For separating multiple speech signals given a convolutive mixture, time-frequency sparseness of the speech sources can be exploited. In this paper we present a multi-channel source separation method based on the concept of approximate disjoint orthogonality of speech signals. Unlike binary masking of singlechannel signals as e.g. applied in the DUET algorithm we use a likelihood mask to contro...

The paper presents a method of creating hidden channel using signals’ superposition. According to this idea, transmitter simultaneously sends overt and covert (secret) signals, whereby the signal is carrier for one. Due need ensure low probability detection communication, should have power. This implies number problems relating its correct reception. similar non-orthogonal multiple access (NOMA...

ORTHOGONAL AND SYMMETRIC HAAR WAVELETS ON THE THREE-DIMENSIONAL BALL Andy Chow Master of Science Graduate Department of Computer Science University of Toronto 2010 Spherical signals can be found in a wide range of fields, including astronomy, computer graphics, medical imaging and geoscience. An efficient and accurate representation of spherical signals is therefore essential for many applicati...

The modes delivered by proper orthogonal decomposition (POD) are uncorrelated as per definition; but interestingly, they not necessarily independent in terms of spatio-temporal flow-pattern dynamics. For instance, periodic structures that travel waves through a series snapshots often consist pairs with harmonic functions shifted 90 degree phase and/or spatial offset quarter the wave length conv...

We propose a multi-carrier orthogonal CDMA signaling scheme for a multiple-access communication system, such as the reverse channel of a cellular network, as an alternative to the multiuser interference cancellation approach. The average variance of cross-correlations between sequences is used as a measure for sequence design. We search for sets of sequences that minimize the probability of sym...

The control and thus sensing of radiation from three-dimensional noise sources has become a topic of strong interest as investigation moves away from the laboratory. Furthermore, the advance in signal processing power has facilitated the real-time fusion of a large number of sensor signals, which are typically required to give an accurate estimate of global error signals. Current state-of-the-a...

Orthogonal frequency division multiplexing with index modulation (OFDM-IM), stands out among conventional communication technologies, as it uses the indices of available transmit entities. Thanks to such an approach, offers a novel method for transmission extra data bits. Recent years have seen great interest in chaos-based communications. The spectrum-spreading signals used chaotic signal tech...