Free-space optical code-division multiple-access system design

Lori L. Jeromin; John E. Kaufmann; Edward A. Bucher

doi:10.1117/12.149233

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6 August 1993 Free-space optical code-division multiple-access system design

Lori L. Jeromin, John E. Kaufmann, Edward A. Bucher

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Proceedings Volume 1866, Free-Space Laser Communication Technologies V; (1993) https://doi.org/10.1117/12.149233
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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.

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Lori L. Jeromin, John E. Kaufmann, and Edward A. Bucher "Free-space optical code-division multiple-access system design", Proc. SPIE 1866, Free-Space Laser Communication Technologies V, (6 August 1993); https://doi.org/10.1117/12.149233

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