Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Adaptive Modulation and Coding for Free-Space Optical Channels

Not Accessible

Your library or personal account may give you access

Abstract

Adaptive modulation and coding can provide robust and spectrally efficient transmission over terrestrial free-space optical channels. Three adaptive modulation schemes are considered in this paper: (i) variable-rate variable-power adaptation, (ii) channel inversion, and (iii) truncated channel inversion schemes. It is shown that a simple channel inversion scheme performs comparable to a variable-rate variable-power adaptation scheme in the weak turbulence regime but faces significant performance degradation in the strong turbulence regime. We further study adaptive coding based on large-girth quasi-cyclic low-density parity-check- (LDPC-) coded modulation. It is shown by simulation that deep fades of the order of 30dB and above in the regime of strong turbulence can be tolerated with the proposed scheme. It is demonstrated that communication in the saturation regime is possible with the proposed adaptive LDPC-coded modulation. We also determine the spectral efficiencies for the proposed adaptive modulation and adaptive coding schemes.

© 2010 Optical Society of America

Full Article  |  PDF Article
More Like This
On the communication over strong atmospheric turbulence channels by adaptive modulation and coding

Ivan B. Djordjevic and Goran T. Djordjevic
Opt. Express 17(20) 18250-18262 (2009)

LDPC coded OFDM over the atmospheric turbulence channel

Ivan B. Djordjevic, Bane Vasic, and Mark A. Neifeld
Opt. Express 15(10) 6336-6350 (2007)

LDPC-coded orbital angular momentum (OAM) modulation for free-space optical communication

Ivan B. Djordjevic and Murat Arabaci
Opt. Express 18(24) 24722-24728 (2010)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (23)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved