Pub Date : 2010-01-10DOI: 10.1109/RWS.2010.5434114
F. Raab, M. C. Poppe
This Kahn-technique (Envelope Elimination and Restoration) transmitter operates at 1.2 GHz and produces a PEP output of 50 W. It employs a GaN-HEMT class-F RF-power amplifier, class-S modulators, and a digital signal processor. An overall (driver + final) efficiency of 50 percent or more is maintained over the top 6 dB of the output range. The driver and final are operated to maximize overall efficiency and the predistortion corrects for amplitude and phase errors. While originally intended for pulsed radar applications, the transmitter is capable of producing a wide variety of signals with good linearity and average efficiency.
{"title":"Kahn-technique transmitter for L-band communication/radar","authors":"F. Raab, M. C. Poppe","doi":"10.1109/RWS.2010.5434114","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434114","url":null,"abstract":"This Kahn-technique (Envelope Elimination and Restoration) transmitter operates at 1.2 GHz and produces a PEP output of 50 W. It employs a GaN-HEMT class-F RF-power amplifier, class-S modulators, and a digital signal processor. An overall (driver + final) efficiency of 50 percent or more is maintained over the top 6 dB of the output range. The driver and final are operated to maximize overall efficiency and the predistortion corrects for amplitude and phase errors. While originally intended for pulsed radar applications, the transmitter is capable of producing a wide variety of signals with good linearity and average efficiency.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"29 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":"126903197","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.2010.5434188
Haifeng Xiao, Y. Shi, W. Su, J. Kosinski
This paper presents an effective carrier frequency estimation algorithm for adaptive demodulation of SSB-SC signals based on software defined radios. Higher-order moments are used for accurate carrier frequency estimation without a priori physical layer knowledge or a pilot tone associated with the received signal. Experiment results demonstrate the good performance of the algorithm.
{"title":"Blind carrier frequency estimation for SSB-SC signals","authors":"Haifeng Xiao, Y. Shi, W. Su, J. Kosinski","doi":"10.1109/RWS.2010.5434188","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434188","url":null,"abstract":"This paper presents an effective carrier frequency estimation algorithm for adaptive demodulation of SSB-SC signals based on software defined radios. Higher-order moments are used for accurate carrier frequency estimation without a priori physical layer knowledge or a pilot tone associated with the received signal. Experiment results demonstrate the good performance of the algorithm.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"10 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":"123272661","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.2010.5434180
Yan Yan, Changzhi Li, Jenshan Lin
In this paper, the effect of I/Q mismatch in a 5.8 GHz direct-conversion quadrature Doppler radar sensor detecting periodic movement is studied. The measured movement amplitude under specific I/Q amplitude or phase mismatch is affected by the residual phase, which is determined by the nominal distance from the target to the antenna. It was found that there exist optimal residual phases minimizing the degradation of detection accuracy caused by amplitude and phase mismatches. Experiments were conducted to verify the theory.
{"title":"Effects of I/Q mismatch on measurement of periodic movement using a Doppler radar sensor","authors":"Yan Yan, Changzhi Li, Jenshan Lin","doi":"10.1109/RWS.2010.5434180","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434180","url":null,"abstract":"In this paper, the effect of I/Q mismatch in a 5.8 GHz direct-conversion quadrature Doppler radar sensor detecting periodic movement is studied. The measured movement amplitude under specific I/Q amplitude or phase mismatch is affected by the residual phase, which is determined by the nominal distance from the target to the antenna. It was found that there exist optimal residual phases minimizing the degradation of detection accuracy caused by amplitude and phase mismatches. Experiments were conducted to verify the theory.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"158 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":"116234676","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.2010.5434205
E. E. Djoumessi, K. Wu
A reconfigurable direct conversion receiver front-end for GSM and WLAN bands (1.9 and 2.4 GHz) is proposed and demonstrated for cognitive radio system applications. The RF front-end platform makes use of a silicon varactor-tuned bandpass filter in connection with a tunable six-port demodulator. Varactor diodes of both of the tunable structures are independently biased using two different sets of supply voltage. The demodulation of phase-shift-keying (PSK) signals at a bit rate of 40 Mbps is achieved by using wideband power detectors. An experimental test bench of the proposed receiver is realized, and QPSK and 8PSK signal constellations are measured at the center-operating frequencies of 1.9 and 2.4 GHz for different noise levels.
