Title :
A novel cost function of adaptive antenna for CDMA system
Author :
Zha, Mingyong ; Wang, Huazhi ; Sun, Xu
Author_Institution :
Radio Res. Center, Beijing Univ. of Posts & Telecommun., China
Abstract :
Conventional adaptive antennas optimize the base band spreading signal; the cost function is the mean square error of the difference between the weighted spreading signals and a reference. The cost function does not utilize the merits of CDMA that spread spectrum technology can improve the signal SNR. The article presents a new cost function which optimizes the despreading signals of the base band element outputs, and is the mean square error of the difference between the despreading signal and a new reference signal. Computer simulations has been further carried out, and the results illustrate that the novel cost function can improve the system capacity.
Keywords :
adaptive antenna arrays; array signal processing; channel capacity; code division multiple access; interference suppression; mean square error methods; multiuser channels; radiofrequency interference; spread spectrum communication; BER; CDMA system; SNR; adaptive antenna; adaptive beamforming; base band element outputs; base band spreading signal; computer simulations; cost function; despreading signals optimisation; interference nulling; interference suppression; mean square error; reference signal; spread spectrum technology; system capacity; weighted spreading signals; Adaptive algorithm; Adaptive arrays; Antenna measurements; Array signal processing; Computer simulation; Cost function; Filters; Multiaccess communication; Spread spectrum communication; Vectors;
Conference_Titel :
Antennas, Propagation and EM Theory, 2000. Proceedings. ISAPE 2000. 5th International Symposium on
Conference_Location :
Beijing, China
Print_ISBN :
0-7803-6377-9
DOI :
10.1109/ISAPE.2000.894754
