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2007 3rd International Workshop on Signal Design and Its Applications in Communications最新文献

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Comparative Analysis of Covertness in UWB Systems 超宽带系统中隐度的比较分析
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408395
Zhang Zhuo, Xing Lei, Yin Hao, Yu Quan
{"title":"Comparative Analysis of Covertness in UWB Systems","authors":"Zhang Zhuo, Xing Lei, Yin Hao, Yu Quan","doi":"10.1109/IWSDA.2007.4408395","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408395","url":null,"abstract":"IR (impulse radio)-ultra-wideband has a characteristic of low probability of detection (LPD) and can be used as a covertness technique for tactical military communication application. Using optimal time channelized radiometer for impulse radio detection, the covertness of IR-UWB systems affected by pulses per symbol, data rate, multiple users and modulation schemes are evaluated and compared to direct sequence spread spectrum (DSSS) systems.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123883433","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
A New Class of Binary Sequence Family with Low Correlation and Large Linear Complexity 一类新的低相关大线性复杂度二值序列族
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408414
Jin-Song Wang, Wen-feng Qi
{"title":"A New Class of Binary Sequence Family with Low Correlation and Large Linear Complexity","authors":"Jin-Song Wang, Wen-feng Qi","doi":"10.1109/IWSDA.2007.4408414","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408414","url":null,"abstract":"In this paper, we construct a class of (p(p + 2),p + 3,3p + 4) binary sequence family with low correlation and large linear complexity, where p and p + 2 are twin primes and p = 3 mod 4. This sequence family is generated by interleaving two Legendre sequences of period p and p+2, respectively. The balance properties of such family is evaluated, and for most cases the exact expressions for the linear complexity of each sequence are also given. The correlation property of our proposed sequence family is a little weak towards Welch bound, however, the linear complexity of each sequence is high, some of which can even reach p(p + 2).","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"324 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115321284","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
Two Classes of Large Families of Sequences with low Correlation 两类低相关大族序列
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408408
F. Zeng
{"title":"Two Classes of Large Families of Sequences with low Correlation","authors":"F. Zeng","doi":"10.1109/IWSDA.2007.4408408","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408408","url":null,"abstract":"In this paper, two classes of large families of sequences of length p<sup>n</sup>-1 is proposed, where p is a prime number, n is an even number, n = 2m. One of them is binary, the new sequences have large family size 2<sup>2n</sup> and seven-valued correlations, {-2<sup>m</sup>-1,-1,2<sup>m</sup>-1,2ldr2<sup>m</sup>-1,3ldr2<sup>m</sup>-1,4ldr2<sup>m</sup> -1,5 ldr2<sup>m</sup> -1}. The other is binary or ployphase, depending upon choice of the parameter p, the new sequences possess the large family size p(d-1)n, and at most 2d correlation levels, {-p<sup>m</sup> -1, -1,p<sup>m</sup> -1,2p<sup>m</sup> -1, ldrldrldr , (2d -2)p<sup>m</sup> -1}, where d is a positive integer such that d ges 2.1n addition, the later one includes the sequences with Niho-type decimations,2p<sup>m</sup>-1(called as Niho sequences for p = 2 and Helleseth sequences for p > 2,respectively) and 3 ldr2<sup>m</sup>-2, as special cases.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116689749","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
Virtually Bounded DSA Scheme and Its Analysis 虚拟有界DSA格式及其分析
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408392
M.Q. Sharif, S. Boussakta
{"title":"Virtually Bounded DSA Scheme and Its Analysis","authors":"M.Q. Sharif, S. Boussakta","doi":"10.1109/IWSDA.2007.4408392","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408392","url":null,"abstract":"This paper presents an alternative to existing dynamic spectrum allocation (DSA) schemes, in a flexible spectrum licensing environment where multiple networks coexist and interfere with each other. The proposed virtually bounded DSA scheme (VBS) takes a different approach to fairly manage the spectrum resources in response to temporal deviation in spectrum demands. In particular, a new concept of dynamic virtual boundary is introduced. Based on this concept, the VBS dynamically adjusts the virtual boundaries of spectrum blocks dedicated for the primary systems to reduce the occurrences where the insertion of guard bands is obligatory and consequently provides better spectral efficiency than existing Fragmented and Contiguous DSA schemes.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128169340","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