{"title":"Reconfigurable RF front-end for frequency-agile direct conversion receivers and cognitive radio system applications","authors":"E. E. Djoumessi, K. Wu","doi":"10.1109/RWS.2010.5434205","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434205","url":null,"abstract":"A reconfigurable direct conversion receiver front-end for GSM and WLAN bands (1.9 and 2.4 GHz) is proposed and demonstrated for cognitive radio system applications. The RF front-end platform makes use of a silicon varactor-tuned bandpass filter in connection with a tunable six-port demodulator. Varactor diodes of both of the tunable structures are independently biased using two different sets of supply voltage. The demodulation of phase-shift-keying (PSK) signals at a bit rate of 40 Mbps is achieved by using wideband power detectors. An experimental test bench of the proposed receiver is realized, and QPSK and 8PSK signal constellations are measured at the center-operating frequencies of 1.9 and 2.4 GHz for different noise levels.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"50 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":"116721603","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.2010.5434175
L. Aluigi, F. Alimenti, L. Roselli
Radiometers are sophisticated sensors commonly in use since decades in different fields, among the others: radioastronomy, meteorology and remote sensing from satellite. Being a sort of noise temperature eye, the radiometer can be applied, in principle, to a huge variety of observations, nevertheless its exploitation has been limited so far by the cost of the technology required. The most of the existing apparatuses in fact are actually based on waveguide or hybrid technology in combination with 3D antennas; it poses severe constraints in terms of cost, dimension, weight and mass production possibilities and ultimately applicablity. Nowadays, the strong increment of the operating frequencies of even low cost IC technologies, such as CMOS with cut off frequencies far beyond 100 GHz, allows us to look at radiometers from a different and wider perspective.
{"title":"Fully integrated millimeter-wave radiometers: Development level and perspectives","authors":"L. Aluigi, F. Alimenti, L. Roselli","doi":"10.1109/RWS.2010.5434175","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434175","url":null,"abstract":"Radiometers are sophisticated sensors commonly in use since decades in different fields, among the others: radioastronomy, meteorology and remote sensing from satellite. Being a sort of noise temperature eye, the radiometer can be applied, in principle, to a huge variety of observations, nevertheless its exploitation has been limited so far by the cost of the technology required. The most of the existing apparatuses in fact are actually based on waveguide or hybrid technology in combination with 3D antennas; it poses severe constraints in terms of cost, dimension, weight and mass production possibilities and ultimately applicablity. Nowadays, the strong increment of the operating frequencies of even low cost IC technologies, such as CMOS with cut off frequencies far beyond 100 GHz, allows us to look at radiometers from a different and wider perspective.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"21 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":"131750611","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.2010.5434233
J. Wu, R. Ye, T. Horng
A 2.6 GHz Gilbert mixer-based downconverter RFIC is designed and implemented in a 0.15 µm InGaAs pseudomorphic high electron mobility transistor (pHEMT) foundry process. A crucial goal for the design is to achieve high input second-order intercept point (IIP2) that is required in a direct-conversion WiMAX receiver. The adaptive biasing at the switching stage of this downconverter is used to compensate the unbalance of the input LO signals for improving the IIP2. The technique presented here enhances the IIP2 by 18.8 dBm without at the expense of reducing the conversion gain.
