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Terahertz Propagation Modeling for Office and Corridor Environments
Hirokazu Sawada;Takeshi Matsumura;Keizo Inagaki;Atsushi Kanno;Katsumi Fujii;Jerdvisanop Chakarothai;Norihiko Sekine;Akifumi Kasamatsu;Hiroyo Ogawa
2023 17th European Conference on Antennas and Propagation (EuCAP)
Year: 2023 | Conference Paper |
Cited by: Papers (2)
For the wireless communication systems in Beyond 5G era, utilization of the frequency range above 100 GHz is considered for high-speed transmission. Therefore, transmission loss models above 100 GHz will be required to design such sub-terahertz and terahertz wireless communication systems. In this paper, transmission loss coefficients in office and corridor environments are studied based on indoor...Show More
90-GHz band propagation characteristics in viaduct environment for railway radiocommunication system between train and trackside
Hirokazu Sawada;Kentaro Ishizu;Fumihide Kojima;Hiroyo Ogawa;Kazuki Nakamura;Nagateru Iwasawa;Kunihiro Kawasaki;Nobuhiko Shibagaki
2017 20th International Symposium on Wireless Personal Multimedia Communications (WPMC)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
For railway radio communication systems between train and trackside, utilization of the 90 GHz band is considered in Japan. To design the system and evaluate the interference to other radio systems, propagation characteristics should be clarified for various usage environments. In this paper, propagation characteristics of path loss and r.m.s. delay spread are described based on measurement result...Show More
High gain antenna characteristics for 300 GHz band fixed wireless communication systems
H. Sawada;A. Kanno;N. Yamamoto;K. Fujii;A. Kasamatsu;K. Ishizu;F. Kojima;H. Ogawa;I. Hosako
2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)
Year: 2017 | Conference Paper |
Cited by: Papers (22)
To realize the terahertz fixed wireless communication links, a high gain antenna is required to compensate the large path loss of high frequency band. In this paper, high gain antennas of horn, cassegrain and off-set parabolic types are developed, and these antenna radiation patterns are measured at 300 GHz. The measured patterns are compared with the mathematical models of lower frequency band, a...Show More
Radio-on-terahertz over fiber system for future mobile fronthauling
Atsushi Kanno;Pham Tien Dat;Iwao Hosako;Tetsuya Kawanishi;Hiroyo Ogawa
The technology of encapsulating a microwave signal into a terahertz carrier and an optical signal is proposed and demonstrated experimentally. Broad bandwidth terahertz radio can encapsulate existing microwave services, including advanced mobile communication signals, by using photonics technology. The concept of radio-on-terahertz-over-fiber helps to realize the future design of mobile fronthaul ...Show More
Recent standardization activities on radio over fiber technologies
2014 IEEE 5th International Conference on Photonics (ICP)
Year: 2014 | Conference Paper |
Cited by: Papers (3)
The Radio over Fiber (RoF) technologies are unique transmission means of radio analog signals through optical fiber cables for radiocommunication services. These technologies are currently discussed at international standard organizations such as ITU-T, IEC APT and IEEE802. This invited paper summarizes recent standardization activities on RoF technologies at those standard organizations.Show More
High-gain radio-over-fiber uplink for mobile fronthaul
Atsushi Kanno;Toshiaki Kuri;Tetsuya Kawanishi;Hiroyo Ogawa;Yoshihiro Imajo
Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on
Year: 2014 | Conference Paper |
Cited by: Papers (4)
A multigigabit relay transceiver system based on analog radio-over-fiber technology is proposed and experimentally evaluated for broadband radio-signal transmission in the millimeter-wave band, particularly at 60 GHz. The combination of a high-speed optical modulator and a photodiode provides signal delivery over an optical fiber. The observed dynamic range and resultant error vector magnitude of ...Show More
Implementation of an OFDM baseband with adaptive modulations to grouped subcarriers for millimeter-wave wireless indoor networks
This paper presents the developed orthogonal frequency division multiplexing (OFDM) baseband processor employing adaptive modulations to grouped subcarriers, and its demonstration in millimeter-wave wireless indoor links. Channel measurements and characterizations are performed in line-of-sight (LOS) office environments where the developed OFDM system is supposed to be used. The OFDM baseband proc...Show More
A Modified SV-Model Suitable for Line-of-Sight Desktop Usage of Millimeter-Wave WPAN Systems
A modified Saleh-Valenzuela (SV) model, which is useful in designing a millimeter-wave WPAN (mmW WPAN) system for line-of-sight (LoS) desktop environments, is proposed. It is demonstrated that a well-known two-path model component is dominantly observed in a typical LoS desktop channel along with the components of the other non-line-of-sight (NLoS) paths. Then, the deterministic two-path model is ...Show More
