Pub Date : 2011-03-07DOI: 10.1109/RWS.2011.5725471
J. Walk, T. Ussmueller, R. Weigel, G. Fischer
This work addresses system aspects of implantable medical sensor devices. Different concepts for power supply and communication are compared and discussed. State of the art systems mainly rely on one common frequency for both wireless data and energy transmission. This publication highlights the specific pros and cons of different frequency ranges. The proposed Split Frequencies Concept (SFC) uses two separate frequency bands: One for energy harvesting and the second for data transmission. Hence the advantages of HF and UHF frequencies can be combined into a single system.
{"title":"Improvements of wireless communication and energy harvesting aspects for implantable sensor interfaces by using the Split Frequencies Concept","authors":"J. Walk, T. Ussmueller, R. Weigel, G. Fischer","doi":"10.1109/RWS.2011.5725471","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725471","url":null,"abstract":"This work addresses system aspects of implantable medical sensor devices. Different concepts for power supply and communication are compared and discussed. State of the art systems mainly rely on one common frequency for both wireless data and energy transmission. This publication highlights the specific pros and cons of different frequency ranges. The proposed Split Frequencies Concept (SFC) uses two separate frequency bands: One for energy harvesting and the second for data transmission. Hence the advantages of HF and UHF frequencies can be combined into a single system.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"415 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":"123264742","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.2011.5725431
Xin Wang, S. Fan, B. Qin, Jian Liu, Lin Lin, He Tang, H Zhao, Q. Fang, Albert Z. H. Wang, J. He, B. Zhao, R. Wong, Shi-Jie Wen
This paper reports a single-chip full-band 3.1–10.6GHz ESD UWB LNA featuring cascode shunt-series feedback topology and very robust whole-chip ESD protection. Careful ESD+LNA co-design was excised to achieve full-chip circuit optimization with high ESD protection. This design is implemented in a foundry 0.18µm RFCMOS process. Measurement shows the highest reported ESD protection of 8.25kV, a peak gain of 10.9dB, a good gain flatness of 3.64%/GHz across 3.1–10.6GHz, low input reflection of <−10dB, noise figure of 4.98dB, group delay of 103±35pS and good linearity with P1-dB=2.88dBm@7GHz.
{"title":"Full band UWB LNA with 8kV+ ESD protection in RFCMOS","authors":"Xin Wang, S. Fan, B. Qin, Jian Liu, Lin Lin, He Tang, H Zhao, Q. Fang, Albert Z. H. Wang, J. He, B. Zhao, R. Wong, Shi-Jie Wen","doi":"10.1109/RWS.2011.5725431","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725431","url":null,"abstract":"This paper reports a single-chip full-band 3.1–10.6GHz ESD UWB LNA featuring cascode shunt-series feedback topology and very robust whole-chip ESD protection. Careful ESD+LNA co-design was excised to achieve full-chip circuit optimization with high ESD protection. This design is implemented in a foundry 0.18µm RFCMOS process. Measurement shows the highest reported ESD protection of 8.25kV, a peak gain of 10.9dB, a good gain flatness of 3.64%/GHz across 3.1–10.6GHz, low input reflection of <−10dB, noise figure of 4.98dB, group delay of 103±35pS and good linearity with P1-dB=2.88dBm@7GHz.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"50 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":"124874736","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.2011.5725494
A. Amadjikpe, D. Choudhury, G. Ponchak, J. Papapolymerou
60 GHz antennas are embedded in a laptop base to evaluate radiation characteristics from different locations. It is shown that unlike at 2.4 GHz, the base-mounted antenna is very sensitive to small shape deformations from the cover platform, and this is attributed to diffraction from these deformations that are within a wavelength at 60 GHz. Effects of the lid on the base-mounted antenna are also investigated.
