发布求助
文献互助 智能选刊 最新文献

2007 Asia-Pacific Conference on Communications最新文献

筛选
英文 中文
Packet delivery strategies for sea surface networks 海面网络的分组传送策略
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433449
Chia-Sheng Tsai, Han-Ping Wang
{"title":"Packet delivery strategies for sea surface networks","authors":"Chia-Sheng Tsai, Han-Ping Wang","doi":"10.1109/APCC.2007.4433449","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433449","url":null,"abstract":"In this paper, we proposed a more reliable and stable ad hoc routing method which includes Fuzzy concept for sea surface networks. There, moving sensors arc not installed fixed on off-shore structures and affected by the sea waves. That is, sensors deployed on sea surface are floating continuously and the distribution of sensors varies all the time. Therefore, we shall make some modifications on existing protocols by using fuzzy membership function to decide the best choice of routing path to meet the requirement of sea surface networks. Also, adjusting the transmission range of sensor nodes comes to a better compromise between increasing the chances of reaching neighbor nodes and decreasing the possibility of fail to complete the packet delivery process because of lack of power.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126307550","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
Efficient implementation of odd-order lagrange-type variable fractional-delay digital filters 奇阶拉格朗日型可变分数延迟数字滤波器的高效实现
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433464
T. Deng
{"title":"Efficient implementation of odd-order lagrange-type variable fractional-delay digital filters","authors":"T. Deng","doi":"10.1109/APCC.2007.4433464","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433464","url":null,"abstract":"Lagrange-type variable fractional-delay (VFD) digital filters can be directly implemented as the well-known Farrow structure, but the subfilter coefficients are not symmetric or anti-symmetric. This paper presents a method for transforming an odd-order Lagrange-type VFD filter into a new one whose more than half subfilters have symmetric or anti-symmetric coefficients, which leads to an efficient implementation that reduces the computational complexity required in the VFD filtering process and saves hardware cost for storing independent subfilter coefficients. Several interesting symmetric properties of the resulting subfilter coefficients are rigorously proved and also illustrated through examples.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125865007","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
Capacity and outage performance of regional signal combining using distributed antennas 分布式天线区域信号组合的容量和中断性能
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433548
Jonghyun Park, Euiseok Song, Jaewon Kim, Seongtaek Hwang, Wonjin Sung
{"title":"Capacity and outage performance of regional signal combining using distributed antennas","authors":"Jonghyun Park, Euiseok Song, Jaewon Kim, Seongtaek Hwang, Wonjin Sung","doi":"10.1109/APCC.2007.4433548","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433548","url":null,"abstract":"For cellular systems with base stations (BS's) equipped with distributed antennas, various cooperative signal transmission strategies can be employed. In this paper, we analyze the trade-off between the transmission capacity and the outage probability when downlink signals from two geographically separated antennas are combined. It is demonstrated a significant reduction in the outage probability can be achieved while simultaneously improving the capacity, when signal combining is selectively performed based on the carrier-to-interference ratio (CIR) measurement at a given mobile station (MS). Experimental results show the outage (CIR less than 0 dB) probability reduces by 54.1% with the capacity increase of 7.4% for the fading channel condition.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125995739","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
Estimates of ambient effects on point-to-point wireless channels 环境对点对点无线信道影响的估计
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433432
M. Mashhouri, R. Hafez
{"title":"Estimates of ambient effects on point-to-point wireless channels","authors":"M. Mashhouri, R. Hafez","doi":"10.1109/APCC.2007.4433432","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433432","url":null,"abstract":"This paper provides an extension of our previous work in which we provided a model for received power estimation in 802.11a wireless point-to-point (PTP) links using commercially available WLAN cards in single or multi-hop configurations. The model describes how the link attenuation changes with environmental factors such as the ambient humidity and temperature. This model, uses a gradual change in refraction index as the main factor for the curvature of the radio waves in a simple manner for links using parabolic reflector antennas. Based on the proposed model for the effect of environmental factors, the received power of the PTP links is estimated. This model considers links using parabolic antennas.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"14 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126071959","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 10.7-MHz fully balanced, Q-of-267, 103-dB-dynamic-range current-tunable bandpass filter 10.7 mhz全平衡，Q-of-267, 103db动态范围电流可调带通滤波器
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433504
W. Sa-ngiamvibool, B. Srisuchinwong
{"title":"A 10.7-MHz fully balanced, Q-of-267, 103-dB-dynamic-range current-tunable bandpass filter","authors":"W. Sa-ngiamvibool, B. Srisuchinwong","doi":"10.1109/APCC.2007.4433504","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433504","url":null,"abstract":"A 10.7-MHz fully balanced, high-Q, wide-dynamic-range current-tunable bandpass filter is presented. The technique is relatively simple based on three fully balanced components, i.e. an adder, a low-Q-based bandpass filter and a differential amplifier. The high-Q factor is possible through a tunable bias current. As a simple example at 10.7 MHz, the paper demonstrates the high-Q factor of 267, the total low output noise of 2.089 muVrms, the 3rd-order intermodulation-free dynamic range (IMFDR3) of 82.59 dB, and the wide dynamic range of 103 dB at 1% IM3. The centre frequency is current tunable over 3 orders of magnitude. Comparisons to other 10.7-MHz approaches are also included.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130469042","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
