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  • Open Access


    An Optimized Algorithm for CR-MIMO Wireless Networks

    Imran Khan1, Fahd N. Al-Wesabi2, Marwa Obayya3, Anwer Mustafa Hilal4, Manar Ahmed Hamza4, Mohammed Rizwanullah4, Fahad Ahmed Al-Zahrani5, Hirofumi Amano6, Samih M. Mostafa7,*

    CMC-Computers, Materials & Continua, Vol.71, No.1, pp. 697-715, 2022, DOI:10.32604/cmc.2022.021847

    Abstract With the rapid development of wireless communication technology, the spectrum resources are increasingly strained which needs optimal solutions. Cognitive radio (CR) is one of the key technologies to solve this problem. Spectrum sensing not only includes the precise detection of the communication signal of the primary user (PU), but also the precise identification of its modulation type, which can then determine the a priori information such as the PU’ service category, so as to use this information to make the cognitive user (CU) aware to discover and use the idle spectrum more effectively, and improve the spectrum utilization. Spectrum sensing… More >

  • Open Access


    Uplink SCMA Codebook Reuse Transmission and Reception Scheme

    Xiaohong Ji1, Junjun Du1, Guoqing Jia1,*, Weidong Fang2,3

    Intelligent Automation & Soft Computing, Vol.27, No.1, pp. 221-231, 2021, DOI:10.32604/iasc.2021.013145

    Abstract Sparse code multiple access (SCMA) is a new non-orthogonal multiple access scheme suitable for 5G communication, which can effectively improve spectrum efficiency and support massive connections. Multiple users in the SCMA system realize the sharing of the same time-frequency resources by mapping data into codewords of a special code book (Code Book, CB). A typical SCMA system increases the spectrum utilization to 150%. In order to further improve the system spectrum utilization and increase the number of user connections, this paper proposes an uplink SCMA codebook reuse transmission and reception scheme (CB-Reuse-SCMA), which reuse a codebook to multiple users. The… More >

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