Title :
New SAW-convolver demodulation technique using Costas-loop synchronization for high-speed spread-spectrum signal
Author :
Hikita, Mitsutaka ; Takubo, Chisaki ; Asai, Kengo
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
fDate :
4/1/2001 12:00:00 AM
Abstract :
A new synchronous-demodulation method for a high-speed spread-spectrum (SS) signal, which combines a surface acoustic wave convolver with a Costas-loop circuit has been proposed. From the convolver, in-phase and quadrature-phase components of the correlated signal can be directly derived. A control voltage obtained by a Costas-loop circuit adjusts the frequency and phase of a local-oscillation (LO) signal to those of the SS signal. Thus, in the receiver, synchronization of the LO signal and the received signal can be carried out independently of the transmitter. A quadrature phase-shift keying SS signal with 9 Mb/s and 60 Mc/s has been successfully demodulated using this method
Keywords :
demodulation; quadrature phase shift keying; spread spectrum communication; surface acoustic wave convolution; synchronisation; wireless LAN; 9 Mbit/s; Costas-loop synchronization; SAW-convolver demodulation technique; control voltage; high-speed spread-spectrum signal; in-phase components; local-oscillation signal; quadrature phase-shift keying; quadrature-phase components; synchronous-demodulation method; Acoustic waves; Circuits; Convolvers; Demodulation; Frequency synchronization; Phase shift keying; Spread spectrum communication; Surface acoustic waves; Transmitters; Voltage control;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
