Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058869
L. Mucchi, E. Del Re, T. Landi
Current wireless communication systems strongly need to know if a line-of-sight (LOS) path is present between transmitter and receiver. The next generation of wireless systems will require more than the simple distinction between a LOS and a non-LOS (NLOS) link condition. The future short-range wireless communication and localization systems will require an exact environment identification in order to better set up all the services which the users require with a specific quality level. In this paper a new method for environment identification is proposed. This method is able to identify not only the LOS/NLOS condition but also the environment typology, i.e., if the propagation condition is typical of an office or a residential or an industrial area or outdoor, etc. If the environment in which the transmitter and the receiver are immersed is known, two main advantages can be reached: first, the localization of all the users is more accurate and, secondly, each receiver can be correctly configured in order to best adapt to the propagation conditions (cognitive approach) or to the network conditions (cooperative approach). Unlike the techniques discussed in the literature, the one proposed in this paper does not require any estimation, such as the estimation of the channel parameters. The method proposed here is based on statistical processing of the raw received probe UWB signal.
{"title":"Multi-level environment identification method for impulsive radio systems","authors":"L. Mucchi, E. Del Re, T. Landi","doi":"10.1109/ICUWB.2011.6058869","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058869","url":null,"abstract":"Current wireless communication systems strongly need to know if a line-of-sight (LOS) path is present between transmitter and receiver. The next generation of wireless systems will require more than the simple distinction between a LOS and a non-LOS (NLOS) link condition. The future short-range wireless communication and localization systems will require an exact environment identification in order to better set up all the services which the users require with a specific quality level. In this paper a new method for environment identification is proposed. This method is able to identify not only the LOS/NLOS condition but also the environment typology, i.e., if the propagation condition is typical of an office or a residential or an industrial area or outdoor, etc. If the environment in which the transmitter and the receiver are immersed is known, two main advantages can be reached: first, the localization of all the users is more accurate and, secondly, each receiver can be correctly configured in order to best adapt to the propagation conditions (cognitive approach) or to the network conditions (cooperative approach). Unlike the techniques discussed in the literature, the one proposed in this paper does not require any estimation, such as the estimation of the channel parameters. The method proposed here is based on statistical processing of the raw received probe UWB signal.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131785978","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058831
A. Batgerel, S. Eom, L. Minz, J. Kim, Jae-Ick Choi
In this paper, we propose a new bidirectional stacked microstrip dipole antenna with a multilayered disk array structure (MDAS) for a high gain WLAN application. In the proposed structure, two identical MDAS are attached on the both sides of a dipole exciter which is composed of two linearly polarized stacked microstrip patches placed back to back and fed with balanced input power using unbalanced-to-balanced (balun) transformer. The proposed antenna structure where MDAS has overall height of 1λ0 was designed and fabricated to operate at 2.44GHz. The maximum gain of the antenna was found to be 10.29dBi with highly symmetric bidirectional beam pattern in both E- and H-plane.
{"title":"High gain bidirectional microstrip dipole antenna","authors":"A. Batgerel, S. Eom, L. Minz, J. Kim, Jae-Ick Choi","doi":"10.1109/ICUWB.2011.6058831","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058831","url":null,"abstract":"In this paper, we propose a new bidirectional stacked microstrip dipole antenna with a multilayered disk array structure (MDAS) for a high gain WLAN application. In the proposed structure, two identical MDAS are attached on the both sides of a dipole exciter which is composed of two linearly polarized stacked microstrip patches placed back to back and fed with balanced input power using unbalanced-to-balanced (balun) transformer. The proposed antenna structure where MDAS has overall height of 1λ0 was designed and fabricated to operate at 2.44GHz. The maximum gain of the antenna was found to be 10.29dBi with highly symmetric bidirectional beam pattern in both E- and H-plane.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122990003","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058808
Andreas Schenk, R. Fischer
Building upon recent approaches for detection of impulse-radio ultra-wideband (IR-UWB) based on compressed sensing (CS), we combine this approach with techniques known from advanced autocorrelation-based detection of IR-UWB. Thereby, we avoid the respective drawbacks, in particular analog delay lines and complex algorithms for the reconstruction, thus, retain the low hardware complexity of CS-based detection and the low computational complexity of autocorrelation-based detection. We give an analytical analysis of CS-based differential detection and extend this scheme following the principle of decision-feedback differential detection. By means of numerical simulations, we prove that this approach enables to design low-complexity, yet power-efficient receivers for realistic IR-UWB scenarios.
