Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-03-07
1997-09-16
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, H03H 972
Patent
active
056684312
ABSTRACT:
A surface wave device, for use in differential coherent detection in a commutation signaling communications system using N predetermined M-bit codewords, propagates surface waves for each codeword to a first coded output IDT (inter-digital transducer) comprising M parallel taps with a pitch t=T/M, the taps having phases representing bits of the respective codeword, and to a second output IDT which is at a distance from an input IDT greater by T than the first coded output IDT, to provide an additional delay of one information symbol. The input IDT, or each tap of each coded output IDT, has a length equal to t. The second output IDT can comprise a coded IDT, or a delay tap responsive to the surface wave propagated via the first coded output IDT.
REFERENCES:
patent: 3810257 (1974-05-01), Jines et al.
patent: 3855548 (1974-12-01), Namdi et al.
patent: 3961290 (1976-06-01), Moore
patent: 4096477 (1978-06-01), Epstein et al.
patent: 4169286 (1979-09-01), Uzunoglu et al.
patent: 4620191 (1986-10-01), Skeir
patent: 5051709 (1991-09-01), Birkett et al.
patent: 5056055 (1991-10-01), Shinonaga
patent: 5365138 (1994-11-01), Saw et al.
"Communication Signaling--An Antimultipath Technique", G.L. Turi, IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 4, Jul. 84, pp. 548-562.
"A Digital Transmission Approach for Indoor Millimeter Waveband Systems", H. Lieb, Proc. of 2nd International Conference on Universal Personal Communications, Oct. 12-15, 1993, Ottawa, Ontario, Canada, pp. 880-884.
"One Chip Demodulator Using RF Front-End SAW Correlator for 2.4 GHz Asynchronous Spread Spectrum Modem", H. Nakase et al, Proc. of 5th IEEE International Symposium on Personal, Indoor, Mobile Radio Communications, The Hague, Netherlands, Sep. 94, pp. 374-378.
Kipens George Alfred
Leib Harry
Saw John Choo-Beng
Dougherty Thomas M.
Haley R. John
Northern Telecom Limited
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