ChangWoo Lee


2 Implementation of IEEE 802.15.4 Packet Analyzer

Authors: Sang Woo Kim, ChangWoo Lee, Sung Jun Ban, Hyeonwoo Cho


A packet analyzer is a tool for debugging sensor network systems and is convenient for developers. In this paper, we introduce a new packet analyzer based on an embedded system. The proposed packet analyzer is compatible with IEEE 802.15.4, which is suitable for the wireless communication standard for sensor networks, and is available for remote control by adopting a server-client scheme based on the Ethernet interface. To confirm the operations of the packet analyzer, we have developed two types of sensor nodes based on PIC4620 and ATmega128L microprocessors and tested the functions of the proposed packet analyzer by obtaining the packets from the sensor nodes.

Keywords: Embedded system, Sensor Network, packet analyzer

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1 Affine Projection Algorithm with Variable Data-Reuse Factor

Authors: Sang Woo Kim, ChangWoo Lee, Young Kow Lee, Sung Jun Ban, SungHoo Choi


This paper suggests a new Affine Projection (AP) algorithm with variable data-reuse factor using the condition number as a decision factor. To reduce computational burden, we adopt a recently reported technique which estimates the condition number of an input data matrix. Several simulations show that the new algorithm has better performance than that of the conventional AP algorithm.

Keywords: condition number, misalignment, convergence rate, affine projection algorithm, variable data-reuse factor

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