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2007 International Symposium on Signals, Circuits and Systems最新文献

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Low-Complexity Turbo-Equalization and Iterative Channel Estimation for TDMA Packet Systems TDMA分组系统的低复杂度涡轮均衡与迭代信道估计
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292763
A. Paun, C. Silviu, C. Vladeanu
{"title":"Low-Complexity Turbo-Equalization and Iterative Channel Estimation for TDMA Packet Systems","authors":"A. Paun, C. Silviu, C. Vladeanu","doi":"10.1109/ISSCS.2007.4292763","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292763","url":null,"abstract":"In this paper, we present a low complexity iterative receiver for packet data transmission over time-varying frequency-selective fading channels. In the receiver, the minimum mean square error (MMSE) filter based equalizer and channel decoding are jointly optimized in an iterative process. Also, linear channel estimation is performed iteratively using a soft input recursive least squares algorithm with modified cost function. Simulation results for time-invariant and for both MAP and SOVA decoding are also presented.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127198227","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
An Investigation Of Spectral Properties Of PPM Signals Used In UWB Systems 超宽带系统中PPM信号的频谱特性研究
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292794
TudorN . Durnea
{"title":"An Investigation Of Spectral Properties Of PPM Signals Used In UWB Systems","authors":"TudorN . Durnea","doi":"10.1109/ISSCS.2007.4292794","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292794","url":null,"abstract":"The Ultra WideBand Pulse Position Modulation (UWB-PPM) systems are the most efficient implementations of the UWB systems based on impulses. They achieve a good quality of transmission by using a large bandwidth and small emitted energy. The deficiency of such systems is that they have a spectrum with energy concentrated at discrete points. These discrete frequency energy components generate interferences to narrowband systems operating in the same frequency interval, denying harmless coexistence. At the current date there is no complete formula for the power spectral density of the PPM signals which we could use to ascertain the size of this interference. We will present a method for the calculus of the PPM spectrum which will give an exact image of the signals' power spectral density.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125651563","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
FPGA Implementation of Gated Clock based Globally Asynchronous Locally Synchronous Wrapper Circuits 基于全局异步局部同步门控时钟封装电路的FPGA实现
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292699
E. Amini, M. Najibi, Z. Jeddi, H. Pedram
{"title":"FPGA Implementation of Gated Clock based Globally Asynchronous Locally Synchronous Wrapper Circuits","authors":"E. Amini, M. Najibi, Z. Jeddi, H. Pedram","doi":"10.1109/ISSCS.2007.4292699","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292699","url":null,"abstract":"This paper focuses on prototyping pausible and gated clock based GALS systems on commercial FPGAs. Pausible clock based GLAS systems use an on-chip clock generator to generate pausible clock pulses whereas gated clock based GALS systems use an off-chip clock signal that is gated whenever asynchronous data communication is required. These two design schemes have been examined on Viterbi error detection and correction circuit. While using on-chip pausible clocks in plausible GALS wrappers leads to a tradeoff between robustness and performance, it has been shown that both performance and robustness can be improved by using the gated clock scheme. In addition, the area overhead of gated clock based GALS Viterbi was less than the area overhead of pausible clock based GALS Viterbi.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130429190","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: 13
Delta-Sigma ADC for Ternary Code System (Part II: Decimation Filter Realization) 用于三元码制的Delta-Sigma ADC(第二部分:抽取滤波器的实现)
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292654
A. Korotkov, D. Morozov, A. Sinha
{"title":"Delta-Sigma ADC for Ternary Code System (Part II: Decimation Filter Realization)","authors":"A. Korotkov, D. Morozov, A. Sinha","doi":"10.1109/ISSCS.2007.4292654","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292654","url":null,"abstract":"This paper is sequential of [1]. Realization and simulation of a decimation FIR filter of an analog-to-digital converter for ternary code signal processing are presented. Description and simulation results of a ternary D flip-flop, a ternary full adder, and the FIR filter in a whole are given.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126792714","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
Analysis of the Trapezoidal Modulation for Current Source Inverters 电流源逆变器梯形调制分析
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292798
A. Şchiop, D. Trip
{"title":"Analysis of the Trapezoidal Modulation for Current Source Inverters","authors":"A. Şchiop, D. Trip","doi":"10.1109/ISSCS.2007.4292798","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292798","url":null,"abstract":"In this paper are derived, for the trapezoidal modulation, the formula of the n order harmonic current, and on the basis of these relations, depending on pulse number for a time period, it can be determined the optimal value for modulation index for cancellation or certain harmonics reduction.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"96 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126095372","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: 8
Efficiency of the Envelope Following Analyses 包络效率分析
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292776
A. Gheorghe, F. Constantinescu, M. Nitescu
