Channel Capacity Analysis of the Multiple Orthogonal Sequence Spread Spectrum Watermarking in Audio Signals


Spread spectrum techniques have recently been widely used in digital audio watermarking. In this paper, the multiple orthogonal sequence unfold spectrum watermarking scheme for audio signals is presented, where multiple orthogonal sequences are used to embed parallel watermarks to improve the channel capacity. The channel capability for the proposed theme comes, and the optimum variety of the sequence for the maximal channel capability is obtained. The analysis shows that the channel capability of the proposed theme is larger than that of the existing improved spread-spectrum (ISS) scheme.

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