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2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)最新文献

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A wideband real-time spectrometer based on combined complex FFT for radio astronomy 基于复合FFT的射电天文学宽带实时光谱仪
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923914
Xianhai Wang, Q. Meng, Han Jinlin, Wang Chen, Jianwei Zhang
{"title":"A wideband real-time spectrometer based on combined complex FFT for radio astronomy","authors":"Xianhai Wang, Q. Meng, Han Jinlin, Wang Chen, Jianwei Zhang","doi":"10.1109/CSNDSP.2014.6923914","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923914","url":null,"abstract":"We developed a 1.2 GHz bandwidth spectrometer based on combined complex FFT algorithm for radio astronomy. It resolves the contradiction between wide bandwidth and high speed real-time processing by using the combined complex FFT algorithm. Block-RAMs(BRAMs) in FPGA are saved by parallel processing and module multiplexing, while the computation time also decreases significantly due to symmetry properties of intermediate variables in data processing. Observations at Shanghai Astronomical Observatory for pulsars with the developed spectrometer show that the system works well and meets the requirements of the observation.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133230906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Hysteresis properties induced by variable polarization angle in the polarization switching of VCSELs 变极化角诱导的vcsel偏振开关迟滞特性
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923848
S. Nazhan, Zabih Ghassemlooy, K. Busawon, Joaquin Perez
{"title":"Hysteresis properties induced by variable polarization angle in the polarization switching of VCSELs","authors":"S. Nazhan, Zabih Ghassemlooy, K. Busawon, Joaquin Perez","doi":"10.1109/CSNDSP.2014.6923848","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923848","url":null,"abstract":"The influence of variable-polarization optical feedback (VPOF) on the polarization mode switching (PMS) properties of a vertical-cavity surface-emitting laser (VCSEL) has been investigated experimentally. Rotated-polarization optical feedback is considered. At high levels of optical feedback VCSEL exhibits an abrupt PMS when the polarization angle is swept from 0° to 90° and vice versa. We observe a hysteresis loop (HL) beyond the polarization angle of 45°, which is barely affected by the level of feedback. The experimental results demonstrate that the size of HL strongly depends on the feedback level, where a narrower and wider width HL are observed at higher and lower levels of feedback, respectively. An external optical feedback with the VPOF can significantly alter the bistability properties of PMS in VCSELs. VPOF can provide a new method to obtain the controllable bistable PMS in VCSELs, which is extremely useful for applications that use the optical bistability (OB).","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"687 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113986400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Fibre impairment compensation using artificial neural network equalizer for high-capacity coherent optical OFDM signals 基于人工神经网络均衡器的高容量相干光OFDM信号光纤损伤补偿
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923996
M. Jarajreh, S. Rajbhandari, E. Giacoumidis, N. Doran, Zabih Ghassemlooy
{"title":"Fibre impairment compensation using artificial neural network equalizer for high-capacity coherent optical OFDM signals","authors":"M. Jarajreh, S. Rajbhandari, E. Giacoumidis, N. Doran, Zabih Ghassemlooy","doi":"10.1109/CSNDSP.2014.6923996","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923996","url":null,"abstract":"We propose an artificial neural network (ANN) equalizer for transmission performance enhancement of coherent optical OFDM (C-OOFDM) signals. The ANN equalizer showed more efficiency in combating both chromatic dispersion (CD) and single-mode fibre (SMF)-induced non-linearities compared to the least mean square (LMS). The equalizer can offer a 1.5 dB improvement in optical signal-to-noise ratio (OSNR) compared to LMS algorithm for 40 Gbit/s C-OOFDM signals when considering only CD. It is also revealed that ANN can double the transmission distance up to 320 km of SMF compared to the case of LMS, providing a nonlinearity tolerance improvement of ~0.7 dB OSNR.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115058091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
SAR multiple targets imaging using UWB OFDM signals 利用UWB OFDM信号进行SAR多目标成像
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923878
M. Buhari, A. Muqaibel
