Abstract: Each of a general chunk to which pilot signals are allocated at a general density, and a high-density chunk to which pilot signals are allocated at a higher density than the density of the general chunk, is transmitted in a frequency band common to OFDM transmitters. Each of the OFDM transmitters allocates the high-density chunk to any one of OFDM receivers, which notifies poor receiving quality.

Abstract: A mobile communication terminal apparatus includes an antenna unit configured to select antenna radiation characteristics, and receives a first signal transmitted from transmitting station according to the selected antenna radiation characteristic, a transmitter which transmits a detection signal to other terminals, the designation signal generated from the first signal, for designating the antenna radiation characteristics, a first receiver which receives another designation signal from the other terminal apparatuses, a controller which controls the antenna unit to obtain the antenna radiation characteristics designated by the another designation signal, a second receiver which receives second signal that is transferred from the other terminal apparatuses and is obtained by the antenna radiation characteristics selected by the other terminal apparatuses, and a processor which processes the second signal and the detection signal in a diversity scheme.

Abstract: The present invention relates to a system conducting multi-carrier communications between a base station and a plurality of mobile terminals. When a transmission format of an individual information channel transmitted from the base station to the mobile terminals is output over a control channel from the base station to the mobile terminals, the transmission is conducted over the control channel of the same chunk as the chunk used in the individual information channel.

Abstract: A communication device includes a communication unit capable of performing radio communications in a broad band including a first band whose frequency is relatively higher and a second band whose frequency is relatively lower. The communication device further includes, for example, a determination unit which determines whether or not a channel in the first band is usable, and a control unit which preferentially assigns data to be transmitted or received to the channel in the first band when the channel in the first band is usable.

Abstract: A mobile communication terminal apparatus includes an antenna unit configured to select antenna radiation characteristics, and receives a first signal transmitted from transmitting station according to the selected antenna radiation characteristic, a transmitter which transmits a detection signal to other terminals, the designation signal generated from the first signal, for designating the antenna radiation characteristics, a first receiver which receives another designation signal from the other terminal apparatuses, a controller which controls the antenna unit to obtain the antenna radiation characteristics designated by the another designation signal, a second receiver which receives second signal that is transferred from the other terminal apparatuses and is obtained by the antenna radiation characteristics selected by the other terminal apparatuses, and a processor which processes the second signal and the detection signal in a diversity scheme.

Abstract: A wireless control apparatus which performs a wireless communication with a plurality of wireless terminals, comprising: an evaluation signal receiver configured to receive evaluation signals relating to received signals in the respective wireless terminals, which are transmitted from the plurality of wireless terminals; a supplement signal deciding unit which decides a supplement signal necessary to supplement the received signals in the plurality of wireless terminals; and a supplement signal transmitter configured to transmit the supplement signal decided by the supplement signal deciding unit, to the plurality of wireless terminals.

Abstract: In the transmission device, a synchronization pattern made by arranging a predetermined basic pattern consisting of a combination of a predetermined number of symbols and a reversal basic pattern made by reversing a polarity of each symbol of the basic pattern, in the order according to a reversal pattern, is generated, and transmission data obtained by adding thus obtained synchronization pattern at predetermined timing is transmitted. In the reception device, the basic pattern and reversal basic pattern in the synchronization pattern are correlated with each other by a matched filter (11) corresponding to the basic pattern, and the correlation of the reversal pattern which appears in a signal obtained as a result, is taken by a matched filter consisting of delay portions (12), multipliers (13) and an adder (14).

Abstract: A multiplier multiplies a baseband signal with a scramble code generated by a CPICH scramble code generator and an integrator integrates the result of the multiplication. A symbol selection control unit controls the integrator such that the integrator integrates each of two successive slots in which combinations of the symbols transmitted from two antennas of a base station are the same, in accordance with the information about the synchronous positions of the slots and frames. The result of the integration is delayed by a 1-symbol delay unit and then a code of a complex component is inverted by a complex conjugate unit. A multiplier multiplies the outputs of the integrator and complex conjugate unit, which are shaped in a complex number, to obtain an amount of phase rotation between the successive symbols, i.e. a frequency error.

Abstract: A multiplier multiplies a baseband signal with a scramble code generated by a CPICH scramble code generator and an integrator integrates the result of the multiplication. A symbol selection control unit controls the integrator such that the integrator integrates each of two successive slots in which combinations of the symbols transmitted from two antennas of a base station are the same, in accordance with the information about the synchronous positions of the slots and frames. The result of the integration is delayed by a 1-symbol delay unit and then a code of a complex component is inverted by a complex conjugate unit. A multiplier multiplies the outputs of the integrator and complex conjugate unit, which are shaped in a complex number, to obtain an amount of phase rotation between the successive symbols, i.e. a frequency error.

Abstract: A control cycle discriminating section sets a control cycle T of transmission power to be a short cycle Tl when the fluctuation rate S is lower than a reference value S1 or equal to or higher than a reference value S2, and sets the control cycle T to be a long cycle Ts when the fluctuation rate S is equal to or higher than the reference value S1 and lower than the reference value S2. A power controlling section controls transmission power of a transmitting section with the control cycle T. In a mobile station, a power detecting section averages reception power of a radio frequency (RF) signal transmitted from the base station, with the control cycle T, and measures the averaged reception power. A TPC bit generating section compares the measured power with a reference value, generates the TPC signal and transmits the TPC signal to the base station.

Abstract: A RAKE receiver includes an arithmetic circuit for weighting coefficients. The arithmetic circuit obtains the signal power for each path from the reception amplitude on the path which is detected by a transmission path characteristics detector, and also obtains the interference powers from the reception amplitudes on two other paths which are respectively detected by transmission path characteristics detectors. The arithmetic circuit then calculates the weighting coefficients on the basis of the these signal powers and interference powers. The weighting coefficients are respectively supplied to weighting multipliers, thereby weighting the reception signals from the respective paths. A symbol synthesizer performs symbol synthesis of the resultant signals.

Abstract: A feed water heating system for heating a feed water for a power-generating plant having a steam turbine, a condenser and a steam generator, comprises: a steam injector unit for receiving a plurality of bled steams having different pressures extracted from the steam turbine and an effluent water discharged from the condenser to mix the effluent water with the plurality of bled steams to raise the temperature and pressure of a mixture of the effluent water with the plurality of bled steams to deaerate and discharge the temperature and pressure raised mixture.

Abstract: With a CDMA mobile communication system of the present invention, the phase difference sensing circuit of the base station senses the phase difference with respect to a reference phase from the cross-correlation value of the up-link channel signals coming from mobile stations and sends timing control information for compensating the phase difference closer to zero to the mobile stations. Then, in each of the mobile stations, the transmission timing control circuit variably sets the amount of delay in the delay circuit of the modulation circuit according to the timing control information sent from the base station. This enables the transmission timing of the transmission signal of each of the mobile stations to undergo delay control, maintaining the orthogonality between the individual up-link channel signals at the base station.

Abstract: When a channel for micro cell is assigned to a mobile station PS1 of a micro cell, one carrier frequency whose reception level is lower than a threshold level is selected from a plurality of up carrier frequencies and down carrier frequencies which a macro cell system holds, an up channel and a down channel for micro cell are set on the selected carrier frequency, the above channels are assigned to the mobile station PS1 of the micro cell to permit radio communication based on the TDD scheme between the mobile station PS1 and a micro cell base station BSb1.