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Radio and Wireless Conference, 2003. RAWCON '03. Proceedings最新文献

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Thin substrate broadband slotted spiral antenna with vertical interconnects 具有垂直互连的薄衬底宽带开槽螺旋天线
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227943
B. Liu, A.M. Ferendeci
{"title":"Thin substrate broadband slotted spiral antenna with vertical interconnects","authors":"B. Liu, A.M. Ferendeci","doi":"10.1109/RAWCON.2003.1227943","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227943","url":null,"abstract":"Monolithically integrated into a 3D MMIC (multilayer microwave integrated circuit) T/R module, a novel 2-arm Archimedean slotted spiral antenna was designed and fabricated for broadband operation in X-band. The antenna was processed on a thin polyimide substrate (68 um thick, 0.0038 /spl lambda/g) with a bottom ground plane. A vertically interconnected wideband stripline balun was used to feed the antenna. Both simulation and measurement results showed that performance of the slotted spiral antenna on these substrates was improved when the slot width was reduced and became comparable to the substrate thickness. Return loss of less than -20 dB was measured for the spiral antenna throughput 2-18 GHz with the lowest value of -49 dB at 10.8 GHz. Uniform broadside radiation pattern was obtained with a gain variation of -12 /spl sim/ -1 dB. Also, near field power distribution was measured for a PCB version of the slotted spiral antenna with similar design parameters.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"359 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124527937","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
Practical constraints on reactively steered antenna arrays 反应导向天线阵列的实际限制
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227901
J.T. MacDonald, D. Ucci
{"title":"Practical constraints on reactively steered antenna arrays","authors":"J.T. MacDonald, D. Ucci","doi":"10.1109/RAWCON.2003.1227901","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227901","url":null,"abstract":"Reactively steered antenna arrays (RESAAs) can be steered electronically by varying their load impedances. To maximize radiation efficiency, the load impedance must be reactive to avoid ohmic losses. A simple means to implement the reactive loads is with varactors. This places further constraints on the load in that the load impedance must not only be imaginary but also negative. In this paper, prior work is reconsidered in light of this practical constraint. Simulations are performed to evaluate the beam steering and interference nulling of a hexagonal array with these constraints. The complexity of the array is minimized while providing performance suitable for some applications.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123222215","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 novel low-voltage low-power 5.8 GHz CMOS down-conversion mixer design 一种新型的低电压低功耗5.8 GHz CMOS下变频混频器设计
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227952
Xuezhen Wang, R. Weber
{"title":"A novel low-voltage low-power 5.8 GHz CMOS down-conversion mixer design","authors":"Xuezhen Wang, R. Weber","doi":"10.1109/RAWCON.2003.1227952","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227952","url":null,"abstract":"This paper presents a 5.8 GHz low voltage and low power down-conversion mixer design integrated in a TSMC 0.18 /spl mu/m CMOS process. The proposed method features that an RF input stage converts the RF input voltage to current, which is coupled to the core of Gilbert Cell using current source transistor at bottom and furthermore reduces the supply voltage. The LO frequency is at 5.6 GHz. The designed mixer requires only a 1.5 V supply voltage and consumes 6.89 mW DC power. At 5.8 GHz, this mixer has single-sideband noise figure (SSB NF) of 14.3 dB, with input return loss of -18.6 dB, third-order input intercept point (IIP3) of -2.94 dBm, and conversion gain of 7 dB.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116907680","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
System capacity in the forward link of CDMA systems CDMA系统前向链路的系统容量
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227884
Dongdong Li, J. Khoja, V. Prabhu
{"title":"System capacity in the forward link of CDMA systems","authors":"Dongdong Li, J. Khoja, V. Prabhu","doi":"10.1109/RAWCON.2003.1227884","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227884","url":null,"abstract":"In this paper, modified beta distribution of the second kind is used to characterize the fraction of base station power allocated to a mobile station in a power-controlled CDMA system. Power control error is incorporated in this model. Outage probability can be calculated using the incomplete beta function and system capacity can be obtained using a simple integral. The effects of the power control error and the maximum fraction of base station power allocated to the mobile station on the outage probability and system capacity are discussed. The analytical model in this paper can be used to evaluate system performance of a power-controlled CDMA system more accurately and effectively.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130980919","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 compact ferroelectric phase shifter using lumped-element quarter-wave-length transmission lines 采用集总元件四分之一波长传输线的紧凑型铁电移相器
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227954
Dongsu Kim, Sang-Soo Je, J. Kenney, P. Marry
{"title":"A compact ferroelectric phase shifter using lumped-element quarter-wave-length transmission lines","authors":"Dongsu Kim, Sang-Soo Je, J. Kenney, P. Marry","doi":"10.1109/RAWCON.2003.1227954","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227954","url":null,"abstract":"This paper presents the design and implementation of an all-pass network phase shifter based on a BaSrTiO/sub 3/ coated Al/sub 2/O/sub 3/ substrate for an 802.11b WLAN application. Two different variable resonant circuits are connected between two identical quarter-wave-length transmission lines, resulting in an all-pass network. The size of the phase shifter is reduced by employing /spl Pi/-section lumped-element networks, and thus the total size is only 2.4 mm x 2.6 mm. The optimum values of the inductor and the maximum phase shift are discussed with respect to the different capacitance and tunability (C/sub max//C/sub min/) of the capacitor at the series resonant circuits. The measured performance of the phase shifter shows a phase shift of more than 147/spl deg/ is achieved with an average insertion of 3.2 dB from 2.4 GHz to 2.5 GHz. The return loss of the phase shifter in the same frequency range is better than 10 dB for all bias states.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116221601","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
An approach towards improved energy-efficiency in wireless sensor nets 一种提高无线传感器网络能源效率的方法
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227933
