Best Paper Award at 2009 IEEE International Conference on Communications Technology and Applications (ICCTA2009)
Winner: Anxin Li, Mingshu Wang, Xiangming Li, and Hidetoshi Kayama, NTT DOCOMO Beijing Laboratories
Date: Oct. 16–18, 2009
Organization: IEEE Communications Society
For “Iterative channel estimation in the multiuser pilot-assisted CDMA system”.
A joint channel estimation and interference cancellation receiver is presented for a code division multiple access system. To solve the inaccurate reception problem in the pilot part caused by multiple access interference, a novel iterative structure, a partial combining method, and adaptive piecewise polynomial interpolation are proposed. Large performance gains can be achieved especially in high mobility environments.
Published as: A. Li, M. Wang, X. Li, and H. Kayama, “Iterative Channel Estimation in the Multiuser Pilot-assisted CDMA System,” Proc. IEEE International Conference on Communications Technology and Applications 2009 (ICCTA ’09), Alexandria, Egypt, pp. 535–539, Oct. 2009.
IEEE GLOBECOM 2009 Best Paper Award
Winner: Katsutoshi Kusume†1, Gerhard Bauch†1,2, and Wolfgang Utschick†3
Date: Nov. 30, 2009
For “IDMA vs. CDMA: Detectors, Performance and Complexity”.
This paper presents analytical and numerical comparisons of interleave division multiple access (IDMA) and direct sequence code division multiple access (DS-CDMA) in terms of performance and complexity using an iterative multiuser detection technique. The analysis reveals several advantages of IDMA over DS-CDMA, particularly in highly user loaded scenarios.
Published as: K. Kusume, G. Bauch, and W. Utschick, “IDMA vs. CDMA: Detectors, Performance and Complexity,” Proc. IEEE Global Telecommunications Conference (GLOBECOM 2009), Honolulu, HI, USA, Nov./Dec. 2009.
2010 Internet Architecture Research Award
Winner: Tatsuya Mori, Holly Esquivel, Aditya Akella, Akihiro Shimoda, and Shigeki Goto, NTT Service Integration Laboratories
Date: June 17, 2010
Organization: Technical Committee on Internet Architecture, Institute of Electronics, Information and Communication Engineers (IEICE) of Japan
For “Understanding the Large-scale Spamming Botnet”.
This paper analyzes the activities of the Srizbi botnet, which is the world worst spamming botnet, through long-term measurement data. It details the rise and steady growth of the Srizbi botnet, as well as, the version transition of Srizbi after the shutdown of its control center.
Published as: T. Mori, H. Esquivel, A. Akella, A. Shimoda, and S. Goto, “Understanding the Large-scale Spamming Botnet,” IEICE Tech. Rep., Vol. 109, No. 137, IA2009-31, pp. 53–58, July 2009.
Papers Published in Technical Journals and Conferences Proceedings
Efficient 494 mW sum-frequency Generation of Sodium Resonance Radiation at 589 nm by Using a Periodically Poled Zn:LiNbO3 Ridge Waveguide
T. Nishikawa, A. Ozawa, Y. Nishida, M. Asobe, F.-L. Hong, and T. W. Hänsch
Optics Express, Vol. 17, No. 20, pp. 17792–17800, 2009.
A solid-state-laser-based single-frequency 589 nm light source that can be easily used in the laboratory is needed for sodium spectroscopy studies and cold sodium atom experiments. This paper shows that by using a periodically poled Zn-doped LiNbO3 ridge waveguide for sum-frequency generation, we can obtain a high conversion efficiency to 589 nm light from two sub-watt 1064 and 1319 nm Nd:YAG lasers via a simple single-pass wavelength-conversion process without employing an enhancement cavity. A 494 mW light at 589 nm is generated and achieves overall conversion efficiency from the laser power of 41%. Excellent long-term stability of output power is obtained and its standard deviation is characterized to be 0.09%.
A Re-quantization Noise Reduction Method in MPEG-2 to H.264 Intra Transcoding
T. Yoshitome, K. Kamikura, and N. Kitawaki
Proc. 2009 IEEE Symposium on Industrial Electronics & Applications (ISIEA 2009), Vol. 1, pp. 94–99, Kuala Lumpur, Malaysia, Oct. 2009.
An MPEG-2 to H.264 intra transcoding method is proposed. This method uses the encoding information from an MPEG-2 stream and keeps as many DCT coefficients of the original MPEG-2 bitstream as possible. Experimental results show that the proposed method improves PSNR by about 0.76–1.27 dB compared with a typical conventional method.
Developing of Higher Voltage Direct-current Power-feeding Prototype System
T. Babasaki, T. Tanaka, Y. Nozaki, T. Tanaka, T. Aoki, and F. Kurokawa
Proc. 31st International Telecommunications Energy Conference (INTELEC 2009), pp. 1–5, Incheon, Korea, Oct. 2009.
High efficiency power feeding systems are effective solutions for reducing the power consumption of ICT equipment, such as routers and servers, or high efficiency cooling systems. We developed a higher voltage direct current (HVDC) power feeding system prototype. This system is composed of a rectifier, power distribution cabinet, batteries, and ICT equipment. The configuration is similar to a −48 V DC power supply system. The output of the rectifier is 100 kW, and the output voltage is 401.4 V. We describe the advantage of an HVDC power feeding system and show that its basic characteristics are stable.
Passive Acoustic Sensing of Walking
Proc. 5th International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP 2009) Melbourne, Australia, Dec. 2009.
Acoustic sensing is expected to have a wide variety of practical applications. Sensing of a human walking based on only passive acoustic information was studied experimentally. A simple microphone array consisting of four omnidirectional microphones and a common methodology of signal processing were employed to detect the positions of footsteps. The performance of the system was examined by evaluating the success rate and the spatial error of localization (position estimation) for footsteps in an indoor environment. The results showed that the system was capable of localization and tracking of footsteps within a radius of 3–4 m on the floor. The system can estimate the stride length, speed, and direction of the walking. The performance of real-time localization of footsteps was also evaluated.
Degradation Analysis of InP Buried Heterostructure Layers in Lasers Using Optical-Beam-Induced-Current Technique