Pub Date : 2008-03-05DOI: 10.1109/RWS.2008.4463517
J. Wilkerson, K. Gard, M. Steer
This paper presents an intermodulation distortion measurement system based on automated feedfoward cancellation that achieves 95 dB of broadband dynamic range. A single tone cancellation formula is developed requiring only the power of the probing signal and the power of the combined probe and cancellation signal to predict the required phase shift for cancellation. This formula is applied to a two path feedfoward cancellation system, combined with the DUT probe path in a bridge configuration. The dynamic range and cancellation capabilities of this system are confirmed by measuring the passive intermodulation distortion generated by a low PIM microwave chip termination. The cancellation method extends the intermodulation distortion measurement dynamic range by at least 20 dB.
{"title":"Wideband high dynamic range distortion measurement","authors":"J. Wilkerson, K. Gard, M. Steer","doi":"10.1109/RWS.2008.4463517","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463517","url":null,"abstract":"This paper presents an intermodulation distortion measurement system based on automated feedfoward cancellation that achieves 95 dB of broadband dynamic range. A single tone cancellation formula is developed requiring only the power of the probing signal and the power of the combined probe and cancellation signal to predict the required phase shift for cancellation. This formula is applied to a two path feedfoward cancellation system, combined with the DUT probe path in a bridge configuration. The dynamic range and cancellation capabilities of this system are confirmed by measuring the passive intermodulation distortion generated by a low PIM microwave chip termination. The cancellation method extends the intermodulation distortion measurement dynamic range by at least 20 dB.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"1 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":"125600783","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.2008.4463619
Yang Hong, Anand Srinivasan, B. Cheng, Leo Hartman, Peter Andreadis
Presently, multiple spot-beam satellites are being launched with the ability to allocate power dynamically and to increase throughput, because on-board resources (e.g., power, bandwidth) are scarce and expensive. It is critical to share them efficiently among as many users as possible. In this paper, we propose an innovative power allocation algorithm for the system. We use heuristic method to search the Lagrange multiplier and obtain the optimal power allocation for each spot beam in order to meet the total power constraint and individual SLA constraint together. Scilab simulation demonstrates that our algorithm maximizes the power utilization of the satellite successfully.
{"title":"Optimal power allocation for multiple beam satellite systems","authors":"Yang Hong, Anand Srinivasan, B. Cheng, Leo Hartman, Peter Andreadis","doi":"10.1109/RWS.2008.4463619","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463619","url":null,"abstract":"Presently, multiple spot-beam satellites are being launched with the ability to allocate power dynamically and to increase throughput, because on-board resources (e.g., power, bandwidth) are scarce and expensive. It is critical to share them efficiently among as many users as possible. In this paper, we propose an innovative power allocation algorithm for the system. We use heuristic method to search the Lagrange multiplier and obtain the optimal power allocation for each spot beam in order to meet the total power constraint and individual SLA constraint together. Scilab simulation demonstrates that our algorithm maximizes the power utilization of the satellite successfully.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"36 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":"125148264","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.2008.4463424
A. Raghavan, S. Chandramouli, E. Gebara, J. Laskar
A canceller is designed to suppress undesired interference in an 802.11b WLAN radio from a Bluetooth radiator operating close to it. The design utilizes 0.18 mum CMOS IC technology. The system consists of a core that emulates the interference-coupling channel between the two radios by time domain amplitude and phase alignment, and filtration. This is controlled by an adaptive loop. Using low noise design principles, the canceller core maintains a low output noise power spectral density of -173 dBm/Hz at the center frequency of the WLAN band. The consequent degradation of WLAN receiver sensitivity is 2.7 dB while achieving at least 15 dB of interference suppression. The canceller core dissipates 20 mW of power.
消除器设计用于抑制802.11b WLAN无线电中来自靠近它的蓝牙辐射器的不希望的干扰。本设计采用0.18 μ m CMOS集成电路技术。该系统由一个核心组成，该核心通过时域幅度和相位对准和滤波来模拟两个无线电之间的干扰耦合通道。这是由自适应回路控制的。采用低噪声设计原则，消除核心在WLAN频段中心频率处保持-173 dBm/Hz的低输出噪声功率谱密度。当实现至少15db的干扰抑制时，WLAN接收器灵敏度的随之下降为2.7 dB。抵消磁芯耗散了20兆瓦的功率。
{"title":"A low additive noise interference canceller for high sensitivity applications","authors":"A. Raghavan, S. Chandramouli, E. Gebara, J. Laskar","doi":"10.1109/RWS.2008.4463424","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463424","url":null,"abstract":"A canceller is designed to suppress undesired interference in an 802.11b WLAN radio from a Bluetooth radiator operating close to it. The design utilizes 0.18 mum CMOS IC technology. The system consists of a core that emulates the interference-coupling channel between the two radios by time domain amplitude and phase alignment, and filtration. This is controlled by an adaptive loop. Using low noise design principles, the canceller core maintains a low output noise power spectral density of -173 dBm/Hz at the center frequency of the WLAN band. The consequent degradation of WLAN receiver sensitivity is 2.7 dB while achieving at least 15 dB of interference suppression. The canceller core dissipates 20 mW of power.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"18 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":"123619015","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.2008.4463598
H. Kanaya, R. Nabeshima, R. Pokharel, K. Yoshida, M. Tsujii, R. Iino
We designed an electrically small antenna (ESA) with coplanar waveguide (CPW) matching circuit. Matching circuit is realized by using interdigital gap and transmission line. Our ESA has one-sided directivity for IMS band application. By using and controlling the length of floating metal layer on the bottom side, we can realize the one-sided radiation on the thinner substrate than that of the standard patch antenna. We also made experiments on the ESA with CPW matching circuit using patterned circuit board.
