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2007 International Symposium on Intelligent Signal Processing and Communication Systems最新文献

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New wideband DOA estimation algorithm for planar arrays 平面阵列宽带DOA估计新算法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445827
Chen Peng, Hou Chao-huan, Ma Xiao-chuan, L. Yi-hui, Yang Jun
{"title":"New wideband DOA estimation algorithm for planar arrays","authors":"Chen Peng, Hou Chao-huan, Ma Xiao-chuan, L. Yi-hui, Yang Jun","doi":"10.1109/ISPACS.2007.4445827","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445827","url":null,"abstract":"Direction of arrival (DOA) estimation for wideband signals is a key issue in array signal processing. The widely adopted coherent signal subspace method(CSSM) focuses the signal subspaces at various frequencies into a common one through focus matrices preprocessing. The preliminary DOAs estimation is required by the classical CSSM to compute the focusing matrices. But the error of preliminary DOAs estimation sometimes will degrade the performance of the classical CSSM seriously. In this paper, we propose the new wideband DOA estimation algorithm for planar arrays which is also a kind of CSSM but does not need the initial DOAs estimation. Computer simulation is presented to illustrate the effectiveness of our algorithm.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"127 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132152832","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
Improved real-valued clonal selection algorithm based on a novel mutation method 基于新突变方法的改进实值克隆选择算法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445974
Maoguo Gong, L. Jiao, Lining Zhang, Wenping Ma
{"title":"Improved real-valued clonal selection algorithm based on a novel mutation method","authors":"Maoguo Gong, L. Jiao, Lining Zhang, Wenping Ma","doi":"10.1109/ISPACS.2007.4445974","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445974","url":null,"abstract":"Chaos theory describes complex motion and the dynamics of nonlinear systems. As a complex nonlinear system, the immune system is chaotic. This paper introduces chaos into the clonal selection algorithm by a novel mutation method, self-adaptive chaotic mutation (SACM). In detail, based on the logistic chaotic sequence, SACM extracts antibody's affinity and distribution to adjust the mutation scale. Compared with the clonal selection algorithm using random mutation and standard genetic algorithm, the improved clonal selection algorithm can enhance the precision and stability, and overcome prematurity effectively with a high convergence speed.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133724496","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: 15
Direction of arrival estimation based on the dual delay line approach for binaural hearing aid microphone arrays 基于双耳助听器麦克风阵列双延迟线方法的到达方向估计
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445829
Stefan Goetze, T. Rohdenburg, V. Hohmann, B. Kollmeier, K. Kammeyer
{"title":"Direction of arrival estimation based on the dual delay line approach for binaural hearing aid microphone arrays","authors":"Stefan Goetze, T. Rohdenburg, V. Hohmann, B. Kollmeier, K. Kammeyer","doi":"10.1109/ISPACS.2007.4445829","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445829","url":null,"abstract":"Multi-channel beamformer algorithms are promising solutions for noise reduction in hearing aids as they exploit the spatial distribution of the interfering signals and therefore in general lead to less signal distortion than single channel algorithms. Beamformers need a priori information about the microphone array and the direction of arrival of the target speech source. For head-worn arrays it is usually assumed that the user physically steers the arrays' look direction toward the desired speech source. This may become unsatisfying for the hearing aid user for high directivity beamformers with a small main lobe and when the target signal source is moving. In this contribution an automatic steering (electronic control of the look direction) is applied based on the dual delay line approach after Liu et al. [1]. This approach is modified to be applicable for head-mounted hearing-aid arrays. We show that the original free-field approach does not work on a head-mounted array because of the inappropriate propagation model. If we apply the true HRTF or a spherical head propagation model, the estimate is reliable within plusmn8deg degree mean estimation error for an input SNR of 10 dB or higher. However, for lower SNR the method seems to be not robust enough.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114984900","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: 19
Palmprint recognition using fusion of local and global features 融合局部和全局特征的掌纹识别
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445969
Xin Pan, Q. Ruan, Yanxia Wang
{"title":"Palmprint recognition using fusion of local and global features","authors":"Xin Pan, Q. Ruan, Yanxia Wang","doi":"10.1109/ISPACS.2007.4445969","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445969","url":null,"abstract":"Palmprint recognition is a rapidly developing biometrics technology over the last decade. However, there exist some typical problems when capturing palmprint images. First, the delta region in the center palm will raise the uneven light and brightness of the palmprint images varying with hand pressure, stretching and palm structure. Second, it is hard to align the palmprint images precisely to the same position, especially when the subjects are required to spread their hand on the scanner surface, even for the same palm. Either the global or the local features cannot satisfy the need for high recognition accuracy. Therefore, we propose a novel method using fusion of local and global features, extracted by non-negative factorization with sparseness constraint (NMFsc) and prominent component analysis (PCA), respectively, to improve the recognition performance. Experiments demonstrate the strong supplementary between local and global features for palmprint recognition.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128315512","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
Comparative Performance Analysis of WiMAX and WLAN with WPAN Coexistence in UL Band WiMAX与WLAN在UL频段WPAN共存的性能对比分析
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445940
S. Suansook, S. Aramvith, P. Prapinmongkolkarn
