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Proceedings Paper

Free-space optical code-division multiple-access system design
Author(s): Lori L. Jeromin; John E. Kaufmann; Edward A. Bucher
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Paper Abstract

This paper describes an optical direct-detection multiple access communications system for free-space satellite networks utilizing code-division multiple-access (CDMA) and forward error correction (FEC) coding. System performance is characterized by how many simultaneous users operating at data rate R can be accommodated in a signaling bandwidth W. The performance of two CDMA schemes, optical orthogonal codes (OOC) with FEC and orthogonal convolutional codes (OCC), is calculated and compared to information-theoretic capacity bounds. The calculations include the effects of background and detector noise as well as nonzero transmitter extinction ratio and power imbalance among users. A system design for 10 kbps multiple-access communications between low-earth orbit satellites is given. With near- term receiver technology and representative system losses, a 15 W peak-power transmitter provides 10-6 BER performance with seven interfering users and full moon background in the receiver FOV. The receiver employs an array of discrete wide-area avalanche photodiodes (APD) for wide field of view coverage. Issues of user acquisition and synchronization, implementation technology, and system scalability are also discussed.

Paper Details

Date Published: 6 August 1993
PDF: 13 pages
Proc. SPIE 1866, Free-Space Laser Communication Technologies V, (6 August 1993); doi: 10.1117/12.149233
Show Author Affiliations
Lori L. Jeromin, Lincoln Lab./MIT (United States)
John E. Kaufmann, Lincoln Lab./MIT (United States)
Edward A. Bucher, Lincoln Lab./MIT (United States)


Published in SPIE Proceedings Vol. 1866:
Free-Space Laser Communication Technologies V
G. Stephen Mecherle, Editor(s)

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