Blind Identification of the Uplink Scrambling Code Index of a WCDMA Transmission and Application to Femtocell Networks

Mathieu Des Noes (1) , Valentin Savin (1) , Jean-Marc Brossier (2) , Laurent Ros (2)

1 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
2 GIPSA-CICS - GIPSA - Communication Information and Complex Systems

Interference between macro and femtocells is an important issue for the development of WCDMA femtocell networks. More specifically, the uplink signal of a macro User Equipment may generate an unacceptable level of interference at the femto Base Station. To avoid this situation, interference mitigation techniques could be implemented. All the proposed techniques require the knowledge of the uplink scrambling code index of the interferer. Unfortunately, if the femto BS is in a closed access mode, there are no signalling links with the surrounding macro BSs. The femto BS has to estimate blindly this scrambling code index. An algorithm which performs a blind identification of the uplink scrambling code index of a WCDMA transmission is proposed in this article. This gives the possibility to implement interference cancelation algorithm at the femto BS.

Mots clés: WCDMA; blind identification; Uplink scrambling code; code acquisition; femtocells

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Mathieu Des Noes, Valentin Savin, Jean-Marc Brossier, Laurent Ros. Blind Identification of the Uplink Scrambling Code Index of a WCDMA Transmission and Application to Femtocell Networks. ICC 2013 - IEEE International Conference on Communications, Jun 2013, Budapest, Hungary. 6 p. ⟨hal-00796350⟩