Title :
Multiuser code acquisition in multipath channels
Author :
Stojanovic, Milica ; Freitag, Lee
Author_Institution :
Massachusetts Inst. of Technol., Cambridge, MA, USA
Abstract :
An adaptive algorithm for code acquisition in a direct sequence CDMA system is proposed. The algorithm is based on simultaneous channel estimation for multiple users. Its operation is demonstrated with up to four users transmitting over a 2 km shallow water channel within a 24 kHz acoustic bandwidth. Experimental results demonstrate the possibility of successful acquisition in the presence of strong multipath, with acquisition times on the order of a few hundred chip intervals.
Keywords :
channel estimation; code division multiple access; multipath channels; multiuser channels; spread spectrum communication; underwater sound; 24 kHz; acoustic bandwidth; adaptive algorithm; direct sequence CDMA system; multipath channels; multiuser code acquisition; shallow water channel; simultaneous channel estimation; underwater acoustic mobile network; Adaptive algorithm; Bandwidth; Channel estimation; Filters; Multiaccess communication; Multipath channels; Multiple access interference; Pulse modulation; Pulse shaping methods; Underwater acoustics;
Conference_Titel :
Oceans 2005 - Europe
Conference_Location :
Brest, France
Print_ISBN :
0-7803-9103-9
DOI :
10.1109/OCEANSE.2005.1511687