Optimal Bit and Power Allocation Algorithm in Multi-Carrier CDMA 多载波CDMA中的最优位功率分配算法
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408343
U. O. Ibom
{"title":"Optimal Bit and Power Allocation Algorithm in Multi-Carrier CDMA","authors":"U. O. Ibom","doi":"10.1109/IWSDA.2007.4408343","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408343","url":null,"abstract":"Multi-carrier code division multiple access (MC-CDMA) is a promising candidate for the air interface of 4G wireless networks. In MC-CDMA systems, a number of sub carriers per user are used for the high-rate data transmission, and each data modulated by a different sub earlier is transmitted through a different frequency band. Each data undergoes a different channel condition and arrives with a different error rate at the base station. By transmitting message data based on the channel state information (CSI), a new data transmission scheme called \"optimal bit and power allocation algorithm in multi-carrier CDMA\" is introduced in this paper. Simulated results have shown that the scheme yields a higher system capacity than a conventional MC-CDMA.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132958520","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
New Efficient Check Node Update Method for Improved Min-Sum LDPC Decoding 一种改进最小和LDPC译码的有效校验节点更新方法
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408346
Lu Xin, Xu Jun, Liang Yong-sheng
{"title":"New Efficient Check Node Update Method for Improved Min-Sum LDPC Decoding","authors":"Lu Xin, Xu Jun, Liang Yong-sheng","doi":"10.1109/IWSDA.2007.4408346","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408346","url":null,"abstract":"This paper has presented various min-sum related LDPC decoding algorithms and their typical hardware architectures of check node update in the scenario of parallel implementation. For one check node update of normalized min-sum algorithm, if the current row weight is dc, dc multiplications are needed. If dc is large, dc multiplications are needed, which leads to high complexity. In this article, one innovative method for check node update has been found, which can obviously reduce the number of multiplication operations for the normalized min-sum algorithm and the number of comparison/selection operations for the row weight matched min-sum algorithm of high rate LDPC codes. Simulations have claimed the performance of normalized min-sum and row weight matched min-sum is nearly the same as that of Log-BP, namely the optimal algorithm, which has shown that normalized min-sum and row weight matched min-sum are good choices for LDPC.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133474791","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
The Prefix Design and Performance Analysis of DFT-based Overlapped Frequency Division Multiplexing (OvFDM-DFT) System 基于dft的重叠频分复用(OvFDM-DFT)系统前缀设计及性能分析
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408398
Wang Jian, Yang Xun, Zhang Xi-lin, Daoben Li
{"title":"The Prefix Design and Performance Analysis of DFT-based Overlapped Frequency Division Multiplexing (OvFDM-DFT) System","authors":"Wang Jian, Yang Xun, Zhang Xi-lin, Daoben Li","doi":"10.1109/IWSDA.2007.4408398","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408398","url":null,"abstract":"This paper propose the theoretical analysis of the DFT based overlapped frequency division multiplexing (OvFDM)/non-orthogonal frequency division multiplexing(NOFDM) communication system, and investigates the impact of conventional cyclic-prefix and zero-padding cyclic-prefix respectively for the OvFDM-DFT system in the time-variant frequency-selective fading channels. The sub-carriers of the DFT based OvFDM/NOFDM communication system are overlapped together and the bandwidth can be larger than the frequency coherence bandwidth, so a kind of implicit frequency diversity will be exploited by the MLSD receiver, which will improve the system performance. Theoretical analysis and simulation results show that zero-padding cyclic-prefix has a much better performance than the conventional cyclic-prefix. The implicit frequency diversity ability of the OvFDM-DFT symbols is also verified by the simulations.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132228619","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: 33
