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Fractional Fourier Transform Based M-ary Chirp Modulation
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作者 SHA Jiajun ZHENG Guoxin YANG Lin 《Journal of Shanghai Jiaotong university(Science)》 EI 2020年第6期795-801,共7页
In this paper,a novel M-ary chirp modulation scheme is proposed on the basis of the energy concen-tration property of chirp signals in fractional domain.In the proposed scheme,chirp signals with diferent phases are mu... In this paper,a novel M-ary chirp modulation scheme is proposed on the basis of the energy concen-tration property of chirp signals in fractional domain.In the proposed scheme,chirp signals with diferent phases are multiplexed in the same time frequency bandwidth through reverse chirp rate to increase information rate.In addition,fractional filters based on fractional Fourier transform(FRFT)are designed to separate chirp signals of diferent chirp-rates in the receiver.Moreover,the theoretical performance of fractional filters and the error probability of M-ary chirp system are derived.Both theoretical analysis and simulation prove that the proposed scheme outperforms M-ary quadrature amplitude modulation(QAM)system in the anti-noise performance. 展开更多
关键词 chirp modulation fractional Fourier transform(FRFT)filter M-ary chirp
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Time-Frequency Bandwidth Product Estimation of Sinusoidal Non-Linear Chirp Keying Scheme 被引量:1
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作者 Zhiguo Sun Xiaoyan Ning Danyang Tian 《China Communications》 SCIE CSCD 2017年第8期184-194,共11页
Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some par... Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some parameter estimation issues over conventional modulation schemes. In this paper, a novel transform termed as Discrete Sinusoidal Frequency Modulation transform(DSFMT) is proposed. Then, the DSFMT of SNCK signal is deduced and classified into three types, based on which, the time-bandwidth product is estimated by the proposed algorithm. Simulation results show that the noise has a signifi cant impact on the localization of the peak value and the time-bandwidth product can be estimated by using local ratio values when. 展开更多
关键词 parameter estimation time-bandwidth product sine non-linear chirp keying(SNCK) discrete sinusoidal frequency modulation transform(DSFMT)
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Chirp control of femtosecond laser-filamentation-induced snow formation in a cloud chamber 被引量:3
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作者 梁鸿 孙海轶 +4 位作者 刘永宏 田野 鞠晶晶 王成 刘建胜 《Chinese Optics Letters》 SCIE EI CAS CSCD 2015年第3期85-88,共4页
Filamentation-induced water condensation and snow formation are investigated using laser pulses with different chirps and pulse widths. Chirped pulses result in the laser filamentation with different spatial lengths a... Filamentation-induced water condensation and snow formation are investigated using laser pulses with different chirps and pulse widths. Chirped pulses result in the laser filamentation with different spatial lengths and intensities, which has a great impact on airflow motion and snow formation. The experiments show that snow formation mainly relates to the filament intensity distribution. Negative chirped pulses produce a greater amount of snow because of higher intensity inside the filaments as compared with the positive chirped pulses. 展开更多
关键词 chirp modulation Laser beams
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Sound Modulation in Singing Katydids Using Ionic Polymer-Metal Composites (IPMCs)
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作者 Yan Zhou Cheng-Wei Chiu +5 位作者 Carlos J. Sanchez Jorge M. Gonzalez Benjamin Epstein David Rhodes S. Bradleigh Vinson Hong Liang 《Journal of Bionic Engineering》 SCIE EI CSCD 2013年第4期464-468,共5页
Many insect families have evolved to produce and detect complex singing patterns for the purposes of mating, display of dominance, predator escape, and other needs. While the mechanisms of sound production by insects ... Many insect families have evolved to produce and detect complex singing patterns for the purposes of mating, display of dominance, predator escape, and other needs. While the mechanisms of sound production by insects have been thoroughly studied, man-machine exploitation of such mechanisms has remained unreported. We therefore describe a method to modulate the frequency spectrum in the chirp call of a singing insect, Gampsocleis gratiosa (Orthoptera: Tettigoniidae), a large katydid indigenous to China and commonly known as Guo Guo or Chinese Bush Cricket. The chirp modulation was achieved through the contact of a ribbon of lonic Polymer-Metal Composite (IPMC) against wing of the insect. The IPMC effectively served as an actuator when a small DC voltage was applied to the ribbon's faces. By applying a sequential on/off voltage waveform to the IPMC ribbon, the katydid's chirp was modulated in a corresponding manner. This configuration can be used as part of a broader application of using singing insects to harness their acoustic power to produce and propagate machine-induced messages into the acoustic environment. 展开更多
