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2009 International Conference on Wireless Communications & Signal Processing最新文献

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Channel assignment strategies of IEEE 802.11 WLAN in a shared public hotspot environment 共享公共热点环境下IEEE 802.11 WLAN信道分配策略
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371621
S. Srilasak, K. Wongthavarawat, Kitiwat Limmongkol, S. Siwamogsatham
{"title":"Channel assignment strategies of IEEE 802.11 WLAN in a shared public hotspot environment","authors":"S. Srilasak, K. Wongthavarawat, Kitiwat Limmongkol, S. Siwamogsatham","doi":"10.1109/WCSP.2009.5371621","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371621","url":null,"abstract":"The demand of wireless access in anywhere and anytime drives the deployment of Wi-Fi hotspot. Multiple service providers may deploy the Wi-Fi hotspot in the same area to response to the users' needs. Channel assignment for the access point becomes the challenging problem, especially in the situation that other service providers do not provide full cooperation. Channel assignment of APs need to be carefully determined to obtain the optimal performance. This paper proposes the channel assignment strategies of IEEE 802.11 WLAN to provide the optimum service performance among shared service providers. The series of experiment presented in this paper provides the basis of the proposed the channel assignment strategies.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"443 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123098985","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 joint time and frequency offset estimation method for OFDM systems 一种新的OFDM系统时频联合估计方法
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371461
Amirhossein Hashemi Sajadi, H. Bakhshi, Mehrdad Manaffar, M. Naderi
{"title":"A new joint time and frequency offset estimation method for OFDM systems","authors":"Amirhossein Hashemi Sajadi, H. Bakhshi, Mehrdad Manaffar, M. Naderi","doi":"10.1109/WCSP.2009.5371461","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371461","url":null,"abstract":"Orthogonal Frequency Division Multiplexing (OFDM) systems are more sensitive to timing and frequency offsets than single carrier systems. This Paper presents a method of joint time and frequency synchronization for OFDM systems. The synchronization technique is examined in both AWGN and multipath fading environments. Compared with conventional schemes, the proposed schemes can achieve smaller mean and mean square error (MSE) obtained by simulations.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123172337","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 4.8 GHz RF CMOS wideband LC VCO for wireless sensor networks RFICs 一种用于无线传感器网络rfic的4.8 GHz射频CMOS宽带LC压控振荡器
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371587
Xiangning Fan, Zeng Jun, Xiaoguang Chen
{"title":"A 4.8 GHz RF CMOS wideband LC VCO for wireless sensor networks RFICs","authors":"Xiangning Fan, Zeng Jun, Xiaoguang Chen","doi":"10.1109/WCSP.2009.5371587","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371587","url":null,"abstract":"A 4.8GHz LC voltage controlled oscillator (VCO) for Wireless Sensor Network (WSN) SoC RFIC chipset is designed based on SMIC 0.18 μm 1P6M RF CMOS process. The core circuit adopts complementary differential negative resistance structure with resistor biasing which achieves good phase noise performance. The 2 bit switched capacitor array provides extra tuning range. The chip size is 600μm×475μm with testing pads. With a 1.8V supply voltage, the post-simulation and chipset measured results show that the achieved maximum 40% tuning range can perfectly compensating the deviation due to process corners. And the measured phase noise is −96dBc/Hz@3MHz with the carrier be 4.8GHz. Besides, the operating current of the whole circuit is less than 7mA.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123610148","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
Gabor feature-based complete fisher discriminant framework for facial feature extraction 基于Gabor特征的人脸特征提取完全fisher判别框架
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371732
Zhiqiang Zeng
{"title":"Gabor feature-based complete fisher discriminant framework for facial feature extraction","authors":"Zhiqiang Zeng","doi":"10.1109/WCSP.2009.5371732","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371732","url":null,"abstract":"In this paper, we propose a novel feature extraction approach using Gabor feature based complete fisher discriminant algorithm (GCFD). Four main steps are involved in the proposed GCFD: (i) Gabor features of different scales and orientations are extracted by the convolution of Gabor filter bank and original gray images; (ii) Complete fisher discriminant algorithm (CFD) is used for feature dimensionality reduction and to extract all discrimination information; (iii) Feature fusion algorithm and Euclidean distance based nearest neighbor classifier are finally used for classification. (iv)Simulation results show the effectiveness of our proposed GCFD.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122138809","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
Group mobility in wireless sensor network 无线传感器网络中的群移动性
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371420
Rong Chai, Ya-Lai Zhao, Qianbin Chen, Lun Tang
{"title":"Group mobility in wireless sensor network","authors":"Rong Chai, Ya-Lai Zhao, Qianbin Chen, Lun Tang","doi":"10.1109/WCSP.2009.5371420","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371420","url":null,"abstract":"Group mobility management in wireless sensor network (WSN) is of particular importance as it is can be found in many practical application scenarios. In this paper, a group mobility scenario in WSN is considered and the data collected by the sensor nodes in the group is assumed to transmit either inside the group or to the corresponding node (CN) through the IP-based backbone network. Traditional WSN protocols can be applied to support the data transmission inside the group. To support the data transmission through the internet, the integration of WSN with IP-based network is required and network mobility (NEMO) protocol can be employed. As NEMO is designed for IP network which is not compatible with WSN, particular consideration of NEMO protocol and the characteristics of WSN should be taken in applying the NEMO protocol. In this paper, the protocol stacks of WSN and the standard NEMO protocol are introduced. For WSN using several typical protocols supporting IP packet transmission, the application of NEMO is analyzed and summarized.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122697689","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