{"title":"60 GHz antenna integration in a laptop computer base for WPAN applications","authors":"A. Amadjikpe, D. Choudhury, G. Ponchak, J. Papapolymerou","doi":"10.1109/RWS.2011.5725494","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725494","url":null,"abstract":"60 GHz antennas are embedded in a laptop base to evaluate radiation characteristics from different locations. It is shown that unlike at 2.4 GHz, the base-mounted antenna is very sensitive to small shape deformations from the cover platform, and this is attributed to diffraction from these deformations that are within a wavelength at 60 GHz. Effects of the lid on the base-mounted antenna are also investigated.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"21 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":"127055865","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.2011.5725411
Jangsu Kim, D. An, H. Ryu, Jin-Up Kim
DFT (discrete Fourier transform) spread OFDM is used a lot to solve high PAPR problem of OFDM (orthogonal frequency division multiplexing) system. However, PAPR is increased again in DFT spreading OFDM system when comb type of pilot is exploited to estimate channel characteristics effectively. So, in this paper, we apply a SLM (selective mapping) method to DFT spreading OFDM system to reduce increased PAPR characteristics. And we suggest an effective method to transmit side information without additional bandwidth. Also, we propose an adaptive sub-carrier allocation method to improve system performance against interference or jamming. We would like to analyze proposed SLM based DFT spreading OFDM system using adaptive sub-carrier allocation method. And we compare and analyze system performance through simulation under multi-tone jamming (MTJ) and partial band jamming (PBJ) environments.
{"title":"Analysis and design of SLM based DFT spreading OFDM system for active anti-jamming system","authors":"Jangsu Kim, D. An, H. Ryu, Jin-Up Kim","doi":"10.1109/RWS.2011.5725411","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725411","url":null,"abstract":"DFT (discrete Fourier transform) spread OFDM is used a lot to solve high PAPR problem of OFDM (orthogonal frequency division multiplexing) system. However, PAPR is increased again in DFT spreading OFDM system when comb type of pilot is exploited to estimate channel characteristics effectively. So, in this paper, we apply a SLM (selective mapping) method to DFT spreading OFDM system to reduce increased PAPR characteristics. And we suggest an effective method to transmit side information without additional bandwidth. Also, we propose an adaptive sub-carrier allocation method to improve system performance against interference or jamming. We would like to analyze proposed SLM based DFT spreading OFDM system using adaptive sub-carrier allocation method. And we compare and analyze system performance through simulation under multi-tone jamming (MTJ) and partial band jamming (PBJ) environments.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"114 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":"127141630","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.2011.5725439
M. Hagiwara, T. Kitayabu, H. Ishikawa, H. Shirai
In this paper, a novel delta-sigma modulator which has a non-uniform quantizer is proposed. The step sizes of a non-uniform quantizer are, in general, uniquely determined by the probability density function (PDF) of an input signal amplitude, while delta-sigma modulators usually become unstable when the non-uniform quantizer is directly applied to them. It is found that the proposed delta-sigma modulator reduces a quantization noise and works in a stable condition. To guarantee the stability of the delta-sigma modulator, the maximum output value of the quantizer is fixed at a certain value. The rest of the output and threshold values of the non-uniform quantizer are determined by the PDF of the input signal amplitude. The simulation results show that the quantization noise power is reduced by up to 2.90 dB when the non-uniform quantizer is applied.