Millimeter-Wave Fiber-Fed Wireless Access Systems Based on Dense Wavelength-Division-Multiplexing Networks
This paper describes new 60-GHz-band bidirectional fiber-fed wireless access systems, which provide simple antenna base-station architecture and full compatibility with dense wavelength-division multiplexing (DWDM) fiber-optic networks. For downlink millimeter-wave signal generation, the proposed scheme utilizes uplink optical transmitters as downlink optical heterodyne sources, which promises wav...Show More
Feasibility Study and Standardization Activities on Radio on Fiber Devices
2007 International Symposium on Signals, Systems and Electronics
Year: 2007 | Conference Paper |
Cited by: Papers (3)
Millimeter-wave OFDM WPAN system applying adaptive modulation for grouped sub-carriers
2007 IEEE Radio and Wireless Symposium
Year: 2007 | Conference Paper |
Millimeter-wave OFDM wireless personal area network system applying adaptive modulation for grouped sub-carriers was newly developed. It is composed of 100 MHz sampling speed OFDM modems which can employ adaptive modulation for every 8 neighbored subcarriers, and 70-GHz band self-heterodyne transceivers equipped with receiver space diversity. The detailed specifications and the expected maximum th...Show More
Receiver space diversity based on millimeter-wave self-heterodyne transmission technique is demonstrated and its effective gain in two-path channel environments is theoretically and experimentally characterized. Under two-path channel environments, it is shown that the outputs of two receiver diversity modules have different amplitude but almost same phases without employing any millimeter-wave ba...Show More
In this paper we describe overview of the test-bed using gigabit millimeter-wave broadband wireless access systems using 32/18/37 GHz bands. Then, specification and performance of a portable customer-premise equipment employing 4-states combination of adaptive modulation and forward error correction at 32 GHz as a part of the test-bed is introduced. Empirically derived formula of the number of rai...Show More
Performance of 32 GHz Portable Broadband Wireless Access System employing Adaptive Modulation and Forward Error Correction
2006 European Microwave Conference
Year: 2006 | Conference Paper |
In this paper the paper describe overview of test-bed employing millimeter-wave broadband wireless access systems using 32/18/37 GHz bands, which handle up to 1 Gbps data rate. Then, specification and performance of 32 GHz portable customer-premise equipment is introduced, which is employing 4-states combination of adaptive modulation and forward error correction as a part of the test-bedShow More
70-GHz-Band OFDM Transceivers Based on Self-Heterodyne Scheme for Millimeter-Wave Wireless Personal Area Network
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/demodul...Show More
Millimeter-wave wireless personal area network systems
IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2006
Year: 2006 | Conference Paper |
Cited by: Papers (17)
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 e...Show More
24-GHz ultra-wideband short-range impulse radar for vehicular applications
CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006.
Year: 2006 | Conference Paper |
Cited by: Papers (8)
Indoor propagation loss in 70 GHz band
2005 IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications
Year: 2005 | Conference Paper |
Cited by: Papers (1)
In this paper, measurement procedures of propagation loss and examination results between propagation loss and distance in 70 GHz band are reported For the propagation loss, differences of approximate equations in the various environments, such as LoS and NLoS, and relation between an antenna beam width and an attenuation coefficient for distance are discussedShow More
Millimeter wave wireless personal area network (WPAN) and its standardization activity within IEEE802.15
ICMMT 4th International Conference on, Proceedings Microwave and Millimeter Wave Technology, 2004.
Year: 2004 | Conference Paper |
Cited by: Papers (11)
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 ea...Show More
70-GHz-band MMIC transceiver with integrated antenna diversity system: application of receiver-module-arrayed self-heterodyne technique
Our proposed millimeter-wave self-heterodyne transmission technique is a simple and cost-effective solution to frequency stability problems in millimeter-wave access systems. In addition, this technique enables integration of a high-sensitivity receiver with a combining antenna diversity system that is approximately as effective as a maximal-ratio-combining antenna diversity system for all directi...Show More
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