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We study a classic problem in wireless data communications in which receivers generally rely on training pilots for equalization of multi-path dispersive channel distortions. Traditional equalizers often require a substantial number of pilot symbols for effective channel compensation. To conserve limited channel bandwidth, we investigate novel equalization algorithms that can make more efficient use...
We elaborate on the possibility of exploiting the (pseudo)random projection operator, which is at the heart of the most common architecture for compressed sensing, to prevent access to the acquired information by unauthorized receivers. In low-resource applications, this approach may make dedicated cryptographic layers unnecessary when the security requirement is not particularly high. Beyond proving...
This paper addresses the set-membership filtering problem with communication constraints for a class of discrete time-varying systems in the presence of unknown-but-bounded process and measurement noises. The dynamic coder and decoder are proposed to model the digital communication channel to transmit the error between the current measurement output and the last time quantized measurement output rather...
We consider a two-user interference channel in the context of a cellular network, where two base stations would like to communicate with their respective mobile stations. The goal of this work is to investigate the throughput gain with the use of an infrastructure relay installed at the cell border. We propose a scheme that features rate-splitting at the sources and partial decode and forward at the...
Turbo codes interleaver logic is analyzed in Digital Magnetic Recording (DMR) Partial Response (PR) channels environment. The performances of turbo encoding/decoding process are estimated, in the presence of appropriate DMR noise, generally a particulate noise, manifested as burst errors of various intensities and dimensions. Depending of interleaver, turbo code performance (Bit Error Rate BER) is...
A novel noise whitening method for compensating the performance loss due to spatially-colored noise in the presence of polarization-dependent impairments is proposed. The proposed algorithm is general for all single carrier, WDM, and OFDM systems.
Cost-effective, asynchronous 4 ONUs OOK-OCDM-based 10G-PON system using a novel multiple access noise suppression at RN and its 50km-SMF transmission without dispersion compensation is experimentally demonstrated for the first time.
This paper examines the problem of decoding a unique CAPTCHA that has very high noise levels with only partially visible symbols with variable spacing but no skewing. An ingenious method for decoding is proposed that starts with preprocessing the image and identifies symbols first before removing them from the image, unlike a number of existing methods. The algorithm is expected to be very fast owing...
This paper proposes a new fingerprinting decoder based on the Markov Chain Monte Carlo (MCMC) method. A Gibbs sampler generates groups of users according to the posterior probability that these users could have forged the sequence extracted from the pirated content. The marginal probability that a given user pertains to the collusion is then estimated by a Monte Carlo method. The users having the...
In this paper we design a backhaul scheme for uplink cooperation, which is based on distributed source coding (DSC). With this backhaul scheme, base stations cooperatively serve the cell edge users in order to improve their performance. In cooperative uplink, both cooperating BS and serving BS receive signal from cell edge users, the cooperating BS decodes cell edge users firstly, and sends the syndrome...
A new video coding standard, High Efficiency Video Coding (HEVC), is currently under development. In this paper we propose two relatively low-complex adaptive Wiener schemes for efficient P-frame coding of noisy videos with HEVC. In the proposed inloop denoising framework the reference frame is noise filtered for P-frame prediction. The introduced algorithms adapt to the HEVC coding structure and...
In this paper, we propose a model of Long-reach Passive Optical Network (LR-PON) using multi-wavelength optical code-division multiplexing (OCDM) and Erbium-doped fiber amplifier (EDFA). In addition, we analyze the effects of EDFA noise on the performance of OCDM-based LR-PON. Other noise and interference such as shot noise, thermal noise, beat noise, and multiple-access interference (MAI) are included...
We describe a method of embedding imperceptible codes, that are for structured light sensing (SLS), into regular display in video projection. To resolve the conflict between imperceptibility of the embedded codes and feasibility and robustness of SLS code retrieval, we introduce antinoise schemes to the coding and decoding stages simultaneously. On one hand, specially designed primitive shapes and...
Using coding artificial point can match the homonymy points during multiple images automatically in the photogrammetry. A method of identifying and locating 8 bits encoded points automatically has been presented in this paper. The experimental results show that the accuracy of center coordinate of encoding point reaches sub-pixel level. And decoding method is simple. The robust of decoding and recognition...
In this paper we address the problem of allowing secondary access to the spectrum assigned to a broadcast operator. We assume that the secondary transmitter knows of the primary message but is not able to apply interference cancellation techniques due to the lack of channel state information. Thus, interference cancellation can only be performed at the secondary receivers, provided they are able to...
Optimal quantizers for channel output are especially necessary for very high speed and memory-cell sensing applications where high-precision analog-to-digital converters are not available. This paper investigates a method to find optimal output quantizers for a binary input (BI) additive white Gaussian noise (AWGN) channel when regular low-density parity-check (LDPC) codes are used with belief-propagation...
The Maximum Likelihood (ML) detector is a detection criteria which yields an optimal solution to Multiple-Input Multiple-Output (MIMO) systems but however, at the expense of its NP-hard complexity. Instead, the Sphere Decoder (SD) was proposed as an efficient algorithm for finding the solution to the ML detection problem in MIMO digital communication systems. Unlike the ML detector whose complexity...
The development of many high bit-rate multimedia applications has emphasized the demand for service differentiation or prioritization techniques to ensure end-user quality-of-service (QoS) necessities. This paper focuses on utilizing different detection schemes in spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems to support ‘triple-play’ services (voice, video, and...
We employ polar codes as the building blocks of Construction D to construct lattices for the additive white Gaussian noise (AWGN) channel. The construction of these component polar codes is based on the idea of Pedarsani et al. for binary-input memoryless symmetric (BMS) channels. Our lattice construction takes the advantage of the performance gain of polar codes over Reed-Muller codes. Simulation...
In order to decrease impact of noise caused by nanometer devices and cosmic radiation in image processing area, stochastic computing system is proposed as a high fault tolerant computing structure. Implementation of image averaging is used to illustrate the advantages of stochastic computing, and both traditional computing architecture and stochastic computing architecture are implemented with TSMC...
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