4. Key Technology of WCDMA

This chapter introduces the principles of every part in a WCDMA transceiver, including the principle and structure of RAKE receiver, radio frequency (RF) and intermediate frequency (IF) processing technology, channel codec technology and multi-user detection technology.

Channel codec is Convolutional code or Turbo code. Modem adopts the technology of CDMA direct spread spectrum communication. Channel coding varies with application data, that is, AMR adaptive multi-rate code for voice, and ITU Rec. H.324 series protocols for image and multimedia services.