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We formulate and study the thinnest path problem for secure communication in wireless ad hoc networks. The objective is to find a path from a source to its destination that results in the minimum number of nodes overhearing the message by a judicious choice of relaying nodes and their corresponding transmission powers. We adopt a directed hypergraph model of the problem and establish the NP-completeness...
With the development of electrical commerce, many applications require creating messages that can be proven to be authentic so that forged or invalid message can be detected. The digital signature is a convenient and efficient technique to achieve there requirements. In traditional public key system, the digital signatures require that the verifier verify the public key of a user before using the...
In the classic Bayesian restless multi-armed bandit (RMAB) problem, there are N arms, with rewards on all arms evolving at each time as Markov chains with known parameters. A player seeks to activate K ≥ 1 arms at each time in order to maximize the expected total reward obtained over multiple plays. RMAB is a challenging problem that is known to be PSPACE-hard in general. We consider in this work...
According to large misjudgment for making equalization to higher order Quadrature Amplitude (16QAM) signals by Constant Modulus Algorithm (CMA), the paper analyzes the character of 16 QAM signals constellation, proposes blind equalization algorithms based on coordinate transformation. In the proposed algorithm, output signal of equalizer is made coordinate transformation, the error function of Constant...
Blind source separation problem has recently received a great deal of attention in signal processing and unsupervised neural learning. In the current approaches, the additive noise is negligible so that it can be omitted from the consideration. To be applicable in realistic scenarios, blind source separation approaches should deal evenly with the presence of noise. In this contribution, we propose...
This paper proposes a blind equalization algorithm based on orthogonal wavelet and coordinate transformation by analyzing the character of 16-QAM signals constellations and orthogonal wavelet transform theory. In the proposed algorithm, a new error function of constant modulus algorithm (CMA) is obtained after making coordinate transformation to output signal of equalizer, the error function will...
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