Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267831
W. M. Lovelace, J. Townsend
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.
{"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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267879
A. Azakkour, M. Regis, F. Pourchet, G. Alquié
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.
{"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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267872
Chao Zhang, Xiaokang Lin, M. Hatori
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.
{"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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267798
T. Buchegger, G. Oßberger, A. Reisenzahn, A. Stelzer, A. Springer
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.
{"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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267890
Q. Zeng
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.
{"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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267863
J. Balakrishnan, A. Batra, Anand G. Dabak
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.
{"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}
Pub Date : 2003-11-16DOI: 10.1109/UWBST.2003.1267836
H. Schantz
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.
{"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}
Pub Date : 2003-11-01DOI: 10.1109/UWBST.2003.1267885
Sung-Yoon Jung, Dong-Jo Park, Yeong-Hyeon Kwon, Sang-Min Lee
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.
{"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}
Pub Date : 2003-09-29DOI: 10.1109/UWBST.2003.1267826
F. Dowla, A. Spiridon
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.
{"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}
Pub Date : 1900-01-01DOI: 10.1109/UWBST.2003.1267877
K. Takizawa, R. Kohno
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.
{"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}
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