Title :
Two-dimensional RAKE reception scheme for DS/CDMA systems in DBF antenna configuration
Author :
Inoue, Takashi ; Karasawa, Yoshio
Author_Institution :
ATR Adaptive Commun. Res. Lab., Kyoto, Japan
Abstract :
In land mobile radio communications systems, degradation of the instantaneous signal to noise (and interference) power ratio is significant in multipath fading environments. In this paper, a two-dimensional RAKE reception scheme in a digital beam forming (DBF) antenna configuration to be applied to the base station of the DS/CDMA system is proposed. A quantitative evaluation of fading reduction is performed by computer simulation. The proposed system works well even under the condition that the delay spread of the propagation path is small compared with the chip time of the spread spectrum signals, and in environments where the directions of arrival (DOAs) of the multipath waves are concentrated in the direction of a mobile terminal
Keywords :
array signal processing; code division multiple access; delays; digital radio; fading; interference suppression; land mobile radio; multibeam antennas; multipath channels; pseudonoise codes; radio receivers; radiofrequency interference; spread spectrum communication; DBF antenna configuration; DS/CDMA systems; base station; chip time; delay spread; digital beam forming antenna configuration; directions of arrival; fading reduction; instantaneous signal to noise; interference; land mobile radio; mobile terminal; multipath fading environments; propagation path; spread spectrum signals; two-dimensional RAKE reception scheme; Antennas and propagation; Base stations; Degradation; Fading; Interference; Land mobile radio; Multiaccess communication; Performance evaluation; Signal to noise ratio; Working environment noise;
Conference_Titel :
Vehicular Technology Conference, 1997, IEEE 47th
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-3659-3
DOI :
10.1109/VETEC.1997.606021
