Title :
Detection of downlink transmit diversity in third generation cellular networks
Author :
Renucci, Pascal G. ; Toussi, Karim N. ; Banerjee, Debarag N.
Author_Institution :
Lockheed Martin, Bethesda, MD, USA
Abstract :
The 3GPP WCDMA specification requires that the mobile support optional space time transmit diversity (STTD) encoding of various physical channels on the downlink. This means that the mobile needs to know if any physical channel is STTD encoded. In this paper, we propose an efficient and robust algorithm to detect STTD on the downlink by correlating the received signal at the mobile with the known patterns of the downlink synchronization channel (SCH) and the primary common pilot channel (P-CPlCH). The correlation result is used to estimate the relative phase between SCH and P-CPICH, which can only be set to two possible values at the base station transmitter, depending on whether STTD is used or not. We introduce near-optimum, but practical, decision metrics for this approach and provide a statistical analysis of the proposed method.
Keywords :
3G mobile communication; broadband networks; cellular radio; channel estimation; code division multiple access; correlation methods; diversity reception; fading channels; probability; radio links; radio transmitters; statistical analysis; synchronisation; 3GPP WCDMA specification; decision metrics; downlink synchronization channel; fading channels; primary common pilot channel; space time transmit diversity; space time transmit diversity encoding; statistical analysis; third generation cellular networks; transmit diversity; Base stations; Diversity methods; Diversity reception; Downlink; Fading; Intelligent networks; Land mobile radio cellular systems; Multiaccess communication; Robustness; Transmitting antennas;
Conference_Titel :
Wireless Communications and Networking Conference, 2004. WCNC. 2004 IEEE
Print_ISBN :
0-7803-8344-3
DOI :
10.1109/WCNC.2004.1311280