{"title":"Development of an electrically small one-sided directional antenna with matching circuit","authors":"H. Kanaya, R. Nabeshima, R. Pokharel, K. Yoshida, M. Tsujii, R. Iino","doi":"10.1109/RWS.2008.4463598","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463598","url":null,"abstract":"We designed an electrically small antenna (ESA) with coplanar waveguide (CPW) matching circuit. Matching circuit is realized by using interdigital gap and transmission line. Our ESA has one-sided directivity for IMS band application. By using and controlling the length of floating metal layer on the bottom side, we can realize the one-sided radiation on the thinner substrate than that of the standard patch antenna. We also made experiments on the ESA with CPW matching circuit using patterned circuit board.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"14 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":"121643414","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.2008.4463553
T. Duong, H. Tran
In this paper, we generalize the construction of distributed space-time block codes (DSTBCs) using amicable orthogonal designs which are originally applied to co-located multiple-antenna systems. We also derive the closed-form expression of average symbol error probability (SEP). The result is obtained in the form of single finite-range integral whose integrand contains only the trigonometric functions. Using the asymptotic (high signal-to-noise ratio) SEP formulas we show that the orthogonal DSTBCs achieve full diversity order. We also perform Monte-Carlo simulation to validate the analysis.
{"title":"Distributed space-time block codes with amicable orthogonal designs","authors":"T. Duong, H. Tran","doi":"10.1109/RWS.2008.4463553","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463553","url":null,"abstract":"In this paper, we generalize the construction of distributed space-time block codes (DSTBCs) using amicable orthogonal designs which are originally applied to co-located multiple-antenna systems. We also derive the closed-form expression of average symbol error probability (SEP). The result is obtained in the form of single finite-range integral whose integrand contains only the trigonometric functions. Using the asymptotic (high signal-to-noise ratio) SEP formulas we show that the orthogonal DSTBCs achieve full diversity order. We also perform Monte-Carlo simulation to validate the analysis.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"10 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":"125251352","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.2008.4463476
M. Kataoka, T. Ishikawa, S. Hanaoka, M. Yano, S. Nishimura
Cognitive radio system consists of multiple wireless accesses that cover overlapping area, and cognitive terminals that use one or more of the wireless accesses simultaneously. In this paper, we present the architecture of the cognitive radio system that we proposed. In the proposed architecture, each cognitive terminal, that has multiple radio systems, operates with a single local IP address. Based on the proposed architecture, we have developed a simulator with EVDO, WiMAX and wireless LAN, and evaluated inter cognitive base station handover. From a result of simulation, it was found that it took 66 msec for the beginning of handover to the end.
{"title":"Evaluation of inter base station handover for cognitive radio","authors":"M. Kataoka, T. Ishikawa, S. Hanaoka, M. Yano, S. Nishimura","doi":"10.1109/RWS.2008.4463476","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463476","url":null,"abstract":"Cognitive radio system consists of multiple wireless accesses that cover overlapping area, and cognitive terminals that use one or more of the wireless accesses simultaneously. In this paper, we present the architecture of the cognitive radio system that we proposed. In the proposed architecture, each cognitive terminal, that has multiple radio systems, operates with a single local IP address. Based on the proposed architecture, we have developed a simulator with EVDO, WiMAX and wireless LAN, and evaluated inter cognitive base station handover. From a result of simulation, it was found that it took 66 msec for the beginning of handover to the end.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"18 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":"125651532","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.2008.4463477
Jiann-Liang Chen, Y. Lai, Hsi-Feng Lu, Quan-Cheng Kuo
Wireless sensor nodes have restricted computational resources, and are always deployed in a harsh, unattended or hostile environment. Therefore, network security represents a challenging task. This work presents a public-key based pre-distribution scheme with time-position nodes for simultaneous exchange of secure keys. The proposed defend attack and key management mechanism for sensor network applications can successfully handle sink mobility and can continually deliver data to neighboring nodes and sinks. Simulation results indicate that the proposed mechanism can reduce energy consumption and extend the average network lifetime by about 25%.
