Results 1 to 10 of about 434,022 (280)
Development and application of hobbing-cone hybrid PDC bit
Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2023 In order to solve the problems of low ROP and short service life of the bit drilling in deep and hard formation, a new technology of hobbing-cone hybrid PDC bit which has combined the advantages of conventional PDC bit and the hobbing-cone is proposed in
Lian Chen +7 more
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Advances in Mechanical Engineering, 2019 On the basis of structural features and working principle of polycrystalline diamond compact–roller hybrid drill bit, a detachable experiment device with adjustable structural parameters are designed and manufactured for the hybrid bit, and accordingly ...
Shi-wei Niu +6 more
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Bit-interleaved coded modulation for hybrid RF/FSO systems [PDF]
IEEE Transactions on Communications, 2009 In this paper, we propose a novel architecture for hybrid radio frequency (RF)/free-space optics (FSO) wireless systems. In particular, we show that a hybrid system robust to all weather conditions is obtained by joint bit-interleaved coded modulation (BICM) of the bit steams transmitted over the RF and FSO sub-channels.
Robert Schober
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Working characteristics research on the impacting–cutting hybrid bit
Advances in Mechanical Engineering, 2019 In order to improve the drilling efficiency of bit drilling in poor-drillability formation, the authors of this article put forward a cutting–percussion hybrid bit, the fixed-cutting units and impact-crushing units of which are mutually independent and ...
Kuilin Huang, Zhijiu Ai, Yingxin Yang
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Optimal Bit Allocation-Based Hybrid Precoder-Combiner Design Techniques for mmWave MIMO-OFDM Systems
IEEE Access, 2021 This work conceives techniques for the design of hybrid precoders/combiners for optimal bit allocation in frequency selective millimeter wave (mmWave) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems, toward
Manjeer Majumder +3 more
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Symbol and Bit Error Rates Analysis of Hybrid PIM-CDMA [PDF]
EURASIP Journal on Wireless Communications and Networking, 2005 A hybrid pulse interval modulation code-division multiple-access (hPIM-CDMA) scheme employing the strict optical orthogonal code (SOCC) with unity and auto- and cross-correlation constraints for indoor optical wireless communications is proposed. In this
Ghassemlooy Z., See C. K.
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Sensors, 2022 This paper proposes an effective strongest angles of arrival (AoAs) estimation algorithm for a hybrid millimeter wave (mmWave) communication system with 1-bit analog-to-digital/digital-to-analog converters (A/Ds) equipped at transceivers.
Ruihan Li +3 more
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Linearized 9-Bit Hybrid LBDD PWM Modulator for Digital Class-BD Amplifier [PDF]
International Journal of Electronics and Telecommunications, 2021 The paper presents an original architecture and implementation of 9-bit Linearized Pulse Width Modulator (LPWM) for Class-BD amplifier, based on the hybrid method using STM32 microcontroller and Programmable Tapped Delay Line (PTDL).
Wojciech Kołodziejski +1 more
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Hybrid Bit-to-Symbol Mapping for Spatial Modulation [PDF]
IEEE Transactions on Vehicular Technology, 2016 In spatial modulation (SM), the information bit stream is divided into two different sets: the transmit antenna index bits (TA-bits) and the amplitude and phase modulation bits (APM-bits). However, the conventional bit-to-symbol mapping (BTS-MAP) scheme maps the APM-bits and the TA-bits independently.
Ping Yang 0005 +5 more
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FPGA Accelerator Design for Hybrid Precision Frequency Domain Convolutional Neural Network [PDF]
Jisuanji gongcheng, 2023 Deep Convolutional Neural Network(CNN) have large models and high computational complexity, making their deployment in Programmable Gate Array(FPGA) with limited hardware resources difficult.
Yi CHEN, Bosheng LIU, Yongqi XU, Jigang WU
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