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An LDPC coded BICM-ID scheme with nonuniform signaling is proposed, which is designed by mapping a variable-length prefix code onto the constellation. By using the Huffman procedure, prefix code is designed to approach the optimal performance. We demonstrate that proposed nonuniform signaling scheme outperforms LDPC-coded 8-QAM by at least 0.8 dB.
© 2015 Optical Society of America
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