Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434199
K. Ohta, K. Ono, I. Matsunami, A. Kajiwara
Ultra-wideband impulse-radio (UWB-IR) has lately attracted considerable attention because of high range-resolution, penetration against blanket and clothes, low power spectral emission and so on. In medical care or geriatric health care facilities, therefore it is expected to detect the small movement of a resident such as breathing with a remote non-contact approach which is unique as compared with conventional sensors such as infra-red and narrow-band radio. This paper suggests a wireless motion sensor using UWB-IR, which detects various movements of a resident vacating a bedside, room or designated area. It can also monitor the resident's respiration rate in bed. In this paper the measurement was conducted for several scenarios and the usefulness is investigated. As a result, it is found to be useful for ant-wandering and respiratory monitoring.
{"title":"Wireless motion sensor using ultra-wideband impulse-radio","authors":"K. Ohta, K. Ono, I. Matsunami, A. Kajiwara","doi":"10.1109/RWS.2010.5434199","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434199","url":null,"abstract":"Ultra-wideband impulse-radio (UWB-IR) has lately attracted considerable attention because of high range-resolution, penetration against blanket and clothes, low power spectral emission and so on. In medical care or geriatric health care facilities, therefore it is expected to detect the small movement of a resident such as breathing with a remote non-contact approach which is unique as compared with conventional sensors such as infra-red and narrow-band radio. This paper suggests a wireless motion sensor using UWB-IR, which detects various movements of a resident vacating a bedside, room or designated area. It can also monitor the resident's respiration rate in bed. In this paper the measurement was conducted for several scenarios and the usefulness is investigated. As a result, it is found to be useful for ant-wandering and respiratory monitoring.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121733093","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434222
A. Katz, Brian Eggleston, D. McGee, J. MacDonald
A new UHF Solid State Power Amplifier (SSPA) has been developed for use in government mobile communications space programs. Predistortion linearization combined with high-voltage gallium nitride (GaN) FET technology allows the simultaneous achievement of both linearity and record high linear efficiency. This SSPA is capable of a peak power of more than 170 watts, but will be operated at a lower power (60 watts) to provide the reliability required for service in space and the linearity needed for WCDMA operation. A power added efficiency (PAE) of greater than 60 % was achieved at this operating point.
{"title":"UHF GaN SSPA for space applications","authors":"A. Katz, Brian Eggleston, D. McGee, J. MacDonald","doi":"10.1109/RWS.2010.5434222","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434222","url":null,"abstract":"A new UHF Solid State Power Amplifier (SSPA) has been developed for use in government mobile communications space programs. Predistortion linearization combined with high-voltage gallium nitride (GaN) FET technology allows the simultaneous achievement of both linearity and record high linear efficiency. This SSPA is capable of a peak power of more than 170 watts, but will be operated at a lower power (60 watts) to provide the reliability required for service in space and the linearity needed for WCDMA operation. A power added efficiency (PAE) of greater than 60 % was achieved at this operating point.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125395242","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434168
J. Hoversten, Z. Popovic
A general envelope tracking (ET) transmitter is described which utilizes both drive and drain modulation. We develop a simulation method useful for modeling the impact of component non-idealities on system performance, starting from hardware measurement data. An example analysis evaluates tradeoffs between ET system linearity, power amplifier efficiency, and envelope modulator requirements for a W-CDMA down-link transmitter.
{"title":"Envelope tracking transmitter system analysis method","authors":"J. Hoversten, Z. Popovic","doi":"10.1109/RWS.2010.5434168","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434168","url":null,"abstract":"A general envelope tracking (ET) transmitter is described which utilizes both drive and drain modulation. We develop a simulation method useful for modeling the impact of component non-idealities on system performance, starting from hardware measurement data. An example analysis evaluates tradeoffs between ET system linearity, power amplifier efficiency, and envelope modulator requirements for a W-CDMA down-link transmitter.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131132335","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434157
J. Zeleny, P. Rosson, C. Dehos, A. Kaiser
In this paper, a digital algorithm is proposed for the compensation of base station power amplifier nonlinearity for 802.16j very high data rate systems. The compensation takes place into the relay station receiver, which reduce the overall network power consumption. Simulation results show good performance enhancement, while an experimental test bed achieves the proof of concept on WIMAX signal.