{"title":"Compressed-sensing (decision-feedback) differential detection in impulse-radio ultra-wideband systems","authors":"Andreas Schenk, R. Fischer","doi":"10.1109/ICUWB.2011.6058808","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058808","url":null,"abstract":"Building upon recent approaches for detection of impulse-radio ultra-wideband (IR-UWB) based on compressed sensing (CS), we combine this approach with techniques known from advanced autocorrelation-based detection of IR-UWB. Thereby, we avoid the respective drawbacks, in particular analog delay lines and complex algorithms for the reconstruction, thus, retain the low hardware complexity of CS-based detection and the low computational complexity of autocorrelation-based detection. We give an analytical analysis of CS-based differential detection and extend this scheme following the principle of decision-feedback differential detection. By means of numerical simulations, we prove that this approach enables to design low-complexity, yet power-efficient receivers for realistic IR-UWB scenarios.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124541683","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058853
Antonio Nachira, G. Mazzini
This paper describes a model for calculating the value of spectrum used for bidirectional communications and applies it to calculate the value of spectrum allocated to 3G mobile communications and WiMAX. Then the calculated values are compared with the results of some recent auctions for the same bands to check their validity. An analysis is then made.
{"title":"The value of the radio spectrum: a comparison between theory and auctions","authors":"Antonio Nachira, G. Mazzini","doi":"10.1109/ICUWB.2011.6058853","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058853","url":null,"abstract":"This paper describes a model for calculating the value of spectrum used for bidirectional communications and applies it to calculate the value of spectrum allocated to 3G mobile communications and WiMAX. Then the calculated values are compared with the results of some recent auctions for the same bands to check their validity. An analysis is then made.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121227495","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058850
Zhiwei Lin, Xiaoming Peng, F. Chin
Beamforming is one of the key technique for 60GHz wireless system to work at this millimeter-wave region with high propagation path loss. In IEEE 802.15.3c standard, a codebook based analog beamforming mechanism is adopted for its simplicity and feasibility. However, this simple beam sweep mechanism may not work properly in the presence of Co-Channel Interference (CCI) when dense spatial reuse is required. In this paper, an enhanced beamforming technique is proposed with mixed analog and digital beamforming structure for 60GHz Orthogonal Frequency Division Multiplexing (OFDM) system. Beam sweep mechanism with such as codebook based phased antenna array can be applied to analog beamforming for its hardware simplicity. On the other hand, more than one RF chains can be introduced to enable adaptive digital beamforming for improved performance and robustness. A Minimum Mean Square Error (MMSE) based switched beam or beamforming codeword selection algorithm is proposed for this mixed analog/digital beamforming structure to achieve enhanced interference mitigation and spatial reuse capability in the presence of CCI.
{"title":"Enhanced beamforming for 60GHz OFDM system with co-channel interference mitigation","authors":"Zhiwei Lin, Xiaoming Peng, F. Chin","doi":"10.1109/ICUWB.2011.6058850","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058850","url":null,"abstract":"Beamforming is one of the key technique for 60GHz wireless system to work at this millimeter-wave region with high propagation path loss. In IEEE 802.15.3c standard, a codebook based analog beamforming mechanism is adopted for its simplicity and feasibility. However, this simple beam sweep mechanism may not work properly in the presence of Co-Channel Interference (CCI) when dense spatial reuse is required. In this paper, an enhanced beamforming technique is proposed with mixed analog and digital beamforming structure for 60GHz Orthogonal Frequency Division Multiplexing (OFDM) system. Beam sweep mechanism with such as codebook based phased antenna array can be applied to analog beamforming for its hardware simplicity. On the other hand, more than one RF chains can be introduced to enable adaptive digital beamforming for improved performance and robustness. A Minimum Mean Square Error (MMSE) based switched beam or beamforming codeword selection algorithm is proposed for this mixed analog/digital beamforming structure to achieve enhanced interference mitigation and spatial reuse capability in the presence of CCI.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116789904","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058892
V. Heiries, K. Belmkaddem, F. Dehmas, B. Denis, L. Ouvry, R. D’Errico
In this paper we present the performance evaluation of an Ultra Wide Band (UWB) radio-frequency identification (RFID) system for ranging and tracking of passive tags. A UWB channel model is derived from antenna backscattering measurements. A specific physical layer is proposed. Based on this channel model and physical layer, a performance analysis is carried out through realistic simulations on both TOA estimations and tag location tracking.
