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Coded Modulation

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Coding for Optical Channels

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Abstract

In this chapter, we describe how to optimally combine modulation with channel coding, and describe several coded-modulation schemes: (a) multilevel coding (MLC) [1–4], (b) multidimensional coded modulation [5, 6], and (c) coded orthogonal frequency division multiplexing (OFDM) [7–12]. Using this approach, modulation, coding, and multiplexing are performed in a unified fashion so that, effectively, the transmission, signal processing, detection, and decoding are done at much lower symbol rates. At these lower rates, dealing with the nonlinear effects and polarization mode dispersion (PMD) is more manageable, while the aggregate data rate per wavelength is maintained above 100 Gb/s. The chapter is organized as follows. In Sect. 6.1 we describe M-ary quadrature amplitude multiplexing (QAM) [13, 14], M-ary phase shift keying (PSK), and an optimum signal constellation in minimum mean-square error (MMSE) sense [15]. In Sect. 6.2 we describe MLC, in which the component block codes have different code rates, and bit-interleaved coded modulation (BICM), in which all component codes have the same code rate. In Sect. 6.3 we describe multidimensional coded modulation as an efficient way to increase the spectral efficiency. In Sect. 6.4 we describe coded OFDM as an efficient way to compensate simultaneously for chromatic dispersion (CD) and PMD, and to increase the spectral efficiency.

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Authors and Affiliations

  1. Department of Electrical & Computer Engineering, University of Arizona, Tucson, AZ, 85721, USA

    Ivan Djordjevic, William Ryan & Bane Vasic

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  1. Ivan Djordjevic
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  2. William Ryan
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  3. Bane Vasic
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Correspondence to Ivan Djordjevic .

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Djordjevic, I., Ryan, W., Vasic, B. (2010). Coded Modulation. In: Coding for Optical Channels. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5569-2_6

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  • DOI: https://doi.org/10.1007/978-1-4419-5569-2_6

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  • Print ISBN: 978-1-4419-5568-5

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