Dong-Beom Shin

ISO/IEC 18000-7 based on RFID multi-hop relay system

In this paper, we analyze the ISO/IEC 18000-7 active RFID system. In order to improve the coverage in sensor networks, which includes a large number of active RFID tags, we propose RFID multi-hop relay system using active RFID relay tags. To compare the performance of the existing ISO/IEC 18000-7 with that of the proposed RFID multi-hop relay system, we introduce new system efficiency and sensitivity-based measures of the achieved coverage. Also, we analyze the performance of the proposed system and compare it with that of the existing system through the analyses of minimum coupling loss (MCL) and system level simulation (SLS).

An ONU design for EPON-based access network

Ethernet passive optical network (EPON) is an emerging access network technology that provides a low-cost method of deploying optical access lines between a carriers central office (CO) and a customer site. The EPON can provide more bandwidth than xDSLs which are most widely deployed broadband solutions. In this paper, we propose a cost effective structure of optical network unit (ONU) for EPON. The proposed ONU is suitable for apartment that is a typical residential model in Korea. The ONU system can process layer 2 functions such as VLAN, bandwidth management, priority control, etc. In addition to these layer 2 functions, other services, such as L2 IGMP snooping, can be deployed easily.

Design and implementation of wireless sensing platform based on UHF RFID technology

ISO/IEC 18000-6REV1 defines new protocols supporting a battery assisted passive (BAP) RFID sensor tag which is compatible with EPCglobal Class-1 Generation-2 specification. In this paper, we developed a RFID reader system supporting a BAP RFID sensor tag using a field programmable gate array (FPGA) and implemented sensing data processing function in embedded linux platform. The receiving block of the reader modem uses Gardner TED to synchronize symbol timing. We tested the RFID reader and sensor tags in wireless demonstration network. The developed RFID sensor tag system could recognize a RFID sensor tag in wireless environment and display the sensing data in real-time.

Design of a Tag Antenna for UHF RFID Food Systems

This paper proposes a tag antenna for radio frequency identification (RFID) food system. The RFID tag antenna is designed and fabricated based on the rectangular loop concept used in the UHF band (Korean and Japanese standards, 916.7 923.5 MHz). The proposed tag antenna is composed of a radiation patch, sensor tag chip, temperature sensor, oscillator, and battery. We conjugated matching between the tag antenna and the sensor tag using a U-shaped stub. Details of the proposed tag antenna design and the simulated and measured results are presented and discussed.

A Design and Implementation of ATCA based EPON Blade

The Advanced TCA is a relatively new open industry specification for building high-performance telecommunications and data communications systems. In this paper, we propose a cost effective EPON blade based on ATCA system which can provide support for multi-protocol interfaces at rates as high as 40 Gbps. ATCA system also provides high levels of modularity and configurability, allowing a range of vendors to drive competitive solutions to market. In this paper, we use Zone3 backplane as well as Zone2 backplane to provide eight EPON links in a standard I/O blade. Since the proposed EPON blade is designed to be compatible with an ATCA system, it is easy to integrate a high performance system with a reduced time and low costs.

Design and implementation of long-range RFID reader for sensor tag system

ISO/IEC 24753 defines new modem specifications for long-range RFID communications and application protocol for sensor tag system. According to the ISO/IEC 24753, the frequency offset of the tag is 4%. In this paper, we designed a non-coherent receiver structure to solve the frequency offset problem. A frequency estimation block was designed to mitigate the effects of 4% frequency offset and a start frame delimiter (SFD) detection algorithm was proposed to determine the start position of the payload. We implemented a long-range RFID reader with the proposed methods and evaluated its performance in a wired network. The implemented long-range RFID reader showed more superior performance than the commercial RFID reader.