{"title":"UWB backscattering system for passive RFID tag ranging and tracking","authors":"V. Heiries, K. Belmkaddem, F. Dehmas, B. Denis, L. Ouvry, R. D’Errico","doi":"10.1109/ICUWB.2011.6058892","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058892","url":null,"abstract":"In this paper we present the performance evaluation of an Ultra Wide Band (UWB) radio-frequency identification (RFID) system for ranging and tracking of passive tags. A UWB channel model is derived from antenna backscattering measurements. A specific physical layer is proposed. Based on this channel model and physical layer, a performance analysis is carried out through realistic simulations on both TOA estimations and tag location tracking.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117032237","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058823
J. Chóliz, Á. Hernández-Solana, A. Valdovinos, A. Sierra
In the last few decades, the proliferation of fixed and mobile access technologies and networks has provided the network operators with a large choice to offer a variety of services. Different radio technologies complement each other and offer different data rates and coverage for different service requirements. In this context, Ultra-Wideband (UWB) arises as a potential access technology providing very high data rate access in short-range picocells. This paper analyses the possible use of WiMedia UWB as a network access technology. UWB capabilities are assessed and compared to other radio access technologies, i.e. 802.11, in terms of data rate and achievable throughput. WiMedia UWB overhead is studied in order to evaluate the throughput and experimental results with both development kits and commercial devices are also included that confirm theoretical results.
{"title":"UWB as a network access technology in picocells","authors":"J. Chóliz, Á. Hernández-Solana, A. Valdovinos, A. Sierra","doi":"10.1109/ICUWB.2011.6058823","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058823","url":null,"abstract":"In the last few decades, the proliferation of fixed and mobile access technologies and networks has provided the network operators with a large choice to offer a variety of services. Different radio technologies complement each other and offer different data rates and coverage for different service requirements. In this context, Ultra-Wideband (UWB) arises as a potential access technology providing very high data rate access in short-range picocells. This paper analyses the possible use of WiMedia UWB as a network access technology. UWB capabilities are assessed and compared to other radio access technologies, i.e. 802.11, in terms of data rate and achievable throughput. WiMedia UWB overhead is studied in order to evaluate the throughput and experimental results with both development kits and commercial devices are also included that confirm theoretical results.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125460926","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058901
Wesley M. Gifford, W. W. Li, Y. Zhang, M. Win
The design of efficient wideband diversity systems and their accurate performance evaluation depends on a complete understanding of the number of multipath components, referred to as the multipath order, available in the communication channel. This paper characterizes the multipath order based on captured channel realizations from a comprehensive indoor measurement campaign performed on the MIT campus. The multipath orders are extracted from channel realizations observed at a set of center frequency and bandwidth pairs in a variety of locations. It is shown that changes in bandwidth significantly impact the multipath order, and in general the behavior is nonlinear. We first propose separate models which are only a function of bandwidth, for each center frequency. Then we develop a more general joint model which takes into account the variations caused by changes in both center frequency and bandwidth. These models are validated through statistical tests and are shown to accurately characterize the multipath order.
