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In this letter, a spectral sidelobe-decaying property of the Walsh-Hadamard code employed in multicarrier codedivision multiple access (MC-CDMA) systems is exploited. It is shown that the sidelobe-decaying characteristic of the MC-CDMA signal can be properly described by the code index of the underlined Walsh-Hadamard codeword.Index Terms-Multicarrier code-division multiple access, spectral sidelobe, Walsh-Hadamard code, orthogonal frequencydivision multiplexing.

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