Pub Date : 2011-03-10DOI: 10.1109/RWS.2011.5727976
R. Gómez‐García, J. Muñoz-Ferreras, M. Sánchez-Renedo
An approach to design microwave multi-band bandpass planar filters with an arbitrary number of passbands is proposed. It is based on the generalization of a previously-reported transversal filter structure to synthesize multi-band responses. This filter topology, by means of signal-interference techniques, allows frequency-selective transfer functions with multiple passbands separated by inter-band transmission zeros to be derived. Analytical equations and guidelines for the theoretical design of the described multi-band bandpass filter configuration are given. Moreover, its practical viability is verified through the construction and testing of a six-band bandpass microstrip prototype. To the authors' knowledge, no other filter solution with such a plurality of passbands has been experimentally proven to date.
{"title":"Microwave transversal six-band bandpass planar filter for multi-standard wireless applications","authors":"R. Gómez‐García, J. Muñoz-Ferreras, M. Sánchez-Renedo","doi":"10.1109/RWS.2011.5727976","DOIUrl":"https://doi.org/10.1109/RWS.2011.5727976","url":null,"abstract":"An approach to design microwave multi-band bandpass planar filters with an arbitrary number of passbands is proposed. It is based on the generalization of a previously-reported transversal filter structure to synthesize multi-band responses. This filter topology, by means of signal-interference techniques, allows frequency-selective transfer functions with multiple passbands separated by inter-band transmission zeros to be derived. Analytical equations and guidelines for the theoretical design of the described multi-band bandpass filter configuration are given. Moreover, its practical viability is verified through the construction and testing of a six-band bandpass microstrip prototype. To the authors' knowledge, no other filter solution with such a plurality of passbands has been experimentally proven to date.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115177432","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725489
Michael Mitchell, Frank Sposaro, Annie Wang, Gary S. Tyson
We introduce BEAT (Bio-Environmental Android Tracking), which provides methods for collecting, processing, and archiving one's daily vital and spatiotemporal statistics using off-the-shelf wireless devices and biologic and environmental sensors. BEAT can operate in a self-contained manner on a mobile device and analyze vital information in real time. It uses statistics such as heartbeat variance and range thresholds to issue alerts. Alerts are propagated in a tiered fashion, so that the end user and his/her social contacts have a chance to detect false alerts before contacting medical professionals. BEAT is built on the open Android platform to support a diverse class of mobile devices. The framework can be extended to a full-fledged personal health monitoring system by incorporating additional biosensor data such as blood pressure, glucose, and weight.
{"title":"BEAT: Bio-Environmental Android Tracking","authors":"Michael Mitchell, Frank Sposaro, Annie Wang, Gary S. Tyson","doi":"10.1109/RWS.2011.5725489","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725489","url":null,"abstract":"We introduce BEAT (Bio-Environmental Android Tracking), which provides methods for collecting, processing, and archiving one's daily vital and spatiotemporal statistics using off-the-shelf wireless devices and biologic and environmental sensors. BEAT can operate in a self-contained manner on a mobile device and analyze vital information in real time. It uses statistics such as heartbeat variance and range thresholds to issue alerts. Alerts are propagated in a tiered fashion, so that the end user and his/her social contacts have a chance to detect false alerts before contacting medical professionals. BEAT is built on the open Android platform to support a diverse class of mobile devices. The framework can be extended to a full-fledged personal health monitoring system by incorporating additional biosensor data such as blood pressure, glucose, and weight.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122093059","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725428
D. Lin, B. Schleicher, A. Trasser, H. Schumacher
In this paper a fully integrated, low power and differential ultra-wide band (UWB) impulse generator is presented. The proposed circuit uses an on-chip generated current spike to shortly switch on an LC oscillator. The configurable current spike width leads to a tunable duration of the generated impulses. The corresponding spectrum has a controllable 10 dB bandwidth thus fitting the spectral allocations in the USA, Europe and Japan. The realized circuit has a low power consumption of 6mW when targeting the FCC mask and of 10mW when targeting the ECC and Japanese masks at 100MHz output impulse repetition rate. This compact design occupies a chip size of 0.32 mm2 including bounding pads.
