Disclosed is a CDMA base station transmission device having: 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 increases. The first spread multiplex synthesis
unit is provided with a first multiplex synthesis part inside the unit,
and the first multiplex synthesis part adds the spread-multiplexed data of
the first spread multiplex synthesis unit and the spread-multiplexed data
of the second spread multiplex synthesis unit, D/A-converts the added
spread-multiplexed data, modulates it into radio frequency band, transmits
it through the antenna.
