE 2A).

Abstract: A radio base station (eNB1), when having received an upstream radio signal of a radio frequency band from a radio terminal (UE2), calculates, based on a demodulation reference signal included in the upstream radio signal, and stores reception weights of antennas (108A to 108D). The radio base station (eNB1) further sets, as the transmission weight of each of the antennas (108A to 108D), that one of the stored reception weights of the antennas (108A to 108D) which was calculated during a past given interval and which corresponds to a frequency band that is the nearest to the frequency band of a PDSCH that is a target for setting.

Abstract: A base station of a wireless communication system includes: a base station side data generation portion generating a number of sets of scramble data which are different from each other while the number of sets of the scramble data is the same as or more than the number obtained by multiplying the number of the sub-channels used in said overall wireless communication system by the number of the subcarriers; a base station side storage portion which stores the scramble data; a base station side upper layer control portion which outputs both transmission data for a terminal at other end of a communication and information of sub-channels; a base station side lower layer control portion which, based on the information of the sub-channels, controls the base station side storage portion to output scramble data corresponding to the sub-channels; a base station side scramble portion which conducts a multiplication operation between the transmission data output from the base station side upper layer control portion and

Abstract: Even if background noise is present, it is possible to control a guard interval length so that a minimum required SINR can be obtained. An OFDM communication device (10) includes: a correlation calculation unit (14) for calculating a correlation between a series of symbols to be received and a held signal that has a waveform identical to a waveform of a known signal contained in the series of symbols; a desired signal power acquisition unit (19) for acquiring a desired signal power based on a calculation result; a background noise power acquisition unit (22) for acquiring a background noise power that indicates a difference amount between a reception power of each of the series of symbols and the desired signal power; and a GI length determination/instruction unit (23) for determining the guard interval length in accordance with the background noise power and instructing a transmitter to transmit the series of symbols with the determined guard interval length.