{"title":"Efficiency of the Envelope Following Analyses","authors":"A. Gheorghe, F. Constantinescu, M. Nitescu","doi":"10.1109/ISSCS.2007.4292776","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292776","url":null,"abstract":"The poor efficiency of the envelope following analysis with respect to the transient analysis is pointed out. The implementations in SPECTRE RF and PAN are taken into account. The reasons for this poor efficiency are shown together with some possible solutions for its improvement.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115275541","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
Design of an Efficient Architecture for Enhancement of Stream Video Captured in Non-uniform Lighting Conditions 一种增强非均匀光照条件下捕获的流视频的高效架构设计
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292756
M.Z. Zhang, Ming-Jung Seow, Li Tao, V. Asari
{"title":"Design of an Efficient Architecture for Enhancement of Stream Video Captured in Non-uniform Lighting Conditions","authors":"M.Z. Zhang, Ming-Jung Seow, Li Tao, V. Asari","doi":"10.1109/ISSCS.2007.4292756","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292756","url":null,"abstract":"A novel architecture for performing hue-saturation-value (HSV) domain enhancement of digital color images with non-uniform lighting conditions is proposed in this paper for video streaming applications. The approach promotes log-domain computation to eliminate all multiplications, divisions and exponentiations utilizing the effective logarithmic estimation modules. An optimized quadrant symmetric architecture is incorporated into the design of homomorphic filter for the enhancement of intensity value. Efficient modules are also presented for conversion between RGB and HSV color spaces. The design is able to bring out details hidden in shadow regions of the image. It is capable of producing 187.86 million outputs per second (MOPs) on Xilinx's Virtex II XC2V2000-4ff896 field programmable gate array (FPGA) at a clock frequency of 187.86 MHz. It can process over 179.1 (1024 X 1024) frames per second and consumes approximately 70.7% and 76.8% less hardware resource with 127% and 280% performance boost when compared to the designs with machine learning algorithm [10], and with separated dynamic and contrast enhancements [11], respectively.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131375849","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
Electro Foot-Reflexology Stimulator 电足反射刺激器
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292738
F. Himmelstoss, G. Haas, M.F. Strummer, H. Votzi
{"title":"Electro Foot-Reflexology Stimulator","authors":"F. Himmelstoss, G. Haas, M.F. Strummer, H. Votzi","doi":"10.1109/ISSCS.2007.4292738","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292738","url":null,"abstract":"Foot reflexology is the practice of stimulating points on the feet to improve health. An electrical foot reflexology stimulator has been developed on the basics of foot reflexology massage and electroacupuncture. The device consists of a battery and a boost converter, the control-electronic and n electrodes. It is developed for the application of a changing current flow through the human body within the range of the foot reflex zones. Because of various control possibilities the proposed device is very flexible. A software controls the user parameters and offers an independent current control mode. This is very important for the user's safety. The possibility to change frequency, current or waveform in a wide range is a good argument for medically skilled and technically unskilled persons to use this device. This helps to establish new alternative medicine methods which have no or less interaction to other medicines.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131506943","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: 11
Wireless Localization using Time Difference of Arrival in Narrow-Band Multipath Systems 窄带多径系统中基于到达时差的无线定位
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292764
C. Comsa, Jianghong Luo, A. Haimovich, S. Schwartz
{"title":"Wireless Localization using Time Difference of Arrival in Narrow-Band Multipath Systems","authors":"C. Comsa, Jianghong Luo, A. Haimovich, S. Schwartz","doi":"10.1109/ISSCS.2007.4292764","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292764","url":null,"abstract":"The problem of estimating the location of a source is addressed based on the time difference of arrival (TDoA) of the first multipath component of the signal at different sensors with known locations. A maximum likelihood (ML) approach is adopted, followed by the presentation of some two-steps techniques. The TDoA estimation is carried out using a correlation technique and a super-resolution method - root multiple signal classification (MUSIC). The source is relatively narrowband and it operates over a wireless channel with a dense multipath environment following the COST-207 channel model. The performance of the source location techniques is evaluated in terms of the root mean square error (rMSE) of the transmitter's position for given placements of the sensors. A precision contour-map provides a graphic, two-dimensional representation of the source location accuracy as a function of the source location and the location of the sensors.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121758146","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: 26
Generating Chaotic Sequences for Enciphering Purposes 用于加密目的的混沌序列生成
2007 International Symposium on Signals, Circuits and Systems Pub Date : 2007-07-13 DOI: 10.1109/ISSCS.2007.4292767
A. Vlad, A. Luca
{"title":"Generating Chaotic Sequences for Enciphering Purposes","authors":"A. Vlad, A. Luca","doi":"10.1109/ISSCS.2007.4292767","DOIUrl":"https://doi.org/10.1109/ISSCS.2007.4292767","url":null,"abstract":"In a previous study we established how to provide discrete i.i.d. data sets starting from the logistic map. On the basis of this result, the present paper proposes simple and practical constructions for chaotic sequences useful for cryptographic purposes.","PeriodicalId":225101,"journal":{"name":"2007 International Symposium on Signals, Circuits and Systems","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134272080","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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