Pub Date : 2008-03-05DOI: 10.1109/RWS.2008.4463447
T. Kuri, Hiroyuki Toda, Ken-ichi Kitayama
Dense wavelength division multiplexed (DWDM) access network which allows to co-exists analog radio-over-fiber (RoF) and digital fiber-to-the-home (FTTH) systems is investigated. Focuses are on the enabling techniques such as optical-frequency-interleaved DWDM grid assignment, supercontinuum multi-wavelength light source, multi-band RoF and digital optical signals transmission, and optical path routing for dynamic channel allocation for wireless services.
{"title":"Radio over fiber: DWDM-based analog/digital access networking and its enabling technologies","authors":"T. Kuri, Hiroyuki Toda, Ken-ichi Kitayama","doi":"10.1109/RWS.2008.4463447","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463447","url":null,"abstract":"Dense wavelength division multiplexed (DWDM) access network which allows to co-exists analog radio-over-fiber (RoF) and digital fiber-to-the-home (FTTH) systems is investigated. Focuses are on the enabling techniques such as optical-frequency-interleaved DWDM grid assignment, supercontinuum multi-wavelength light source, multi-band RoF and digital optical signals transmission, and optical path routing for dynamic channel allocation for wireless services.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122411225","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463429
K. Joshin, T. Kikkawa
We report a current status of high-power GaN HEMTs for high-power and high-efficiency amplifiers with higher efficiency by 5% especially at a backed-off region than the conventional GaN HEMTs. First, we introduce our specific device structure GaN HEMT with dispersion-free I-V characteristics, low Idsq-drift and high reliability. Record average drain efficiency of over 50% and linear gain of 17.2 dB were obtained at an output power of 45 dBm and 2.5 GHz. Next, we discuss their reliability with high-temperature life tests resulting in their estimated life of over 1 times 106 hours at Tj of 200degC. Finally, we describe the next generation GaN HEMTs for millimeter-wave applications.
{"title":"High-power and high-efficiency GaN HEMT amplifiers","authors":"K. Joshin, T. Kikkawa","doi":"10.1109/RWS.2008.4463429","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463429","url":null,"abstract":"We report a current status of high-power GaN HEMTs for high-power and high-efficiency amplifiers with higher efficiency by 5% especially at a backed-off region than the conventional GaN HEMTs. First, we introduce our specific device structure GaN HEMT with dispersion-free I-V characteristics, low Idsq-drift and high reliability. Record average drain efficiency of over 50% and linear gain of 17.2 dB were obtained at an output power of 45 dBm and 2.5 GHz. Next, we discuss their reliability with high-temperature life tests resulting in their estimated life of over 1 times 106 hours at Tj of 200degC. Finally, we describe the next generation GaN HEMTs for millimeter-wave applications.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126082690","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463506
U. Rohde, A. Poddar
The "global roaming" features between wide varieties of networks operating at different frequencies call for the development of reconfigurable concurrent oscillator. The RCO design approach demonstrated in this work can offer low cost configurable signal source, which is amenable for integration in present integrated circuit (IC) technology. The measured phase noise is -130 dBc/Hz at 1 MHz offset from the respective carriers over the tuning range (1800- 2600MHz/3900-5400MHz), and the topology can be easily extended to higher order bands.
