Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434267
H. Zhu, J. Sydor
Media access protocols define network performance in WLAN/WMAN systems. Such wireless networks are generally short range and use the CSMA (Carrier Sense Multiple Access) protocol which forms the basis to the ubiquitous IEEE 802.11 standard. In this paper we examine the behavior of a hybrid CSMA protocol called the “busy-tone protocol” which uses a dedicated physical channel to indicate media availability to a highly distributed, wide ranging (3–48 km) hidden set of mobile users. Using the busy tone to gate the radios, we force the radio link into a time domain duplex-like operation with the downlink channel consisting of scheduled concatenated bursts, effectively bypassing the CSMA, while the uplink channel still employs CSMA-like operation. The focus of the simulations is to understand performance of the proposed approach in long range, low S/N scenarios, and consider a hybrid IEEE 802.11 solution that would have improved performance compared to traditional applications of the standard.
{"title":"Throughput performance of a busy-tone protocol in CCA modified, long range IEEE 802.11 networks","authors":"H. Zhu, J. Sydor","doi":"10.1109/RWS.2010.5434267","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434267","url":null,"abstract":"Media access protocols define network performance in WLAN/WMAN systems. Such wireless networks are generally short range and use the CSMA (Carrier Sense Multiple Access) protocol which forms the basis to the ubiquitous IEEE 802.11 standard. In this paper we examine the behavior of a hybrid CSMA protocol called the “busy-tone protocol” which uses a dedicated physical channel to indicate media availability to a highly distributed, wide ranging (3–48 km) hidden set of mobile users. Using the busy tone to gate the radios, we force the radio link into a time domain duplex-like operation with the downlink channel consisting of scheduled concatenated bursts, effectively bypassing the CSMA, while the uplink channel still employs CSMA-like operation. The focus of the simulations is to understand performance of the proposed approach in long range, low S/N scenarios, and consider a hybrid IEEE 802.11 solution that would have improved performance compared to traditional applications of the standard.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121636678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434116
J. Kunze, A. Bilgic, J. Hausner
Long Term Evolution (LTE) is the improvement of the 3G W-CDMA system and offers higher system capacity while being more robust against multipath fading. For this purpose it features several multiple antenna schemes. Receive diversity is a mandatory multiple antenna scheme. This paper proposes an architecture for receive diversity which significantly reduces the power consumption compared to conventional approaches. Depending on the environment it has a similar performance as maximum ratio combining while delivering a power saving of 30% in the radio frontend and allowing even better power reduction on system level. Minor modifications have to be made at the radio frontend. The performance of the proposed architecture is evaluated in multipath fading channels in terms of bit error rates.
{"title":"Adaptive low power receive diversity for LTE","authors":"J. Kunze, A. Bilgic, J. Hausner","doi":"10.1109/RWS.2010.5434116","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434116","url":null,"abstract":"Long Term Evolution (LTE) is the improvement of the 3G W-CDMA system and offers higher system capacity while being more robust against multipath fading. For this purpose it features several multiple antenna schemes. Receive diversity is a mandatory multiple antenna scheme. This paper proposes an architecture for receive diversity which significantly reduces the power consumption compared to conventional approaches. Depending on the environment it has a similar performance as maximum ratio combining while delivering a power saving of 30% in the radio frontend and allowing even better power reduction on system level. Minor modifications have to be made at the radio frontend. The performance of the proposed architecture is evaluated in multipath fading channels in terms of bit error rates.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":" 41","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113947854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434154
M. Mercanti, A. Cidronali, I. Magrini, G. Manes
This paper focuses a GaN HEMT power amplifier with 1-bit power control and provides experimental data. It relies on a new concept of power combining allowed by an adaptive gate bias control scheme. At 2.1 GHz CW the discrete power control technique enables a linear factor 3.3 efficiency enhancement at the maximum power back-off of 7 dB, while a maximum output power of 34 dBm and a peak drain efficiency of 35%.
{"title":"A 2.14 GHz GaN power amplifier with 1-bit discrete power control","authors":"M. Mercanti, A. Cidronali, I. Magrini, G. Manes","doi":"10.1109/RWS.2010.5434154","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434154","url":null,"abstract":"This paper focuses a GaN HEMT power amplifier with 1-bit power control and provides experimental data. It relies on a new concept of power combining allowed by an adaptive gate bias control scheme. At 2.1 GHz CW the discrete power control technique enables a linear factor 3.3 efficiency enhancement at the maximum power back-off of 7 dB, while a maximum output power of 34 dBm and a peak drain efficiency of 35%.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124340015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434213
Depeng Yang, A. Fathy, Husheng Li, M. Mahfouz, G. D. Peterson
A compact sequential sampling scheme using a high sampling rate analog digital converter (ADC) and direct digital synthesis (DDS) technology has been proposed for the millimeter accuracy UWB positioning system, which can achieve the equivalent of a 100GHz sampling rate. The analog bandwidth, frequency resolution, and time jitter of the sampler for UWB signal acquisitions are detailed. Based on the sampled UWB signal, a modified correlation algorithm for time difference estimation is proposed to further improve positioning accuracy and reduce the computational burden. Simulation results based on IEEE802.15.4a channel models and experiments utilizing the proposed sub-sampler show that our UWB positioning system can achieve up to millimeter accuracy.
