Electronics and Telecommunications Research Institute

Jeen Hur

Byung Jo Kim

Seong-Su Park

Seong Su Park

Sung-Yool Choi

Hoo Sung Lee

Kyoung-Ik Cho

Mun-Cheol Paek

Sang Baek Han

Gi-Pyung Han

Kyung Hwan Park

Sun Hee Kim

Kyu-Ha Baek

Seok-bong Hyun

Sun-hee Kim

Geum-Young Tak

Hee-Tae Lee

Sangbaek Han

Sung Pack Hong

Seok-Bong Hyun

The present invention provides an efficient data transmission method in BLUETOOTH broadcasting. The method of BLUETOOTH broadcasting generates a first broadcast packet and determines whether a slot is included in an access window. In a case where the slot is not included in the access window, a service interface (SI) information value is set to the assignment information of the slot. The first broadcast packet is then transmitted. A second broadcast packet is then generated and it is determined whether a slot is included in the access window. If the slot is not included in the access window, the SI information value is set to zero. The second broadcast packet is then transmitted. A slave receives the broadcast packets and obtains the SI information values. It is then determined whether the slave transmits data at the next odd numbered slot.

Bluetooth broadcasting method

Provided is a wireless packet communication method, and more particularly, a method and apparatus for enabling low-power communication by providing separate driving clocks optimized for a lower part for performing the function of a physical layer part and an upper part for performing the function of an upper layer above the physical layer in a wireless packet communication system. The method includes a first clock providing step of measuring actual data transmission and reception rates at a predetermined period, setting up a frequency (F) of a first clock based on the measured rates, and providing the first clock to the upper part and a second clock providing step of determining a transfer mode of the wireless packet communication system, detecting a frequency (F) of a second clock selected according to the determined transfer mode, and providing the second clock to the lower part.

Method and apparatus for providing dual variable clocks for low-power wireless packet communication

Provided are a pulse signal generator for UWB radio transception and a radio transceiver having the same. The pulse signal generator includes: an envelope generator generating a plurality of envelope signals; a local oscillator array composed of a plurality of high frequency oscillators, each outputting two oscillation signals having a phase difference from each other; a multiplier array receiving the envelope signals and the oscillation signals and outputting signals obtained by respectively multiplying the envelope signals by the oscillation signals; and an I channel adder and a Q channel adder outputting an I channel pulse signal and a Q channel pulse signal by adding output signals having the same phase components among the signals output from the multiplier array, respectively.

Pulse signal generator for ultra-wideband radio transception and radio transceiver having the same

The present invention relates to a Bluetooth-IP access system, and provides the Bluetooth-IP access system capable of performing broadband, large capacity and fast access by providing a Bluetooth-IP accessing device and a Bluetooth terminal with a module supporting broadband, large capacity, and fast search mounted therein.

Bluetooth-IP access system

In the adaptive wireless network system having a central optimizer and a method thereof, and in the record medium capable of being read through a computer having a writing of a program to realize the inventive method, in which information for a use wave environment of a corresponding subnet is gained from an access point regardless of a sort of wireless communication instruments so as to apply an optimum transmission/reception type of the corresponding subnet thereto; the system includes an optimizing unit for selecting optimum transmission/reception types of sub networks and transmitting them; an access point determining unit for providing node activity representative data and activity representative data of access point itself, to the optimizing unit, and determining it as the optimum transmission/reception type; and a communication node determining unit for re-determining its own transmission/reception type according to a requirement of the access point determining unit.

Adaptive wireless network system comprising central optimizer and method thereof

A triode-type field emission device includes an insulating substrate; a cathode formed on the insulating substrate; a field emitter aligned on the cathode, wherein the field emitter includes a plurality of emitter tips and each emitter tip has the diameter of nanometers; an insulating layer positioned around the field emitter for electrically isolating the field emitter; and a gate electrode formed on the insulating layer, wherein the gate electrode is closed to an upper portion of the field emitter. Therefore, the triode-type field emission device may be operable in a low voltage.

Triode-type field emission device having field emitter composed of emitter tips with diameter of nanometers and method for fabricating the same

Growing community of inventors

Taejon, South Korea

Jeen Hur