Title :
Performance of MIMO Rake receivers in WCDMA systems
Author :
Jungnickel, Volker ; Chang, Yun-Shen ; Pohl, Volker
Author_Institution :
Fraunhofer-Inst. for Telecommun., Berlin, Germany
Abstract :
The rake receiver is investigated for spatial multiplexing (SM) in wide-band code-division multiple access systems. In general, the SM increases the data rate and the diversity order as well. The appropriate maximum likelihood detector is derived in this paper and it is shown that the diversity order is related to the product of the numbers of receive antennas and taps. With realistic numbers similar diversity orders may be achieved also with reduced complexity detection schemes. Finally, a standard-conformal scrambling technique is proposed to enhance the performance and to equalize it among the full set of orthogonal variable spreading factor (OVSF) sequences used in the third generation cellular system.
Keywords :
MIMO systems; antenna arrays; cellular radio; code division multiple access; diversity reception; maximum likelihood detection; multiplexing; radio receivers; receiving antennas; sequences; MIMO Rake receiver performance; data rate; diversity order; maximum likelihood detector; orthogonal variable spreading factor sequences; receive antennas; reduced complexity detection scheme; spatial multiplexing; standard-conformal scrambling technique; third generation cellular system; wide-band code-division multiple access system; Code division multiplexing; Detectors; Fading; MIMO; Maximum likelihood detection; Multiaccess communication; Multipath channels; Receiving antennas; Samarium; Wideband;
Conference_Titel :
Wireless Communications and Networking Conference, 2004. WCNC. 2004 IEEE
Print_ISBN :
0-7803-8344-3
DOI :
10.1109/WCNC.2004.1311405