Performance measurements of four wireless systems (GSM900, GSM1800, UMTS and WLAN) simultaneously... more Performance measurements of four wireless systems (GSM900, GSM1800, UMTS and WLAN) simultaneously transported over an indoor wireless network fed by a low-cost 850-nm vertical-cavity surfaceemitting laser (VCSEL) – 300m length of multimode fibre is presented. The measurement focuses on the error vector magnitude (EVM) performance of the GSM900, GSM1800, and UMTS in co-existence with each other and with WLAN. Throughput performance of WLAN in co-existence with the other three wireless systems is also presented in this paper.
IEEE Transactions on Microwave Theory and Techniques, 2000
Page 1. 2596 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 48, NO. 12, DECEMBER 2000... more Page 1. 2596 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 48, NO. 12, DECEMBER 2000 Indirect Optically Injection-Locked Oscillator for Millimeter-Wave Communication System Xu Wang, Student ...
Two solutions for UHF RFID tags for soil moisture sensing were designed and are described in this... more Two solutions for UHF RFID tags for soil moisture sensing were designed and are described in this paper. In the first, two conventional tags (standard transponders) are employed: one, placed close to the soil surface, is the sensor tag, while the other, separated from the soil, is the reference for system calibration. By transmission power ramps, the tag's turn-on power levels are measured and correlated with soil condition (dry or wet). In the second solution, the SL900A chip, which supports up to two external sensors and an internal temperature sensor, is used. An interdigital capacitive sensor was connected to the transponder chip and used for soil moisture measurement. In a novel design for an UHF RFID tag the sensor is placed below the soil surface, while the transponder and antenna are above the soil to improve communication. Both solutions are evaluated practically and results show the presence of water in soil can be remotely detected allowing for their application in la...
Fiber optic components offer a competitive implementation for applications exploiting the millime... more Fiber optic components offer a competitive implementation for applications exploiting the millimeter-wave and THz regimes due to their capability for implementing broadband, compact, and cost-effective systems. In this paper, an outline of the latest technology developments and applications of fiber-optic-based technologies for the generation, transmission, and processing of high-frequency radio signals is provided.
Performance measurements of four wireless systems (GSM900, GSM1800, UMTS and WLAN) simultaneously... more Performance measurements of four wireless systems (GSM900, GSM1800, UMTS and WLAN) simultaneously transported over an indoor wireless network fed by a low-cost 850-nm vertical-cavity surfaceemitting laser (VCSEL) – 300m length of multimode fibre is presented. The measurement focuses on the error vector magnitude (EVM) performance of the GSM900, GSM1800, and UMTS in co-existence with each other and with WLAN. Throughput performance of WLAN in co-existence with the other three wireless systems is also presented in this paper.
IEEE Transactions on Microwave Theory and Techniques, 2000
Page 1. 2596 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 48, NO. 12, DECEMBER 2000... more Page 1. 2596 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 48, NO. 12, DECEMBER 2000 Indirect Optically Injection-Locked Oscillator for Millimeter-Wave Communication System Xu Wang, Student ...
Two solutions for UHF RFID tags for soil moisture sensing were designed and are described in this... more Two solutions for UHF RFID tags for soil moisture sensing were designed and are described in this paper. In the first, two conventional tags (standard transponders) are employed: one, placed close to the soil surface, is the sensor tag, while the other, separated from the soil, is the reference for system calibration. By transmission power ramps, the tag's turn-on power levels are measured and correlated with soil condition (dry or wet). In the second solution, the SL900A chip, which supports up to two external sensors and an internal temperature sensor, is used. An interdigital capacitive sensor was connected to the transponder chip and used for soil moisture measurement. In a novel design for an UHF RFID tag the sensor is placed below the soil surface, while the transponder and antenna are above the soil to improve communication. Both solutions are evaluated practically and results show the presence of water in soil can be remotely detected allowing for their application in la...
Fiber optic components offer a competitive implementation for applications exploiting the millime... more Fiber optic components offer a competitive implementation for applications exploiting the millimeter-wave and THz regimes due to their capability for implementing broadband, compact, and cost-effective systems. In this paper, an outline of the latest technology developments and applications of fiber-optic-based technologies for the generation, transmission, and processing of high-frequency radio signals is provided.
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Papers by Nathan Gomes