Korea Electrotechnology Research Institute

Electronics and Telecommunications Research Institute

Soongsil University

Won Cheol Lee

Hyung Min Chang

Woo Yong Lee

Young Jin Park

Woon-Yong Park

Seung Eun Hong

Kapseok Chang

Kwan Ho Kim

Yoan Shin

Mun Geon Kyeong

Sungsoo Choi

Yo An Shin

E Rang Lim

Soon Woo Lee

Ji Myung Kang

Kwan-Ho Kim

Hui-Myung Oh

Youngjin Park

A wireless positioning server using clock offset compensation and a wireless positioning method using the same. The wireless positioning server using clock offset compensation estimates a precise position of a tag requiring position information by effectively predicting information regarding a distance between a beacon for performing positioning and the tag requiring position information. An error in the positioning estimation result due to a clock offset is minimized by measuring a relative clock frequency ratio between beacons and by compensating for clock frequencies of the beacons when a distance between a beacon and a tag is estimated.

Wireless positioning server using clock offset calibration positioning method using the same

Provided is a sequential transmission multi-beamforming apparatus and method with a low complexity based on a Hadamard matrix. A simple codebook may be generated based on the Hadamard matrix and thus, a number of weighted-vectors is reduced and a complexity of hardware is decreased. A diversity gain may be maximized based on a spatial diversity processing apparatus and a beamforming weighted vector may be systematically generated.

Sequential transmission multi-beamforming method with low complexity using Hadamard matrix

Disclosed is a wireless positioning system and method that can perform a high-precision position tracking. The wireless positioning system includes a target device that is an object of wireless positioning, beacon devices and a processing unit. The beacon devices transmits wireless signals and sense reception time points of the wireless signals transmitted from the other beacon devices and the target device and received at time points after the transmission of the wireless signal. The target device receives the wireless signal transmitted from at least one of the beacon devices, and then transmits the wireless signal to the beacon devices. The processing unit obtains the position of the target device by calculating distances between the beacon devices and the target device using information about the reception time points of the wireless signals sensed by the respective beacon devices.

System and method for asynchronous wireless positioning by ordered transmission

Growing community of inventors

Seoul, South Korea

Won Cheol Lee