{"title":"Reconfigurable concurrent oscillator (RCO)","authors":"U. Rohde, A. Poddar","doi":"10.1109/RWS.2008.4463506","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463506","url":null,"abstract":"The \"global roaming\" features between wide varieties of networks operating at different frequencies call for the development of reconfigurable concurrent oscillator. The RCO design approach demonstrated in this work can offer low cost configurable signal source, which is amenable for integration in present integrated circuit (IC) technology. The measured phase noise is -130 dBc/Hz at 1 MHz offset from the respective carriers over the tuning range (1800- 2600MHz/3900-5400MHz), and the topology can be easily extended to higher order bands.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127651351","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463530
S.-l.S. Yang, A. Kishk, Kai-fong Lee, K. Luk, H. Lai
An antenna that is capable of exciting four different kinds of linearly polarized waves across an overlapped frequency band by four independent feeding ports is presented. The four polarizations embrace the x- and y-polarized waves which have broadside patterns and the thetas and phi-polarized waves which have conical patterns. The x- and y-polarizations (TMH mode) and the thetas-polarization (TM02 mode) are achieved by exciting a circular patch with four shorting posts and five L-shaped probe feeds, while the phi-polarization is achieved by exciting four slots cut on the patch to produce radial magnetic currents. The performance of the antenna is studied numerically and experimentally. A prototype antenna is built and it achieves four polarizations overlapped at about 2.1 GHz, a gain of about 4 dBi for the two conical waves, and a gain of about 11 dBi for the two broadside waves.
{"title":"The design of microstrip patch antenna with four polarizations","authors":"S.-l.S. Yang, A. Kishk, Kai-fong Lee, K. Luk, H. Lai","doi":"10.1109/RWS.2008.4463530","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463530","url":null,"abstract":"An antenna that is capable of exciting four different kinds of linearly polarized waves across an overlapped frequency band by four independent feeding ports is presented. The four polarizations embrace the x- and y-polarized waves which have broadside patterns and the thetas and phi-polarized waves which have conical patterns. The x- and y-polarizations (TMH mode) and the thetas-polarization (TM02 mode) are achieved by exciting a circular patch with four shorting posts and five L-shaped probe feeds, while the phi-polarization is achieved by exciting four slots cut on the patch to produce radial magnetic currents. The performance of the antenna is studied numerically and experimentally. A prototype antenna is built and it achieves four polarizations overlapped at about 2.1 GHz, a gain of about 4 dBi for the two conical waves, and a gain of about 11 dBi for the two broadside waves.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128955741","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463554
J. Kountouriotis, D. Piazza, P. Mookiah, M. d'Amico, K. Dandekar
In this paper we investigate the performance of reconflgurable antennas in an MIMO ad-hoc network. The nodes employ the multiuser waterfllling (known also as iterative waterfllling) power allocation [1], [2] method and we use network sum capacity as a performance metric. We study a centralized configuration selection scheme, which can be used as an upper bound in the sum capacity using reconflgurable antennas, as well as a simple distributed configuration selection scheme, suitable for use in an ad-hoc MIMO network.
{"title":"Reconfigurable antennas for MIMO ad-hoc networks","authors":"J. Kountouriotis, D. Piazza, P. Mookiah, M. d'Amico, K. Dandekar","doi":"10.1109/RWS.2008.4463554","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463554","url":null,"abstract":"In this paper we investigate the performance of reconflgurable antennas in an MIMO ad-hoc network. The nodes employ the multiuser waterfllling (known also as iterative waterfllling) power allocation [1], [2] method and we use network sum capacity as a performance metric. We study a centralized configuration selection scheme, which can be used as an upper bound in the sum capacity using reconflgurable antennas, as well as a simple distributed configuration selection scheme, suitable for use in an ad-hoc MIMO network.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121572779","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463612
N. Sasaki, M. Fukuda, K. Kimoto, T. Kikkawa
Ultra-wideband (UWB) transmitter and receiver circuits were developed and inter-chip wireless communication with silicon integrated antennas using Gaussian monocycle pulse (GMP) was performed. Inter-chip data transmissions for stacked Si LS's having GMP transmitter circuits by use of 0.18 mum CMOS technology were performed. Differential Gaussian monocycle pulses with data rates of 200 Mbps were generated. On-off-keying (OOK) modulation scheme was adopted for data transmission. Synchronous GMP receiver having double GMP generators was developed. Clock timing and OOK data pulses were alternately sent using on-chip transmitting antenna. 200 Mbps data recovery was achieved at the distance of 0.5 mm.
