Reciprocal saw correlator method and apparatus

Details Reciprocal saw correlator method and apparatus Reciprocal saw correlator method and apparatus

1990-08-06

1992-01-14

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

H04L 2730

Patent

active

050816420

ABSTRACT:
A surface-acoustic-wave correlator for decoding a spread-spectrum signal having a data signal modulated with a plurality of chip sequences and reciprocal-chip sequences. A tapped-delay-line has a plurality of taps defining a tapped-delay-line structure matched to the chip sequence. In response to a plurality of first chips and second chips embedded in the spread-spectrum signal, the tapped-delay line generates TDL-chip sequences and inverse-TDL-chip sequences. A first transducer is acoustically coupled to the tapped-delay-line. In response to the spread-spectrum signal modulated by the chip sequence, the first transducer correlates a first group of the plurality of TDL-chip sequences and inverse-TDL-chip sequences and outputs a first correlation pulse. A second transducer is acoustically coupled to the tapped-delay-line. In response to the spread-spectrum signal modulated by the reciprocal-chip sequence, the second transducer correlates a second group of the plurality of TDL-chip sequences and inverse-TDL-chip sequences and outputs a second correlation pulse. In response to the first correlation pulse and the second correlation pulse, a decision circuit outputs the first bit and the second bit, respectively.

REFERENCES:
patent: 3978436 (1976-08-01), Alig et al.
patent: 4021898 (1977-05-01), Willis et al.
patent: 4051448 (1977-09-01), Coussot
patent: 4100498 (1978-07-01), Alsup et al.
patent: 4131484 (1978-12-01), Caruso et al.
patent: 4163944 (1979-07-01), Chambers et al.
patent: 4217563 (1980-07-01), Vale
patent: 4247942 (1981-01-01), Hauer
patent: 4314393 (1982-02-01), Wakatsuki et al.
patent: 4418393 (1983-11-01), Zscheile, Jr.
patent: 4432089 (1984-02-01), Wurzburg et al.
patent: 4445256 (1984-05-01), Huguenin et al.
patent: 4456793 (1984-06-01), Baker et al.
patent: 4484028 (1984-11-01), Kelley et al.
patent: 4517679 (1985-05-01), Clark et al.
patent: 4525835 (1985-06-01), Yance et al.
patent: 4550414 (1985-10-01), Guinon et al.
patent: 4561089 (1985-12-01), Rouse et al.
patent: 4562370 (1985-12-01), Van Dach
patent: 4567588 (1986-01-01), Jerrim
patent: 4569062 (1986-02-01), Dellande et al.
patent: 4601047 (1986-07-01), Horwitz et al.
patent: 4606039 (1986-08-01), Nicolas et al.
patent: 4621365 (1986-11-01), Chiu
patent: 4622854 (1986-11-01), Locke et al.
patent: 4642505 (1987-02-01), Arvanitis
patent: 4647863 (1987-03-01), Skudera et al.
patent: 4649549 (1987-03-01), Halpern et al.
patent: 4653069 (1987-03-01), Roeder
patent: 4660164 (1987-04-01), Leibowitz
patent: 4672254 (1987-06-01), Dolat et al.
patent: 4672658 (1987-06-01), Kavehrad et al.
patent: 4680785 (1987-07-01), Akiyama et al.
patent: 4691326 (1987-09-01), Tsuchiya
patent: 4701907 (1987-10-01), Darcie
patent: 4703474 (1987-10-01), Foschini et al.
patent: 4707839 (1987-11-01), Andren et al.
patent: 4718080 (1988-01-01), Serrano
patent: 4724435 (1988-02-01), Moses et al.
patent: 4745378 (1988-05-01), Niitsuma et al.
patent: 4754473 (1988-06-01), Edwards
patent: 4759034 (1988-07-01), Nagazumi
patent: 4759078 (1988-07-01), Schiller
patent: 4769812 (1988-09-01), Schimizu
patent: 4804938 (1989-02-01), Rouse et al.
patent: 4805208 (1989-02-01), Schwartz
patent: 4807222 (1989-02-01), Amitay
patent: 4815106 (1989-03-01), Propp et al.
patent: 4833702 (1989-05-01), Shitara et al.
patent: 4837802 (1989-06-01), Higashiyama et al.
patent: 4860307 (1989-08-01), Nakuyama
patent: 4894842 (1990-01-01), Broekhaven et al.
IEEE Communications Magazine, Jun. 1987, vol. 25, No. 6, pp. 32-40, entitled Spread Spectrum for Indoor Digital Radio, by M. Kavehrad and P. J. McLane.
AT&T Technical Journal, Oct. 1985, vol. 64, No. 8, pp. 1927-1965, entitled Performance of Low-Complexity Channel Coding and Spread Spectrum in Indoor Wireless Communication, by M. Kavehrad and McLane.
Applications of Spread Spectrum Radio to Indoor Data Communications, by Ralph Eschenbach, pp. 34.5-1-34.5-3.
Applications of Spread-Spectrum Radio to Wireless Terminal Communications, by Payne Freret, Ralph Eschenbach, Dick Crawford, and Paul Braisted, pp. 69.7.1-69.7.4.
Wireless Terminal Communications Using Spread-Spectrum Radio, by Payne Freret, pp. 244-248.
IEEE Communications Magazine, Feb. 1987, vol. COM-35, No. 2, p. 224, entitled Direct-Sequence with DPSK Modulation and Diversity for Indoor Wireless Communications, by Mohsen Kavehrad, and Bhasker Ramamurthi.
pp. 230-232 from the Book Spread Spectrum by Robert C. Dixon.

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