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In this paper, the principle of normalized minimum-sum (NMS) polar decoding process is explored. It is demonstrated that with one properly chosen parameters for NMS algorithm, performances approach to that of the sum-product (SP) algorithm can be achieved. As well, the complexity reduction is realized by calculating a linear function instead of nonlinear function. Simulation results for successive...
In this article, the design of secure lattice coset codes for general wireless channels with fading and Gaussian noise is studied. Recalling the eavesdropper's probability and information bounds, a variant of the latter is given from which it is explicitly seen that both quantities are upper bounded by (increasing functions of) the expected flatness factor of the faded lattice related to the eavesdropper...
This paper proposes a new model called \emph{spatial continuum asymmetric channels} to study the channel capacity region of asymmetric scenarios in which either one source transmits to a spatial density of receivers or a density of transmitters transmit to a unique receiver. This approach is built upon the classical broadcast channel (BC) and multiple access channel (MAC). For the sake of consistency,...
In this paper, we investigate the impact of an arbitrary number of Rayleigh faded co-channel interferers with arbitrary powers on the performance of dual-hop transmission systems that employ amplify-and-forward relays. The received signals at the relay and destination undergo independent but not necessarily identical Nakagami-m fading. Analytical expressions for the exact and asymptotic outage probability...
In this paper, we investigate the performance of a distributed space-time coding based hybrid satellite- terrestrial cooperative network (DSTC-HSTCN), where both the satelliterelay and satellite-destination links undergo the Shadowed-Rician fading, whereas the relay-destination link follows the Rayleigh fading. In particular, we address the problem in a downlink distributed Alamouti coded satellite...
In this paper, we present two approaches of the image texture pretreatment. The reason behind it is to reduce the number of the grey level in the image, by assigning to each pixel a value that characterizes the local information of the neighborhood of this same pixel. This coding process will allow us to reduce the size of the co-occurrence matrix and also minimize the extraction time of Haralick...
Channel coding techniques are widely applied to improve the reliability of high-speed terrestrial free-space optical (FSO) communication links, which are subjected to the atmospheric turbulence-induced signal fading. Since the channel variation is slow, the system performance can be further improved by using the instantaneous channel state information (CSI) at the receiver. The performance of a coding...
The aim of our work is to realize the implementation of a real-time image rotation on FPGA's board. The method we used is based on a B-spline interpolator. The integration capicity of FPGAs is relatively weak, so the difficulty in this problem is to determine the right coding of the rotation filter while keeping a good accuracy on filtering output. In this article, we remind a few definitions about...
Polar codes have a regular recursive structure which is feasible for hardware implementation in practice. Quantization is a critical issue in hardware implementation. In this paper, a quantization scheme for successive-cancellation (SC) decoding of polar codes is proposed based on the equivalent channel cutoff rate optimization. Moreover, a modified Gaussian approximation (GA) method exploiting the...
An UNB pattern of increasing sampling frequency is proposed. M-ary amplitude and M-ary VMSK (MVMSK) CoDec of UNB communication are presented to illustrate the UNB pattern. The UNB pattern can be used for deep space TT&C communication to improve its performance.
Orthogonal waveform design is quite an important issue for waveform diversity systems. A chaos based method for orthogonal discrete frequency coding waveform (DFCW) design is proposed in this paper to overcome the insufficient orthogonal waveforms and their finite coding length. Correlation properties of the designed signals are analyzed. Premises for chaos choosing and frequency quantification method...
This paper reports a novel method on the probability of symbol error estimation for high speed Multi Slot Amplitude Coding (MSAC) technique in optically amplified communication system. The system setup is based on simple intensity modulation and direct detection scheme which is cost effective. In this proposed method, possibility of symbol error is estimated based on individual probability density...
This paper discusses RF-PWM for mobile communication applications focusing on maximal achievable coding efficiency. Coding efficiency is one of the most crucial metrics in evaluating modulation concepts for switch mode amplification. It is shown that the achievable efficiency is mostly dependent on the chosen modulator waveform and the magnitude probability density function of the wanted signal. We...
Distributed space time coding (DSTC) is an efficient way to exploit spatial diversity for cooperative system. In regular cooperative diversity networks, relays forward the source signal to the destination every time regardless of the channel conditions which limits the system throughput. In this paper, we propose an incremental relaying protocol based on decode and forward transmission in conjunction...
This paper considers a multicast scenario and compares the average reception quality obtained when combining multiple description coding (MDC) and network coding (NC). Plain (single description) network coding (NC-SDC) serves as reference. In the considered scenario, a single source is multicast to several receivers with various channel conditions. Contrary to a NC-SDC scheme, unable to recover the...
In this paper, the Interference Network with General Message Sets (IN-GMS) is introduced in which several transmitters send messages to several receivers: Each subset of transmitters transmit an individual message to each subset of receivers. For such a general scenario, an achievability scheme is presented using the random coding. This scheme is systematically built based on the capacity achieving...
In this paper, we propose a novel scheme for dynamically reducing the computational complexity of MVC. Our scheme exploits the coding mode correlation available in the 3D-neighborhood (i.e., spatial, temporal, and view) along with the rate-distortion properties of the neighboring Macroblocks. Our scheme incorporates a multi-level mode decision process based on a mode-ranking mechanism that categorizes...
Multi-view video coding by using the hierarchical B picture structure utilizes intra-view and inter-view predictions to reduce redundant information. The best coding mode is determined by exhaustively searching over all possible partition modes using rate distortion comparison in motion estimation for each macroblock. However, there is a high computational complexity in exhaustive searching. This...
Biometrie discretization converts extracted biométrie features into a binary string via a process of segmenting every one-dimensional feature space into possibly distinct multiple intervals and encoding every interval-captured feature element correspondingly. Eventually, the individual binary output of every feature element is concatenated into a binary string. To the best of our knowledge, Detection...
In this work a novel scheme is proposed for adaptive early SKIP mode decision in the multiview video coding based on mode correlation in the 3D-neighborhood, variance, and ratedistortion properties. Our scheme employs an adaptive thresholding mechanism in order to react to the changing values of Quantization Parameter (QP). Experimental results demonstrate that our scheme provides a consistent time...
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