Sanyo Electric Co., Ltd.

Kyocera Corporation

Tadayoshi Itou

Yoshiharu Doi

Takeo Miyata

Toshinori Iinuma

Masashi Iwami

A wireless base station comprises a response vector calculation unit (), an RSSI measuring unit (), an MSE calculation unit (), an FD calculation unit () and the like, and those units obtain an index showing communication quality of at least one of two mobile stations that are intended to be space-division multiplexed. According to the index, a control unit () judges the suitability of the two mobile stations for space-division multiplexing and performs space-division multiple access communication when judging suitable. The effect achieved with this construction is that the wireless base station maintains quality of communication between the wireless base station and mobile stations at a certain satisfactory level when performing space-division multiple access communication.

Radio base station and program for radio base station

In an adaptive array (), fading rate of a user is measured by a fading rate measuring circuit (), and the transmit weight vector is weighted in accordance with the fading rate by a transmitting circuit (). Thus, transmission power is increased for a user of which fading rate is large, and thus transmission directivity control for such a user becomes possible.

Radio device with transmission directivity, and control method and control program for the radio device

A frequency estimation unit () and a timing estimation unit () respectively detect a frequency offset and a timing offset from a signal received from a mobile station via a control channel. A weight calculation unit () corrects reception signals received via a communication channel, using the detected frequency offset and timing offset when new wireless connection to the mobile station is performed by forming an antenna directivity. A signal intended for the mobile station is separated from the corrected reception signals with high accuracy.

Growing community of inventors

Kaizu-gun, Japan

Tadayoshi Itou