LDPC Coded PPM and Iterative Detection for Free-Space Optical Links

Abstract:

The pulse position modulation, which has the advantage of average energy efficiency and bandwidth efficiency, is an attractive modulation scheme for free-space optical communication. An important practical issue is to employ an efficient channel coding to this modulation. In this view, we consider the use of low density parity-check code together with iterative soft demodulation and channel decoding at the receiver. In particular, we discuss the calculation of the soft information at the demodulator to accommodate the LDPC decoder. We show that the proposed scheme is quite efficient against demodulation errors due to the receiver noise.

• Periodical: Applied Mechanics and Materials (Volumes 651-653)
• Pages: 444-450
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.651-653.444
• Online since: September 2014
• Authors: Xiao Jian Liu, Wei Xu, Jue Wang*
• Keywords: Free Space Optics, Iterative Detection, LDPC Codes, Pulse Position Modulation

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