ETRI, with the cooperation of a few industrial firms, has been successful in development of MIMO-OFDM based high-speed WLAN baseband chipset which is compliant with the IEEE 802.11n D.3.0 specifications, offering a maximum of 270Mbps in the physical layer. In year 2007, a fully integrated chipset version covering IEEE 802.11a/b/g/e/n/i standards with backward compatibility has been developed.
Plus, 2x3 RF chip designed/suited specifically for integration into ETRI's high-speed WLAN baseband chipset has been finalized as well. With the aid of this RF chip fabrication, a single system-on-chip design (integrated form of high-speed WLAN baseband chipset and RF chip into a single-chip) will be under development in the year 2008.
This one-chip design is expected to provide solutions for dual-mode mobile phones, an incorporated version including functions of WLAN, VoIP phone and mobile phone, as well as MoIP (Multimedia over IP) terminals. In addition, an integrated chipset targeted for imbedded applications, which includes ARM processor, is currently under development.
The IEEE 802.11n standard is operated in both 2.4GHz and 5GHz frequency bands. In the 2.4GHz band, IEEE standard 802.11b/g/n is applicable while IEEE 802.11a/n mode is operated in the 5GHz band. Its channel bandwidth usage is 20/40MHz with application of the latest the MIMO technology.
The mandatory maximum data transfer rate required in the physical layer operating in AP mode is 130Mbps. However, depending on implementation, maximum data transfer rate up to 600Mbps can be achieved in an optional mode. Now we are focusing on development of VHT(Very High Throughput) technology which provides 1 Gbps data rate in LAN access.
We search the new frequency resources in millimeter wave band. Our R&D topics are focusing on the development of wireless transmission techniques for connecting radio HDTV signals with the cable and satellite broadcasting set-box, the game console, DVD player, the camcorder, and a portable type multimedia equipment.
These are wireless HD-SDI (High Definition Serial Data Interface)/DVI (Digital Visual Interface) techniques where it will be applied to the LCD, PDP, and next generation DVD player. They consist of Multi-Gbps mmW (millimeter Wave) WLAN, WPAN and WSAN (Wireless System Area Network) techniques which will be used in the external hard disk and memory.
From this research, we develop the beam steering, adaptation wireless transmission technique, channel coding, high-speed QoS (Quality of Service) MAC control, and situation recognition MAC control scheme which are suitable for millimeter wave wireless transmission.
LTE means the OFDM based cellular system which is currently under way of standardization in 3GPP and the basic objectives of 'Development of UE modem Chip Set for LTE' are development of modem chip set which supports 50 Mbps data rate at 120 km/hr and development of modem control SW, L2/L3 SW and API SW.
Effective MIMO receiver algorithm, efficient SW structure for DRX/DTX support, handover cell search algorithm for low power saving in idle or active state and mobile station platform structure for high data rate are main contents of the development.
This project focuses on acquiring the import replacing capability and promoting the export of the technology by providing the chip set technology and protocol stack solution for domestic manufacturers.
Research on mobile communication RF system technologies
Research on next-generation mobile communication RF technologies
Existing 2G/3G channel models cannot completely satisfy the necessary technical needs for next generation system developments. The standard for next generation mobile communication system wireless channel model must include features of high-speed transmission, high efficiency of frequency, and multiple antenna technology.
To achieve this, ETRI is pursuing development of a wireless channel model reflecting Korean propagation environment and a wireless channel parameter that considers the portability and multiple antenna technologies for the next generation of mobile communication system development where broad band channels (10~100MHz) and high transmission rates (over 100Mbps) are required.
Since MIMO multiple antenna wireless channel system (BECS2006: Band Exploration and Channel Sounder 2006) was developed in 2006, we have been performing wireless channel field measurements nationwide for statistical representation reflecting the characteristics of domestic topographies and natural features.
We are developing the optimal algorithm and statistics processing based data DB build-up for the radio channel parameter extraction based on substantial measured data.
Additional developments include wireless spatial channel parameter measurement and estimation techniques, MIMO spatial channel analysis post processing S / W and channel model integrated development environment.
Wireless Vector Channel Model for next generation mobile communication transmission technology will be utilized for transmission technology verification. ETRI research will reflect the Wireless Vector Channel Model standards and stay ahead of industry trends by participating in international standards organizations (ITU-R WP5D, ITU-R 3J/K etc).