Rain attenuation in broadband satellite 宽频卫星的雨水衰减
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433492
E. Nukfron, S. Sitichepak
{"title":"Rain attenuation in broadband satellite","authors":"E. Nukfron, S. Sitichepak","doi":"10.1109/APCC.2007.4433492","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433492","url":null,"abstract":"This paper presented the effects of attenuation from rain rate together with rain drop size distribution analysis on the model of transmitter broadband satellite in Ka-band frequency. We illustrated a new model by simulating transmission broadband signal and studied the rain attenuation which has effects to high frequency. The results of the model were represented by the relation between error probability and S/N. Moreover, the numbers of re-transmission cycles for completing the amount of data were also presented. The attenuation would be illustrated in log normal distribution forms and in PDF terms. The simulation would be run by taking error probability (Pe) of noise at 0.4, 0.04, 0.004 and 0.004.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130875950","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
A new variable step-size equivariant adaptive source separation algorithm 一种新的变步长等变自适应信源分离算法
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433478
Xiaofu Xie, Qingyan Shi, R. Wu
{"title":"A new variable step-size equivariant adaptive source separation algorithm","authors":"Xiaofu Xie, Qingyan Shi, R. Wu","doi":"10.1109/APCC.2007.4433478","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433478","url":null,"abstract":"In this paper, variable step-size blind source separation (BSS) algorithms are investigated. Since it is hard to achieve both fast convergence and stable tracking performance for a given step-size, step-size is crucial for the equivariant adaptive source separation (EASI) algorithms. Firstly, the measurement of the independence for the output signals is analyzed, then, a new EASI algorithm whose step-size is changed adaptively by mutual information is proposed. Computer simulation results show that the new algorithm has satisfactory convergence and stable tracking performance.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"444 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131565116","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
Adaptive anti-jamming algorithm based on the spatial and temporal characteristics of GPS signal 基于GPS信号时空特性的自适应抗干扰算法
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433532
Ping Li, D. Lu, R. Wu, Zhigang Su, Wei Huang
{"title":"Adaptive anti-jamming algorithm based on the spatial and temporal characteristics of GPS signal","authors":"Ping Li, D. Lu, R. Wu, Zhigang Su, Wei Huang","doi":"10.1109/APCC.2007.4433532","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433532","url":null,"abstract":"In this paper, an algorithm is presented for adaptive anti-jamming in global position system (GPS). The proposed algorithm combines the subspace technique with the cyclic adaptive beamforming (CAB) algorithm so that it can suppress non-periodic jammers and/or those with different direction of arrival from the GPS signal simultaneously. Simulation results demonstrate the proposed algorithm can effectively suppress more complex jammers, even under very lower signal-to-noise ratio.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130047515","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
Fingerprint features extraction using curve-scanned DCT coefficients 基于曲线扫描DCT系数的指纹特征提取
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433498
S. Tachaphetpiboon, T. Amornraksa
{"title":"Fingerprint features extraction using curve-scanned DCT coefficients","authors":"S. Tachaphetpiboon, T. Amornraksa","doi":"10.1109/APCC.2007.4433498","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433498","url":null,"abstract":"This paper proposes a fingerprint features extraction method using curve-scanned DCT coefficients. Generally, the fingerprint features contained in a fingerprint image, such as ridge line patterns and minutiae point, can be extracted from the DCT domain, and used for fingerprint matching. By considering the oscillate pattern contained in the top-left corner of DCT coefficients, we can divide those coefficients in curve-scanned fashion, extract DCT features from the divided DCT coefficients, and use them for matching purpose. To evaluate the proposed method, we use the k-NN classifier to measure the recognition rate, and compare the results obtained from our extraction method to that from the DWT based method [5] and the zigzag-scanned based method [6]. According to the results, the proposed method outperforms the other two, particularly in both recognition rate and processing time.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133476002","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
Multiuser antenna selection for zero forcing beamforming based MIMO OFDMA 基于零强迫波束形成的MIMO OFDMA多用户天线选择
2007 Asia-Pacific Conference on Communications Pub Date : 2007-10-01 DOI: 10.1109/APCC.2007.4433511
Jianhua Zhang, Guangyi Liu, Weidong Wang
{"title":"Multiuser antenna selection for zero forcing beamforming based MIMO OFDMA","authors":"Jianhua Zhang, Guangyi Liu, Weidong Wang","doi":"10.1109/APCC.2007.4433511","DOIUrl":"https://doi.org/10.1109/APCC.2007.4433511","url":null,"abstract":"Multiuser Zero Forcing Beamforming (MU-ZFB) can be adopted to exploit the multiuser spatial multiplexing gain and diversity gain in downlink by spatial multiuser scheduling. On the other hand, multiuser joint subcarrier allocation can obtain multiuser diversity gain in frequency domain. In this paper, a novel joint Spatial and Frequency Proportional Fairness (SFPF) scheduler is proposed to achieve the spatial- frequency multiuser diversity gain for multiuser ZFB based MIMO OFDMA system while guarantees the multiuser fairness. To approach the spatial multiuser diversity gain, three antenna selection algorithms are proposed, optimal, random and suboptimal antenna selection and their performance is evaluated in a single cell scenario. The optimal algorithm can achieve the best performance but has the highest complexity. The random algorithm has the worst performance but the lowest complexity.","PeriodicalId":282306,"journal":{"name":"2007 Asia-Pacific Conference on Communications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114502741","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
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信