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The minimum squared weight (MSW) criterion has been shown to yield excellent performance for DC-free multimode codes in terms of coding efficiency. However, it is demonstrated that the MSW criterion is not sufficient to guarantee the generation of DC-free sequences. To overcome this drawback, a modified MSW criterion is proposed that integrates the MSW criterion with a word-end running digital sum constraint that ensures DC balance.
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Zhu et al. (2005) studied this question.
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