{"title":"SAR multiple targets imaging using UWB OFDM signals","authors":"M. Buhari, A. Muqaibel","doi":"10.1109/CSNDSP.2014.6923878","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923878","url":null,"abstract":"This paper investigates the use of Ultra Wideband (UWB) Orthogonal Frequency Division Multiplexing (OFDM) in Synthetic Aperture Radar (SAR) imaging for multiple targets. The system geometry is presented with the necessary conditions for multiple target resolvability. These conditions are specified by the cross-range and range resolutions. If any of these conditions is satisfied, the receiver can distinguish the different target positions otherwise it will image them as one single large target. In the simulation results, two targets are used to show the capability of this approach in resolving multiple targets images which are formed by combining the Range Profile Reconstruction (RPR) with the corresponding Cross-range Profile Reconstruction (CPR) value.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115051621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
A 40GS/s low-power BiCMOS comparator for ultra-high speed ADC 用于超高速ADC的40GS/s低功耗BiCMOS比较器
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923963
H. WenWei, Meng Qiao
{"title":"A 40GS/s low-power BiCMOS comparator for ultra-high speed ADC","authors":"H. WenWei, Meng Qiao","doi":"10.1109/CSNDSP.2014.6923963","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923963","url":null,"abstract":"This paper presents a 40GS/s low-power Bipolar Complementary Metal-Oxide Semiconductor (BiCMOS) latched comparator for analog to digital converter (ADC). In this design, to achieve a low-power consumption and higher bandwidth, an active inductor load comprised by a BiCMOS transistor and a resister comparator is adopted in the circuit. Operating at Nyquist, the comparator can sample up to 40GS/s with an input sensitivity of less than 10 mV. The comparator is fabricated in 0.18μm SiGe BiCMOS technology with a chip area of 80×67 μm2. The total power consumption is approximately 28 mW from a 3.3V power supply. The proposed comparator can be applied to ultra-high-speed and low-power ADC.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128670391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A cache-aware routing scheme for information-centric networks 一种用于信息中心网络的缓存感知路由方案
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923921
V. Vassilakis, M. Al-Naday, M. Reed, B. Alzahrani, Kun Yang, I. Moscholios, M. Logothetis
{"title":"A cache-aware routing scheme for information-centric networks","authors":"V. Vassilakis, M. Al-Naday, M. Reed, B. Alzahrani, Kun Yang, I. Moscholios, M. Logothetis","doi":"10.1109/CSNDSP.2014.6923921","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923921","url":null,"abstract":"In recent years, the information-centric networking (ICN) concept has been attracting increasing attention of the research community. The aim is to overcome intrinsic inefficiencies of the existing host-to-host communication paradigm, as well as to provide new and enhanced services to mobile and fixed users. A key feature of ICN is the support for in-network content caching. In this paper, we present a new cache-aware routing scheme for ICN. Our scheme takes into account the information about the locations of caches in the network and constructs delivery paths for efficient content dissemination. The proposed approach does not impose additional signaling overhead in the network; while at the same time it is agnostic of the cached contents. The performance of the proposed scheme is verified by simulation studies, which show an up to 50% delay reduction compared to traditional routing approaches.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134517380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Concatenated LDPC-TCM coding for reliable storage in multi-level flash memories 级联LDPC-TCM编码在多级快闪存储器中的可靠存储
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923818
Quan Xu, Pu Gong, Thomas M. Chen
{"title":"Concatenated LDPC-TCM coding for reliable storage in multi-level flash memories","authors":"Quan Xu, Pu Gong, Thomas M. Chen","doi":"10.1109/CSNDSP.2014.6923818","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923818","url":null,"abstract":"In this paper, we present an efficient fault tolerant solution for multi-level per cell (MLC) flash memory that concatenates trellis coded modulation (TCM) with an outer low-density parity-check (LDPC) code. Traditional flash coding systems employ simple hard-decisions based codes, such as Bose-Chaudhuri-Hocquenghem (BCH) codes, that can correct a fixed, specified number of errors. Thanks to the Bahl, Cocke, Jelinek, and Raviv (BCJR) algorithm, the TCM decoder within the proposed design can provide soft decisions which make it possible to use the more powerful LDPC codes. Moreover, the error-correction performance is further improved since TCM can decrease the raw error rate of MLC and hence relieve the burden of outer LDPC code. The effectiveness of concatenated LDPC-TCM systems has been successfully demonstrated through computer simulations.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116543758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Dynamic write-level and read-level signal design for MLC NAND flash memory MLC NAND闪存的动态写级和读级信号设计
