Patent ID: 6829255
Filing Date: 2004-12-07
Classification: H04B

Abstract:
A CDMA base station transmission for spreading transmit data by spread code to each user for each symbol as unit data of each user, multiplex-synthesizing the spread data by the number of users, D/A-converting the multiplexed data, modulating the D/A-converted data into radio frequency band, then transmitting the modulated data through an antenna, comprising:a first spread multiplex synthesis unit that spreads and multiplexes transmit data of a predetermined number of users to be selected from a plurality of users; and a second spread multiplex synthesis unit that is additionally provided when the number of users increase and that spreads and multiplexes transmit data of a predetermined number of users to be selected from a plurality of users; wherein said first spread multiplex synthesis unit is provided with a first multiplex synthesis part inside the unit, and said first multiplex synthesis part adds the spread-multiplexed data of said first spread multiplex synthesis unit and the spread-multiplexed data of said second spread multiplex synthesis unit, D/A-converts the added spread-multiplexed data, modulates it into radio frequency band, transmits it through the antenna.