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Spatial Multiplexing Gain for Two Interfering MIMO Broadcast Channels Based on Linear Transceiver
Jaesin Kim,Seok-Hwan Park,Hakjea Sung,Inkyu Lee IEEE 2010 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.9 No.10
<P>In this letter, we provide an expression of spatial multiplexing gain (SMG) for two mutually interfering multiple-input multiple-output (MIMO) broadcast channels, referred to as MIMO-IBC, with linear transceiver. We derive the SMG with respect to user antenna distribution, and compare the systems with and without cooperation among receive antennas in each cell. Additionally, we propose a linear precoding and decoding algorithm for the MIMO-IBC which maximizes the sum rate by extending a solution for single-cell multiple-input single-output broadcast channels. Simulation results confirm the accuracy of our theoretical SMG analysis for the MIMO-IBC.</P>
Secure and Energy-Efficient Transmissions of Fingerprint Images
Sungju Lee,Seungwoo Hong,Hakjea Kim,Yongwha Chung,Sungbum Pan 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
In order to provide remote user authentication services with handheld devices equipped with fingerprint sensors, both energy efficiency and confidentiality/privacy requirements should be satisfied. However, nothing is known about the collective performance of fingerprint verification and secure transmission protocol in remote applications. In this paper, we consider the possible scenarios of an application to securely transmit fingerprint images from a handheld device to a server. It uses both encryption and watermarking and ensures efficiency using compression standards(i.e., WSQ and JPEG2000). Based on the evaluation, the compression scenario using WSQcan reduce the total energy consumption of the no-compression scenario by 33% without significant degradation of the fingerprint recognition rate or watermarking detection rate.