{"title":"Si/SiGe HBT UWB impulse generator tunable to FCC, ECC and Japanese spectral masks","authors":"D. Lin, B. Schleicher, A. Trasser, H. Schumacher","doi":"10.1109/RWS.2011.5725428","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725428","url":null,"abstract":"In this paper a fully integrated, low power and differential ultra-wide band (UWB) impulse generator is presented. The proposed circuit uses an on-chip generated current spike to shortly switch on an LC oscillator. The configurable current spike width leads to a tunable duration of the generated impulses. The corresponding spectrum has a controllable 10 dB bandwidth thus fitting the spectral allocations in the USA, Europe and Japan. The realized circuit has a low power consumption of 6mW when targeting the FCC mask and of 10mW when targeting the ECC and Japanese masks at 100MHz output impulse repetition rate. This compact design occupies a chip size of 0.32 mm2 including bounding pads.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129864810","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725508
Kevin Wanuga, P. Mookiah, K. Dandekar
The designation of the 3–10 GHz frequency band for ultra-wideband (UWB) communications has led to the emergence of competing standards designed to facilitate high data-rate personal area networks (PAN). In particular, the IEEE 802.15.3 standard provides a multi-band physical layer to use all of the wide bandwidth while avoiding the frequency selective fading common to UWB channels. None of the proposed UWB techniques make use of spectrum efficient multiple input multiple output (MIMO) techniques in part because the characteristics of MIMO UWB OFDM channels are not well understood. This paper presents the results of measurements that characterize the MIMO UWB OFDM wireless channel over the frequencies from 3–6 GHz. Analysis of these measurements demonstrates the clear benefit of incorporating MIMO techniques into UWB OFDM communications to increase network capacity and system reliability.
{"title":"Measurement of the MIMO UWB OFDM channel","authors":"Kevin Wanuga, P. Mookiah, K. Dandekar","doi":"10.1109/RWS.2011.5725508","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725508","url":null,"abstract":"The designation of the 3–10 GHz frequency band for ultra-wideband (UWB) communications has led to the emergence of competing standards designed to facilitate high data-rate personal area networks (PAN). In particular, the IEEE 802.15.3 standard provides a multi-band physical layer to use all of the wide bandwidth while avoiding the frequency selective fading common to UWB channels. None of the proposed UWB techniques make use of spectrum efficient multiple input multiple output (MIMO) techniques in part because the characteristics of MIMO UWB OFDM channels are not well understood. This paper presents the results of measurements that characterize the MIMO UWB OFDM wireless channel over the frequencies from 3–6 GHz. Analysis of these measurements demonstrates the clear benefit of incorporating MIMO techniques into UWB OFDM communications to increase network capacity and system reliability.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128602487","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725457
D. Uchida, T. Nagai, Y. Oshima, S. Wakana
A new probe with a micro-hole chip has been developed for measurement of near-field electrical radiation from printed circuit boards. The chip is fixed onto a semi-rigid cable probe facet and the radiated electric field is coupled with the surface of its inner conductor through an aperture with a diameter of 100 µm. Using a 50-µm-wide microstrip line for the device under test, we obtained a distance of 100 µm where the probe output decreases by 6 dB at a measurement height of 50 µm. This distance is in good agreement with our simulation results based on FDTD analysis. With a rectangular aperture of having a 50 µm width, we obtained a 72 µm distance at a 25 µm height. In addition, we confirmed that both the S21 characteristics of the measured line and the frequency characteristics of the probe can be dramatically improved by covering the outside of the probe with magnetic film.
