Pub Date : 2011-03-07DOI: 10.1109/RWS.2011.5725456
K. Ishii, K. Ishibashi, H. Ochiai
We propose a novel cooperative protocol with the joint channel and network code for the multiple-access relay channel with two sources, one relay, and one destination. In the proposed cooperation, by using a superposition technique, the relay node combines the information from both sources and forwards it to the destination, simultaneously. Although several superposition techniques have been proposed (e.g., superposition modulation, network coding), we will utilize a modified nested coding scheme which can be applied to iterative decoding. In the proposed relay system, the decoding operation at the destination node is adaptively changed according to the decoding results of each direct link (from source to destination channel), but the structures of sources and relay are not changed. If the one of the direct links is in failure, the system can be operated as just the distributed turbo coding proposed for the simplest relay channel with one source, one relay and one destination. Even if both direct links are in failure, the destination can still iteratively decode both sources' data with three received signals from individual sources and relay. Simulation results reveal that the proposed system can significantly improve the performance.
{"title":"Multiple-access relay system based on nested distributed turbo code","authors":"K. Ishii, K. Ishibashi, H. Ochiai","doi":"10.1109/RWS.2011.5725456","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725456","url":null,"abstract":"We propose a novel cooperative protocol with the joint channel and network code for the multiple-access relay channel with two sources, one relay, and one destination. In the proposed cooperation, by using a superposition technique, the relay node combines the information from both sources and forwards it to the destination, simultaneously. Although several superposition techniques have been proposed (e.g., superposition modulation, network coding), we will utilize a modified nested coding scheme which can be applied to iterative decoding. In the proposed relay system, the decoding operation at the destination node is adaptively changed according to the decoding results of each direct link (from source to destination channel), but the structures of sources and relay are not changed. If the one of the direct links is in failure, the system can be operated as just the distributed turbo coding proposed for the simplest relay channel with one source, one relay and one destination. Even if both direct links are in failure, the destination can still iteratively decode both sources' data with three received signals from individual sources and relay. Simulation results reveal that the proposed system can significantly improve the performance.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"54 68 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":"126005754","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.2011.5725510
Victor M. Vergara, S. Barbin
Weibull MIMO channels are difficult to analyze due to their non-linear characteristic. While phase is not a major factor in SISO systems, the analysis of Weibull MIMO systems cannot easily discard it. The capacity upper bound in this work includes the contributions of both envelope and phase through the application of first and second moments of channel matrix elements. The capacity bound allow us to study fading severity as gain or loss of bits. Numerical results confirm the effectiveness of the approach and present a comparison of information rates between Weibull and Rayleigh distributions.
{"title":"On MIMO capacity of Weibull Fading channels","authors":"Victor M. Vergara, S. Barbin","doi":"10.1109/RWS.2011.5725510","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725510","url":null,"abstract":"Weibull MIMO channels are difficult to analyze due to their non-linear characteristic. While phase is not a major factor in SISO systems, the analysis of Weibull MIMO systems cannot easily discard it. The capacity upper bound in this work includes the contributions of both envelope and phase through the application of first and second moments of channel matrix elements. The capacity bound allow us to study fading severity as gain or loss of bits. Numerical results confirm the effectiveness of the approach and present a comparison of information rates between Weibull and Rayleigh distributions.","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":"126063258","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.2011.5725425
A. Ulusoy, Gang Liu, A. Trasser, S. Chartier, H. Schumacher
In this work, we present a synchronous receiver architecture utilizing analog carrier recovery, to be used in multi-gigabit wireless communication systems. Carrier phase and frequency synchronization in the analog receiver drastically reduces cost and simplifies the system design by enabling the usage of 1-bit resolution analog to digital converters (ADC). The focus of this work is mainly the analog carrier recovery, which forms the basis of the proposed receiver. Simulation and experimental results are presented, demonstrating the applicability of the presented analog receiver concept for multi-gigabit communication links.
