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In this letter, we present a design framework for fixed-point implementation of the log-domain message passing algorithm (Log-MPA) for sparse code multiple access signals, and make a detailed comparative analysis on the complexity of Log-MPA and traditional MPA. We also investigate the impact of the number of massage-passing iterations within the Log-MPA decoding process on the performance of Log-MPA...
In this paper, a new method for blind recognition of BCH code from an intercepted sequence of noise affected codewords is proposed. The proposed method recovers the parameters of a BCH code by finding the roots of it's generator polynomial. Firstly, the Galois Field Fourier Transform (GFFT) operation is carried out for each sequence of an estimated length. Then, find the positions of common zero spectral...
Transform domain communication system (TDCS) is a multi- carrier cognitive radio (CR) technique which uses cyclic code shift keying (CCSK) for overlay opportunistic spectrum access. Specifically, at any given time, a TDCS system cyclically shifts a fundamental modulation waveform (i.e., a CR sequence satisfying a dynamic spectrum hole constraint) according to specific input data symbol. In practical...
Aiming at the subjectivity and random problems existing in traditional evaluation and selection processes of supermarket fresh goods suppliers, and combined with the perishable and vulnerable characteristics and the current situation and development trend of supermarket fresh food, the paper constructed the ladder type evaluation framework by using SWOT analysis method, which is used to study the...
The prediction of online video session progress is useful for both optimizing and personalizing end-user experience. Our approach for online video recommendation is to use the session progress information instead of using a traditional rating system. We approach the prediction of session progress as a matrix completion problem, and complete the session progress matrix using noisy low-rank matrix completion...
Phase-Change-Memory (PCM) has emerged as a promising alternative of DRAM main memory. A new hybrid memory architecture, where DRAM serves as cache of PCM main memory, has been proposed to leverage PCM's high scalability and DRAM's fast access time. One biggest issue of PCM is the limited number of writes to storage cells. We argue that good cache mechanism will decrease PCM writes dramatically in...
It has been shown in the literature that network coding can improve the transmission efficiency of wireless broadcasting as compared to traditional ARQ schemes. In this paper, we propose an improved network coding scheme that can asymptotically achieve the theoretical lower bound on transmission overhead for a sufficiently large number of information blocks. The proposed scheme makes use of an index...
In this article, a novel dual codebook based multi-user multiple-input multiple-output (MU-MIMO) precoding and scheduling scheme with limited feedback for downlink transmission is proposed. The proposed dual codebook based MU-MIMO scheme utilizes the first codebook for limited feedback and the second codebook for scheduling and precoding for multiple users at the BS. This paper explores a simplified...
This paper explores the relationship between diversification and oil supply security risks, and quantifies the diversification index of Chinapsilas petroleum products import during 1994-2006, and analyzes the relationship between the Chinapsilas monthly petroleum products import prices and New York Harbor spot prices. Accordingly, we calculate the systematic and specific risk index of Chinapsilas...
In order to manage the increasing amount of RDF data, an RDF repository should provide not only necessary scalability and efficiency, but also sufficient inference capabilities. Though existing RDF repositories have made progress towards this goal, there is still ample space for improving the overall performance. In this paper, we propose a native RDF repository, System II, to pursue a better tradeoff...
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