Title :
New SAW-convolver demodulation techniques using Costas-Loop synchronization for high-bit-rate CDMA signals
Author :
Takubo, C. ; Hikita, Masayuki ; Asai, Kikuo
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
A new synchronous-demodulation method for high-speed CDMA signal, that combines a SAW convolver with a Costas-Loop circuit has been proposed. In the receiver, synchronization of the received CDMA signal and the LO signal can be carried out independent of the transmitter. A QPSK-CDMA signal of 9 Mbps with 60 Mcps has been clearly demodulated using this method.
Keywords :
code division multiple access; demodulation; quadrature phase shift keying; surface acoustic wave convolution; synchronisation; 60 Mbit/s; 9 Mbit/s; Costas-Loop circuit; LO signal; QPSK-CDMA signal; SAW convolver; synchronization; synchronous demodulation; Circuits; Convolvers; Delay lines; Demodulation; Frequency synchronization; Multiaccess communication; RF signals; Radio transmitters; Signal generators; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849421
