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Institution

NTT DoCoMo

About: NTT DoCoMo is a based out in . It is known for research contribution in the topics: Base station & Mobile station. The organization has 4032 authors who have published 8655 publications receiving 160533 citations.


Papers
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Patent
14 Sep 2012
TL;DR: In this article, two alternative embodiments are disclosed to enable a user equipment to efficiently discover small cells using a secondary carrier, where the user equipment has a primary carrier link to a base station and the secondary carrier links to a network node in a small cell within a macro cell supported by the base station.
Abstract: Two alternative embodiments are disclosed to enable a user equipment to efficiently discover small cells using a secondary carrier. The user equipment has a primary carrier link to a base station. In addition, the user equipment has a secondary carrier link to a network node in a small cell within a macro cell supported by the base station. The small cells are discovered through novel beacon signals or through modified PSS/SSS transmissions.

44 citations

Journal ArticleDOI
TL;DR: In this paper, the authors consider how FSOLs act as useful transport media, focusing on practical experience in mobile backhaul networks and refer to studies on FSOL conducted by the International Telecommunications Union (ITU) from the viewpoint of the possible exploitation of the frequency bands above 3,000 GHz, which are outside the scope of the current Radio Regulations.
Abstract: This article discusses the prospect of free- space optical links (FSOLs) in relation to backhaul applications as well as its technology trend, including the recent development of radio on free-space optical links (RoFSOLs). Here, we consider how FSOLs act as useful transport media, focusing on practical experience in mobile backhaul networks. We refer to studies on FSOL conducted by the International Telecommunications Union (ITU) from the viewpoint of the possible exploitation of the frequency bands above 3,000 GHz, which are outside the scope of the current Radio Regulations.

44 citations

Proceedings ArticleDOI
Tetsushi Abe1, T. Matsumoto
07 Oct 2001
TL;DR: Simulation results show the proposed equalizer can properly separate multiple user signals in frequency selective MIMO channels, and achieves a drastic reduction in computational complexity compared with conventional trellis-based turbo equalizers.
Abstract: A computationally efficient space-time turbo equalization algorithm is derived for frequency selective multiple-input multiple-output (MIMO) channels. The algorithm is an extension of the iterative equalization algorithm by Reynolds and Wang (2001) for frequency selective fading channels. This paper's proposed equalizer performs MIMO channel estimation, multiple user signal detection, and decoding, jointly all in an iterative manner. The iterative channel estimator achieves high accuracy in estimating channel parameters even if only a relatively small number of unique word symbols are available. The multiple user signal detector (MUSD) consists of soft interference cancellers for the multiple users, each followed by a minimum mean square error (MMSE) filter. With this simple structure, the proposed detector achieves a drastic reduction in computational complexity compared with conventional trellis-based turbo equalizers. Simulation results show the proposed equalizer can properly separate multiple user signals in frequency selective MIMO channels.

44 citations

Patent
17 Jul 2001
TL;DR: In this paper, a program providing system consisting of a settop box (STB) and a receiver (TV) is proposed to realize program provision matching users, where the portable telephone (MS) transmits control signals including IDs to the STB.
Abstract: A program providing system which can realize program provision matching users. This system comprises a settop box (STB) and a receiver (TV) which receive program data broadcasted from a broadcasting station (BC) and provide programs expressed by the program data to the users and a portable telephone (MS) which is housed in a mobile communication network (MN) and holds IDs (identifying information) capable of specifying users. The portable telephone (MS) transmits control signals including IDs to the settop box (STB), which holds the IDs and attributive information corresponding to the IDs. When receiving a control signal from the portable telephone MS, the settop box (STB) executes a processing matching the attributive information corresponding to the IDs included in this control signal.

44 citations

Proceedings ArticleDOI
Atsushi Fukuda1, Hiroshi Okazaki1, Shoichi Narahashi1, T. Hirota, Yasushi Yamao 
12 Jun 2005
TL;DR: In this paper, a triple-band reconfigurable power amplifier (PA), which comprises the band-switchable matching networks with RF-MEMS switches, is presented and switch requirements for multi-band operation are discussed.
Abstract: A triple-band reconfigurable power amplifier (PA), which comprises the band-switchable matching networks with RF-MEMS switches, is presented. The design method of the triple-band PA is described and switch requirements for multi-band operation are discussed. The switch satisfies the estimated requirements. The fabricated triple-band PA achieves high output power and high power added efficiency in three different frequency bands, 900 MHz, 1500 MHz, and 2000 MHz, respectively. We conclude that the proposed reconfigurable PA is easily expanded to multi-band operation and is quite promising for future mobile terminals.

44 citations


Authors

Showing all 4032 results

NameH-indexPapersCitations
Amit P. Sheth10175342655
Harald Haas8575034927
Giuseppe Caire8282540344
Craig Gentry7522239327
Raj Jain6442430018
Karl Aberer6355417392
Fumiyuki Adachi54101015344
Ismail Guvenc5245113893
Frank Piessens5239110381
Wolfgang Kellerer495029383
Yoshihisa Kishiyama4837911831
Ravi Jain481607467
Josef A. Nossek4862310377
Tadao Nagatsuma4743011117
Christian Bettstetter4620411051
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202164
2020143
2019240
2018269
2017193
2016173