Patent ID: 6798847
Filing Date: 2004-09-28
Classification: H04B,H04J

Abstract:
A base station transmission apparatus in a mobile communication system using transmit antenna diversity between a base station with a plurality of antennas and a mobile station, comprising:a modulator for generating a complex symbol in response to a coded symbol; a first spreader for generating a plurality of different complex symbols in response to the complex symbol from the modulator, and generating a plurality of first orthogonal spreading symbols by spreading the plurality of the generated complex symbols with a first orthogonal code assigned to the mobile station; a second spreader for generating a plurality of same complex symbols in response to the complex symbol from the modulator, spreading the plurality of same complex symbols with a second orthogonal code, which is assigned to the mobile station, being different from the first orthogonal code and generating a plurality of second orthogonal spreading symbols, by multiplying the orthogonal spreading symbols by weights for the antennas, determined based on feedback information, received from the mobile station, indicating reception status of a base station signal; a plurality of summers for summing up the first orthogonal spreading symbols from the first spreader and the second orthogonal spreading symbols from the second spreader; and a transmitter for, shifting the orthogonal spreading symbols to a radio frequency band, and transmitting the shifted symbols through the antennas.