关键词 chirp modulation KATYDID IPMC
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The design of electroabsorption modulators with negative chirp and very low insertion loss 被引量:1
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作者 Kambiz Abedi 《Journal of Semiconductors》 EI CAS CSCD 2012年第6期14-19,共6页
Electroabsorption modulators(EAMs) with negative chirp and very low insertion loss are numerically designed with asymmetric intra-step-barrier coupled double strained quantum wells(AICD-SQWs) based on InGaAlAs mat... Electroabsorption modulators(EAMs) with negative chirp and very low insertion loss are numerically designed with asymmetric intra-step-barrier coupled double strained quantum wells(AICD-SQWs) based on InGaAlAs material.For this purpose,the electroabsorption coefficient is calculated over a range of wells layer strain from compressive(CS) to tensile(TS).The chirp parameter and insertion loss for TE input light polarization are evaluated from the calculated electroabsorption spectra,and their Kramers-Kronig transformed refractive index changes.The results of the numerical simulation show that the best range of left and right wells strain for EAMs based on AICD-SQWs with negative chirp and very low insertion loss are from 0.032%to 0.05%(TS) and-0.52% to-0.50%(CS),respectively. 展开更多
关键词 electroabsorption modulators AICD-SQW strain chirp insertion loss
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Development of an all-fiber heterodyne lidar for range and velocity measurements 被引量:4
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作者 杨馥 贺岩 +1 位作者 尚建华 陈卫标 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第7期713-716,共4页
A 1550-nm all-fiber monostatic lidar system based on linear chirp amplitude modulation and heterodyne detection for the measurements of range and velocity is presented. The signal processing method is given, after whi... A 1550-nm all-fiber monostatic lidar system based on linear chirp amplitude modulation and heterodyne detection for the measurements of range and velocity is presented. The signal processing method is given, after which the relationship between the peak frequency values in the final signal spectrum, the target's range, and the line-of-sight velocity is obtained in the presence of the fiber end-face-reflected signal plaguing many monostatic lidar systems. The range of an electric fan as well as the line-of-sight fan speed of different levels is tested. This proposed system has a potential application for the space-borne landing system. 展开更多
关键词 chirp modulation HETERODYNING Optical radar Velocity measurement
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High contrast amplification at 1053 nm limited by pulse stretching-compressing process
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作者 陆效明 彭宇杰 +5 位作者 李妍妍 郭晓杨 冷雨欣 隋展 许毅 王新亮 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第2期88-92,共5页
We report on our high-contrast laser based on high-contrast, high-energy seed injection, low-gain optical para- metric chirped pulse amplification (OPCPA), and Nd:glass amplifiers, which can be used as the high-con... We report on our high-contrast laser based on high-contrast, high-energy seed injection, low-gain optical para- metric chirped pulse amplification (OPCPA), and Nd:glass amplifiers, which can be used as the high-contrast front end of a high-power Nd:glass chirped pulse amplification (CPA) laser system. The energy of the stretched 1053 nm high-contrast seed pulse increases to 60 DJ by optimizing the frequency doubling crystal in the pulse cleaning device. After passing through a two-stage low-gain OPCPA, a 2-pass 2-rod Nd:glass amplifier, and a compressor the amplified pulse of 131 mJ/282 fs is achieved. The third-order correlation scanning measurement shows that the pulse contrast in the tens of ps range is about 10^-7-10^-8. With the high-contrast seed passing through the stretcher and compressor only, the contrast measurement indicates that the stretching-compressing process leads mainly to the contrast degradation of the amplified pulse. 展开更多
关键词 AMPLIFICATION chirp modulation Frequency doublers GLASS Laser optics Ultrashort pulses
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