Search results for: Ch. Gangadhar
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A wireless sensor system is an essential aspect in many fields. It consists of a great deal of sensor nodes. These sensor networks carry out a number of tasks, including interaction, distribution, recognition, and power supply. Data is transmitted from source to destination and plays an important role. Congestion may occur during data transmission from one node to another and also at cluster head...
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Circuits, Systems, and Signal Processing > 2018 > 37 > 5 > 2194-2205
Due to the sparse multipath characteristic of the channel, millimeter wave (mmWave) channel estimation can be treated as a sparse signal recovery problem. By exploiting the channel sparse characteristics with compressive sensing (CS) theory, sparse signal recovery algorithms can be used for channel estimation. Orthogonal matching pursuit (OMP) algorithm is one of the most popular CS reconstruction...
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Complex numbers multiplication is a key arithmetic operation to be performed with high speed and less consumption of power in high performance systems such as wireless communications. Hence, in this paper, two possible architectures are proposed for a Vedic real multiplier based on the URDHVA TIRYAKBHYAM (Vertically and cross wise) sutra of Indian Vedic mathematics and an expression for path delay...
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Chaos based encryption may offer new quality in secure data transmission. A recently proposed chaotic-key based algorithm(CKBA) has been shown to be unavoidably susceptible to chosen/known-plaintext attacks and ciphertext-only attacks. In this paper , a new algorithm based on modified chaotic-key based algorithm (MCKBA) and finite field wavelet packet division multiplexing (FFWPDM) is proposed for...
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Chaos based encryption may offer new quality in secure data transmission. A recently proposed chaotic-key based algorithm(CKBA) has been shown to be unavoidably susceptible to chosen/known-plaintext attacks and ciphertext-only attacks. In this paper finite field discrete wavelet transform and modified chaotic-key based algorithm(FFDWT-MCKBA) is proposed to enhance the security of CKBA. Further, VLSI...
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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 recent article. In this paper, new algorithms based on chaos and BB equation are reported for image encryption and decryption. The algorithms are illustrated through an example. For practical use, VLSI architectures...
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Chaos based encryption may offer new quality in secure data transmission. A recently proposed chaotic-key based algorithm (CKBA) has been shown to be unavoidably susceptible to chosen/known-plaintext attacks and ciphertext-only attacks. In this paper, modified chaotic-key based algorithm (MCKBA) is proposed to enhance the security of CKBA. The enhanced security of the proposed algorithm is analyzed...
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Many real life systems such as satellite communications, magnetic recording channels and physiological processes exhibit nonlinear characteristics. Truncated Volterra expansions such as the second order Volterra filter is a versatile approach for modeling such systems. In this paper, it is shown that the single-input multi-output (SIMO) FIR second Volterra channels can be equalized using the linear...
