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Punctured Bent Function Sequences for Watermarked DS-CDMA
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DOI：10.1109/LCOMM.2019.2915080.png)
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Abstract
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In this letter, we investigate the effect of inserting some randomly generated watermarking chips into known spreading sequences in terms of periodic correlations; moreover, we give tvvo design criteria for good watermarked sequences in the sense of: 1) reducing the average correlation value and 2) minimizing the variance of correlations. For n = 2in with even Tri, we propose a set of 2` 1 punctured bent function sequences of length 2 1 punctured by the Singer difference set. The maximum non -trivial correlation magnitude of the proposed set turns out to be 2m + 1, which is asymptotically two times the Welch bound.
Keywords:
DS-CDMA
watermarked sequences
bent function sequences
punctured sequences
periodic correlations
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