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New SAW-convolver demodulation technique using Costas-loop synchronization for high-speed spread-spectrum signal

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3 Author(s)
M. Hikita ; Central Res. Lab., Hitachi Ltd., Tokyo, Japan ; C. Takubo ; K. Asai

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

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:49 ,  Issue: 4 )