Holographic code division multiple access

Details Holographic code division multiple access Holographic code division multiple access

1992-01-15

1993-06-01

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Fourier transform holography

359559, 382 31, 382 42, 364822, 364827, G03H 116

Patent

active

052165299

ABSTRACT:
A technique for all-optical Code Division Multiple Access (CDMA) system based on optical holography is disclosed. In this technique the energy of an incoming information light signal is spread over a spatial domain by a two-dimensional spatial encoder which includes a mask having regions of first and second transmission characteristics corresponding to the unique code assigned to a particular source. Subsequent decoding, which is accomplished by an optical matched filter through the use of a hologram, spatially despreads the energy of the information light signal and produces a focused light beam which serves as input to a code division detector.

REFERENCES:
patent: 3519322 (1970-07-01), Brooks et al.
patent: 4892370 (1990-01-01), Lee
"Psuedo-Random Sequences and Arrays", F. J. MacWilliams et al., Proceedings of the IEEE, vol. 64, No. 12, pp. 1715-1729, Dec. 1976.
"Signal Detection by Complex Spatial Filtering", A. Vander Lugt, IEEE Trans. of Info. Theory, IT 10:2, pp. 139-145, Apr. 1964.
"Introduction to Fourier Optics", J. W. Goodman, McGraw-Hill Book Company, pp. 171-177, 1968.
"Emerging Optical Code-Division Multiple Access Communications Systems", J. A. Salehi, IEEE Network Magazine, vol. 3, No. 2, pp. 31-39, Mar. 1989.
"Spread Spectrum for Commercial Communications", D. L. Schilling et al., IEEE Comm. Magazine, vol. 29, No. 4, pp. 66-79, Apr. 1991.
"Spread-Time Code Division Multiple Access", P. Crespo et al., Globecom '91, pp. 836-840, 1991.

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