Multicarrier/Multirate MODEM Operated by Time-Division Multiple Process

Tanabe, Kazuhiro; Kobayashi, Kiyoshi; Ohata, Kohei; Ueba, Masazumi

doi:10.2514/6.2002-2069

Cited by 15 publications

(3 citation statements)

References 2 publications

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“…3. GMM adopts a multi-rate filter bank (MFB) that consists of cascaded two-channel filter banks in a tree-like configuration for multi-carrier signal decomposition/composition [2]. Each two-channel filter bank has a high-pass filter and a low-pass filter followed by a downsampler, and it hierarchically divides the input bandwidth.…”

Section: Technical Issues With Gmm and Tcmmentioning

confidence: 99%

Development of Highly Efficient Group Modem Module and Turbo Codec Module for Next Generation Satellite Communication Systems

Yamashita,

Yamanaka,

Kobayashi

2016

NTT Technical Review

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Section: Technical Issues With Gmm and Tcmmentioning

confidence: 99%

Development of Highly Efficient Group Modem Module and Turbo Codec Module for Next Generation Satellite Communication Systems

Yamashita,

Yamanaka,

Kobayashi

2016

NTT Technical Review

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“…10. These features are achieved by combining a seamless multi-rate filter bank with the timeshared processing modem [18]. The outlook of the developed group modem is shown in Fig.…”

Section: Challenges Toward Broadband Multimedia and Interactive Servmentioning

confidence: 99%

Recent Japanese R&D in Satellite Communications

Umehira

Kobayashi

Yasui

et al. 2009

IEICE Trans. Commun.

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SUMMARYCurrent trend in telecommunications is "broadband" and "ubiquitous." To achieve this goal, satellite communications systems are expected to play an important role in cooperation with terrestrial communications systems. Along with the advancement of optical fiber transmission systems, the role of satellite communications was dramatically changed from long distance transmission to various applications utilizing unique features of satellite communications. This paper overviews recent Japanese R&D in satellite communications.

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“…The operation of the demodulator is detailed below. Compact VPFDM modems can be realized by time-sharing one circuit among all carriers [4], which drastically reduces terminal size. Due to the multi-carrier arrangement, see Fig.3 (b), even small frequency band gaps like V2 and H3 in Fig.3(c) can be assigned to any user, which improves frequency utilization.…”

Section: A Proposed Vpfdm Systemmentioning

confidence: 99%

Variable Polarization/Frequency Division Multiplexing (VPFDM) for Satellite Communications

Yamashita

Kobayashi

Ueba

et al. 2006

IEEE Vehicular Technology Conference

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To realize advanced broadband mobile satellite communications, this paper proposes a new wireless access approach named Variable Polarization Frequency Division Multiplexing(VPFDM); it assigns the resources created by dual polarization states as well as frequency bandwidth to customers. The most significant problem in using dual polarization is cross-polarization interference. For satellite communications, when existing terminals and/or satellites employs asynchronous frequency conversion of V/H polarizations, received signals undergo a mixture of frequency offsets. Aiming to overcome this satellite-specific problem, we propose a novel VPFDM modem that can handle multi-carrier multi-rate dual polarization signals. The results of simulations and experiments show that the proposed modem is applicable to satellite communications.

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Multicarrier/Multirate MODEM Operated by Time-Division Multiple Process

Cited by 15 publications

References 2 publications

Development of Highly Efficient Group Modem Module and Turbo Codec Module for Next Generation Satellite Communication Systems

Development of Highly Efficient Group Modem Module and Turbo Codec Module for Next Generation Satellite Communication Systems

Recent Japanese R&D in Satellite Communications

Variable Polarization/Frequency Division Multiplexing (VPFDM) for Satellite Communications

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