S. Raghuwanshi, A. Mishra
{"title":"An approach towards improved energy-efficiency in wireless sensor nets","authors":"S. Raghuwanshi, A. Mishra","doi":"10.1109/RAWCON.2003.1227933","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227933","url":null,"abstract":"Wireless sensor networks (WSNs) are made up of sensor nodes that can only be equipped with limited energy resources, but can still be used over an extensive set of diverse applications. The traffic inherent to WSNs is however, variable and highly correlated. We analyze the energy-efficiency with the varying traffic in such networks. We expect sensor nodes to save more energy by using an adaptive scheme for varying traffic conditions giving robustness to different application scenarios. A random timing scheme for optimizing the radio on/off time-interval by adapting to traffic loads is discussed. The discussion in this paper aims to produce a reliable energy-aware sensing network, in spite of node failures, minimizing energy consumption at the same time.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132543648","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
Full synchronized distributed array antenna for CDMA base stations CDMA基站全同步分布式阵列天线
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227910
H. Hirayama, T. Hada, K. Fukino, Y. Takeuchi
{"title":"Full synchronized distributed array antenna for CDMA base stations","authors":"H. Hirayama, T. Hada, K. Fukino, Y. Takeuchi","doi":"10.1109/RAWCON.2003.1227910","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227910","url":null,"abstract":"Adaptive array antenna is one of the attractive technologies for cellular mobile communications systems for increase of capacity. For CDMA cellular base stations, we have designed a distributed configuration of array antenna, which is synchronized among two-dimensional arrange of sub-array antenna modules. This configuration has a capacity to accept flexible number of or arrange of sub-array antenna modules. All modules that formed array antenna are synchronized to make appropriate beam forming by the method of one-by-one addition between each adjacent module. We have built a prototype of this distributed array antenna with our original continuous auto-calibration circuits. The experimental performance of this calibration circuit was 0.1 dB and 1-degree accuracy. The prototype array antenna has experimentally performed less than 2 dB ripple and 11.3-degree roll-off (between -3 dB point and -20 dB point) of sector wide beams and 12.7-degree beam width (-3 dB) of user dedicated narrow beams.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134280376","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
ICI cancellation based channel estimation for OFDM systems 基于ICI对消的OFDM系统信道估计
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227905
Tevfik Yücek, H. Arslan
{"title":"ICI cancellation based channel estimation for OFDM systems","authors":"Tevfik Yücek, H. Arslan","doi":"10.1109/RAWCON.2003.1227905","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227905","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM), which is a multicarrier modulation scheme, splits high data rate information symbols into lower rate parallel data streams and transmits this parallel information on different orthogonal carriers. The loss of orthogonality among subcarriers causes inter-carrier interference (ICI), which affects both channel estimation and detection of OFDM data symbols. Channel estimation error degrades the performance of coherent receiver limiting capacity, data rate and performance of the overall OFDM system. This paper proposes a novel frequency-domain channel estimator, which mitigates the effects of ICI by jointly finding the frequency offset and channel frequency response (CFR). Unlike conventional channel estimation techniques, where ICI is treated as part of the noise, the proposed approach considers the effect of frequency offset in estimation of CFR. A binary search algorithm is used to find the present frequency offset and CFR jointly. Variance of the frequency offset estimator and mean-square error (MSE) performances for conventional least-squares (LS) estimator and the proposed method are obtained using computer simulations. The variance of the jointly estimated frequency offset is found to be very close to the Cramer-Rao lower bound. It is shown that the proposed method outperforms LS channel estimator especially in ICI dominated situations.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114494001","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
Shorted biconical antenna for ultra-wideband applications 用于超宽带应用的短型双锥天线
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227913
J. D. Morrow
{"title":"Shorted biconical antenna for ultra-wideband applications","authors":"J. D. Morrow","doi":"10.1109/RAWCON.2003.1227913","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227913","url":null,"abstract":"This paper presents a simple low-gain omnidirectional ultra-wideband (UWB) antenna. The VSWR is 2:1 or better over the FCC-specified UWB operating band of 3.1 GHz to 10.6 GHz, and the total combined omnidirectionality is better than 12 dB.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117098931","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
Collaborative security architecture for black hole attack prevention in mobile ad hoc networks 移动自组网中黑洞攻击防御的协同安全架构
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings Pub Date : 2003-09-08 DOI: 10.1109/RAWCON.2003.1227896
A. Patcha, Amitabh Mishra
{"title":"Collaborative security architecture for black hole attack prevention in mobile ad hoc networks","authors":"A. Patcha, Amitabh Mishra","doi":"10.1109/RAWCON.2003.1227896","DOIUrl":"https://doi.org/10.1109/RAWCON.2003.1227896","url":null,"abstract":"An ad hoc network is a group of wireless mobile computers (or nodes) wherein individual nodes cooperate by forwarding packets for each other to allow nodes to communicate beyond direct wireless transmission range. The Black hole attack is an important problem that could happen easily in ad hoc networks especially in popular on-demand protocols like the ad hoc on-demand distance vector routing (AODV). Prior research in ad hoc networking has generally looked into the routing problem in a non-adversarial network setting, assuming a reasonably trusted environment. This paper proposes a collaborative architecture to detect and exclude malicious nodes that act in groups or alone. The focus is on the network layer, using the ad hoc on-demand distance vector routing (AODV) protocol as an example. This paper describes an extension to the watchdog method to incorporate a collaborative architecture to tackle collusion among nodes.","PeriodicalId":177645,"journal":{"name":"Radio and Wireless Conference, 2003. RAWCON '03. Proceedings","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115765544","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: 163
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