{"title":"A high IIP2 Gilbert mixer-based downconverter design for direct-conversion WiMAX receivers","authors":"J. Wu, R. Ye, T. Horng","doi":"10.1109/RWS.2010.5434233","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434233","url":null,"abstract":"A 2.6 GHz Gilbert mixer-based downconverter RFIC is designed and implemented in a 0.15 µm InGaAs pseudomorphic high electron mobility transistor (pHEMT) foundry process. A crucial goal for the design is to achieve high input second-order intercept point (IIP2) that is required in a direct-conversion WiMAX receiver. The adaptive biasing at the switching stage of this downconverter is used to compensate the unbalance of the input LO signals for improving the IIP2. The technique presented here enhances the IIP2 by 18.8 dBm without at the expense of reducing the conversion gain.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"29 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":"127782602","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.2010.5434148
Y. S. Jeong, Sang Heun Lee, J. Yoon, Won Yong Lee, Woo-Young Choi, Y. Yoon
An internal mobile antenna covering multiband for LTE (746 – 806 MHz), GSM850 (824 – 894 MHz), GSM900 (880 – 960 MHz), PCS1900 (1850 – 1990 MHz), WiMAX (3.4 – 3.6 GHz) and WLAN (5.15 – 5.85 GHz) frequency bands is proposed. In order to satisfy the operation at WLAN frequency band, a metal branch is placed near the feeding point. It is shown that the operation at low frequency bands (LTE / GSM850 / GSM900) can be achieved by increasing the length of the ground. Considering the size of the commercial mobile phones, more practical design which exhibits the similar effect that can be attained by increasing the length of the ground is proposed. The antenna was fabricated and its measured results of return loss and radiation patterns at each frequency bands are presented. FR4 substrate with relative permittivity of 4.4 was used. The overall size of the proposed antenna is 40 × 100 × 5 mm3.
{"title":"Internal mobile antenna for LTE / GSM850 / GSM900 / PCS1900 / WiMAX / WLAN","authors":"Y. S. Jeong, Sang Heun Lee, J. Yoon, Won Yong Lee, Woo-Young Choi, Y. Yoon","doi":"10.1109/RWS.2010.5434148","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434148","url":null,"abstract":"An internal mobile antenna covering multiband for LTE (746 – 806 MHz), GSM850 (824 – 894 MHz), GSM900 (880 – 960 MHz), PCS1900 (1850 – 1990 MHz), WiMAX (3.4 – 3.6 GHz) and WLAN (5.15 – 5.85 GHz) frequency bands is proposed. In order to satisfy the operation at WLAN frequency band, a metal branch is placed near the feeding point. It is shown that the operation at low frequency bands (LTE / GSM850 / GSM900) can be achieved by increasing the length of the ground. Considering the size of the commercial mobile phones, more practical design which exhibits the similar effect that can be attained by increasing the length of the ground is proposed. The antenna was fabricated and its measured results of return loss and radiation patterns at each frequency bands are presented. FR4 substrate with relative permittivity of 4.4 was used. The overall size of the proposed antenna is 40 × 100 × 5 mm3.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"40 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":"133177858","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.2010.5434244
Song Lin, M. Eron
A three-stage power amplifier will be described which was designed for 5W or better power over many octaves. A mixed topology was chosen to obtain the best bandwidth and power. First two stages are single-ended feedback designs for best gain and linear drive for the output. The last stage is a distributed PA, which is optimized to achieve high output power and high drain efficiency. The PA is designed and fabricated using discrete 2W GaN transistor die in all stages in a mixed hybrid and softboard medium. The design was fully simulated. Both measurement results and the theoretical predictions will be presented. This GaN PA has over 43 dB linear gain with good port match and it provides greater than 37 dBm of saturated power and over 20% PAE in the 0.02 to 3 GHz frequency range.
