The Experts below are selected from a list of 15939 Experts worldwide ranked by ideXlab platform
H Ogawa - One of the best experts on this subject based on the ideXlab platform.
-
70 ghz band ofdm transceivers based on self heterodyne scheme for millimeter wave wireless Personal Area Network
IEEE Transactions on Microwave Theory and Techniques, 2006Co-Authors: Yozo Shoji, Changsoon Choi, H OgawaAbstract:70-GHz-band orthogonal frequency-division multiplexing (OFDM) transceivers were developed by combining self-heterodyne transmission with two-element diversity reception. The transceivers were used to study and demonstrate a millimeter-wave wireless Personal Network that enables cost-effective broadband data transmissions in a multipath channel environment. A 100-MHz sampling OFDM modulator/demodulator was developed for the baseband part. It has a payload data rate of 100 Mb/s using quadrature phase-shift keying (QPSK) modulation and a coding rate of 3/4 (many other modulations and coding rate are available). The bit error rate was experimentally evaluated when a pair of devices was placed on a wooden table under line-of-sight path conditions. The results showed that the combined use of the self-heterodyne technique and two-element diversity receiver successfully avoids serious signal fading at unpredictable transmission distances. The transceiver with QPSK modulation and coding rate of 1/2 for forward error correction achieves error-free data transmission over a distance of up to 3.4 m. In addition, a successful transmission in 64 quadrature amplitude modulation mode was demonstrated, although the communication range was quite short
-
millimeter wave wireless Personal Area Network systems
Radio Frequency Integrated Circuits Symposium, 2006Co-Authors: H OgawaAbstract:A millimeter-wave wireless Personal Network (WPAN) system is designed to provide short-range, high-speed multi-media data services to terminals in rooms or office space. Millimeter-wave ad-hoc wireless access system has been developed by the Yokosuka Research Park (YRP) collaborated group which was organized by NICT Yokosuka Radio Communication Research Center. This system is designed to provide easy connectivity, Network flexibility and high transmission data rate suitable for WAPN service. The millimeter-wave ad-hoc system and its technologies, and the other 60-GHz applications are first presented, the millimeter-wave interest (mmWIG), study (SG3c) and task (TG3c) groups which were recently organized and approved within IEEE802.15 are introduced and its activity are presented.
-
millimeter wave wireless Personal Area Network wpan and its standardization activity within ieee802 15
International Conference on Microwave and Millimeter Wave Technology, 2004Co-Authors: H OgawaAbstract:A millimeter wave wireless Personal Network (WPAN) system is designed to provide short-range, high-speed multimedia data services to terminals in rooms or office space. Millimeter wave ad hoc wireless access system has been developed by the Yokosuka Research Park (YRP) collaborated group which was organized by NICT Yokosuka Radio Communication Research Center. This system is designed to provide easy connectivity, Network flexibility and high transmission data rate suitable for WAPN service. The millimeter wave ad hoc system and its technologies were presented, and the millimeter wave interest and study groups which were recently organized and approved within IEEE802.15 were introduced and its activity presented.
Jose A. Gutierrez - One of the best experts on this subject based on the ideXlab platform.
-
IEEE 802.15.4 low rate - wireless Personal Area Network coexistence issues
2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003., 2003Co-Authors: Ivan Howitt, Jose A. GutierrezAbstract:IEEE 802.15.4 is a proposed standard addressing the needs of low-rate wireless Personal Area Networks or LR-WPAN with a focus on enabling wireless sensor Networks. The standard is characterized by maintaining a high level of simplicity, allowing for low cost and low power implementations. Its operational frequency band includes the 2.4GHz industrial, scientific and medical band providing nearly worldwide availability; additionally, this band is also used by other IEEE 802 wireless standards. Coexistence among diverse collocated devices in the 2.4 GHz band is an important issue in order to ensure that each wireless service maintains its desired performance requirements. This paper presents a brief technical introduction of the IEEE 802.15.4 standard and analyzes the coexistence impact of an IEEE 802.15.4 Network on the IEEE 802.11b devices.
-
ieee 802 15 4 a developing standard for low power low cost wireless Personal Area Networks
IEEE Network, 2001Co-Authors: Jose A. Gutierrez, M Naeve, Edgar H Callaway, M Bourgeois, V Mitter, B HeileAbstract:A low-rate wireless Personal Area Network, or LR-WPAN, is a Network designed for low-cost very-low-power short-range wireless communications. Until now, the main focus in the wireless industry has been on communications. Until now, the main focus in the wireless industry has been on communication with higher data throughput, leaving out a set of applications requiring simple wireless connectivity with relaxed throughput and latency requirements. LR-WPANs will connect devices that previously have not been Networked and allow applications that cannot use current wireless specifications, including applications in fields such as industrial, agricultural, vehicular, residential, medical sensors and actuators. TaskGroup 4 of the IEEE 802.14 Wireless Personal Area Network working group is currently working to define a wireless communication standard for LR-WPANs. This article discusses the technical considerations and system requirements necessary when implementing a low-cost low-power wireless Personal Area Network and provides an overview of the unique applications such a technology will enable.