{"title":"Delta-sigma modulator with non-uniform quantization","authors":"M. Hagiwara, T. Kitayabu, H. Ishikawa, H. Shirai","doi":"10.1109/RWS.2011.5725439","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725439","url":null,"abstract":"In this paper, a novel delta-sigma modulator which has a non-uniform quantizer is proposed. The step sizes of a non-uniform quantizer are, in general, uniquely determined by the probability density function (PDF) of an input signal amplitude, while delta-sigma modulators usually become unstable when the non-uniform quantizer is directly applied to them. It is found that the proposed delta-sigma modulator reduces a quantization noise and works in a stable condition. To guarantee the stability of the delta-sigma modulator, the maximum output value of the quantizer is fixed at a certain value. The rest of the output and threshold values of the non-uniform quantizer are determined by the PDF of the input signal amplitude. The simulation results show that the quantization noise power is reduced by up to 2.90 dB when the non-uniform quantizer is applied.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"9 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":"126145558","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.2011.5725515
J. Kiriazi, O. Boric-Lubecke, V. Lubecke
This paper describes the different considerations and challenges in measuring human cardiopulmonary radar cross section (RCS). The effect of clutter on the received signal is explained as well as the importance of preserving baseband dc content for valid readings. The center estimation algorithm with dc-cancellation is presented as a solution to restore dc content in the baseband signals and to exclude clutter contribution. The far-field conditions for the target range are revisited. By modeling the human torso as a half-cylinder and assuming unity reflectivity, the ratio of the RCS of the back of the torso with respect to the front is a function of wavelength. At 2.4 GHz and for a chest breadth of 30 cm, the back is expected to have an RCS that is 10 times that of the front while the RCS of the side is expected to be 4 times smaller.
{"title":"Considerations in measuring vital signs cross section with Doppler radar","authors":"J. Kiriazi, O. Boric-Lubecke, V. Lubecke","doi":"10.1109/RWS.2011.5725515","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725515","url":null,"abstract":"This paper describes the different considerations and challenges in measuring human cardiopulmonary radar cross section (RCS). The effect of clutter on the received signal is explained as well as the importance of preserving baseband dc content for valid readings. The center estimation algorithm with dc-cancellation is presented as a solution to restore dc content in the baseband signals and to exclude clutter contribution. The far-field conditions for the target range are revisited. By modeling the human torso as a half-cylinder and assuming unity reflectivity, the ratio of the RCS of the back of the torso with respect to the front is a function of wavelength. At 2.4 GHz and for a chest breadth of 30 cm, the back is expected to have an RCS that is 10 times that of the front while the RCS of the side is expected to be 4 times smaller.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"29 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":"126534957","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.2011.5725460
R. Nakamura, A. Kajiwara
This paper presents an ultra wideband (UWB) microwave sensor using a stepped-FM scheme. Impulse-radio UWB sensor requires high speed A/D in order to synchronize and detect the nanosecond pulse echo. Also it may be difficult to use the bandwidth wider than 500MHz without causing interference with other wireless systems. Our suggested scheme which does not require any high speed A/D devices can coexist with other wireless systems since spectrum holes (non-activated within a portion of the radio spectrum) are easy to be designed over specific bandwidth. In this paper, the measurements were conducted using the experimental device and the above mentioned characteristic is investigated.
{"title":"Empirical study of stepped-FM UWB microwave sensor","authors":"R. Nakamura, A. Kajiwara","doi":"10.1109/RWS.2011.5725460","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725460","url":null,"abstract":"This paper presents an ultra wideband (UWB) microwave sensor using a stepped-FM scheme. Impulse-radio UWB sensor requires high speed A/D in order to synchronize and detect the nanosecond pulse echo. Also it may be difficult to use the bandwidth wider than 500MHz without causing interference with other wireless systems. Our suggested scheme which does not require any high speed A/D devices can coexist with other wireless systems since spectrum holes (non-activated within a portion of the radio spectrum) are easy to be designed over specific bandwidth. In this paper, the measurements were conducted using the experimental device and the above mentioned characteristic is investigated.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"63 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":"128055545","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.2011.5725434
G. Ponchak, A. Amadjikpe, D. Choudhury, J. Papapolymerou
In this paper, the first measurements of the received radiated power between antennas located on a conference table to simulate the environment of antennas embedded in laptop computers for 60 GHz WPAN applications is presented. A high gain horn antenna and a medium gain microstrip patch antenna for two linear polarizations are compared. It is shown that for a typical conference table arrangement with five computers, books, pens, and coffee cups, the antennas should be placed a minimum of 5 cm above the table, but that a height of greater than 20 cm may be required to maximize the received power in all cases.
