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Professor |
Associate Professor |
Assistant Professor |
- optical communication technology, in particular, modeling, theoretical analysis and simulation of multiple access optical systems;
- architecture design and modeling of computer networks; and
- internetworking technologies for security & reliability sensitive applications
e.g. medical and healthcare networks.
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Current research at the Computer Communications Laboratory (CCL) encompasses
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Refereed Journal Papers
| [pham-01:2007] |
Anh T. Pham and Hiroyuki Yashima. Performance Enhancement of 2-
D WH/TS OCDM Systems using a Heterodyne Detection Receiver and PPM
Signaling. OSA Journal of Optical Networking, 6(6):789-800, 2007. |
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Two-dimensional wavelength hopping/time spreading (2-D WH/TS) synchronous optical
code division multiplexing (OCDM) systems using a heterodyne detection receiver
and pulse-position modulation (PPM) signaling are investigated. Prime sequences are
used as signature code for both wavelength hopping and time spreading. Performance
of the proposed systems is theoretically analyzed taking into account various kinds of
noise and interference, including multiple access interference (MAI), optical beating interference
(OBI), crosstalk and receiver noise. We also compare the performance of the
proposed systems with the conventional ones using on-off keying (OOK) signaling. Numerical
results show the improvement in both number of users and optical power gain
with a proper selection of PPM word length M |
Refereed Proceeding Papers
| [pham-02:2007] |
Anh T. Pham and H. Yashima. Performance Analysis of 2-D OCDM
Systems using Heterodyne Detection Receiver and OPPM Signaling. In IEEE
20th Annual Lasers and Electro Optics Society Meeting (LEOS'07), pages CD-ROM,
Orlando, FL, USA, Oct. 2007. IEEE, LEOS. |
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The paper proposes and theoretically analyses the performance of 2-D WT/TS OCDM
systems using heterodyne detection receiver and overlapping pulse-position modulation
(OPPM) signaling. Major noises, such as receiver's noise and optical beating interference
(OBI) are considered in the analysis. The system performance is compared to the case
when pulse-position modulation (PPM) scheme is employed. It is seen that the proposed
system offers significant improvement when the same code set is used |
Unrefereed Papers
| [pham-03:2007] |
Anh T. Pham and Hiroyuki Yashima. Performance Improvement of
the Heterodyne-Detection 2-D OCDM Systems using Overlapping Pulse-Position
Modulation. In IEICE Technical Report, pages 87-91, Kyushu Institute of Technology,
Kyushu, Japan, Nov. 2007. IEICE CS. |
Grants
| [pham-04:2007] |
Anh T. Pham. Grants-in-Aid (Grant No. 18760278) for Encouragement of Young Scientists, awarded by the Japan Society for Promotion of Science,
2006-2008. |
Academic Activities
| [pham-05:2007] |
Anh T. Pham, 2005. Technical reviewer for various IEEE, IPSJ, Elsevier, IASTED journals, transactions and international conferences. |
| [pham-06:2007] |
Anh T. Pham, 2005-2008. Member of the Technical Committee on Telecommunications. |
Ph.D and Others Theses
| [pham-07:2007] |
Kunio Maegawa. Graduation Thesis: Performance Analysis of Spectral-
Amplitude-Coding Optical CDMA Using Overlapping-Pulse-Position Modulation,
University of Aizu, 2007. Thesis Advisor: Anh T. Pham |
| [pham-08:2007] |
Daijiyu Yamauchi. Graduation Thesis: Performance Analysis of
OCDMA Networks using ALOHA Media Access Control with Optical Hard-
Limiters, University of Aizu, 2007. Thesis Advisor: Anh T. Pham |
| [pham-09:2007] |
Yukio Akutsu. Master Thesis: Virtual Port Translation with Proxy
Hosts for Inbound NAT Traversal, University of Aizu, 2007. Thesis Advisor: Anh T. Pham and A. Kara, |
| [pham-10:2007] |
Takeshi Endou. Graduation Thesis: The Analysis of Optical CDMA
Networks Throughput Using Aloha Media Access Control with APD and Thermal
Noises, University of Aizu, 2007. Thesis Advisor: Anh T. Pham |
