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IEEE Conference on Ultra Wideband Systems and Technologies, 2003最新文献

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Adaptive rate control with chip discrimination in UWB networks UWB网络中芯片识别的自适应速率控制
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-16 DOI: 10.1109/UWBST.2003.1267831
W. M. Lovelace, J. Townsend
{"title":"Adaptive rate control with chip discrimination in UWB networks","authors":"W. M. Lovelace, J. Townsend","doi":"10.1109/UWBST.2003.1267831","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267831","url":null,"abstract":"A fundamental concern of any ad-hoc network is the mitigation of potential near/far power disparities that can occur anytime a node is communicating with a distant node in the presence of very close interfering transmitters. In this paper, we present a technique for adjusting the number of chips/bit to maximize throughput in such poor near/far power ratio environments. The technique leverages information derived from our chip discrimination approach, and also exploits the low duty cycle nature of ultra-wideband (UWB) radio. We present this simple method for detection of near pulse interference and develop it as one component for a peer-to-peer MAC layer protocol, to effect more efficient transmission rate control using only locally derived input. We demonstrate the efficacy of the technique using simulation in bursty, pulse limited environments. The technique provides improved throughput compared to fixed parameter links and equivalent theoretical M|D|1 queues.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124619421","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
Challenges for a new integrated ultra-wideband (UWB) source 新型集成超宽带(UWB)信号源面临的挑战
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-16 DOI: 10.1109/UWBST.2003.1267879
A. Azakkour, M. Regis, F. Pourchet, G. Alquié
{"title":"Challenges for a new integrated ultra-wideband (UWB) source","authors":"A. Azakkour, M. Regis, F. Pourchet, G. Alquié","doi":"10.1109/UWBST.2003.1267879","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267879","url":null,"abstract":"This paper presents a description of a new method to generate a short impulse based on a counter designed on BiCMOS SiGe technology. This architecture includes a new method to modify the PRF (pulse repetition frequency) by changing the counter division ratio and an easy way to control the impulse frequency center. A pseudo-noise sequence prescaler modulates the impulses with specific modulation schemes, such as pulse position, bi-phase modulation or a combination of both. The total power consumption is 65 mA at 7GHz.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"31 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123521325","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: 9
Novel two dimensional complementary sequences in ultra wideband wireless communications 超宽带无线通信中的新型二维互补序列
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-16 DOI: 10.1109/UWBST.2003.1267872
Chao Zhang, Xiaokang Lin, M. Hatori
{"title":"Novel two dimensional complementary sequences in ultra wideband wireless communications","authors":"Chao Zhang, Xiaokang Lin, M. Hatori","doi":"10.1109/UWBST.2003.1267872","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267872","url":null,"abstract":"In ultra wide band (UWB) wireless communications, multicarrier CDMA has been considered as a combination of CDMA and OFDM. However, even until now, the efficient CDMA scheme suitable for OFDM signal composed of a set of orthogonal subcarriers is still under study and searching. In this paper, we present a novel \"two dimensional complementary sequence\" (TDC) and its application in MC-CDMA system. Meanwhile, an algorithm to construct this sequence has been built up. It has been proved that the new scheme can offer a low PAR value (within 3 dB) as well as high bandwidth efficiency and high transmission.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128412952","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: 13
Pulse delay techniques for PPM impulse radio transmitters PPM脉冲无线电发射机的脉冲延迟技术
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-16 DOI: 10.1109/UWBST.2003.1267798
T. Buchegger, G. Oßberger, A. Reisenzahn, A. Stelzer, A. Springer
{"title":"Pulse delay techniques for PPM impulse radio transmitters","authors":"T. Buchegger, G. Oßberger, A. Reisenzahn, A. Stelzer, A. Springer","doi":"10.1109/UWBST.2003.1267798","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267798","url":null,"abstract":"A great challenge in impulse radio pulse position modulation (PPM) is a simple time delay control for the modulated pulses. Two transmitter prototypes for UWB pulse generation will be presented. The first is a step recovery diode (SRD) based pulser, where the time position of the pulse is controlled by a variable current source. The second circuit shifts the pulse in time by varying the operating point of an avalanche transistor. The shape of the pulse equals higher derivatives of the Gaussian pulse for both circuits in assistance with a high pass filter.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129734490","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
Suitability of some propagation models to analyse interference from ultra wideband transmitters in outdoor environments 一些传播模型在室外环境下分析超宽带发射机干扰的适用性
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-16 DOI: 10.1109/UWBST.2003.1267890
Q. Zeng
{"title":"Suitability of some propagation models to analyse interference from ultra wideband transmitters in outdoor environments","authors":"Q. Zeng","doi":"10.1109/UWBST.2003.1267890","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267890","url":null,"abstract":"In this paper, with five propagation models, a statistical analysis of interference from randomly located ultra wideband (UWB) emitters is conducted. The suitability and limitations of these propagation models on the basis of the results obtained are discussed. Some meaningful conclusions, which are important to design and regulate UWB systems, are drawn.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669632","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 multi-band OFDM system for UWB communication 用于超宽带通信的多频带OFDM系统
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-16 DOI: 10.1109/UWBST.2003.1267863
J. Balakrishnan, A. Batra, Anand G. Dabak