{"title":"Experimental investigation of 60 GHz transmission characteristics between computers on a conference table for WPAN applications","authors":"G. Ponchak, A. Amadjikpe, D. Choudhury, J. Papapolymerou","doi":"10.1109/RWS.2011.5725434","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725434","url":null,"abstract":"In this paper, the first measurements of the received radiated power between antennas located on a conference table to simulate the environment of antennas embedded in laptop computers for 60 GHz WPAN applications is presented. A high gain horn antenna and a medium gain microstrip patch antenna for two linear polarizations are compared. It is shown that for a typical conference table arrangement with five computers, books, pens, and coffee cups, the antennas should be placed a minimum of 5 cm above the table, but that a height of greater than 20 cm may be required to maximize the received power in all cases.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"41 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":"128175551","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.2011.5725441
Sanae Nakao, T. Norimatsu, T. Yamazoe, T. Oshima, Kazuyoshi Watanabe, K. Minatozaki, Yohei Kobayashi
A prototype UHF RFID reader chip for mobile-phone applications was developed. The reader architecture is designed for passive tags in compliance with the ISO/IEC 18000-6 Type C and the EPCglobal Class-1 Generation-2 protocols for UHF RFID air interface. The reader also supports communication with active tags. Experimentally measured performance shows the reader chip achieves very high sensitivities (namely, −86 dBm and −92 dBm) for passive and active RFID systems, respectively. The reader chip, with 1.8-V power supply, was fabricated in a 0.18-µm CMOS process.
{"title":"UHF RFID mobile reader for passive- and active-tag communication","authors":"Sanae Nakao, T. Norimatsu, T. Yamazoe, T. Oshima, Kazuyoshi Watanabe, K. Minatozaki, Yohei Kobayashi","doi":"10.1109/RWS.2011.5725441","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725441","url":null,"abstract":"A prototype UHF RFID reader chip for mobile-phone applications was developed. The reader architecture is designed for passive tags in compliance with the ISO/IEC 18000-6 Type C and the EPCglobal Class-1 Generation-2 protocols for UHF RFID air interface. The reader also supports communication with active tags. Experimentally measured performance shows the reader chip achieves very high sensitivities (namely, −86 dBm and −92 dBm) for passive and active RFID systems, respectively. The reader chip, with 1.8-V power supply, was fabricated in a 0.18-µm CMOS process.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"55 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":"125380450","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.2011.5725479
Tanish Agrawal, V. Lakkundi, Anthony Griffin, P. Tsakalides
This paper considers compressed sensing (CS) techniques for signal reconstruction and channel estimation in OFDM-based high-rate ultra wideband (UWB) communication systems. We employ a parallel CS structure that exploits frequency domain sparsity. We also consider multipath UWB channels in both the line-of-sight and non line-of-sight environments. UWB signal detection and channel estimation from sub-Nyquist analog projections is carried out using an optimized orthogonal matching pursuit algorithm and the smoothed ℓ0 algorithm. Simulation results demonstrate significant gains in the form of reliable signal recovery and channel estimation as well as dramatically sub-Nyquist sampling rates for the analog-to-digital converters while maintaining high data rates.
{"title":"Compressed sensing for OFDM UWB systems","authors":"Tanish Agrawal, V. Lakkundi, Anthony Griffin, P. Tsakalides","doi":"10.1109/RWS.2011.5725479","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725479","url":null,"abstract":"This paper considers compressed sensing (CS) techniques for signal reconstruction and channel estimation in OFDM-based high-rate ultra wideband (UWB) communication systems. We employ a parallel CS structure that exploits frequency domain sparsity. We also consider multipath UWB channels in both the line-of-sight and non line-of-sight environments. UWB signal detection and channel estimation from sub-Nyquist analog projections is carried out using an optimized orthogonal matching pursuit algorithm and the smoothed ℓ0 algorithm. Simulation results demonstrate significant gains in the form of reliable signal recovery and channel estimation as well as dramatically sub-Nyquist sampling rates for the analog-to-digital converters while maintaining high data rates.","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":"129526043","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：