Ngā hua rapu - Rahat Ullah

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  1. 1
    A Novel Concatenated Coded Modulation Based on GFDM for Access Optical Networks

    A Novel Concatenated Coded Modulation Based on GFDM for Access Optical Networks mā Feng Tian, Dong Guo, Bo Liu, Qi Zhang, Qinghua Tian, Rahat Ullah, Xiangjun Xin

    I whakaputaina 2018-01-01

    In this paper, we proposed a novel concatenated coded modulation composed of adaptive turbo code with trellis-coded modulation (ATTCM) that is based on generalized frequency division multiplex (GFDM) system. The proposed scheme has low complexity and provides high spectrum efficiency and significant...

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  2. 2
    1.12Tbps-16QAM Uncompensated Long-Haul Transmission Employing a New Self-Oscillating Optical Frequency Comb Generator Both at Transmitter and Receiver

    1.12Tbps-16QAM Uncompensated Long-Haul Transmission Employing a New Self-Oscillating Optical Frequency Comb Generator Both at Transmitter and Receiver mā Rahat Ullah, Sibghat Ullah, Shuaidong Chen, Ahmad Almadhor, Abdullah A. Al-Atawi, Ren Jianxin, Maqbool Khan, Giovanni Pau

    I whakaputaina 2024-01-01

    A new optoelectronic oscillator (OEO) is implemented for a novel self-sustained flat-topped self-oscillating optical frequency comb generator (SO-OFCG), which can be deployed in terahertz optical transmission. The OFCG is designed from a cascaded configuration of an electro-absorption modulator and...

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  3. 3
    High-Security Multi-Level Joint Encryption Scheme Based on SCMA Chaotic Codebook and OCDM Subcarrier Disturbance

    High-Security Multi-Level Joint Encryption Scheme Based on SCMA Chaotic Codebook and OCDM Subcarrier Disturbance mā Zhongwen Ding, Bo Liu, Jianxin Ren, Zeqian Guo, Shuyu Zhou, Xiangyu Wu, Yaya Mao, Shuaidong Chen, Rahat Ullah, Yongfeng Wu, Zhipeng Qi

    I whakaputaina 2023-01-01

    Sparse code multiplexing access (SCMA) is a new code-domain non-orthogonal technique in the fifth generation mobile communication (5G), which can improve the quality of single-user link by orthogonal chirp-chirp division multiplexing (OCDM) modulation. In this paper, a SCMA-OCDM multi-core fiber tra...

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