{"title":"On the multipath order in wideband indoor propagation environments","authors":"Wesley M. Gifford, W. W. Li, Y. Zhang, M. Win","doi":"10.1109/ICUWB.2011.6058901","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058901","url":null,"abstract":"The design of efficient wideband diversity systems and their accurate performance evaluation depends on a complete understanding of the number of multipath components, referred to as the multipath order, available in the communication channel. This paper characterizes the multipath order based on captured channel realizations from a comprehensive indoor measurement campaign performed on the MIT campus. The multipath orders are extracted from channel realizations observed at a set of center frequency and bandwidth pairs in a variety of locations. It is shown that changes in bandwidth significantly impact the multipath order, and in general the behavior is nonlinear. We first propose separate models which are only a function of bandwidth, for each center frequency. Then we develop a more general joint model which takes into account the variations caused by changes in both center frequency and bandwidth. These models are validated through statistical tests and are shown to accurately characterize the multipath order.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125962502","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058928
Francesco Montorsi, F. Pancaldi, G. Vitetta
In this paper some new experimental results about the statistical characterization of the non-line-of-sight (NLOS) bias affecting time-of-arrival (TOA) estimation in ultrawideband (UWB) wireless localization systems are illustrated. Then, these results are exploited to assess the performance of various maximum-likelihood (ML) based algorithms for joint TOA localization and NLOS bias mitigation. Our numerical results evidence that the accuracy of all the considered algorithms is appreciably influenced by the LOS/NLOS conditions of the propagation environment.
{"title":"Statistical characterization and mitigation of NLOS errors in UWB localization systems","authors":"Francesco Montorsi, F. Pancaldi, G. Vitetta","doi":"10.1109/ICUWB.2011.6058928","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058928","url":null,"abstract":"In this paper some new experimental results about the statistical characterization of the non-line-of-sight (NLOS) bias affecting time-of-arrival (TOA) estimation in ultrawideband (UWB) wireless localization systems are illustrated. Then, these results are exploited to assess the performance of various maximum-likelihood (ML) based algorithms for joint TOA localization and NLOS bias mitigation. Our numerical results evidence that the accuracy of all the considered algorithms is appreciably influenced by the LOS/NLOS conditions of the propagation environment.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126048727","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 : 2011-10-24DOI: 10.1109/ICUWB.2011.6058931
Moon-kyoung Kang, Jimyng Kang, Soonwoo Lee, Youngjin Park, Kwan-Ho Kim
This paper proposes a method for mitigation of non-line-of-sight (NLOS) situations in a real time location system (RTLS) using an impulse radio ultra wide band (IR-UWB). Based on our experiment, we found that there is a slight chance to meet the line-of-sight (LOS) at all the readers of RTLS in a realistic scenario. In the NLOS environment, there are two problems of packet-miss error and multi-path error as well. To compensate for the packet-miss error, this paper presents a new algorithm (PPTi), which uses previous time information before the time difference of arrival (TDOA) positioning technique calculates the coordinate of the target. We also employed the Kalman Filter (KF) to mitigate multi-path error. Our proposed algorithm provides a 5.9% increased positioning success rate and a 25.6% decreased root mean square error (RMSE) in an NLOS environment.
{"title":"NLOS mitigation for low-cost IR-UWB RTLS","authors":"Moon-kyoung Kang, Jimyng Kang, Soonwoo Lee, Youngjin Park, Kwan-Ho Kim","doi":"10.1109/ICUWB.2011.6058931","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058931","url":null,"abstract":"This paper proposes a method for mitigation of non-line-of-sight (NLOS) situations in a real time location system (RTLS) using an impulse radio ultra wide band (IR-UWB). Based on our experiment, we found that there is a slight chance to meet the line-of-sight (LOS) at all the readers of RTLS in a realistic scenario. In the NLOS environment, there are two problems of packet-miss error and multi-path error as well. To compensate for the packet-miss error, this paper presents a new algorithm (PPTi), which uses previous time information before the time difference of arrival (TDOA) positioning technique calculates the coordinate of the target. We also employed the Kalman Filter (KF) to mitigate multi-path error. Our proposed algorithm provides a 5.9% increased positioning success rate and a 25.6% decreased root mean square error (RMSE) in an NLOS environment.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123586325","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：