{"title":"Analog synchronous receiver for multi-gigabit wireless communications","authors":"A. Ulusoy, Gang Liu, A. Trasser, S. Chartier, H. Schumacher","doi":"10.1109/RWS.2011.5725425","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725425","url":null,"abstract":"In this work, we present a synchronous receiver architecture utilizing analog carrier recovery, to be used in multi-gigabit wireless communication systems. Carrier phase and frequency synchronization in the analog receiver drastically reduces cost and simplifies the system design by enabling the usage of 1-bit resolution analog to digital converters (ADC). The focus of this work is mainly the analog carrier recovery, which forms the basis of the proposed receiver. Simulation and experimental results are presented, demonstrating the applicability of the presented analog receiver concept for multi-gigabit communication links.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"22 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":"127557654","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.2011.5725454
Nan Ni, A. Cardona
Tunable 3.5GHz and 1.5GHz chip antennas are presented in this paper. By applying tunable matching networks, the chip antennas show tunable characteristic. Especially, the capacitors in the matching networks are tunable thin-film BST capacitors, which have a 3∶1 tuning ratio. The capacitance of the BST capacitors can be tuned by an external DC bias voltage. By varying the capacitance, the tunable matching networks increased the bandwidth of the 3.5GHz antenna by 80%, and the 1.5GHz antenna by 26%.
{"title":"Tunable 3.5GHz and 1.5GHz chip antennas based on thin-film BaSrTiO3 capacitors","authors":"Nan Ni, A. Cardona","doi":"10.1109/RWS.2011.5725454","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725454","url":null,"abstract":"Tunable 3.5GHz and 1.5GHz chip antennas are presented in this paper. By applying tunable matching networks, the chip antennas show tunable characteristic. Especially, the capacitors in the matching networks are tunable thin-film BST capacitors, which have a 3∶1 tuning ratio. The capacitance of the BST capacitors can be tuned by an external DC bias voltage. By varying the capacitance, the tunable matching networks increased the bandwidth of the 3.5GHz antenna by 80%, and the 1.5GHz antenna by 26%.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"7 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":"125247803","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.2011.5725436
V. Sekar, K. Entesari
This paper investigates the design and implementation of integrated bandpass filters in standard 90-nm CMOS technology for K-band applications. A Chebyshev bandpass filter with a measured 7% 1-dB bandwidth at 20 GHz is realized using lumped-element components. Meander-line inductors are implemented using the thick metallization layer of the CMOS process to improve the filter quality factor. Metal-insulator-metal (MIM) capacitors are implemented using the thin SiO2 layer of the process to reduce the size of the filter. The effect of dense metal filling is considered in full-wave simulations to predict the filter response after fabrication. Measurement results show an insertion loss of 5 dB, a return loss better than 10 dB and an unloaded quality factor of 12.5 for the bandpass filter at 20 GHz. The reported filter is at least 10 times smaller compared to the equivalent microstrip-based filter at K-band frequency.
{"title":"A K-band integrated bandpass filter in 90-nm CMOS technology","authors":"V. Sekar, K. Entesari","doi":"10.1109/RWS.2011.5725436","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725436","url":null,"abstract":"This paper investigates the design and implementation of integrated bandpass filters in standard 90-nm CMOS technology for K-band applications. A Chebyshev bandpass filter with a measured 7% 1-dB bandwidth at 20 GHz is realized using lumped-element components. Meander-line inductors are implemented using the thick metallization layer of the CMOS process to improve the filter quality factor. Metal-insulator-metal (MIM) capacitors are implemented using the thin SiO2 layer of the process to reduce the size of the filter. The effect of dense metal filling is considered in full-wave simulations to predict the filter response after fabrication. Measurement results show an insertion loss of 5 dB, a return loss better than 10 dB and an unloaded quality factor of 12.5 for the bandpass filter at 20 GHz. The reported filter is at least 10 times smaller compared to the equivalent microstrip-based filter at K-band frequency.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"30 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":"130735457","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.2011.5725458
Shinji Ohara, I. Oka, S. Ata
In this paper, a robust QAM classification in a frequency offset channel is considered. When a carrier frequency is not recovered with the sufficient accuracy in a receiver, a signal point rotates in a vector diagram. This paper presents the classification method by the amplitude and squared cosine moments. In the method, phase shifts are employed for the squared cosine moments in order to change a square QAM constellation to a virtual circular constellation, which improves the classification performance. Simulation results of the classification error probability show the effectiveness of the proposed method for QAM classification in the presence of frequency offset. The classification error probability is also expressed by both amplitude and squared cosine moments which are derived from the probability density function of the received signal.
