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  1. 42961

    A genetic algorithm based method of optimizing dispersion matrix for RDSM system by Peng ZHANG, Xiaoping JIN, Dongxiao CHEN

    Published 2022-12-01
    “…Rectangular differential spatial modulation (RDSM) is a multi-antenna incoherent modulation technology with high spectral efficiency, low power consumption, and zero-overhead for channel estimation.RDSM is especially suitable for 6G communication systems, such as fast-moving Internet of vehicles, Internet of things, cellular networks, etc.However, the construction of the sparse rectangular unitary space-time dispersion matrix (DM) at transmitter is a problem.The proposed Genetic algorithm (GA) will result in less computational complexity than the currently used random research.The fitness of GA was calculated by the rank and determinant criterion (RDC) method to avoid discussions in differential system.Due to characteristics of constellation symbols of RDSM, the proposed method reduced the computational complexity during each single iteration in GA.The simulation results show that the optimized DMS can significantly improve the bit error rate (BER) performance of the RDSM system.Compared with random search, the low-complexity GA effectively improves the DMS optimization efficiency of RDSM.The computational complexity required for optimizing DMS is about 0.1% of random search optimization method.…”
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  2. 42962
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  5. 42965

    Who Is Interested in Purchasing Smart Irrigation Systems? by Hayk Khachatryan, Alicia Rihn, Caroline Warwick, Michael Dukes

    Published 2019-09-01
    “…The adoption of smart irrigation technologies into residential landscapes, however, has been slow. …”
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  6. 42966
  7. 42967

    Sum-rate maximization in MIMO NOMA system with imperfect CSI by Yanjing SUN, Yang LIU, Jiasi ZHOU, Qi CAO, Song LI

    Published 2019-11-01
    “…In order to solve the problem of maximizing the sum rate under the constraints of transmission power limitation and users’ rates requirements,precoder and receiver were devised by combining multiple-input multiple-output (MIMO) and non-orthogonal multiple access (NOMA) based on imperfect channel state information (CSI).To take advantage of successive interference cancellation (SIC) techniques to eliminate interference from weak user’s signal,each data stream of the strong user needed to decode the corresponding weak user’s signal.Since the problem formed was non-convex,it was converted into the problem with the difference of two convex functions (D.C.) by using semi-positive definite programming and first-order Taylor expansion,and a penalty function was used to solve the constraint of the rank of the precoding covariance matrix.The simulation results show that compared with the orthogonal multiple access technology,the proposed D.C.algorithm can improve system sum rate.…”
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  8. 42968
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  12. 42972

    TECHNIQUES FOR FORMATION OF FERROELECTRIC PHOTONIC AND PHONONIC CRYSTALS by V. V. Krutov, A. S. Sigov, A. A. Shchuka

    Published 2017-04-01
    “…Researches in the field of technology of creation of ferroelectric photonic and phononic crystals are analyzed. …”
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  13. 42973
  14. 42974

    Management culture as part of the organizational culture in the formation and implementation of the organization's strategy by G. Zi

    Published 2021-06-01
    “…The article pays special attention to the discussion of information technologies as one of the elements of management culture, intensity and options for the development and implementation of modern technologies in business process management. …”
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  18. 42978

    Les mécanismes de sollicitation à la demande d'aide privilégiés par les étudiants du postsecondaire by Nicole Racette, Louise Sauvé, Normand Bourgault, Denise Berthiaume, Marie-Michèle Roy

    Published 2013-12-01
    “…College students demonstrated a significant preference for interpersonal (one on one) mechanisms while university students favored technology-based mechanisms (p < .05). Only 49,1 % of students who frequently encounter difficulties but do not have a learning disability access help, whereas 75,8 % of students with learning disabilities access help.…”
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  19. 42979

    Monitoring Stations for Surface Water Quality by Qingren Wang, Yuncong Li, Thomas Obreza, Rafael Munzo-Carpena

    Published 2004-12-01
    “… The traditional approach to water quality monitoring involves manually sampling water at remote sites and transporting it to a laboratory for chemical analysis. New technology and instrumentation have improved our ability to monitor water quality continuously regardless of weather and accessibility. …”
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  20. 42980