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- Ill-Keun Rhee, Jaehan Lee, Jang-Sub Kim, Erchin Serpedin, Yik-Chung Wu
- Sensors
- 2009

The development of tiny, low-cost, low-power and multifunctional sensor nodes equipped with sensing, data processing, and communicating components, have been made possible by the recent advances in micro-electro-mechanical systems (MEMS) technology. Wireless sensor networks (WSNs) assume a collection of such tiny sensing devices connected wirelessly and… (More)

- Jang-Sub Kim, Erchin Serpedin, Dong Ryeol Shin
- IEEE Signal Processing Letters
- 2008

This letter proposes a new method to estimate the number of competing stations in IEEE 802.11 networks. Due to the nonlinear/non-Gaussian nature of measurement model, a nonlinear filtering algorithm, called the Gaussian mixture sigma point particle filter (GMSPPF), is proposed herein to estimate the number of competing stations. Since GMSPPF represents a… (More)

- Qasim M. Chaudhari, Erchin Serpedin, Jang-Sub Kim
- IEEE Transactions on Information Theory
- 2010

For a meaningful processing of the information sensed by a wireless sensor network (WSN), the clocks of the individual nodes need to be matched through some well-defined procedures. Extending the idea of having silent nodes in a WSN overhear the two-way timing message communication between two active (master and slave) nodes, this paper derives the… (More)

- Jang-Sub Kim, Jaehan Lee, Erchin Serpedin, Khalid A. Qaraqe
- IEEE Transactions on Signal Processing
- 2011

Assuming that the network delays are normally distributed and the network nodes are subject to clock phase offset errors, the maximum likelihood estimator (MLE) and the Kalman filter (KF) have been recently proposed with the goal of maximizing the clock synchronization accuracy in wireless sensor networks (WSNs). However, because the network delays may… (More)

- Jang-Sub Kim, Erchin Serpedin, Dong Ryeol Shin, Khalid A. Qaraqe
- EURASIP J. Wireless Comm. and Networking
- 2008

This paper proposes a novel vertical handoff algorithm between WLAN and CDMA networks to enable the integration of these networks. The proposed vertical handoff algorithm assumes a handoff decision process (handoff triggering and network selection). The handoff trigger is decided based on the received signal strength (RSS). To reduce the likelihood of… (More)

- Jang-Sub Kim, Jaehan Lee, Erchin Serpedin, Khalid A. Qaraqe
- Signal Processing
- 2009

To cope with the Gaussian or non-Gaussian nature of the random network delays, a novel method, referred to as the Gaussian mixture Kalman particle filter (GMKPF), is proposed herein to estimate the clock offset in wireless sensor networks. GMKPF represents a better and more flexible alternative to the symmetric Gaussian maximum likelihood (SGML), and… (More)

- Kyung-Soo Jang, Jang-Sub Kim, Ho-Jin Shin, Dong Ryeol Shin
- Fourth Annual ACIS International Conference on…
- 2005

The integration of WLANs and CDMA networks has recently evolved into hot issue. We propose a vertical handoff algorithm between WLAN and CDMA network. In this algorithm, a vertical handoff is classified into handoff decision making and MIP (mobile IP) registration process. Then, a handoff initiation is decided by the received signal strength (RSS). To… (More)

- Jaehan Lee, Jang-Sub Kim, Erchin Serpedin
- WASA
- 2008

- Jang-Sub Kim, Ho-Jin Shin, Dong Ryeol Shin, Woo-Gon Chung
- International Conference on Wireless Networks
- 2004

- Jang-Sub Kim, Jaehan Lee, Erchin Serpedin, Khalid A. Qaraqe
- EURASIP J. Adv. Sig. Proc.
- 2010

The maximum likelihood estimators (MLEs) for the clock phase offset assuming a two-way message exchange mechanism between the nodes of a wireless sensor network were recently derived assuming Gaussian and exponential network delays. However, the MLE performs poorly in the presence of non-Gaussian or nonexponential network delay distributions. Currently,… (More)