{"title":"Public-key based security scheme for Wireless Sensor Network","authors":"Jiann-Liang Chen, Y. Lai, Hsi-Feng Lu, Quan-Cheng Kuo","doi":"10.1109/RWS.2008.4463477","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463477","url":null,"abstract":"Wireless sensor nodes have restricted computational resources, and are always deployed in a harsh, unattended or hostile environment. Therefore, network security represents a challenging task. This work presents a public-key based pre-distribution scheme with time-position nodes for simultaneous exchange of secure keys. The proposed defend attack and key management mechanism for sensor network applications can successfully handle sink mobility and can continually deliver data to neighboring nodes and sinks. Simulation results indicate that the proposed mechanism can reduce energy consumption and extend the average network lifetime by about 25%.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"62 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":"124691587","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.2008.4463443
P. Yaddanapudi, G. Raju, D. Popescu
In this paper we discuss exploiting multiuser diversity and adaptive modulation in conjunction with spectral load smoothing (SLS) as a medium access control protocol for spectrum agile radios (SAR) in a multiuser OFDM/OFDMA based wireless communication system operating in frequency selective fading channel. The ability of the spectrum agile radios to identify unused spectrum can be used effectively to assign sub- carriers and bits adaptively depending on the user's channel state information in a distributed fashion. We illustrate by simulation the performance improvement in terms of the bit error rate obtained for a multiuser OFDM system when multiuser diversity and adaptive bit loading is used in combination with SLS.
{"title":"Multiuser diversity and adaptive bit loading for OFDM-based spectrum agile radios","authors":"P. Yaddanapudi, G. Raju, D. Popescu","doi":"10.1109/RWS.2008.4463443","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463443","url":null,"abstract":"In this paper we discuss exploiting multiuser diversity and adaptive modulation in conjunction with spectral load smoothing (SLS) as a medium access control protocol for spectrum agile radios (SAR) in a multiuser OFDM/OFDMA based wireless communication system operating in frequency selective fading channel. The ability of the spectrum agile radios to identify unused spectrum can be used effectively to assign sub- carriers and bits adaptively depending on the user's channel state information in a distributed fashion. We illustrate by simulation the performance improvement in terms of the bit error rate obtained for a multiuser OFDM system when multiuser diversity and adaptive bit loading is used in combination with SLS.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"18 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120844364","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.2008.4463600
Song Lin, A. Fathy, G. Hegazi, T.T. Chu
A novel wide band high power recycling approach has been developed. The design is optimized for high efficiency, high isolation, and minimal number of ferrite cores. The combiner part includes an effective flux canceling circuitry to significantly improve its inter-modulation distortion performance, and the isolating resistors can be replaced by an efficient RF to DC conversion circuitry. The recycling combiner has been successfully fabricated, tested, and full performance evaluation have been carried out. This combiner allows portion of the wasted components of the signal to be reused by the power supply; thus the over all efficiency of the wide band outphasing power amplifier can be improved.
{"title":"Multi-octave high power recycling combiner using coaxial line to improve overall efficiency of outphasing power amplifier","authors":"Song Lin, A. Fathy, G. Hegazi, T.T. Chu","doi":"10.1109/RWS.2008.4463600","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463600","url":null,"abstract":"A novel wide band high power recycling approach has been developed. The design is optimized for high efficiency, high isolation, and minimal number of ferrite cores. The combiner part includes an effective flux canceling circuitry to significantly improve its inter-modulation distortion performance, and the isolating resistors can be replaced by an efficient RF to DC conversion circuitry. The recycling combiner has been successfully fabricated, tested, and full performance evaluation have been carried out. This combiner allows portion of the wasted components of the signal to be reused by the power supply; thus the over all efficiency of the wide band outphasing power amplifier can be improved.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"110 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":"114994785","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.2008.4463514
D. Prikhodko, J. Mason, C. Wei, A. Klimashov, G. Zhou, Y. Tkachenko, S. Sprinkle, R. Carter, S. Nabokin, J. Chiesa
A highly linear 9 throw switch for GSM/WCDMA applications with an IMD2/3 of -105 dBm at the control voltages starting as low as 2.8/0 V has been successfully developed. This high linearity performance was achieved using a backside bias technique which does not degrade the power handling capability of the device resulting in the harmonics performance below -35 dBm for VSWR 5:1 at the control voltages 3.2/0 V and TX/TRX losses below 0.9 dB at 2GHz.
{"title":"Enhanced linearity technique for multithrow TX/RX switches.","authors":"D. Prikhodko, J. Mason, C. Wei, A. Klimashov, G. Zhou, Y. Tkachenko, S. Sprinkle, R. Carter, S. Nabokin, J. Chiesa","doi":"10.1109/RWS.2008.4463514","DOIUrl":"https://doi.org/10.1109/RWS.2008.4463514","url":null,"abstract":"A highly linear 9 throw switch for GSM/WCDMA applications with an IMD2/3 of -105 dBm at the control voltages starting as low as 2.8/0 V has been successfully developed. This high linearity performance was achieved using a backside bias technique which does not degrade the power handling capability of the device resulting in the harmonics performance below -35 dBm for VSWR 5:1 at the control voltages 3.2/0 V and TX/TRX losses below 0.9 dB at 2GHz.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"62 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":"128899222","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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