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This chapter discusses coding techniques for bandwidth-limited AWGN channels, where large signal constellations such as M-PAM must be used. The total coding gain of a coded modulation scheme has two components: a coding gain from dense signal packing, and a shaping gain from using a nonuniform probability distribution. At high SNR, coding and shaping can be separated. Lattices and trellis codes are the main classes of codes considered, as they provide moderate coding gains with moderate complexity. Trellis

Author

Ngoc Minh

Language

EN