Papers by Han Chi Thien M0623018
2000 IEEE International Symposium on Information Theory (Cat. No.00CH37060)
In this paper the design of interleavers for Turbo Codes is considered. The proposed algorithm is... more In this paper the design of interleavers for Turbo Codes is considered. The proposed algorithm is based on a Hamming weight cost matrix. It optimizes both the minimal distance of Turbo Codes and the passing of extrinsic information. Simulation results show that for short lengths these interleavers improve the error performances at high SNR.
Lecture Notes in Computer Science, 1999
A recursive convolutional encoder can be regarded as an innite impulse response system over the G... more A recursive convolutional encoder can be regarded as an innite impulse response system over the Galois Field of order 2. First, in this paper, we i n troduce nite response input sequences for recursive convolutional codes that give nite weight output sequences. In practice, we often need to describe the nite response sequence with a certain Hamming weight. Then, di erent properties of nite response input sequences are presented. It is shown that all nite response input sequences with a certain Hamming weight can be obtained in closed-form expressions from the so-called basic sequences. These basic sequences are presented for important recursive convolutional encoders and some possible applications are given .
Proceedings. 2001 IEEE International Symposium on Information Theory (IEEE Cat. No.01CH37252), 2001
EURASIP Journal on Advances in Signal Processing, 2004
We propose a new timing error detector for timing tracking loops inside the Rake receiver in spre... more We propose a new timing error detector for timing tracking loops inside the Rake receiver in spread spectrum systems. Based on a particle filter, this timing error detector jointly tracks the delays of each path of the frequency-selective channels. Instead of using a conventional channel estimator, we have introduced a joint time delay and channel estimator with almost no additional computational complexity. The proposed scheme avoids the drawback of the classical early-late gate detector which is not able to separate closely spaced paths. Simulation results show that the proposed detectors outperform the conventional early-late gate detector in indoor scenarios.
-Dans le cadre d'un contrat avec un opérateur satellite, nous avons développé un système d'analys... more -Dans le cadre d'un contrat avec un opérateur satellite, nous avons développé un système d'analyse et de traitement en temps réel du train transport MPEG-2. Intégré sur une plate-forme de type PC sous « Windows NT », les différents éléments matériels et logiciels permettent de tester les aspects de transmission (diagramme de l'oeil, constellation, taux d'erreurs), de conformité et de surveillance de la composition du train transport. Le système peut aussi acquérir, enregistrer sur disque et restituer le train transport.
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Papers by Han Chi Thien M0623018