Details

Autor(en) / Beteiligte

• Young-Yong Lee
• Sung-Hyun Chung
• Min-Joong Rim
• Jae-Min Ahn
• Hyung-Jin Choi

Titel

SIR-based power control using unused OVSF code for W-CDMA reverse link receiver

Ist Teil von

• IEEE Seventh International Symposium on Spread Spectrum Techniques and Applications, 2002, Vol.3, p.777-781 vol.3

Ort / Verlag

IEEE

Erscheinungsjahr

2002

Quelle

IEEE Xplore

Beschreibungen/Notizen

• We evaluate the performance of a W-CDMA reverse link receiver system with closed loop fast transmit power control (TPC). For fast power control, signal-to-interference power ratio (SIR) must be measured precisely. We propose a new SIR measurement algorithm having a simple structure. The proposed algorithm uses unused orthogonal variable spreading factor (OVSF) code for interference power evaluation. The proposed SIR measurement algorithm is compared to the conventional SIR measurement algorithm (see Higuchi, K. et al., IEEE. J. Sel. Areas Commun., vol.18, no,8, p.1526-35, 2000; Seo, S. et al., IEICE Trans. Commun., vol.E81-B, no.7, p.1508-16, 1998; Andoh, H. et al., IEICE Trans. Commun., vol.E81-B, no.7, p.1517-26, 1998) under closed loop fast TPC. We adopted a weighted multi-slot averaging (WMSA) channel estimation filter with K=2 for mobile radio channel estimation and considered one slot TPC delay. Extensive computer simulation results show that the proposed algorithm using unused OVSF code reduces the required E/sub b//I/sub 0/ at the BER of 10/sup -3/ up to 0.9 dB and has an improved TPC error performance compared to the conventional algorithm.