An Internally Adaptive LDPC Coded Ultra Wideband-Impulse Radio System 内部自适应LDPC编码超宽带脉冲无线电系统
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408394
Jianhua Yang, Danfeng Zhao, Chunhui Zhao, Rui Xue
{"title":"An Internally Adaptive LDPC Coded Ultra Wideband-Impulse Radio System","authors":"Jianhua Yang, Danfeng Zhao, Chunhui Zhao, Rui Xue","doi":"10.1109/IWSDA.2007.4408394","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408394","url":null,"abstract":"In this paper, we propose an internally adaptive LDPC coded ultra wideband-impulse radio (IALC-UWB-IR) system which is able to adaptively select the code rate of the LDPC code and the number of pulse repetitions. Performance of the proposed system is evaluated under the UWB multipart channel proposed in the IEEE 802.15.3a standard, and the selective-RAKE receiver with maximal radio combining is used. Simulation result shows that the proposed 1ALC-UWB-IR system significantly outperforms the conventional UWB-1R systems.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114627917","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 Area Optimized Direct Digital Frequency Synthesizer Based on Improved Hybrid CORDIC Algorithm 基于改进混合CORDIC算法的面积优化直接数字频率合成器
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408368
Ru Xin, Xiaotong Zhang, Han Li, Qin Wang, Zhancai Li
{"title":"An Area Optimized Direct Digital Frequency Synthesizer Based on Improved Hybrid CORDIC Algorithm","authors":"Ru Xin, Xiaotong Zhang, Han Li, Qin Wang, Zhancai Li","doi":"10.1109/IWSDA.2007.4408368","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408368","url":null,"abstract":"This paper proposes a novel implementation technique for area optimized direct digital frequency synthesizer (DDFS) based on improved hybrid coordinate rotation digital computer (CORDIC) algorithm. Researches at algorithmic level focus on how to reduce algorithm complexity, such as cutting down all of rotational phase decision circuits and multipliers, simplifying scale factor with soft hardware co-design approach. At architectural level, the pipeline multilevel loop iteration implementation proposal is adopted for reusing shifting and adder-subtractor components highly. The design has been successfully integrated in a channel demodulation module of broadband network system on chip (SoC) platform. With generality, the technique can be also applied to other wireless network communication system.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124399253","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
A Robust Speech Enhancement Scheme on The Basis of Bone-conductive Microphones 一种基于骨传导传声器的鲁棒语音增强方案
2007 3rd International Workshop on Signal Design and Its Applications in Communications Pub Date : 2007-12-26 DOI: 10.1109/IWSDA.2007.4408396
Mingzhe Zhu, H. Ji, Falong Luo, Wei Chen
{"title":"A Robust Speech Enhancement Scheme on The Basis of Bone-conductive Microphones","authors":"Mingzhe Zhu, H. Ji, Falong Luo, Wei Chen","doi":"10.1109/IWSDA.2007.4408396","DOIUrl":"https://doi.org/10.1109/IWSDA.2007.4408396","url":null,"abstract":"This paper presents a novel speech enhancement scheme on the basis of bone-conductive microphones. High performance in non-stationary noisy environments is achieved by combining the following two techniques: the speech detection based on the bone-conductive microphone signal, and non-stationary noise suppression by adaptive spectral subtraction. Unlike regular air-conductive microphones, bone-conductive microphones are insensitive to environmental noises and background speech. By employing this advantage, we are able to detect very robustly speech in non-stationary noisy environments. Furthermore, based on the reliable speech detection results, the adaptive spectral subtraction can operate effectively even under low SNR conditions.","PeriodicalId":303512,"journal":{"name":"2007 3rd International Workshop on Signal Design and Its Applications in Communications","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115987036","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: 14
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