研制了超宽带(UWB)收发电路，实现了基于高斯单环脉冲(GMP)的硅集成天线芯片间无线通信。采用0.18 μ m CMOS技术实现了具有GMP发射电路的堆叠Si LS的片间数据传输。产生数据速率为200mbps的高斯差分单环脉冲。数据传输采用开-关键(OOK)调制方式。研制了双GMP发生器同步GMP接收器。时钟定时和OOK数据脉冲通过片上发射天线交替发送。在0.5 mm的距离上实现了200mbps的数据恢复。
{"title":"CMOS UWB transmitter and receiver with silicon integrated antennas for inter-chip wireless interconnection","authors":"N. Sasaki, M. Fukuda, K. Kimoto, T. Kikkawa","doi":"10.1109/RWS.2008.4463612","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463612","url":null,"abstract":"Ultra-wideband (UWB) transmitter and receiver circuits were developed and inter-chip wireless communication with silicon integrated antennas using Gaussian monocycle pulse (GMP) was performed. Inter-chip data transmissions for stacked Si LS's having GMP transmitter circuits by use of 0.18 mum CMOS technology were performed. Differential Gaussian monocycle pulses with data rates of 200 Mbps were generated. On-off-keying (OOK) modulation scheme was adopted for data transmission. Synchronous GMP receiver having double GMP generators was developed. Clock timing and OOK data pulses were alternately sent using on-chip transmitting antenna. 200 Mbps data recovery was achieved at the distance of 0.5 mm.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132683047","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463537
D. Trinchero, A. Galardinr, R. Stefanelli, E. Guariso, F. Cambiotti, F. Troisr, L. Baldaccr, D. Della Monica, E. Ragno, R. Moriondo, M. Ancillr, S. Schiavr
The paper describes the results obtained from a research activity aimed to realise very-low-cost wireless transmitters for the realisation of high capacity point-to-point radio-links over huge distances. The transmitters were obtained from recycled PC hardware components and low- cost radio boards for IEEE 802.11a and IEEE 802.11 h applications. The manufactured hardware was used to implement a topology network made of links ranging from 100 to 300 kms. Performance analyses were run for about six months, showing extraordinary stability and reliability and excellent data transport performance..
{"title":"An independent, low cost and open source solution for the realisation of wireless links over huge multikilometric distance","authors":"D. Trinchero, A. Galardinr, R. Stefanelli, E. Guariso, F. Cambiotti, F. Troisr, L. Baldaccr, D. Della Monica, E. Ragno, R. Moriondo, M. Ancillr, S. Schiavr","doi":"10.1109/RWS.2008.4463537","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463537","url":null,"abstract":"The paper describes the results obtained from a research activity aimed to realise very-low-cost wireless transmitters for the realisation of high capacity point-to-point radio-links over huge distances. The transmitters were obtained from recycled PC hardware components and low- cost radio boards for IEEE 802.11a and IEEE 802.11 h applications. The manufactured hardware was used to implement a topology network made of links ranging from 100 to 300 kms. Performance analyses were run for about six months, showing extraordinary stability and reliability and excellent data transport performance..","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133735437","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463425
O. Gunther, D. Steinbuch, O. Bruggemann, H. Jager, R. Weigel
The DC-offset compensation of a monostatic FMCW-radar transceiver using transmission line (TL) length optimization is proposed. This approach can be implemented on a 77 GHz SiGe MMIC (Monolithic Microwave Integrated Circuit) with no extra costs and does not degrade the sensitivity for immediate targets needed for the stop-and- go functionality of modern ACC (Adaptive Cruise Control) systems. The theory of the DC-offset generation will be discussed and a network analysis of the transceiver will be presented. It is shown that the compensation is possible over a wide range of circuit imperfection values.
