Title :
Adaptive array antenna combined with tapped delay line using processing gain for spread-spectrum CDMA systems
Author :
Kohno, Ryuji ; Wang, Hefeng ; Imai, H.
Author_Institution :
Div. of Electr. & Comput. Eng., Yokohama Nat. Univ., Japan
Abstract :
The paper first proposes a method to correctly update the weights of an adaptive array antenna using the inherent processing gain of a spread spectrum (SS) receiver, even for received signals with very low desired-to-undesired signal power ratio (DUR). Since the method reduces effect of the delay in the controlling loop, stable convergence can be guaranteed in a fading channel. Secondly the method is applied to a tapped delay line (TDL) adaptive array antenna in order to improve performance of rejecting co-channel interference in CDMA. The array is investigated corresponding to the DUR and bandwidth of SS signals
Keywords :
antenna phased arrays; code division multiple access; convergence; delay lines; interference suppression; radio receivers; radiofrequency interference; receiving antennas; spread spectrum communication; DUR; SS-CDMA; TDL; adaptive array antenna; bandwidth; cochannel interference; controlling loop; convergence; desired-to-undesired signal power ratio; fading channel; processing gain; spread spectrum receiver; spread-spectrum CDMA systems; tapped delay line; tapped delay line adaptive array antenna; Adaptive arrays; Antenna arrays; Convergence; Delay effects; Delay lines; Fading; Interchannel interference; Receiving antennas; Signal processing; Spread spectrum communication;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1992. Proceedings, PIMRC '92., Third IEEE International Symposium on
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0841-7
DOI :
10.1109/PIMRC.1992.279856
