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This paper presents a new approach for digital image watermarking and for transmission of watermarked images over bursty wireless channels. In this approach, biorthogonal wavelet transform based method is proposed for digital image watermarking and turbocoded JPEG2000 is proposed for correction of transmission errors due to the bursty wireless channels. The proposed approach is corroborated with implementation...
Chaotic maps have been widely used in data encryption. However, a number of chaos-based algorithms have been shown to be insecure. The application of BB equation for encryption is reported in a very recent article. In this paper, new algorithms based on chaos and BB equation are proposed for data encryption and decryption. Cryptanalysis of the proposed encryption algorithm is provided. The proposed...
In the modern method of equalization, the problem of multiple-input multiple-output (MIMO) finite-impulse-response (FIR) channel equalization boils down to finding the MIMO FIR inverses. This correspondence proposes and proves a theorem that states the condition for the existence of these inverses, which are also FIR. A numerical example is provided to illustrate how the FIR inverses can be evaluated...
In many realistic wireless channels the ambient noise is known through experimental measurements to be decidedly non-Gaussian, due largely to impulsive phenomenon. Frequently, code-division multiple-access (CDMA) transmissions are made over fading channels. This paper deals with the problem of multiuser detection in direct-sequence CDMA fading channels with impulsive noise. The robustification is...
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