{"title":"A multi-band OFDM system for UWB communication","authors":"J. Balakrishnan, A. Batra, Anand G. Dabak","doi":"10.1109/UWBST.2003.1267863","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267863","url":null,"abstract":"In this paper, a multi-band OFDM system for ultra-wideband communication (UWB) is described. In this system, the UWB spectrum is divided into bands that are 528 MHz wide and the data is transmitted across the bands using a time-frequency code. Within each sub-band, an OFDM modulation scheme is used to convey the information. An overview of the multi-band OFDM system and various system design trade-offs are discussed within this paper. In addition, bit precision requirements, power consumption estimates and performance results in realistic multi-path environments are provided for the multi-band OFDM system.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116715761","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: 186
Bottom fed planar elliptical UWB antennas 底馈平面椭圆超宽带天线
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-16 DOI: 10.1109/UWBST.2003.1267836
H. Schantz
{"title":"Bottom fed planar elliptical UWB antennas","authors":"H. Schantz","doi":"10.1109/UWBST.2003.1267836","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267836","url":null,"abstract":"This paper describes the \"bottom fed\" planar elliptical dipoles. These antennas are electrically small ultra-wideband (UWB) dipoles with bandwidths on the order of 3:1 or better. Return loss is typically -14 dB, and boresight gain is nominally 3 Bi. Bottom fed planar elliptical dipole antennas are well suited for commercial applications.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132844294","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: 120
Design and performance analysis of UWB TH-MA scheme using multi-code based PPM 基于多码PPM的超宽带天籁调频方案设计与性能分析
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-11-01 DOI: 10.1109/UWBST.2003.1267885
Sung-Yoon Jung, Dong-Jo Park, Yeong-Hyeon Kwon, Sang-Min Lee
{"title":"Design and performance analysis of UWB TH-MA scheme using multi-code based PPM","authors":"Sung-Yoon Jung, Dong-Jo Park, Yeong-Hyeon Kwon, Sang-Min Lee","doi":"10.1109/UWBST.2003.1267885","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267885","url":null,"abstract":"In this paper, we propose an UWB time-hopping multiple-access (TH-MA) scheme using multi-code based PPM. The multi-code signal, which is generated by spreading the desired user's M transmitting bits with M orthogonal codes, is pulse-position modulated. At the receiver, the received signal is demodulated through two stages. In the first stage, the multi-code based PPM signal is demodulated through the Bayes decision rule. Then, in the second stage, the demodulated multi-code signal is de-spreaded by using the M orthogonal spreading codes that are used in the transmitter. The BER performance and bit transmission rate (R/sub b/) of the proposed scheme is analyzed. Numerical results show that the proposed scheme has a much higher bit transmission rate than the conventional PPM scheme as M increases and also has better BER performance than the conventional PPM scheme in the same bit transmission case because it can achieve an additional spreading gain.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"81 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113967305","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
Spotforming with an array of ultra-wideband radio transmitters 用一组超宽带无线电发射机形成斑点
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 2003-09-29 DOI: 10.1109/UWBST.2003.1267826
F. Dowla, A. Spiridon
{"title":"Spotforming with an array of ultra-wideband radio transmitters","authors":"F. Dowla, A. Spiridon","doi":"10.1109/UWBST.2003.1267826","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267826","url":null,"abstract":"Ultra-wideband (UWB) array signal processing has the distinct advantage in that it is possible to illuminate or focus on \"spots\" at distant points in space, as opposed to just illuminating or steering at certain directions for narrowband array processing. The term \"spotforming\" is used to emphasize the property that point-focusing techniques with UWB waveforms can be viewed as a generalization of the well-known narrowband beamforming techniques. Because methods in spotforming can lead to powerful applications for UWB systems, in this paper we derive, simulate and experimentally verify UWB spot size as a function of frequency, bandwidth and array aperture.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134366925","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
Combined iterative demapping and decoding for coded UWB-IR systems 编码UWB-IR系统的组合迭代解映射与解码
IEEE Conference on Ultra Wideband Systems and Technologies, 2003 Pub Date : 1900-01-01 DOI: 10.1109/UWBST.2003.1267877
K. Takizawa, R. Kohno
{"title":"Combined iterative demapping and decoding for coded UWB-IR systems","authors":"K. Takizawa, R. Kohno","doi":"10.1109/UWBST.2003.1267877","DOIUrl":"https://doi.org/10.1109/UWBST.2003.1267877","url":null,"abstract":"This paper presents a novel decoding strategy, called combined iterative demapping/decoding (CIDD), for coded ultra wideband impulse radio (UWB-IR) systems. From the viewpoint of coding, coded UWB-IR systems can be viewed as a class of serially concatenated coding, because channel encoder and pulse mapper in the UWB-IR systems plays a role of outer and inner encoder in serial concatenated coding, respectively. For serially concatenated coding, it is well known that iterative decoding between the inner and outer decoder brings additional coding gain by using a soft-in/soft-out (SISO) decoding algorithm. In this paper, we derive a SISO algorithm for pulse demapper based on a max log-maximum a posteriori probability (MAP) algorithm to make the CIDD applicable, and then we show that this CIDD strategy improves the error rate performance with a reasonable complexity from simulation results. By applying the CIDD, larger coding gain is achieved with less computational complexity than turbo coded systems.","PeriodicalId":218975,"journal":{"name":"IEEE Conference on Ultra Wideband Systems and Technologies, 2003","volume":"70 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124107999","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
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