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A simple 4-state nonlinear trellis code with Gray-mapped QAM signals is designed which restricts certain symbol transitions in the constellation in order to shape the spectrum. The resulting spectral shaping subset selection code employs sign bit (most significant bit) coding, and is realized as a nonlinear binary convolutional code followed by an M-QAM modulator. The closed form of the power spectral...
A nonlinear binary code with a single carrier M-QAM linear modulation is designed to control certain transitions in the symbol constellation. This concept is employed to develop spectral shaping modulation codes with M-QAM linear modulations so as to reduce out-of-band power. The code is realized as a nonlinear binary convolutional code, and the coded modulation is represented as a Markov chain. The...
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