{"title":"Novel high-spatial resolution probe for electric near-field measurement","authors":"D. Uchida, T. Nagai, Y. Oshima, S. Wakana","doi":"10.1109/RWS.2011.5725457","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725457","url":null,"abstract":"A new probe with a micro-hole chip has been developed for measurement of near-field electrical radiation from printed circuit boards. The chip is fixed onto a semi-rigid cable probe facet and the radiated electric field is coupled with the surface of its inner conductor through an aperture with a diameter of 100 µm. Using a 50-µm-wide microstrip line for the device under test, we obtained a distance of 100 µm where the probe output decreases by 6 dB at a measurement height of 50 µm. This distance is in good agreement with our simulation results based on FDTD analysis. With a rectangular aperture of having a 50 µm width, we obtained a 72 µm distance at a 25 µm height. In addition, we confirmed that both the S21 characteristics of the measured line and the frequency characteristics of the probe can be dramatically improved by covering the outside of the probe with magnetic film.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130395118","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725467
Cheng Cheng, K. Ishibashi, T. Wada
In this paper, we propose a simple network coded cooperation using non-binary modulation such as ternary phase shift keying (TPSK), which achieves high power and bandwidth efficiency compared with binary phase shift keying (BPSK). We investigate the encoder design based on serially concatenated convolutional codes (SCCC) and a simple network coding. Also, we study the appropriate decoders to exploit the proposed cooperative transmission. Numerical results show our proposal scheme can enjoy the full spatial diversity gain. Furthermore, the throughput performance of our proposed scheme is superior to that of conventional decoded-and-forward cooperation over block Rayleigh fading channels.
{"title":"Power-efficient network coded cooperation using non-binarily modulated relay","authors":"Cheng Cheng, K. Ishibashi, T. Wada","doi":"10.1109/RWS.2011.5725467","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725467","url":null,"abstract":"In this paper, we propose a simple network coded cooperation using non-binary modulation such as ternary phase shift keying (TPSK), which achieves high power and bandwidth efficiency compared with binary phase shift keying (BPSK). We investigate the encoder design based on serially concatenated convolutional codes (SCCC) and a simple network coding. Also, we study the appropriate decoders to exploit the proposed cooperative transmission. Numerical results show our proposal scheme can enjoy the full spatial diversity gain. Furthermore, the throughput performance of our proposed scheme is superior to that of conventional decoded-and-forward cooperation over block Rayleigh fading channels.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121307552","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725506
P. Vizi, S. Vanka, S. Srinivasa, M. Haenggi, Z. Gong
Cellular base stations typically orthogonalize downlink transmissions, although this approach is not always throughput-optimal. Indeed, it can be shown that removing the orthogonality constraint (as in Superposition Coding) can provide significant benefits in some scenarios. Based on this principle, we propose a scheduling algorithm for a two-user downlink that leverages the disparity in their respective channel qualities. By a judicious reallocation of the transmit power and bandwidth, this algorithm improves the throughput to both users vis-à-vis an orthogonal scheme. We design a software-defined radio platform to implement the scheduler and experimentally verify the gains promised by theory.
{"title":"Scheduling using Superposition Coding: Design and Software Radio implementation","authors":"P. Vizi, S. Vanka, S. Srinivasa, M. Haenggi, Z. Gong","doi":"10.1109/RWS.2011.5725506","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725506","url":null,"abstract":"Cellular base stations typically orthogonalize downlink transmissions, although this approach is not always throughput-optimal. Indeed, it can be shown that removing the orthogonality constraint (as in Superposition Coding) can provide significant benefits in some scenarios. Based on this principle, we propose a scheduling algorithm for a two-user downlink that leverages the disparity in their respective channel qualities. By a judicious reallocation of the transmit power and bandwidth, this algorithm improves the throughput to both users vis-à-vis an orthogonal scheme. We design a software-defined radio platform to implement the scheduler and experimentally verify the gains promised by theory.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116221264","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725472
Murat Karabacak, H. A. Çırpan, H. Arslan
In the design of software defined radio (SDR) and cognitive radio (CR), new and flexible digital baseband algorithms are required for generating and decoding a variety of waveforms. Especially, blind identification of the waveform parameters, modulation types, and synchronization parameters are extremely important. In this article, we propose a modulation identification algorithm in which no a priori information is assumed about the constellation map. The proposed algorithm can identify the modulation, even if short data record is available. Moreover, numerical results are provided to show the performance of the proposed approach under certain assumptions.
