Asahi Glass Company, Limited

Hitachi, Ltd.

Other

Kddi Corporation

Joichi Saito

Yuuji Ishida

Toshinori Suzuki

Naoki Tsubaki

Yoshio Takeuchi

Naruhito Nakahara

Nobuaki Kunii

Sumaru Niida

Toshiro Suzuki

Hirotsugu Yamamoto

May Suzuki

Hiroshi Wada

Kiyoshi Kawamoto

Yuji Ishida

Hiromitsu Takeyasu

Josho Kashiwame

Takashi Watabe

Hideki Shimizu

Kiyoshi Tanabe

Shigehito Shibata

Sigeyuki Kozawa

A wireless communication device for a communication system including data channels and control channels is disclosed. This device includes a receive section for receiving signals including data signals sent over the data channels, and control signals sent over control channels, the control signal corresponding to the data signals, a control channel demodulator for demodulating the control signals indicating at least one of the packet size and modulation method, a memory for accumulating the receive signals during the demodulation of the control signals, and a data channel demodulator for loading the receive signal from the memory, and demodulating the data signal according to the indicated at least one of the packet size and modulation method determined based on the demodulated control signals.

Baseband demodulation architecture for adaptive modulation method

In a mobile communication system employing code division multiple accesses and having radio logical channels such as control channels and traffic channels, for the purpose of interference cancellation processing which is implemented without a large processing delay even under a call control application, the baseband receiving part of the mobile communication system includes a common control channel demodulatorwhich executes the demodulation processing of a common control channel as to a received baseband reception signal, an interference cancellerwhich executes interference cancellation processing for a received multiplexed signal on the basis of the notification information of the control channels, and a synthesis/error correction processorwhich executes error correction processing, etc. as to user information having undergone the interference cancellation processing and thereafter executes frame formation processing. The common control channel is demodulated by the common control channel demodulatorand is not submitted to interference cancellation processing, thereby to heighten the processing speed of system information. In the interference canceller, cross-correlation interferences are cancelled as to the dedicated control channel and the traffic channel other than the common control channel, thereby to enhance a channel efficiency.

Base station and mobile communication system

A low-cost communication system utilizing a code division multiple access, which controls scale-up of an apparatus due to the provision of an interference suppressing function in a base transceiver station, prevents the reduction of channel utilization efficiency, and enables a high-quality communication. Conventionally, a signal obtained through an interference cancellation stage process has been processed at subsequent cascade-connected stages. The interference cancellation stage process has been carried out by cascade-connecting several circuits performing the same process in a multi-stage interference-canceling device. However, in the present invention, by performing a demodulation process for generating replica signals, feeding back the replica signals to a correlation circuit for another demodulation process, and repeating the same signal process, the interference cancellation stage process is carried out. Such a configuration enables reduction of hardware.

Communication system

A base station apparatus, a mobile radio system, and a transmission power control method that can perform transmission power control having the high interference suppressing effect with a smaller processing delay are provided. The base station apparatus comprises: a measurement part for measuring SIRs of a received signal subjected to interference suppression by an interference suppressing receiving circuit in a former stage in an interference suppressing receiving part of the radio base station apparatus, and of a received signal subjected to interference suppression by an interference suppressing receiving circuit in a later stage; a calculation part for calculating a correction SIR based on the obtained SIRs, and for estimating a transmission power control SIR from a current first stage SIR and a past correction SIR; and a signal generator for generating a transmission power control signal by comparing the transmission power control SIR and a target SIR. Control of transmission power of a mobile station is performed by transmitting this transmission power control signal to the mobile station.

Base station apparatus, mobile communication system, and method of controlling transmission power

In order to prevent decrease of channel efficiency and to effectuate high quality communication while moderating increase of apparatus scale of an interference canceler part and cutting down costs, in a mobile communication and radio base station apparatus according to the present invention, an interference cancel processing part within the base station apparatus is provided with reverse spread processing/respread processing parts for performing reverse spread processing and respread processing on received signals, synthesizing processing parts for synthesizing signals that have been subjected to the respread processing, and subtraction processing parts for subtracting the synthesized signal from received signal, in multiple stages. The interference cancel processing part processes received signals of users &num;1-&num;k. As a demodulation processing part, there is provided n demodulation processing parts that perform demodulation processing for received signals of users &num;1-&num;n, the number of those users being larger than the number of the users that can be processed in the interference cancel processing part. Those demodulation processing parts perform demodulation processing with respect to signals that have been subjected to the interference cancel processing.

Mobile communications system and radio base station apparatus

Polyurethane/polyurethane-urea resin and process for producing the same

Process for producing a rigid foam

The present invention relates a method for producing a polyether ester polyol containing polycarboxylic acid residues in the vicinity of the terminals, by means of a doubles metal cyanide complex catalyst. Namely, the present invention is a method for producing a polyether ester polyol by reacting a polyether polyol having a hydroxyl value of at most 400, a polycarboxylic anhydride and a monoepoxide by means of a double metal cyanide complex as a catalyst. The present invention relates also to a process for producing a flexible polyurethane foam or a polyurethane elastomer using this polyether ester polyol. The flexible polyurethane foam produced has a high thermal fusing properties, and by laminating it with e.g. cloth, it is possible to obtain a laminate having high bond strength. Further, this polyurethane elastomer has superior physical properties as compared with an elastomer obtainable by using a polyether polyol or a polyester polyol.

Methods for producing polyether ester polyols and polyurethanes

A process for producing a shaped article of a non-cellular or microcellular polyurethane elastomer by reaction injection molding by using a high molecular weight active hydrogen compound component (A), a chain extender component (B) and a polyisocyanate compound component (C) as starting materials, wherein

Process for producing polyurethane elastomer and composition as starting

Growing community of inventors

Yokohama, Japan

Joichi Saito