{"title":"Robust QAM classification by moments and its error probability analysis","authors":"Shinji Ohara, I. Oka, S. Ata","doi":"10.1109/RWS.2011.5725458","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725458","url":null,"abstract":"In this paper, a robust QAM classification in a frequency offset channel is considered. When a carrier frequency is not recovered with the sufficient accuracy in a receiver, a signal point rotates in a vector diagram. This paper presents the classification method by the amplitude and squared cosine moments. In the method, phase shifts are employed for the squared cosine moments in order to change a square QAM constellation to a virtual circular constellation, which improves the classification performance. Simulation results of the classification error probability show the effectiveness of the proposed method for QAM classification in the presence of frequency offset. The classification error probability is also expressed by both amplitude and squared cosine moments which are derived from the probability density function of the received signal.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"14 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":"125545817","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.2011.5725514
U. Yodprasit, M. Motoyoshi, R. Fujimoto, K. Takano, M. Fujishima
In this paper, we report a low-power voltage-controlled oscillator optimized for an operation around 100 GHz. The ultimate targets of this design are to maximize the oscillation frequency and minimize the power consumption of the oscillator. At the same time, the oscillator must provide a reasonable tuning range and an acceptable phase noise performance. To achieve these stringent requirements, the design procedure has been carefully considered. In addition, modifications from standard RF CMOS process are omitted to simplify the design process. The implemented oscillator uses transmission lines as the inductive element and inversion-mode MOSFET varactors as the tuning element. Integrated in a 65-nm CMOS process, the oscillator can operate with a supply voltage of as low as 0.7 V while exhibiting a tuning range between 105.48 to 106.88 GHz, a phase noise at the center of the tuning range of −89.2 dBc/Hz at 1-MHz offset (−105.9 dBc/Hz at 3-MHz offset) and consuming 2.59 mW (including output buffers).
{"title":"A 2.6-mW 106-GHz transmission-line-based voltage-controlled oscillator integrated in a 65-nm CMOS process","authors":"U. Yodprasit, M. Motoyoshi, R. Fujimoto, K. Takano, M. Fujishima","doi":"10.1109/RWS.2011.5725514","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725514","url":null,"abstract":"In this paper, we report a low-power voltage-controlled oscillator optimized for an operation around 100 GHz. The ultimate targets of this design are to maximize the oscillation frequency and minimize the power consumption of the oscillator. At the same time, the oscillator must provide a reasonable tuning range and an acceptable phase noise performance. To achieve these stringent requirements, the design procedure has been carefully considered. In addition, modifications from standard RF CMOS process are omitted to simplify the design process. The implemented oscillator uses transmission lines as the inductive element and inversion-mode MOSFET varactors as the tuning element. Integrated in a 65-nm CMOS process, the oscillator can operate with a supply voltage of as low as 0.7 V while exhibiting a tuning range between 105.48 to 106.88 GHz, a phase noise at the center of the tuning range of −89.2 dBc/Hz at 1-MHz offset (−105.9 dBc/Hz at 3-MHz offset) and consuming 2.59 mW (including output buffers).","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"31 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":"126542578","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.2011.5725453
Nan Ni, A. Cardona
This paper describes the design of Ku-band phase shifters based on all-pass filters and BST tunable capacitors. With high tunability capacitors using thin-film BST, each all-pass section can achieve 90 degree or greater phase shift. 360 degree phase shift can be achieved by cascading four sections of the all-pass tunable filters. Especially, these four all-pass sections are designed with two different center frequencies. The center frequency of the phase shifter is 13GHz. Two of the sections have the center frequency lower than 13GHz, while the other two are higher than 13GHz. Numerical and experimental data show that this staggered structure has flatter insertion loss and phase shift compared to previous designs..
