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In this paper, we apply advanced encryption standard (AES) to improve the security of chaotic cognitive radio (CCR) system. More specifically, we propose to encrypt the information with AES, then the AES-encrypted information is modulated by frequency domain based chaos sequences and transmitted over the non continuous subcarriers sensed by the CCR. Both the transmitter and the receiver share the...
This paper studies the problem of single-channel noise reduction in the time domain, where an estimate of a vector of the desired clean speech is achieved by filtering a frame of the noisy signal with a rectangular filtering matrix. The core issue with this problem formulation is then the estimation of the optimal filtering matrix. The squared Pearson correlation coefficient (SPCC) is used. We show...
This paper studies the problem of single-channel noise reduction in the time domain. Based on some orthogonal decomposition developed recently and the squared Pearson correlation coefficient (SPCC), several noise reduction filters are derived. We will show that the optimization of the SPCC leads to the Wiener, minimum variance distortionless response (MVDR), minimum noise (MN), minimum uncorrelated...
Multiple independent Rayleigh fading waveforms are often required for the simulation of wireless communication channels. Jakes model and its derivatives based on SoS (Sum-of-Sinusoids) provide simple simulators for Rayleigh fading, but they have shortcomings that their correlation functions are not always approach theoretical value. In this paper, the statistical properties of SoS fading model with...
This paper describes a dynamic multi-target simulating system for active sonar, a system for simulating the signal received by multiple receive hydrophones of sonar for a scenario with multiple targets from different directions. Significant challenges in the system design are the capabilities of real-time processing and high-speed data transmission. Due to the demand of the system, the embedded soft...
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