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    Improved Training Sequence Channel Estimation Scheme in 16QAM MB-OFDM UWBoF System by Changqing Xiang, Xi Yang, Xuan Zhou, Xiaojun Zhu, Jincan Xu, Qiong He

    Published 2020-01-01
    “…In this paper, an improved channel estimation scheme based on time-domain orthogonal gray complementary training sequence (Golay TS) is proposed to resist subcarrier mutual beat interference in 16-quadrature amplitude modulation multiband orthogonal-frequency-division-multiplexing ultrawide band over fiber (16QAM MB-OFDM UWBoF) systems. The simulation results showed that the performance of system with the improved Golay TS channel estimation scheme was improved by about 1 dB compared with the traditional Golay TS channel estimation scheme, at a bit error rate (BER) of 3.8 × 10−3 after 70 km standard single mode fiber (SSMF) transmission. …”
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  4. 364

    OCT-Precoding Combined with LDPC-Coding Scheme for 128 QAM MB-OFDM UWBoF System by Changqing Xiang, Xi Yang, Xiaojun Zhu, Qiong He, Renmin Zhang, Zhiyang Xiang

    Published 2020-01-01
    “…In this paper, we proposed a coding scheme based on orthogonal cyclic transpose (OCT) precoding combined with low-density parity check (LDPC) code to improve the transmission performance of 128-quadrature amplitude modulation multiband orthogonal-frequency-division-multiplexing ultrawide band over fiber (128 QAM MB-OFDM UWBoF) system. The proposed scheme could not only improve the performance of the system but also average the signal-to-noise ratio (SNR) of subcarriers and reduce the difference among subchannels in practical application. …”
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    Tekstil Sektöründe Önem Performans Analizi Uygulaması İle Üretime Dayalı Stratejik Öncelik Alanlarının Belirlenmesi by Lütfiye Seda Öztürk, Mevhibe Türkmen

    Published 2022-09-01
    “…Elde edilen sonuçlara göre firmanın düşük performans sergilenen ve dikkat etmesi gereken en önemli iki boyut olarak üretim ve lojistik boyutları tespit edilmiştir. …”
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    Метод прихованої передачі інформації в системах з Orthogonal frequency division multiplexing (OFDM) модуляцією by К.С. Васюта, У.Р. Збежховська, В.В. Слободянюк, В.С. Загривий, В.І. Чистов

    Published 2021-05-01
    Subjects: “…система передачі інформації, скритність, ofdm модуляція, псевдофазовий простір, bds статистика, iid-скритність.…”
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    Modeling and Performance Analysis of Energy Efficiency Binary Power Control in MIMO-OFDM Wireless Communication Systems by Yuming Wang, Xiaohu Ge, Chengqian Cao, Xi Huang, Frank Y. Li

    Published 2011-09-01
    “…The energy efficiency optimization of the binary power control scheme for MIMO-OFDM wireless communication systems is formulated, and then a global optimization solution of power allocation is derived. …”
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    Unilateral biportal endoscopic decompression combined with percutaneous pedicle screw fixation offers new treatment option for thoracolumbar burst fractures with secondary spinal stenosis by Guangchao Bai, Xiaowen Qiu, Guojun Wei, Xiaowei Jing, Qingfeng Hu

    Published 2025-01-01
    “…In Type A3 fractures, there is often a displacement of fracture fragments into the spinal canal, leading to secondary spinal stenosis. …”
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