{"title":"Ku-band analog phase shifters using individually designed all-pass networks with BST tunable capacitors","authors":"Nan Ni, A. Cardona","doi":"10.1109/RWS.2011.5725453","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725453","url":null,"abstract":"This paper describes the design of Ku-band phase shifters based on all-pass filters and BST tunable capacitors. With high tunability capacitors using thin-film BST, each all-pass section can achieve 90 degree or greater phase shift. 360 degree phase shift can be achieved by cascading four sections of the all-pass tunable filters. Especially, these four all-pass sections are designed with two different center frequencies. The center frequency of the phase shifter is 13GHz. Two of the sections have the center frequency lower than 13GHz, while the other two are higher than 13GHz. Numerical and experimental data show that this staggered structure has flatter insertion loss and phase shift compared to previous designs..","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"2 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":"117301815","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.2011.5725502
Bo Yang, E. Skafidas, R. Evans
A novel slow-wave structure for microstrip lines is proposed. Unlike conventional slow-wave structures such as photonic bandgap (PBG) and ladder microstrip lines, which only deal with the substrate, ground plane or the signal line of a microstrip separately, the periodic patterns of this new slow-wave structure are etched in both the conductive metal strip and the ground plane of the proposed microstrip line. No extra drilling through the substrate is required. The designed slow-wave structure exhibits that size reduction and minimal loss increase can be achieved simultaneously. 2nd-order rectangular open-loop filters with and without implementing the proposed slow-wave structure have been designed and fabricated in the millimeter-wave (mm-wave) range on 65-nm bulk CMOS. Both simulations and measurements demonstrate the new design has a 52.7% size reduction with only 0.5 dB penalty in transmission loss. To author's best knowledge this compact filter is the first reported mm-wave filter using slow-wave structure on bulk CMOS.
{"title":"A novel slow-wave structure for millimeter-wave filter application on bulk CMOS","authors":"Bo Yang, E. Skafidas, R. Evans","doi":"10.1109/RWS.2011.5725502","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725502","url":null,"abstract":"A novel slow-wave structure for microstrip lines is proposed. Unlike conventional slow-wave structures such as photonic bandgap (PBG) and ladder microstrip lines, which only deal with the substrate, ground plane or the signal line of a microstrip separately, the periodic patterns of this new slow-wave structure are etched in both the conductive metal strip and the ground plane of the proposed microstrip line. No extra drilling through the substrate is required. The designed slow-wave structure exhibits that size reduction and minimal loss increase can be achieved simultaneously. 2nd-order rectangular open-loop filters with and without implementing the proposed slow-wave structure have been designed and fabricated in the millimeter-wave (mm-wave) range on 65-nm bulk CMOS. Both simulations and measurements demonstrate the new design has a 52.7% size reduction with only 0.5 dB penalty in transmission loss. To author's best knowledge this compact filter is the first reported mm-wave filter using slow-wave structure on bulk CMOS.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"16 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":"134141456","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.2011.5725496
Jungsuk Kim, Hyunchul Kim, K. Pedrotti
This paper studies an inductive link optimization for implantable systems. By considering the relationship between wire diameter, number of turns, quality factor, coupling coefficient, and shape of coil, we can optimize the inductively coupled coils to maximize the power transfer efficiency in the face of geometric constraints. In this work, an intraocular prosthesis is used for a design example and power transfer efficiency of 45.8% is achieved where the secondary coil has a single layer of 11 turns, 0.064cm wire diameter, a self-inductance of 3.8µH, and Q of 65.
{"title":"Power-efficient inductive link optimization for implantable systems","authors":"Jungsuk Kim, Hyunchul Kim, K. Pedrotti","doi":"10.1109/RWS.2011.5725496","DOIUrl":"https://doi.org/10.1109/RWS.2011.5725496","url":null,"abstract":"This paper studies an inductive link optimization for implantable systems. By considering the relationship between wire diameter, number of turns, quality factor, coupling coefficient, and shape of coil, we can optimize the inductively coupled coils to maximize the power transfer efficiency in the face of geometric constraints. In this work, an intraocular prosthesis is used for a design example and power transfer efficiency of 45.8% is achieved where the secondary coil has a single layer of 11 turns, 0.064cm wire diameter, a self-inductance of 3.8µH, and Q of 65.","PeriodicalId":250672,"journal":{"name":"2011 IEEE Radio and Wireless Symposium","volume":"107 21","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114133117","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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