The application of compressed sensing in wireless sensor network 压缩感知技术在无线传感器网络中的应用
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371386
Peng Zhang, Cheng Chen, Minrun Liu
{"title":"The application of compressed sensing in wireless sensor network","authors":"Peng Zhang, Cheng Chen, Minrun Liu","doi":"10.1109/WCSP.2009.5371386","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371386","url":null,"abstract":"This paper firstly introduces the compressed sensing theory that is very hot in recent research. Our research combines the compressed sensing with wireless sensor network to improve the prior classical formulas due to the great advantage of capabilities of compressing data in large scale wireless network. When the transmission data decrease sharply, the throughput increases obviously in our research models. The traditional analysis of capacity can be revised to the order of Θ(√nW ÷ M √log n) in our network mechanism. Meanwhile the ideal lower bound is approximate to Θ(W÷M). The two results bound the capacity in wireless sensor network with the help of compressed sensing theory. At last, we analyze the delay in this system. Queuing theory facilitates our analysis, thus the result 1 ÷ µ − λ can help us for the further future work.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122770364","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
A new access algorithm for PCF modes in wireless LANs 一种新的无线局域网PCF模式接入算法
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371620
Shengbin Liao, W. Cheng
{"title":"A new access algorithm for PCF modes in wireless LANs","authors":"Shengbin Liao, W. Cheng","doi":"10.1109/WCSP.2009.5371620","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371620","url":null,"abstract":"In this paper, a new Point Coordination Function (PCF) scheme, NPCF is presented, which is based on CSMA/CA with equal backoff window in all stations rather than polling mechanism, it can decrease delay and improve throughput, and is also different with Distributed Coordination Function (DCF). NPCF is motivated by the following ideas: in the access method of PCF, a point coordinator (PC) performing the role of the polling master knows some information of the network, such as the number of active stations, the performance of NPCF based on CSMA/CA is better than PCF based on polling by using these information. Analysis and simulation results validate our conclusion.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"326 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122868437","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 1.2 V 3.1–10.6 GHz CMOS low noise amplifier with 24 dB gain and 2.4 dB noise figure 1.2 V 3.1-10.6 GHz CMOS低噪声放大器，增益24 dB，噪声系数2.4 dB
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371445
Sun Limei
{"title":"A 1.2 V 3.1–10.6 GHz CMOS low noise amplifier with 24 dB gain and 2.4 dB noise figure","authors":"Sun Limei","doi":"10.1109/WCSP.2009.5371445","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371445","url":null,"abstract":"This paper presents a 3.1–10.6 GHz low noise amplifier (LNA) for ultra-wideband (UWB) applications. The proposed wideband amplifier comprises a single-ended resistor feedback LNA with wideband input matching and a single-to-differential voltage buffer which improves the power gain of the amplifier. The LNA achieves a 23.2 dB voltage gain and input return loss below −13 dB from 3.1–10.6 GHz, 2.4 dB and 2.7 dB minimum and maximum noise figure (NF), and −11.9 dBm IIP3 at 6 GHz. The proposed LNA is realized in 0.13 μm CMOS technology and occupies 0.32 mm2 area. The power consumption is 12.2 mW with 1.2 V supply.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129304611","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: 6
Performance comparisons between slotted and unslotted spread spectrum ad hoc networks 有槽和无槽扩展频谱自组网的性能比较
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371705
Shi-dong Sun, Jingnan Nie
{"title":"Performance comparisons between slotted and unslotted spread spectrum ad hoc networks","authors":"Shi-dong Sun, Jingnan Nie","doi":"10.1109/WCSP.2009.5371705","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371705","url":null,"abstract":"Slotted and unslotted spread spectrum ad hoc networks are investigated, and the probability of packet successful transmission and the throughput performance are compared between the two kinds of networks in this paper. The expressions of the packet successful transmission probability and the throughput over Rayleigh fading channels are derived, and the impacts of forward error correction (FEC) coding scheme on the network performance are quantitatively analyzed. It is shown that, a significant improvement of the network performance can be obtained by using FEC coding scheme for these two systems. In addition, with the same FEC coding, the network performance of unslotted networks is slightly inferior to that of slotted networks, however, the performance degradation caused by unslotted access can be compensated by introducing FEC coding scheme in spread spectrum ad hoc networks.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131488629","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
On the out-of-band radiation of DFT-based OFDM using pulse shaping 基于dft的OFDM带外辐射脉冲整形研究
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371526
Renhui Xu, Hai Wang, Ming Chen
{"title":"On the out-of-band radiation of DFT-based OFDM using pulse shaping","authors":"Renhui Xu, Hai Wang, Ming Chen","doi":"10.1109/WCSP.2009.5371526","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371526","url":null,"abstract":"OFDM is one of the best physical-layer candidates for cognitive radio (CR) systems, but rectangular pulse shaping gives rise to large spectrum sidelobes and interferes with the licensed user on the adjacent band. In this paper, an approach is derived based on the signal continuity to measure the spectral decay rate of the shaping pulse for OFDM. And a novel family of pulses, the power of sech function, is proposed to suppress out-of-band radiation. Several pulse shaping functions are applied to the OFDM system and compared through illustration.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122005278","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
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