{"title":"Millimeter accuracy UWB positioning system using sequential sub-sampler and time difference estimation algorithm","authors":"Depeng Yang, A. Fathy, Husheng Li, M. Mahfouz, G. D. Peterson","doi":"10.1109/RWS.2010.5434213","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434213","url":null,"abstract":"A compact sequential sampling scheme using a high sampling rate analog digital converter (ADC) and direct digital synthesis (DDS) technology has been proposed for the millimeter accuracy UWB positioning system, which can achieve the equivalent of a 100GHz sampling rate. The analog bandwidth, frequency resolution, and time jitter of the sampler for UWB signal acquisitions are detailed. Based on the sampled UWB signal, a modified correlation algorithm for time difference estimation is proposed to further improve positioning accuracy and reduce the computational burden. Simulation results based on IEEE802.15.4a channel models and experiments utilizing the proposed sub-sampler show that our UWB positioning system can achieve up to millimeter accuracy.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130116017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434248
Chun-Chi Lin, Chia-Chan Chang, Sheng-Chi Hsieh
In this paper, we present a compact CMOS chip antenna for on-chip radios. The proposed antenna is constructed by single unit-cell of composite right/left-handed transmission line. According to the zeroth-order resonance, the antenna size is determined by the equivalent lumped circuit elements instead of the wavelength, leading to the beneficial size reduction. The antenna is fabricated using 0.35-µm CMOS-MEMS technology with partial substrate removal for gain enhancement. The antenna size is 0.74×0.32 mm2, and the overall chip size is 1.18×0.74 mm2 with dummy metals. The measured return loss is 6 dB at 40 GHz and the measured radiation gain estimated by Friis' transmission formula is −16.75 dBi.
{"title":"Design of 40-GHz CRLH-TL chip antenna using 0.35-µm CMOS-MEMS technology","authors":"Chun-Chi Lin, Chia-Chan Chang, Sheng-Chi Hsieh","doi":"10.1109/RWS.2010.5434248","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434248","url":null,"abstract":"In this paper, we present a compact CMOS chip antenna for on-chip radios. The proposed antenna is constructed by single unit-cell of composite right/left-handed transmission line. According to the zeroth-order resonance, the antenna size is determined by the equivalent lumped circuit elements instead of the wavelength, leading to the beneficial size reduction. The antenna is fabricated using 0.35-µm CMOS-MEMS technology with partial substrate removal for gain enhancement. The antenna size is 0.74×0.32 mm2, and the overall chip size is 1.18×0.74 mm2 with dummy metals. The measured return loss is 6 dB at 40 GHz and the measured radiation gain estimated by Friis' transmission formula is −16.75 dBi.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115527712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434257
Y. Soliman, R. Mason
A frequency multiplication based LO phase shifting technique is presented for use in phased-array front end architectures operating in the ISM band at 24GHz. The presented architecture employs a two-stage phase shifter, a high-speed comparator and a Q-enhanced tuned amplifier to synthesize 18GHz tones from a 2GHz reference. The synthesized tones are used to injection lock 18GHz LC-oscillators in close proximity to the RF/mm-w front-ends in a phased-array system. A digital means for phase shift calibration is discussed. Implemented in IBM's 120 nm CMOS technology, the proposed architecture consumes 14.2mW from a 1.2V supply. The oscillator core consumes 3.7mW. The maximum phase shift errors at 18GHz is 5° and 0.79° before and after calibration, respectively.
{"title":"A frequency multiplication based LO phase shifting technique for phased-array architectures","authors":"Y. Soliman, R. Mason","doi":"10.1109/RWS.2010.5434257","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434257","url":null,"abstract":"A frequency multiplication based LO phase shifting technique is presented for use in phased-array front end architectures operating in the ISM band at 24GHz. The presented architecture employs a two-stage phase shifter, a high-speed comparator and a Q-enhanced tuned amplifier to synthesize 18GHz tones from a 2GHz reference. The synthesized tones are used to injection lock 18GHz LC-oscillators in close proximity to the RF/mm-w front-ends in a phased-array system. A digital means for phase shift calibration is discussed. Implemented in IBM's 120 nm CMOS technology, the proposed architecture consumes 14.2mW from a 1.2V supply. The oscillator core consumes 3.7mW. The maximum phase shift errors at 18GHz is 5° and 0.79° before and after calibration, respectively.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128303764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434126
Jet'aime Lowe, H. Nie, Z. Chen
We have recently proposed the Code-shifted-reference impulse UWB radio that overcomes the technical challenges encountered by other UWB systems. Further to our previous work, this paper presents a transmitter structure which implements the Code-Shifted Reference UWB transmission scheme. The transmitter is shown to operate in the lower UWB spectrum (3–5GHz), with a center frequency of 4.44GHz. It generates a 4ns pulse which is in accordance with the FCC recommendations.
