Title :
Effects of Distributed Antenas of LAS-CDMA
Author :
Yuyan, Zhang ; Daoben, Li ; Zhi, Ni
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
Distributed antennas with large area synchronous wideband code division multiple access (LAS-CDMA) model under multi-path fading channel is analyzed. The spreading codes of the CDMA system are loosely synchronized(LS) spreading codes. LS codes exhibits a so-called interference free window ,where both the autocorrelation and cross correlation of the codes become zero. Therefore, if the signal is limited in the window, LS codes have the promise of mitigating the effect of inter symbol interference (ISI) and multiple access inference (MAI) in multi-path fading channels. The performance of LAS-CDMA with distributed antennas factors was studied, it has been verified that BER of mobile is related with the location of bases, the numbers of antennas and the signal´s power. Numerical results indicate that macro diversity gain is obtained by the use of distributed antennas, the performance of the system is affected by many factors
Keywords :
antennas; code division multiple access; fading channels; intersymbol interference; multipath channels; LAS-CDMA; distributed antena; distributed antennas; intersymbol interference; large area synchronous wideband code division multiple access; loosely synchronized spreading code; macro diversity; multipath fading channel; multiple access inference; Autocorrelation; Broadband antennas; Downlink; Fading; Instruments; Intersymbol interference; Mobile antennas; Multiaccess communication; Multiple access interference; Wireless networks; BER; LS codes; SNR; distributed antennas; macro diversity;
Conference_Titel :
Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-1136-8
Electronic_ISBN :
978-1-4244-1136-8
DOI :
10.1109/ICEMI.2007.4350632
