Abstract: A Walsh code assigning apparatus includes a retaining unit retaining assignment order information about an order of assignment of the plural Walsh codes such that one Walsh code having a smaller bit length becomes unable to he orthogonally separated as being precedent over another Walsh code having a larger bit length and a controller including a retrieving unit retrieving an idle Walsh code having an assignment request bit length in accordance with the assignment order information retained in the retaining unit, and assigning unit assigning the idle Walsh code, which has been obtained by the retrieving unit, to the spreading code of a last-named communication channel for which the assignment request is issued.

Abstract: A transmission power amplifier unit of a base-station apparatus for compensating for non-linear distortion of a transmission power amplifier by feed-forward control is provided with a gain varying unit for varying gain of the transmission power amplifier unit. At start-up of the transmission power amplifier unit, a controller determines whether the base-station apparatus is in a blossoming mode or breathing mode, maximizes gain of the transmission power amplifier unit by controlling the gain varying unit if the mode is the blossoming mode and increases the gain gradually in proportion to the passage of time if the mode is the breathing mode.

Abstract: A transmission power amplifier unit of a base-station apparatus for compensating for non-linear distortion of a transmission power amplifier by feed-forward control is provided with a gain varying unit for varying gain of the transmission power amplifier unit. At start-up of the transmission power amplifier unit, a controller determines whether the base-station apparatus is in a blossoming mode or breathing mode, maximizes gain of the transmission power amplifier unit by controlling the gain varying unit if the mode is the blossoming mode and increases the gain gradually in proportion to the passage of time if the mode is the breathing mode.

Abstract: The present invention relates to a linear amplifier for amplifying power of a radio-frequency signal whose level varies widely, based on feed-forward technique. The linear amplifier according to the present invention is given in advance appropriate transfer characteristics for an error elimination loop and an error detection loop and these appropriate transfer characteristics are applied at a starting time. Therefore, performance and total reliability of equipment to which the present invention is applied are enhanced and cost reduction thereof is realized.

Abstract: The present invention relates to a linear amplifier for amplifying power of a radio-frequency signal whose level varies widely, based on feed-forward technique. The linear amplifier according to the present invention is given in advance appropriate transfer characteristics for an error elimination loop and an error detection loop and these appropriate transfer characteristics are applied at a starting time. Therefore, performance and total reliability of equipment to which the present invention is applied are enhanced and cost reduction thereof is realized.

Abstract: A Walsh code assigning apparatus includes retaining means for retaining assignment order information about an order of assignment of the plural Walsh codes such that one Walsh code having a smaller bit length becomes unable to be orthogonally separated as being precedent over another Walsh code having a larger bit length and controlling means including retrieving means for retrieving an idle Walsh code having an assignment request bit length in accordance with the assignment order information retained in the retaining means, and assigning means for assigning the idle Walsh code, which has been obtained by the retrieving means, to the spreading code of the last-named communication channel for which the assignment request is issued. With this apparatus, efficient assignment of a Walsh code of any bit length can be realized by controlling an order of assignment of Walsh code in a communication system handles Walsh codes of different bit lengths.

Abstract: A transmission power amplifier unit of a base-station apparatus for compensating for non-linear distortion of a transmission power amplifier by feed-forward control is provided with a gain varying unit for varying gain of the transmission power amplifier unit. At start-up of the transmission power amplifier unit, a controller determines whether the base-station apparatus is in a blossoming mode or breathing mode, maximizes gain of the transmission power amplifier unit by controlling the gain varying unit if the mode is the blossoming mode and increases the gain gradually in proportion to the passage of time if the mode is the breathing mode.