| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an adaptive directivity variable device having superior interference characteristics from a high-power high-speed transmission user to a low-speed transmission user, through array antenna directivity control to the outgoing channel of a CDMA system. SOLUTION: After an inverse spread part 104 subjects it to inverse spread incoming channel spread spectrum signals from a mobile station, a radio wave arrival direction estimating means 106 estimates the direction of the mobile station, and an individual transmission power decision means 109 decides transmission power from a data transmission speed, decided by a data transmission speed decision means 108 for the mobile station. From the data transmission speed ratio of high-speed transmission and low-speed transmission or the ratio of spread spectrum ratios, a side-lobe level setting means 110 decides a side-lobe level suppression value to a main lobe, a null-setting means 111 suppresses interference near the main lobe, and a transmission directivity pattern formation means 107 decides a transmission pattern.</p> |