{"title":"A Code-Shifted Reference impulse radio ultra-wideband (IR-UWB) transmitter","authors":"Jet'aime Lowe, H. Nie, Z. Chen","doi":"10.1109/RWS.2010.5434126","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434126","url":null,"abstract":"We have recently proposed the Code-shifted-reference impulse UWB radio that overcomes the technical challenges encountered by other UWB systems. Further to our previous work, this paper presents a transmitter structure which implements the Code-Shifted Reference UWB transmission scheme. The transmitter is shown to operate in the lower UWB spectrum (3–5GHz), with a center frequency of 4.44GHz. It generates a 4ns pulse which is in accordance with the FCC recommendations.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128201551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434136
K. Vaesen, R. Jansen, W. De Raedt, H. Kuwabara, Takahiko Kishi, Kazunari Nawa, Takeshi Bessho
In this work a RF component design library has been developed for high performance 6-layered PCBs using a new plating technology. The design library consists of scalable models that are fitted on measurements. It is shown that the high performance PCB exhibits a better transmission line RF performance and also higher Q values for integrated inductors.
{"title":"RF passives modeling for a multilayer PCB design library","authors":"K. Vaesen, R. Jansen, W. De Raedt, H. Kuwabara, Takahiko Kishi, Kazunari Nawa, Takeshi Bessho","doi":"10.1109/RWS.2010.5434136","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434136","url":null,"abstract":"In this work a RF component design library has been developed for high performance 6-layered PCBs using a new plating technology. The design library consists of scalable models that are fitted on measurements. It is shown that the high performance PCB exhibits a better transmission line RF performance and also higher Q values for integrated inductors.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128622847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434272
I. Haroun, J. Wight, C. Plett, A. Fathy
A radio-over-fiber RF front end is being developed for multi-band operation covering 700 MHz, 2.4 GHz and 60 GHz. The RF front-end of the system was implemented on FR4 substrate and the optical part of the system was implemented using commercial components. Initially, a 700 MHz system based on 2.4GHz WLAN was demonstrated and achieved a 6-Mbps data rate transmission over a 4-km optical link and a 2.5-meter wireless link with transmit power of only 1mW at the base station. Meanwhile, various blocks for the 60 GHz band require further development, and an example of our efforts is a low noise amplifier (LNA) that was designed and developed in CMOS technology, the amplifier achieved noise figure less than 5 dB and a gain of 10 dB over 8 GHz bandwidth covering the frequency range of 50–58GHz and will be presented here. These developed components are well suited for RF front-ends in radio-over-fiber (RoF) communication systems.
{"title":"Multi-band 700MHz/ 2.4GHz/ 60GHz RF front-end for radio-over-fiber base stations","authors":"I. Haroun, J. Wight, C. Plett, A. Fathy","doi":"10.1109/RWS.2010.5434272","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434272","url":null,"abstract":"A radio-over-fiber RF front end is being developed for multi-band operation covering 700 MHz, 2.4 GHz and 60 GHz. The RF front-end of the system was implemented on FR4 substrate and the optical part of the system was implemented using commercial components. Initially, a 700 MHz system based on 2.4GHz WLAN was demonstrated and achieved a 6-Mbps data rate transmission over a 4-km optical link and a 2.5-meter wireless link with transmit power of only 1mW at the base station. Meanwhile, various blocks for the 60 GHz band require further development, and an example of our efforts is a low noise amplifier (LNA) that was designed and developed in CMOS technology, the amplifier achieved noise figure less than 5 dB and a gain of 10 dB over 8 GHz bandwidth covering the frequency range of 50–58GHz and will be presented here. These developed components are well suited for RF front-ends in radio-over-fiber (RoF) communication systems.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128668043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434093
M. Bellanger
Future broadband radio systems have ambitious objectives in terms of performance and quality of service. Moreover, new network topologies are likely to be introduced. Therefore, the physical layer has to evolve to meet the new requirements. With this in mind, the filter bank multicarrier (FBMC) technique is proposed as an enhancement to the present OFDM technique. After a brief presentation of the FBMC principle, the adaptation to the radio context is described. Then, the main features which impact radio networks are reviewed with emphasis on the potential benefits of the evolution. The paper provides an overview of the work carried out in the European research project EC-FP7-Phydyas (physical layer for dynamic access and cognitive radio).
{"title":"Physical layer for future broadband radio systems","authors":"M. Bellanger","doi":"10.1109/RWS.2010.5434093","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434093","url":null,"abstract":"Future broadband radio systems have ambitious objectives in terms of performance and quality of service. Moreover, new network topologies are likely to be introduced. Therefore, the physical layer has to evolve to meet the new requirements. With this in mind, the filter bank multicarrier (FBMC) technique is proposed as an enhancement to the present OFDM technique. After a brief presentation of the FBMC principle, the adaptation to the radio context is described. Then, the main features which impact radio networks are reviewed with emphasis on the potential benefits of the evolution. The paper provides an overview of the work carried out in the European research project EC-FP7-Phydyas (physical layer for dynamic access and cognitive radio).","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129918862","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：