{"title":"Comparative Performance Analysis of WiMAX and WLAN with WPAN Coexistence in UL Band","authors":"S. Suansook, S. Aramvith, P. Prapinmongkolkarn","doi":"10.1109/ISPACS.2007.4445940","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445940","url":null,"abstract":"Wireless local area networks (WLANs), WiMAX, and wireless personal area networks (WPANs) are currently being deployed in the same unlicensed radio frequency bands. In these bands, within and between some of these systems, interference becomes a major issue. Interference investigations from a wide variety of wireless systems are hard to perform. In this paper, a method is further developed to evaluate the impact of Bluetooth interferences on WLAN IEEE 802.11b and WiMAX IEEE 802.16 network performance. A closed form expression is presented for the probability of collision, Pr[C]. The approach is then extended to examine the coexistence between WiMAX IEEE 802.16 and Bluetooth services in unlicensed band of 2.4 GHz.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128734120","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
Performance analysis of different HSDPA equalizers under the measured outdoor channels 不同HSDPA均衡器在室外信道下的性能分析
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4446007
Chi-Min Li, Jia-Chyi Wu, J. Huang, I. Tang
{"title":"Performance analysis of different HSDPA equalizers under the measured outdoor channels","authors":"Chi-Min Li, Jia-Chyi Wu, J. Huang, I. Tang","doi":"10.1109/ISPACS.2007.4446007","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4446007","url":null,"abstract":"To restore the orthogonality of the spreading code, an equalizer is adopted at the receiving site for a HSDPA system. In this paper, BER performance and complexity of various equalizer methods are compared and analyzed under measured outdoor channels. Besides, a FFT-circulant with tapering equalization approach is proposed for the downlink HSDPA receiver. Results show that with tapering technique, the fast FFT-circulant equalizer can ease its high conditional number problem at a high SNR multipath channel. Simulations also show that the CG method has a satisfactory BER improvement. However, its performance depends notably on its iterative number and requires higher computational complexity than the FFT-circulant with tapering method.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134585307","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 opportunistic cooperative MAC protocol based on cross-layer design 一种基于跨层设计的机会合作MAC协议
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445987
Yuan Yuan, B. Zheng, Wentao Lin, C. Dai
{"title":"An opportunistic cooperative MAC protocol based on cross-layer design","authors":"Yuan Yuan, B. Zheng, Wentao Lin, C. Dai","doi":"10.1109/ISPACS.2007.4445987","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445987","url":null,"abstract":"In this paper, a novel cooperative MAC protocol in wireless ad hoc networks has been proposed to improve the performance of the IEEE 802.11 MAC protocol. A cross-layer method has been applied, by acquiring instantaneous channel information to select relay nodes. Opportunistic cooperative strategy is also exploited to use relay only when it can improve the performance of network system. We implement our protocol on NS2 platform, and simulation results show that opportunistic cooperative MAC (OC-MAC) protocol significantly outperforms IEEE 802.11 in terms of throughput and delay.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134012903","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: 16
Differential en/decoding using APSK signals for distributed MIMO 差分编码/解码使用APSK信号的分布式MIMO
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445937
Defu Sun, Youxi Tang, S. Shao, Shaoqian Li
{"title":"Differential en/decoding using APSK signals for distributed MIMO","authors":"Defu Sun, Youxi Tang, S. Shao, Shaoqian Li","doi":"10.1109/ISPACS.2007.4445937","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445937","url":null,"abstract":"This paper proposes a differential modulation scheme using amplitude-phase shift keying (APSK) signals for distributed MIMO systems where neither the transmitter nor the receiver knows channel knowledge. The bandwidth efficiency of the proposed scheme is the same as V-BLAST scheme, and it can be applied to the systems with any number of transmit and receive antennas. Simulation results show that the bit error rate (BER) performance is not same in different channel propagation delay cases, and the optimum delay time for two transmit antenna system is about 0.6 Ts (where Ts is symbol period).","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134080616","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
Evaluation of level crossing rates and fade durations for multihop Nakagami fading channels with an amplify-and-forward relay 带放大转发中继的多跳中川衰落信道的平交速率和衰落持续时间的评估
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445817
Y. Chau, K. Yung-Ta Huang
{"title":"Evaluation of level crossing rates and fade durations for multihop Nakagami fading channels with an amplify-and-forward relay","authors":"Y. Chau, K. Yung-Ta Huang","doi":"10.1109/ISPACS.2007.4445817","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445817","url":null,"abstract":"The average level crossing rates (LCR) and average fade durations (AFD) are analyzed for the multihop Nakagami fading channel with an amplify-and-forward (AF) relay. To evaluate the average LCR and AFD in closed-forms, their lower bound and upper bound are derived. Numerical results with different values of fading parameters are presented to illustrate the performance.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133414775","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: 4
A VQ-based data hiding scheme 基于vq的数据隐藏方案
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445946
Qiu Yingqiang, Feng Gui, Du Jixiang, Liu Jinghua
{"title":"A VQ-based data hiding scheme","authors":"Qiu Yingqiang, Feng Gui, Du Jixiang, Liu Jinghua","doi":"10.1109/ISPACS.2007.4445946","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445946","url":null,"abstract":"A novel VQ-based data hiding scheme using nearest neighbor labeling method and II macr matrix as embed/extract matrix is presented in this paper. According to the nearest relationship between codebook codewords, the labeled value of every codeword by the nearest-neighbor labeling method was different from its nearest codeword, based on which, using II macr matrix, as many as m bits data can be embedded in every 2m VQ coded indexes where at most [m/2] indexes aren't optimum. The simulated results by the computer showed that the VQ-based information hiding method has larger capacity and better imperceptibility.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"92 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116609656","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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