A PRACTICAL MEANS FOR DIGITAL GENERATION AND COMBINATION OF A MULTIPLICITY OF CDMA/FDMA SIGNALS

摘要

A modulator system for generating a plurality of individual modulated RF signals (Subband 1-Subband 7) and combining (13) them and transmitting them in different frequency channels. The invention provides a practical method and apparatus for generating and combining a multiplicity of CDMA signals in several radio channels using digital circuit. Further, several such band segments can be generated in parallel and combined to cover a large bandwidt h. The invention generates this multiplicity of signals and combines them at baseband using all digital techniques. The advantage of this approach is gre at simplification in hardware and improvement in reliability, as well as flexibility.