Title :
SIR estimation on common pilot channel with the knowledge of data to pilot power ratio for closed loop power control in WCDMA FDD downlink
Author :
Quddus, A.U. ; Tafazolli, R.
Author_Institution :
Centre for Commun. Syst. Res., Surrey Univ., Guildford, UK
Abstract :
For the closed loop power control (CLPC) of WCDMA FDD downlink, the signal to interference ratio (SIR) is typically estimated by using the dedicated pilot symbols in the dedicated physical control channel (DPCCH). In this paper it is shown that by estimating the SIR on the common pilot channel (CPICH) along with the knowledge of DPCH to CPICH power ratio, the CLPC performs much better as compared to the case when the SIR is estimated on the DPCCH pilot symbols only. It is proposed that additional slot formats be introduced in the 3GPP forward link slot formats with a reduced number of DPCCH pilot symbols and a corresponding increase in the data symbols. These slot formats could be utilized when the CPICH is available and will also result in an increase in the data throughput.
Keywords :
3G mobile communication; closed loop systems; code division multiple access; data communication; frequency division multiplexing; packet radio networks; power control; telecommunication control; 3GPP forward link slot formats; CLPC; DPCH to CPICH power ratio; SIR estimation; WCDMA FDD downlink; closed loop power control; common pilot channel; data throughput; data to pilot power ratio; dedicated physical control channel; signal to interference ratio; 3G mobile communication; Channel estimation; Communication system control; Control systems; Downlink; Interference; Mobile communication; Multiaccess communication; Power control; Throughput;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400144