{"title":"Digital compensation of the power amplifier nonlinearities at relay station receivers in 802.16j very high data rate systems","authors":"J. Zeleny, P. Rosson, C. Dehos, A. Kaiser","doi":"10.1109/RWS.2010.5434157","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434157","url":null,"abstract":"In this paper, a digital algorithm is proposed for the compensation of base station power amplifier nonlinearity for 802.16j very high data rate systems. The compensation takes place into the relay station receiver, which reduce the overall network power consumption. Simulation results show good performance enhancement, while an experimental test bed achieves the proof of concept on WIMAX signal.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128820291","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434139
J. Taylor, Z. Low, J. Casanova, Jenshan Lin
A wireless power system via magnetic induction that can deliver 32 W to a laptop is designed and fabricated. A 60% peak end-to-end regulated efficiency is achieved. A load detection scheme is also implemented, which detects when a device is placed on the transmitter and can shut down the system if faults are detected. The system eliminates the need to plug the laptop into AC power when running or charging.
{"title":"A wireless power station for laptop computers","authors":"J. Taylor, Z. Low, J. Casanova, Jenshan Lin","doi":"10.1109/RWS.2010.5434139","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434139","url":null,"abstract":"A wireless power system via magnetic induction that can deliver 32 W to a laptop is designed and fabricated. A 60% peak end-to-end regulated efficiency is achieved. A load detection scheme is also implemented, which detects when a device is placed on the transmitter and can shut down the system if faults are detected. The system eliminates the need to plug the laptop into AC power when running or charging.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116039710","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434208
D. Yamane, Winston Sun, H. Fujita, H. Toshiyoshi, S. Kawasaki
This paper presents the design, fabrication method and measurement results on a low-loss Ohmic-contact RF-MEMS switch with a bi-lateral actuation for a Dual-SPDT switching system. The switch was fabricated based on the silicon bulk-micromachining technology and a layer-wise technique on an SOI wafer. We demonstrated a compatibility with electroplating and high aspect-ratio Deep-RIE process to have loss-less quasi-air-suspended MEMS waveguides and adequately thick gold layer for side-wall ohmic contact. Typical performance shows 0.56 dB insertion loss, 19.4 dB return loss and 51.4 dB isolation at the Ku-band frequency of 12 GHz.
{"title":"Development of a Dual-SPDT RF-MEMS switch for Ku-band","authors":"D. Yamane, Winston Sun, H. Fujita, H. Toshiyoshi, S. Kawasaki","doi":"10.1109/RWS.2010.5434208","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434208","url":null,"abstract":"This paper presents the design, fabrication method and measurement results on a low-loss Ohmic-contact RF-MEMS switch with a bi-lateral actuation for a Dual-SPDT switching system. The switch was fabricated based on the silicon bulk-micromachining technology and a layer-wise technique on an SOI wafer. We demonstrated a compatibility with electroplating and high aspect-ratio Deep-RIE process to have loss-less quasi-air-suspended MEMS waveguides and adequately thick gold layer for side-wall ohmic contact. Typical performance shows 0.56 dB insertion loss, 19.4 dB return loss and 51.4 dB isolation at the Ku-band frequency of 12 GHz.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122586863","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434190
I. Mostafanezhad, O. Boric-Lubecke, V. Lubecke
Continuous Wave Doppler radar has been used in human life signs monitoring from a distance. Such systems are basically motion detectors that rely on phase modulation of the radar's reflected signal due to physiological motion which is of a low frequency nature and has significant signal content close to DC. Homodyne receiver architecture is simple, but has its own limitations including DC offset and contribution of low frequency noise from mixers and baseband amplifiers. A coherent low IF architecture has been proposed for this case to improve the performance. It will be shown that SNR is improved using a simple coherent low IF configuration. This is the first reported coherent low IF transceiver architecture for Doppler radar motion sensing.
{"title":"A coherent low IF receiver architecture for Doppler radar motion detector used in life signs monitoring","authors":"I. Mostafanezhad, O. Boric-Lubecke, V. Lubecke","doi":"10.1109/RWS.2010.5434190","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434190","url":null,"abstract":"Continuous Wave Doppler radar has been used in human life signs monitoring from a distance. Such systems are basically motion detectors that rely on phase modulation of the radar's reflected signal due to physiological motion which is of a low frequency nature and has significant signal content close to DC. Homodyne receiver architecture is simple, but has its own limitations including DC offset and contribution of low frequency noise from mixers and baseband amplifiers. A coherent low IF architecture has been proposed for this case to improve the performance. It will be shown that SNR is improved using a simple coherent low IF configuration. This is the first reported coherent low IF transceiver architecture for Doppler radar motion sensing.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121101808","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434185
N. Constantin, M. El-Gamal
This paper presents an equations based approach for estimating the linearity requirements for the RF envelope detectors and the other circuit blocks typically found in the error signal path of an envelope feedback amplifier. The proposed equations are based on a three-tone excitation and a 5th degree power series representation of the nonlinearities in the RF power amplifier block, which allows estimating inter-modulation distortion within the feedback system using peak-to-average envelope voltage ratios that may be parameterized. The proposed approach for validating and optimizing the linearity performances of the envelope detectors in open loop conditions, as a function of feedback parameters and closed loop IMD goals, can be used to analyze envelope feedback systems during the design phase, and may be particularly helpful for circuit characterization independently of the simulation environment.
