Coherent surface acoustic wave unique word detector

Details Coherent surface acoustic wave unique word detector Coherent surface acoustic wave unique word detector

1989-08-29

1991-10-08

Smith, Jerry

Boots, shoes, and leggings

333193, 310313R, G06G 712

Patent

active

050560557

ABSTRACT:
A unique word in a digital communication system is detected on a receiving side by using an acoustic surface wave matched filter (4) having a piezoelectric substrate, an input interdigital electrode (4c) and and output interdigital electrode (4a, 4b) on the substrate. An input signal is applied to the input interdigital electrode in the form of a phase modulated IF band signal. A pattern of the output interdigital electrode is designed depending upon a unique word to be detected where data 1 corresponds to an upper finger (4a) followed by a lower finger (4b), data 0 corresponds to a lower finger (4b) followed by an upper finger (4a) or vice versa, and progagation time of the surface acoustic wave over the spacing (d) between each pairs of fingers (4a, 4b) is equal to a bit time duration of the unique word. An output of the acoustic surface wave matched filter is coherently detected, and when absolute value of the coherent detection exceeds a predetermined value, a unique word is recognized and the received phase in the demodulator is determined at the same time.

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"Unique Word Detection in Digital Burst Communications", IEEE Transactions on Communication Technology, vol. COM-16, No. 4, Aug. 1968, pp. 597-605.
"Phase Ambiguity Resolution in a Four-Phase PSK Communications System", IEEE Transactions on Communication Technology, vol. COM-19, No. 6, Dec. 1971, pp. 1200-1210.

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