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923850
Chaudhry Adnan Aslam, Y. Guan, K. Cai
{"title":"Dynamic write-level and read-level signal design for MLC NAND flash memory","authors":"Chaudhry Adnan Aslam, Y. Guan, K. Cai","doi":"10.1109/CSNDSP.2014.6923850","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923850","url":null,"abstract":"In this paper, we propose dynamic write-level and read-level voltage scheme for MLC NAND flash memory. We study the characteristics of flash channel which can be modeled as mixture of Uniform and Exponential distribution. Since this channel shows non-stationary behavior, we present probability of error analysis and introduce the concept of dynamically adjusting the verify-level (write-level) and quantization-level (read-level) voltage values over varying flash channel. The proposed dynamic voltage based method outperforms fixed verify-level voltage scheme. We demonstrate improvements in bit-error-rate (BER) performance and cell storage capacity for the proposed signal design scheme.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116635997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
A new Mobility, Energy and Congestion Aware Routing scheme for MANETs 一种新的机动、能源和拥塞感知路由方案
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923931
Tran The Son, H. L. Minh, G. Sexton, N. Aslam, R. Boubezari
{"title":"A new Mobility, Energy and Congestion Aware Routing scheme for MANETs","authors":"Tran The Son, H. L. Minh, G. Sexton, N. Aslam, R. Boubezari","doi":"10.1109/CSNDSP.2014.6923931","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923931","url":null,"abstract":"Mobility, energy limits and traffic congestion are the main reasons for a poor routing performance in MANETs. Inspired by those challenges, this paper proposes a new routing scheme named Mobility, Energy and Congestion Aware Routing (MECAR) to improve routing performance for MANETs. In this model, a node monitors the mobility, energy consumption and traffic congestion based on a multi-metric named AEC (constructed by Average Encounter Rate, Energy Consumption Rate, and Congestion Factor) to choose the most stable, power-rich and congestion-free path for routing. As a result, packet delivery ratio of the proposed model improves almost 20% compared to that of original AODV protocol while the number of dead nodes and routing overheads decreases significantly.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125895266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Equalization of negative-exponential fading in saturated semiconductor optical amplifiers 饱和半导体光放大器中负指数衰落的均衡
2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP) Pub Date : 2014-07-23 DOI: 10.1109/CSNDSP.2014.6923955
K. Yiannopoulos, N. Sagias, A. Boucouvalas
{"title":"Equalization of negative-exponential fading in saturated semiconductor optical amplifiers","authors":"K. Yiannopoulos, N. Sagias, A. Boucouvalas","doi":"10.1109/CSNDSP.2014.6923955","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923955","url":null,"abstract":"In this paper, we discuss the mitigation of negative-exponential fading in Optical Wireless Communication (OWC) systems. The mitigation technique involves the utilization of a semiconductor optical amplifier (SOA) whose gain saturates in normal link operation, but which also provides a power-dependent varying gain when the link experiences a fade. The unbalanced SOA operation serves towards the equalization of the signal power at its output and as a result the link fades become less severe and of reduced duration. Our analytical results predict that the fade probability can be reduced by over 90% under negative-exponential fading conditions, while the scintillation index at the SOA output is also reduced by 75% if an optimal level of received power, and therefore gain saturation, is observed. Finally, our results show that the average duration of fades can also be reduced by a significant percentage of 68% for the same level of gain saturation in the SOA.","PeriodicalId":199393,"journal":{"name":"2014 9th International Symposium on Communication Systems, Networks & Digital Sign (CSNDSP)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127350543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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