Title :
SNR loss due to feedback quantization and errors in closed loop transmit diversity systems
Author_Institution :
Siemens AG, Munich, Germany
Abstract :
The paper presents the performance degradation in terms of average signal-to-noise ratio (SNR) loss due to quantization of the optimum weights and due to errors in the feedback channel for a two transmit and one receive antenna diversity system. Closed-form expressions are derived and are used to determine the theoretical performance loss of the two closed loop transmit diversity modes as described in the 3GPP UMTS specification (see Technical Specification Group Radio Access Network, "Physical layer procedures (FDD)", 3GPP TS 25.214).
Keywords :
3G mobile communication; closed loop systems; code division multiple access; diversity reception; feedback; mobile radio; quantisation (signal); receiving antennas; telecommunication channels; transmitting antennas; 3GPP UMTS specification; SNR; W-CDMA; WCDMA; antenna diversity system; closed loop systems; feedback channel errors; feedback quantization; signal-to-noise ratio; transmit diversity systems; 3G mobile communication; Closed-form solution; Degradation; Feedback loop; Performance loss; Propagation losses; Quantization; Radio access networks; Receiving antennas; Signal to noise ratio;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on
Print_ISBN :
0-7803-7589-0
DOI :
10.1109/PIMRC.2002.1046518
