Electronics and Telecommunications Research Institute

Hyung-Rae Park

Jong-Suk Chae

Chang-Joo Kim

Myung-Sun Song

Sung-Hyun Hwang

Seung-Il Myong

Heyung-Sub Lee

Bub-Joo Kang

Jongsub Cha

Sang-Hyun Mo

Gwang-Zeen Ko

Provided is an apparatus and method for transmitting packet data in a WSN. The apparatus for transmitting packet data in a WSN includes: a serial-to-parallel converter to parallel-convert information and output the converted information to two channel paths; a Walsh code pair generation unit to select an arbitrary Walsh code pair, mix the selected Walsh code pair with a pseudo noise (PN) code, and output one Walsh code to one channel path and the other Walsh code to the other channel path; a first mixer to mix the signals inputted to two channel paths, and generate a spread symbol for each path; a delay to delay the other channel path signal by a predetermined time; and a transmission unit to convert one channel path signal and the other channel path signal delayed by the delay into transmission frequency band signals, and transmit the converted signals as wireless signals.

Apparatus and method for transmitting packet data in wireless sensor network

There is a provided a method for managing a multiple frequency assignment using a terminals RX performance in an orthogonal frequency division multiple access (OFDMA) wireless regional area network (WRAN) system, including: a) measuring a bit energy/noise power spectral density (Eb/No) and a received signal strength indicator (RSSI) which are received in the terminal; b) informing the measured Eb/No and RSSI of a base station; c) calculating a round trip delay (RTD) in the base station; d) determining a terminal performance level based on the measured Eb/No, RSSI and the calculated RTD; and e) determining a frequency channel and modulation scheme based on the determined performance level.

Method for managing multiple frequency assignment using terminal's received performance in OFDMA WRAN system

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Gyeonggi-do, South Korea

Hyung-Rae Park