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Lattice reduction (LR) has emerged as a popular technique to improve the performance of many low complexity MIMO detectors. Among the existing LR algorithms, the LLL algorithm has been applied to MIMO communications almost exclusively to date. However, the conventional LLL algorithm has variable reduction time, and hence non-constant throughput for the resulting communications system. In order to...
In this paper, the authors propose a confidence- based joint orthogonal coding and modulation algorithm for soft information cooperation in the time-division broadcast bi-directional relaying networks. We first compute the log-likelihood ratio (LLR) of the received signals at relay nodes in the first two time slots, then derive the probability distribution of the scaled LLR. Inspired by the space-time...
In this paper, we propose the soft information cooperation scheme in the bi-directional wireless relay networks.We first compute the Log-Likelihood ratio (LLR), referred to as the soft information of relay received signal in Rayleigh fading channel, and then propose an efficient LLR-based network coding scheme. Moreover, for computational simplicity, we optimize the soft information cooperation by the...
This paper proposes a new mechanism based on the combination of rotation method and water-marking technology to fulfill the digital-image-bill authentication. The watermarking method we adopted is an modified block-based schemes for DCT-domain. Additionally, to make the watermark vulnerable for geometrical attacks, such as cropping, cutting, compression and rotation, we embedded our data with intra-block...
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