{"title":"A method for estimating the IMD performance requirements of circuit blocks in the error signal path of an envelope feedback amplifier","authors":"N. Constantin, M. El-Gamal","doi":"10.1109/RWS.2010.5434185","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434185","url":null,"abstract":"This paper presents an equations based approach for estimating the linearity requirements for the RF envelope detectors and the other circuit blocks typically found in the error signal path of an envelope feedback amplifier. The proposed equations are based on a three-tone excitation and a 5th degree power series representation of the nonlinearities in the RF power amplifier block, which allows estimating inter-modulation distortion within the feedback system using peak-to-average envelope voltage ratios that may be parameterized. The proposed approach for validating and optimizing the linearity performances of the envelope detectors in open loop conditions, as a function of feedback parameters and closed loop IMD goals, can be used to analyze envelope feedback systems during the design phase, and may be particularly helpful for circuit characterization independently of the simulation environment.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121514924","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434209
C. Hale, R. Baeten
This paper presents a 1mm2 Cu pillar flip chip SP3T/LNA RFIC targeted for use in 802.11b/g front-ends. The SP3T switch enables WLAN transmit/receive and Bluetooth modes of operation. This switch exhibits 0.6dB insertion loss per branch and delivers 802.11g linear performance up to +21dBm output power. A single-stage LNA with a bypass mode is connected after the WLAN Rx branch to increase overall receiver sensitivity and dynamic range. The LNA achieved 1.9dB NF with a typical 11.5dB small-signal gain, including the switch loss. This die occupies only 25% of the footprint of similar existing QFN style WLAN front ends.
{"title":"A 1mm2 flip-chip SP3T switch and low noise amplifier RFIC FEM for 802.11b/g applications","authors":"C. Hale, R. Baeten","doi":"10.1109/RWS.2010.5434209","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434209","url":null,"abstract":"This paper presents a 1mm2 Cu pillar flip chip SP3T/LNA RFIC targeted for use in 802.11b/g front-ends. The SP3T switch enables WLAN transmit/receive and Bluetooth modes of operation. This switch exhibits 0.6dB insertion loss per branch and delivers 802.11g linear performance up to +21dBm output power. A single-stage LNA with a bypass mode is connected after the WLAN Rx branch to increase overall receiver sensitivity and dynamic range. The LNA achieved 1.9dB NF with a typical 11.5dB small-signal gain, including the switch loss. This die occupies only 25% of the footprint of similar existing QFN style WLAN front ends.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127345014","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 : 2010-01-10DOI: 10.1109/RWS.2010.5434169
Hanwen Cao, C. Konig, A. Wilzeck, M.-D. Perez Guirao
Cognitive radio is a well motivated concept for improving the inefficient spectrum utilization and apparent scarcity that result from traditional spectral regulations. So far, most efforts in the cognitive radio research field focus on techniques for the enhancement of the amount of available spectrum under the stringent constraint of causing no harmful interference to legacy users. But communication reliability also can substantially benefit from the cognitive radio approach by means of agile utilization of transmission opportunities in frequency, time and space. In this paper, we present our Cognitive Agile Networking (CAN) framework that aims at achieving robust low-latency communications by introducing agility in frequency, time and space as well as learning and reasoning for optimizing network operations. In order to respect practical issues of real-world applications, we are building a Cognitive Agile Spectrum Testbed (COAST) for experiments and validations. An initial version of this testbed is introduced here and its spectral agility is demonstrated.
{"title":"Cognitive Agile Networking testbed","authors":"Hanwen Cao, C. Konig, A. Wilzeck, M.-D. Perez Guirao","doi":"10.1109/RWS.2010.5434169","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434169","url":null,"abstract":"Cognitive radio is a well motivated concept for improving the inefficient spectrum utilization and apparent scarcity that result from traditional spectral regulations. So far, most efforts in the cognitive radio research field focus on techniques for the enhancement of the amount of available spectrum under the stringent constraint of causing no harmful interference to legacy users. But communication reliability also can substantially benefit from the cognitive radio approach by means of agile utilization of transmission opportunities in frequency, time and space. In this paper, we present our Cognitive Agile Networking (CAN) framework that aims at achieving robust low-latency communications by introducing agility in frequency, time and space as well as learning and reasoning for optimizing network operations. In order to respect practical issues of real-world applications, we are building a Cognitive Agile Spectrum Testbed (COAST) for experiments and validations. An initial version of this testbed is introduced here and its spectral agility is demonstrated.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132411100","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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