{"title":"DC-offset compensation of a 77 GHz monostatic FMCW-radar transceiver for automotive application","authors":"O. Gunther, D. Steinbuch, O. Bruggemann, H. Jager, R. Weigel","doi":"10.1109/RWS.2008.4463425","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463425","url":null,"abstract":"The DC-offset compensation of a monostatic FMCW-radar transceiver using transmission line (TL) length optimization is proposed. This approach can be implemented on a 77 GHz SiGe MMIC (Monolithic Microwave Integrated Circuit) with no extra costs and does not degrade the sensitivity for immediate targets needed for the stop-and- go functionality of modern ACC (Adaptive Cruise Control) systems. The theory of the DC-offset generation will be discussed and a network analysis of the transceiver will be presented. It is shown that the compensation is possible over a wide range of circuit imperfection values.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126976903","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463568
V. Desai, J. Kepler, F. Vook
Transmit adaptive beamforming can be applied on the subcarriers of an OFDM system to obtain a coherent processing gain at the receiver. The IEEE 802.16e-2005 standard for mobile broadband wireless access contains signaling strategies that facilitate the use of downlink adaptive beam- forming which leverages time-division duplex (TDD) channel reciprocity. Motorola Labs has developed an experimental mobile multi-antenna OFDM system that implements a realtime, adaptive beamformer that uses these strategies. This paper describes key components and parameters of this experimental system and describes the results of field experiments that show the performance gains realized by this platform.
{"title":"Field data showing the downlink adaptive beamforming gains in an experimental IEEE 802.16e-2005 OFDMA system","authors":"V. Desai, J. Kepler, F. Vook","doi":"10.1109/RWS.2008.4463568","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463568","url":null,"abstract":"Transmit adaptive beamforming can be applied on the subcarriers of an OFDM system to obtain a coherent processing gain at the receiver. The IEEE 802.16e-2005 standard for mobile broadband wireless access contains signaling strategies that facilitate the use of downlink adaptive beam- forming which leverages time-division duplex (TDD) channel reciprocity. Motorola Labs has developed an experimental mobile multi-antenna OFDM system that implements a realtime, adaptive beamformer that uses these strategies. This paper describes key components and parameters of this experimental system and describes the results of field experiments that show the performance gains realized by this platform.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130803846","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 : 2008-03-05DOI: 10.1109/RWS.2008.4463480
T. Khanzada, A. Ali, A. Omar
Single Carrier Transmission (SCT) is a competing technique for Orthogonal Frequency Division Multiplexing (OFDM) in Broadband Wireless Systems (BWS). Recent developments in Frequency Domain Fqualization (FDE) using Decision Feedback Equalization (DFE) have greatly improved the system based on the SC technique. This paper presents the comparison of two different variants of both OFDM and SCT techniques, namely OFDM-Cyclic Prefix (OFDM-CP), OFDM-Zero Padding (OFDM-ZP), SC-CP and SC-ZP. SC variants are simulated with Linear Equalizer(LE) and DFE. We have simulated all four techniques for different flat and frequency selective channels. A new block DFE structure is presented which iteratively improves itself and performs better as we increase the number of iterations. Comparison results for BER simulations of both variants of OFDM and SC with LE and DFE verify the supremacy of CP versions of SC-LE and SC-DFE over OFDM-CP and OFDM-ZP.
{"title":"A study of variable channel length for single carrier transmission with decision feedback equalizer","authors":"T. Khanzada, A. Ali, A. Omar","doi":"10.1109/RWS.2008.4463480","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463480","url":null,"abstract":"Single Carrier Transmission (SCT) is a competing technique for Orthogonal Frequency Division Multiplexing (OFDM) in Broadband Wireless Systems (BWS). Recent developments in Frequency Domain Fqualization (FDE) using Decision Feedback Equalization (DFE) have greatly improved the system based on the SC technique. This paper presents the comparison of two different variants of both OFDM and SCT techniques, namely OFDM-Cyclic Prefix (OFDM-CP), OFDM-Zero Padding (OFDM-ZP), SC-CP and SC-ZP. SC variants are simulated with Linear Equalizer(LE) and DFE. We have simulated all four techniques for different flat and frequency selective channels. A new block DFE structure is presented which iteratively improves itself and performs better as we increase the number of iterations. Comparison results for BER simulations of both variants of OFDM and SC with LE and DFE verify the supremacy of CP versions of SC-LE and SC-DFE over OFDM-CP and OFDM-ZP.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128416910","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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