Masazumi UEBA


Progress in and Prospects of On-Board Communication Equipment Technologies for Communications Satellites in Japan
Masazumi UEBA Akihiro MIYASAKA Yoshinori SUZUKI Fumihiro YAMASHITA 
Publication:   
Publication Date: 2017/09/01
Vol. E100-B  No. 9  pp. 1633-1643
Type of Manuscript:  INVITED SURVEY PAPER
Category: Satellite Communications
Keyword: 
on-board communication equipmentcommunications satellitesmulti-beam satellite communication systemtransponderantenna reflectoron board processorbeam forming
 Summary | Full Text:PDF(2.7MB)

Switchable Multi-Frequency MMIC Oscillator for the 60 GHz Millimeter Wave Band
Eddy TAILLEFER Shoichi KITAZAWA Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 497-504
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
proof-of-conceptoscillatorMMICswitched-capacitormillimeter wave bandGaAs p-HEMT
 Summary | Full Text:PDF(556.9KB)

60-GHz-Band Switched-Beam Eight-Sector Antenna with SP8T Switch for 180 Azimuth Scan
Amane MIURA Masataka OHIRA Shoichi KITAZAWA Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/03/01
Vol. E93-B  No. 3  pp. 551-559
Type of Manuscript:  PAPER
Category: Devices/Circuits for Communications
Keyword: 
millimeter wavewireless LANswitched-beam antennamulti-sector antennasingle-pole eight-throw switch
 Summary | Full Text:PDF(2.5MB)

A Prototype Modem for Hyper-Multipoint Data Gathering SATCOM Systems --- A Group Modem Applicable to Arbitrarily and Dynamically Assigned FDMA Signals ---
Kiyoshi KOBAYASHI Fumihiro YAMASHITA Jun-ichi ABE Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/11/01
Vol. E92-B  No. 11  pp. 3318-3325
Type of Manuscript:  Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2008)
Category: 
Keyword: 
FFT filter bankgroup modemhyper-multipoint data gatheringarbitrary and dynamic frequency assignmentsatellite communication
 Summary | Full Text:PDF(1.7MB)

Performance of Pre-FFT Type MMSE Adaptive Array Antenna with Iterative Weight Update in Presence of Sporadic Intra-System Interference
Kazuto YANO Makoto TAROMARU Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/05/01
Vol. E92-B  No. 5  pp. 1852-1859
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
pre-FFT type adaptive array antennasporadic interference suppressionOFDMindoor LOS propagationpacket transmissionIEEE 802.11a
 Summary | Full Text:PDF(864KB)

Deformed Antenna Pattern Compensation Technique for Multi-Beam Antennas in Broadband and Scalable Mobile Communications Satellites
Yoshinori SUZUKI Satoshi HARADA Kiyoshi KOBAYASHI Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2280-2287
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Antennas
Keyword: 
communication satelliteonboard antennamulti-beamphased array
 Summary | Full Text:PDF(1.4MB)

Communication Capacity and Quality Enhancement Using a Two-Layered Adaptive Resource Allocation Scheme for Multi-Beam Mobile Satellite Communication Systems
Katsuya NAKAHIRA Kiyoshi KOBAYASHI Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/07/01
Vol. E89-A  No. 7  pp. 1930-1939
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
mobile satellite communicationmulti beamresource allocationcapacity enhancementQoSoptimization
 Summary | Full Text:PDF(1MB)

Layer 3 Diversity Reception Technology for Ku-Band Mobile Satellite Communication Systems
Fumiaki NAGASE Jin MITSUGI Masayoshi NAKAYAMA Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/06/01
Vol. E89-B  No. 6  pp. 1856-1861
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
mobile satellite communicationsshadowingdiversity receptionlayer 3
 Summary | Full Text:PDF(1.8MB)

Seamless Symbol Rate Switching Scheme for Multi-Rate FDMA Modem
Fumihiro YAMASHITA Kiyoshi KOBAYASHI Kohei OHATA Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/02/01
Vol. E89-B  No. 2  pp. 545-555
Type of Manuscript:  PAPER
Category: Satellite Communication
Keyword: 
symbol ratesatellite communicationsseamless switchingmodem
 Summary | Full Text:PDF(2MB)

Enhanced Multi-Correlator AFC for Fast and Wide Range Frequency Acquisition
Fumihiro YAMASHITA Kiyoshi KOBAYASHI Yoshinori NAKASUGA Jin MITSUGI Masazumi UEBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/08/01
Vol. E87-B  No. 8  pp. 2072-2081
Type of Manuscript:  Special Section PAPER (Special Section on Recent Fundamental Technologies for Broadband Satellite Communications)
Category: 
Keyword: 
AFCcorrelatorssatellite communicationslarge acquisition range
 Summary | Full Text:PDF(2.5MB)