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Underwater Acoustic Communication Based on Pattern Time Delay Shift Coding Scheme 被引量:9
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作者 殷敬伟 惠俊英 +2 位作者 惠娟 姚直象 王逸林 《China Ocean Engineering》 SCIE EI 2006年第3期499-508,共10页
Underwater acoustic communication based on Pattern Tune Delay Shift Coding (PDS) communication scheme is studied. The time delay shift values of the pattern are used to encode the digital information in the PDS sche... Underwater acoustic communication based on Pattern Tune Delay Shift Coding (PDS) communication scheme is studied. The time delay shift values of the pattern are used to encode the digital information in the PDS scheme, which belongs to the Pulse Position Modulation (PPM). The duty cycle of the PDS scheme is small, so it can economize the power for communication. By use of different patterns for code division and different frequencies for channel division, the communication system is capable of mitigating the inter-symbol interference (ISI) caused by the muhipath channel. The data rate of communication is 1000 bits/s at 8 kHz bandwidth. The receiver separates the channels by means of bandpass filters, and performs decoding by 4 copy-correlators to estimate the time delay shift value. Based on the theoretical analysis and numerical simulations, the PDS scheme is shown to be a robust and effective approach for underwater acoustic communication. 展开更多
关键词 underwater acoustic UWA conmumwation pattern time delay shift coding (PDS) estimation of time delay shift nudtipath channel inter-symbol inteoCerence (ISI)
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Study on pattern time delay shift coding scheme 被引量:1
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作者 YIN Jing-wei HUI Jun-ying +1 位作者 WANG Yi-lin YAO Zhi-xiang 《Journal of Marine Science and Application》 2006年第3期51-56,共6页
Pattern Time Delay Shift Coding (PDS) scheme is robust for underwater acoustic communication. The digital information are encoded in the time delay shift values of the Pattern, so the PDS scheme belongs to the Pulse P... Pattern Time Delay Shift Coding (PDS) scheme is robust for underwater acoustic communication. The digital information are encoded in the time delay shift values of the Pattern, so the PDS scheme belongs to the Pulse Position Modulation (PPM). Several Patterns are selected for code division that the communication system could have a high ability to mitigate the inter-symbol interference (ISI) caused by multipath channel. Four communication channels work on the same time divided by different frequency, which lead to 1000bits/s of the data rate of communication. The simulation experiments show that the PDS system could adapt to many underwater acoustic channels for high data rate and high reliability. 展开更多
关键词 pattern time delay shift coding underwater acoustic communication inter-symbol interference (ISI)
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Efficient measurement and optical proximity correction modeling to catch lithography pattern shift issues of arbitrarily distributed hole layer
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作者 Yaobin FENG Jiamin LIU +2 位作者 Zhiyang SONG Hao JIANG Shiyuan LIU 《Frontiers of Mechanical Engineering》 SCIE CSCD 2024年第4期45-54,共10页
With the continued shrinking of the critical dimensions(CDs)of wafer patterning,the requirements for modeling precision in optical proximity correction(OPC)increase accordingly.This requirement extends beyond CD contr... With the continued shrinking of the critical dimensions(CDs)of wafer patterning,the requirements for modeling precision in optical proximity correction(OPC)increase accordingly.This requirement extends beyond CD controlling accuracy to include pattern alignment accuracy because misalignment can lead to considerable overlay and metal-via coverage issues at advanced nodes,affecting process window and yield.This paper proposes an efficient OPC modeling approach that prioritizes pattern-shift-related elements to tackle the issue accurately.Our method integrates careful measurement selection,the implementation of pattern-shift-aware structures in design,and the manipulation of the cost function during model tuning to establish a robust model.Confirmatory experiments are performed on a via layer fabricated using a negative tone development.Results demonstrate that pattern shifts can be constrained within a range of+1 nm,remarkably better than the original range of±3 nm.Furthermore,simulations reveal notable differences between post OPC and original masks when considering pattern shifts at locations sensitive to this phenomenon.Experimental validation confirms the accuracy of the proposed modeling approach,and a firm consistency is observed between the simulation results and experimental data obtained from actual design structures. 展开更多
关键词 computational lithography optical proximity correction MODELING pattern shift metrology
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Desktop calibration of automatic transmission for passenger vehicle 被引量:1
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作者 FANG Chi SHI Jian-peng 王军 《Journal of Chongqing University》 CAS 2014年第1期26-32,共7页
Desktop calibration of automatic transmission(AT) is a method which can reduce cost, enhance efficiency and shorten the development periods of a vehicle effectively. We primary introduced the principle and approach of... Desktop calibration of automatic transmission(AT) is a method which can reduce cost, enhance efficiency and shorten the development periods of a vehicle effectively. We primary introduced the principle and approach of desktop calibration of AT based on the condition of coupling characteristics between engine and torque converter and obtained right point exactly. It is shown to agree with experimental measurements reasonably well. It was used in different applications abroad based on AT technology and achieved a good performance of the vehicle compared with traditional AT technology which primary focuses on the drivability, performance and fuel consumption. 展开更多
关键词 automatic transmission desktop calibration shift pattern DRIVABILITY fuel consumption
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Parametric array differential Pattern time delay shift coding underwater acoustic communication in the under-ice environment 被引量:1
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作者 YIN Jingwei ZHANG Xiao +2 位作者 ZHU Guangping TANG Shengyu SUN Hui 《Chinese Journal of Acoustics》 CSCD 2016年第4期431-439,共9页
In order to meet the demands of underwater acoustic communication in under ice environment,a differential Pattern time delay shift coding underwater acoustic communication method based on parametric array is introduce... In order to meet the demands of underwater acoustic communication in under ice environment,a differential Pattern time delay shift coding underwater acoustic communication method based on parametric array is introduced in this paper.The under ice underwater acoustic channel is characterized by heavy multipath transmission.Under this model,a parametric array emission method of Pattern signal is derived and the system performance is analyzed.A broadband low frequency sound waves with narrow beam-pattern,which will reduce the interface reflections and suppress the effects of multipath transmission,can be obtained by the emission method.The Songhua River under ice trial results show that there is an anti-multipath property and a higher data rate in the under-ice acoustic channel in proposed approach. 展开更多
关键词 TIME LFM Parametric array differential pattern time delay shift coding underwater acoustic communication in the under-ice environment
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A study on pattern time delay shift coding underwater acoustic communication
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作者 HUI Junying LIU li +1 位作者 FENG Haihong LIU hong(Underwater Acoustics Institute, Harbin Engineering University Harbin 150001) 《Chinese Journal of Acoustics》 1999年第2期105-120,共16页
The high rate digital acoustic communication technique for horizontal channels has been studied in this article. It is called as 'Pattern Time Delay Shift Coding (PDS) communication system.' The aim of the PDS... The high rate digital acoustic communication technique for horizontal channels has been studied in this article. It is called as 'Pattern Time Delay Shift Coding (PDS) communication system.' The aim of the PDS is to improve the quality of communication in shallow water. The open water experiments shoe that at the condition of 2 kHz bandwidth, the communication rate is more than 300 bit/s and error rate is at the level of 10-4. The details of PDS technique will be shown, including: principle of PDS coding, the model of Anti-multipath illterference and open water experimenis 展开更多
关键词 IEEE TIME A study on pattern time delay shift coding underwater acoustic communication
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