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We investigate the transmission of multiple correlated binary sources to a single destination over non-orthogonal Gaussian multiple access channels (MACs). By considering a binary codebook, we derive the admissible rate regions of the two-source Gaussian MAC. It is demonstrated that the admissible rate region increases as the correlation between the sources increases. Furthermore, we develop an iterative...
The paper is devoted to investigating the quality of reading vibration off the surface of objects by means of a method of digital speckle correlation. The optimal speckle pattern template size is determined to minimize the error of surface vibration measurement.
In a distributed video coding problem, use of a correct model for the correlation noise plays a significant role in improving the decoding performance and consequently in providing higher coding efficiency. In this work, we first study the predictive and additive correlation noise models at the DCT coefficient band level for transform-domain distributed video coding. Then, bounds on compression rates...
Functional Magnetic Resonance Imaging (fMRI) methods produce high dimensional representation of cognitive processes under heavy noise due to the limitations of hardware and measurement techniques. In order to reduce the noise and extract useful information from the fMRI data, a sequence of pre-processing techniques, such as smoothing with spatial filters and z-scoring, are used. In this study, we...
In this work we consider asymmetric correlation channels and focus on the achievability of the rate-distortion function when the source is binary uniform. This lies in contrast with conventional symmetric correlation channel models employed in the literature. The rate-distortion function for binary source coding with correlated side information is expressed as a function of an auxiliary random variable...
In this paper, we investigate low-complexity, receiver-driven strategies for the transmission of two correlated sources in a multiple access quasi-static fading channel. We consider two different transmission modes at the physical (PHY) layer depending on the average signal to noise ratio (SNR) of the involved Rayleigh fading channels. The two modes that are allowed are orthogonal transmissions and...
Motivated by the correlation channel modeling problem in practical applications, such as distributed video coding, we study the binary source coding of a uniform source with side information, under asymmetric correlation channel assumptions. First, we consider the case where side information is available to both the encoder and decoder, and give an analytical formula for the rate-distortion bound...
Thanks to the increasing number of images stored in the cloud, external image redundancies can be leveraged to efficiently compress images by exploiting inter-images correlations. In this paper, we propose a novel cloud-based image coding scheme. Unlike current state-of-the-art systems, our method relies on a data dimensionality reduction technique. A global compensation is associated to a locally-weighted...
A multi-service (MS) code based Spectral Amplitude Coding-Optical Code Division Multiple Access (SAC-OCDMA) system at different number of basic user, typically suitable for video, audio and data transmission is experimentally investigated. The work is carried out to show the feasibility of the previous work that has been demonstrated using mathematical computation. The obtained results indicate that...
We study a caching problem that resembles a lossy Gray-Wyner network: A source produces vector samples from a Gaussian distribution, but the user is interested in the samples of only one component. The encoder first sends a cache message without any knowledge of the user's preference. Upon learning her request, a second message is provided in the update phase so as to attain the desired fidelity on...
Information transmission over channels with transceiver distortion is investigated via generalized mutual information (GMI) under Gaussian input distribution and nearest-neighbor decoding. A canonical transceiver structure in which the channel output is processed by a minimum mean-squared error estimator before decoding is established to maximize the GMI, and the well-known Bussgang's decomposition...
As a 3D video extension of Audio Video Coding Standard (AVS), 3D-AVS is being developed to improve the coding efficiency of multi-view video. Since multi-view video is composed of projections of the same scenery from different viewpoints at the same time instant, it contains a large amount of inter-view redundancies. To exploit the inter-view correlation, this paper presents a method to derive the...
This paper proposes a distributed compressive sensing (CS) scheme for robust image transmission over unknown or time-varying channels with highly correlated images at the decoder. A compressed thumbnail is first transmitted after digital forward error correction (FEC) and modulation to retrieve highly correlated images and generate a side information (SI) at the decoder. The current residual image...
Multichannel elctrocardiogram (MECG) signals are correlated both in spatial domain as well as in temporal domain and this correlation is stronger at multiscale levels (Fig. 1). To exploit this correlation in compressed sensing (CS) based ECG tele-monitoring systems, a joint multiscale compressed sensing (JMCS) technique is proposed in this work. CS is a novel signal acquisition/reconstruction paradigm...
The video captured by different visual sensor in a visual sensor network is first compressed using the block-based compressive sensing algorithm. All the videos are encoded independently at different sub-rates and transmitted to a host workstation for reconstruction. Then, the proposed multi-phase joint reconstruction framework is applied to improve the reconstruction of lower subrate videos. In this...
In this paper, a novel Joint Source-Channel Coding scheme based on Irregular Repeat-Accumulate codec is proposed for the transmission of Hidden Markov Source in AWGN scenarios. The encoder structure of the scheme consists of two units, one for source assign and another for encode. The simulation results demonstrate that the proposed scheme have better compression performance than the traditional code...
Advancing over up-to-date information theoretic results that assume symmetric correlation models, in this work we consider the problem of lossy binary source coding with side information, where the correlation is expressed by a generic binary asymmetric channel. Specifically, we present an in-depth analysis of rate distortion with side information available to both the encoder and decoder (conventional...
This paper proposes frame-by-frame speech recognition as a hardware decoder on Field Programmable Gate Arrays (FPGAs). As a first step for FPGA implementation, Voice Activity Detection (VAD) using second order autocorrelation and a speech recognition decoder using formant frequency distances were evaluated. The hardware decoding was then implemented on an FPGA emulator. The VAD and decoder were demonstrated...
We propose a linear precoder for the layered space-time block coding system [2] over spatially correlated channels with channel covariance matrix feedback at the transmitter. The precoder is a combination of the well known waterfilling solution and the precoder for spatial multiplexing system that minimizes the probability of decoding error. At the receiver, decoding schemes of group zero-forcing...
In this paper, a novel iterative equalizer applying soft feedback is introduced, the 2 symbols ISDIC (2S ISDIC) equalizer. The 2S ISDIC is the first equalizer that bridges the gap between the low complexity ISDIC equalizer which has poor performance, to the high complexity inverse channel equalizing methods, such as the LMMSE and the MMSE ISDIC equalizers, which have better performances. The 2S ISDIC...
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