{"title":"An efficient modulation identification algorithm without constellation map knowledge","authors":"Murat Karabacak, H. A. Çırpan, H. Arslan","doi":"10.1109/RWS.2011.5725472","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725472","url":null,"abstract":"In the design of software defined radio (SDR) and cognitive radio (CR), new and flexible digital baseband algorithms are required for generating and decoding a variety of waveforms. Especially, blind identification of the waveform parameters, modulation types, and synchronization parameters are extremely important. In this article, we propose a modulation identification algorithm in which no a priori information is assumed about the constellation map. The proposed algorithm can identify the modulation, even if short data record is available. Moreover, numerical results are provided to show the performance of the proposed approach under certain assumptions.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128070713","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725412
Seon Ae Kim, D. An, H. Ryu, Jin-up Kim
It is very important to estimate the signal to noise ratio (SNR) of received signal and to transmit the signal effectively for the modern communication system. The performance of existing non-data-aided (NDA) SNR estimation methods are substantially degraded for high level modulation scheme such as M-ary amplitude and phase shift keying (APSK) or quadrature amplitude modulation (QAM). In this paper, we propose a SNR estimation method which uses zero point auto-correlation of received signal per block and auto/cross- correlation of decision feedback signal in orthogonal frequency division multiplexing (OFDM) system. Proposed method can be studied into two types; Type 1 can estimate SNR by zero point auto-correlation of decision feedback signal based on the second moment property. Type 2 uses both zero point auto-correlation and cross-correlation based on the fourth moment property. In block-by-block reception of OFDM system, these two SNR estimation methods can be possible for the practical implementation due to correlation based the estimation method and they show more stable estimation performance than the previous SNR estimation methods.
{"title":"Efficient SNR estimation in OFDM system","authors":"Seon Ae Kim, D. An, H. Ryu, Jin-up Kim","doi":"10.1109/RWS.2011.5725412","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725412","url":null,"abstract":"It is very important to estimate the signal to noise ratio (SNR) of received signal and to transmit the signal effectively for the modern communication system. The performance of existing non-data-aided (NDA) SNR estimation methods are substantially degraded for high level modulation scheme such as M-ary amplitude and phase shift keying (APSK) or quadrature amplitude modulation (QAM). In this paper, we propose a SNR estimation method which uses zero point auto-correlation of received signal per block and auto/cross- correlation of decision feedback signal in orthogonal frequency division multiplexing (OFDM) system. Proposed method can be studied into two types; Type 1 can estimate SNR by zero point auto-correlation of decision feedback signal based on the second moment property. Type 2 uses both zero point auto-correlation and cross-correlation based on the fourth moment property. In block-by-block reception of OFDM system, these two SNR estimation methods can be possible for the practical implementation due to correlation based the estimation method and they show more stable estimation performance than the previous SNR estimation methods.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127656828","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 : 2011-03-07DOI: 10.1109/RWS.2011.5725444
Hiroyuki Tanaka, Y. Umeda, O. Takyu
The visible light communications that communicates by modulating the light of illumination, which is the existing infrastructure, attracts attention. So as to improve the speed, to increase the bandwidth, and to miniaturize hardware of this communication system, improvement in the transmission speed by a single LED for lighting is important. The transmission speed of an LED is greatly restricted by the carrier that remains in junction capacity. Therefore, the transmission speed can be increased by drawing out the remaining carrier. We proposed and applied the carrier drawing-out circuit to the driver circuit that drives a blue LED. An optical measurement shows that the fall time decreases from 56 to 10 ns (decreases to one fifth), and the horizontal eye opening ratio has been improved from 29% to 61% (increases to 213%) for 50 Mb/s PRBS.
{"title":"High-speed LED driver for visible light communications with drawing-out of remaining carrier","authors":"Hiroyuki Tanaka, Y. Umeda, O. Takyu","doi":"10.1109/RWS.2011.5725444","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725444","url":null,"abstract":"The visible light communications that communicates by modulating the light of illumination, which is the existing infrastructure, attracts attention. So as to improve the speed, to increase the bandwidth, and to miniaturize hardware of this communication system, improvement in the transmission speed by a single LED for lighting is important. The transmission speed of an LED is greatly restricted by the carrier that remains in junction capacity. Therefore, the transmission speed can be increased by drawing out the remaining carrier. We proposed and applied the carrier drawing-out circuit to the driver circuit that drives a blue LED. An optical measurement shows that the fall time decreases from 56 to 10 ns (decreases to one fifth), and the horizontal eye opening ratio has been improved from 29% to 61% (increases to 213%) for 50 Mb/s PRBS.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114625275","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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