Aruna Seneviratne - One of the best experts on this subject based on the ideXlab platform.
-
seamless resource sharing in wearable Networks by application function virtualization
IEEE Transactions on Mobile Computing, 2019Co-Authors: Harini Kolamunna, Dwight Makaroff, Diego Perino, Kanchana Thilakarathna, Aruna SeneviratneAbstract:The prevalence of smart wearable devices is increasing exponentially and we are witnessing a wide variety of fascinating new services that leverage the capabilities of these wearables. Wearables are truly changing the way mobile computing is deployed and mobile apps are being developed. It is possible to leverage the capabilities such as connectivity, processing, and sensing of wearable devices in an adaptive manner for efficient resource usage and information accuracy within the Personal Area Network. We show that app developers are not yet taking advantage of these cross-device capabilities, however, instead using wearables as passive sensors or simple end displays to provide notifications to the user. We thus design Application Function Virtualization (AFV), an architecture enabling automated dynamic function virtualization and scheduling across devices in a Personal Area Network, simplifying the development of the apps that are adaptive to context changes. AFV provides a simple set of APIs hiding complex architectural tasks from app developers whilst continuously monitoring the user, device, and Network context, to enable the adaptive invocation of functions across devices. We show the feasibility of our design by implementing AFV on Android, and the benefits for the user in terms of resource efficiency, especially in saving energy consumption, and quality of experience with multiple use cases.
Harini Kolamunna - One of the best experts on this subject based on the ideXlab platform.
-
seamless resource sharing in wearable Networks by application function virtualization
IEEE Transactions on Mobile Computing, 2019Co-Authors: Harini Kolamunna, Dwight Makaroff, Diego Perino, Kanchana Thilakarathna, Aruna SeneviratneAbstract:The prevalence of smart wearable devices is increasing exponentially and we are witnessing a wide variety of fascinating new services that leverage the capabilities of these wearables. Wearables are truly changing the way mobile computing is deployed and mobile apps are being developed. It is possible to leverage the capabilities such as connectivity, processing, and sensing of wearable devices in an adaptive manner for efficient resource usage and information accuracy within the Personal Area Network. We show that app developers are not yet taking advantage of these cross-device capabilities, however, instead using wearables as passive sensors or simple end displays to provide notifications to the user. We thus design Application Function Virtualization (AFV), an architecture enabling automated dynamic function virtualization and scheduling across devices in a Personal Area Network, simplifying the development of the apps that are adaptive to context changes. AFV provides a simple set of APIs hiding complex architectural tasks from app developers whilst continuously monitoring the user, device, and Network context, to enable the adaptive invocation of functions across devices. We show the feasibility of our design by implementing AFV on Android, and the benefits for the user in terms of resource efficiency, especially in saving energy consumption, and quality of experience with multiple use cases.
Yozo Shoji - One of the best experts on this subject based on the ideXlab platform.
-
70 ghz band ofdm transceivers based on self heterodyne scheme for millimeter wave wireless Personal Area Network
IEEE Transactions on Microwave Theory and Techniques, 2006Co-Authors: Yozo Shoji, Changsoon Choi, H OgawaAbstract:70-GHz-band orthogonal frequency-division multiplexing (OFDM) transceivers were developed by combining self-heterodyne transmission with two-element diversity reception. The transceivers were used to study and demonstrate a millimeter-wave wireless Personal Network that enables cost-effective broadband data transmissions in a multipath channel environment. A 100-MHz sampling OFDM modulator/demodulator was developed for the baseband part. It has a payload data rate of 100 Mb/s using quadrature phase-shift keying (QPSK) modulation and a coding rate of 3/4 (many other modulations and coding rate are available). The bit error rate was experimentally evaluated when a pair of devices was placed on a wooden table under line-of-sight path conditions. The results showed that the combined use of the self-heterodyne technique and two-element diversity receiver successfully avoids serious signal fading at unpredictable transmission distances. The transceiver with QPSK modulation and coding rate of 1/2 for forward error correction achieves error-free data transmission over a distance of up to 3.4 m. In addition, a successful transmission in 64 quadrature amplitude modulation mode was demonstrated, although the communication range was quite short