{"title":"Ultra wideband high gain GaN power amplifier","authors":"Song Lin, M. Eron","doi":"10.1109/RWS.2010.5434244","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434244","url":null,"abstract":"A three-stage power amplifier will be described which was designed for 5W or better power over many octaves. A mixed topology was chosen to obtain the best bandwidth and power. First two stages are single-ended feedback designs for best gain and linear drive for the output. The last stage is a distributed PA, which is optimized to achieve high output power and high drain efficiency. The PA is designed and fabricated using discrete 2W GaN transistor die in all stages in a mixed hybrid and softboard medium. The design was fully simulated. Both measurement results and the theoretical predictions will be presented. This GaN PA has over 43 dB linear gain with good port match and it provides greater than 37 dBm of saturated power and over 20% PAE in the 0.02 to 3 GHz frequency range.","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":"130315535","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.2010.5434169
Hanwen Cao, C. Konig, A. Wilzeck, M.-D. Perez Guirao
Cognitive radio is a well motivated concept for improving the inefficient spectrum utilization and apparent scarcity that result from traditional spectral regulations. So far, most efforts in the cognitive radio research field focus on techniques for the enhancement of the amount of available spectrum under the stringent constraint of causing no harmful interference to legacy users. But communication reliability also can substantially benefit from the cognitive radio approach by means of agile utilization of transmission opportunities in frequency, time and space. In this paper, we present our Cognitive Agile Networking (CAN) framework that aims at achieving robust low-latency communications by introducing agility in frequency, time and space as well as learning and reasoning for optimizing network operations. In order to respect practical issues of real-world applications, we are building a Cognitive Agile Spectrum Testbed (COAST) for experiments and validations. An initial version of this testbed is introduced here and its spectral agility is demonstrated.
{"title":"Cognitive Agile Networking testbed","authors":"Hanwen Cao, C. Konig, A. Wilzeck, M.-D. Perez Guirao","doi":"10.1109/RWS.2010.5434169","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434169","url":null,"abstract":"Cognitive radio is a well motivated concept for improving the inefficient spectrum utilization and apparent scarcity that result from traditional spectral regulations. So far, most efforts in the cognitive radio research field focus on techniques for the enhancement of the amount of available spectrum under the stringent constraint of causing no harmful interference to legacy users. But communication reliability also can substantially benefit from the cognitive radio approach by means of agile utilization of transmission opportunities in frequency, time and space. In this paper, we present our Cognitive Agile Networking (CAN) framework that aims at achieving robust low-latency communications by introducing agility in frequency, time and space as well as learning and reasoning for optimizing network operations. In order to respect practical issues of real-world applications, we are building a Cognitive Agile Spectrum Testbed (COAST) for experiments and validations. An initial version of this testbed is introduced here and its spectral agility is demonstrated.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"57 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":"132411100","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.2010.5434219
M. Masood, C. Rey, S. Kenney, G. Norris, R. Sherman
This paper presents a scheme of modeling radio frequency (RF) power amplifier (PAs) for 3-port applications by including modeling of bias port of PA along with its input and output ports. This scheme uses polynomials with infinite impulse response (IIR) bases functions for modeling non-linear behavior of PA as well as its short and long term memory effects. Power amplifiers designed for third generation (WCDMA) wireless system are investigated for the validation of modeling scheme. Excellent results are obtained, where the error between model prediction and measurements is better than 43 dBc for a wide range of bias voltages, with the amplifier being driven with a WCDMA signal at several power levels.
{"title":"RF power amplifier modeling for three-port applications using polynomials with IIR bases functions","authors":"M. Masood, C. Rey, S. Kenney, G. Norris, R. Sherman","doi":"10.1109/RWS.2010.5434219","DOIUrl":"https://doi.org/10.1109/RWS.2010.5434219","url":null,"abstract":"This paper presents a scheme of modeling radio frequency (RF) power amplifier (PAs) for 3-port applications by including modeling of bias port of PA along with its input and output ports. This scheme uses polynomials with infinite impulse response (IIR) bases functions for modeling non-linear behavior of PA as well as its short and long term memory effects. Power amplifiers designed for third generation (WCDMA) wireless system are investigated for the validation of modeling scheme. Excellent results are obtained, where the error between model prediction and measurements is better than 43 dBc for a wide range of bias voltages, with the amplifier being driven with a WCDMA signal at several power levels.","PeriodicalId":334671,"journal":{"name":"2010 IEEE Radio and Wireless Symposium (RWS)","volume":"312 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":"131921865","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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