Design of common structures for CDMA systems

This work proposes flexible hardware structures of spreading and modulation for multi-mode CDMA systems. The proposed flexible structures supporting IS-95, CDMA2000 and WCDMA, include a pseudo noise code generator, a channelization code generator and a control circuit for signal flow control. The proposed design has been modeled by VHDL and synthesized using the Faraday 0.25 /spl mu/m standard cell library. The synthesis results show the area reduction about 24.7% compared with the original code generators.