Samsung Electronics Co., Ltd.

Ajou University Industry-academic Cooperation Foundation

Kyu Man Lee

Jae Sung Lim

Tae Sung Kim

Sergey Zhidkov

Jin Y Chung

Hong Jun Noh

Gi Bong Jeong

Ki Hyoung Kim

Dong Hyun Kang

A time division multiple access frame structure includes a signal transmission section allocated for transmitting reference signals from a plurality of ground reference stations; a relay section for relaying the transmitted reference signals by a plurality of aeronautical satellite relay stations selected by a central station; and a data transmission section for data transmission of the central station, the plurality of ground reference stations, or the plurality of aeronautical satellite relay stations, wherein the signal transmission section, the relay section, and the data transmission section are time division multiplexed with each other.

Positioning method based on time division multiple access, positioning system, and frame structure used therein

The present invention generally relates to a random access method and apparatus based on analog network coding for a satellite network and, more particularly, to technology that combines analog network coding with random access, thus guaranteeing high channel usage efficiency upon utilizing the technology for a satellite positioning/communications convergence system. For this, a random access apparatus based on analog network coding for a satellite network according to an embodiment of the present invention includes a received signal determination unit, a data packet transmission unit, a reserved slot decision unit, a response message reception unit, and a data packet decoding unit.

Random access method and apparatus based on analog network coding for two-way relay channel

A receiver includes a frequency converter configured to generate a I signal and a Q signal from each band of a multiband signal and a mismatch compensator configured to estimate a mismatch of the I signal and the Q signal for each of the bands of the multiband signal and store at least one compensation value to compensate for the estimated mismatch. The frequency converter compensates for the mismatch of the I signal and the Q signal based on the at least one compensation value.

Receiver capable of compensating for mismatch of I signal and Q signal and communication system including the same

An OFDM (orthogonal frequency division multiplexing) receiver is equalized by dividing each of a plurality of received OFDM symbols into a plurality of sub-symbols and outputting each of Fourier-converted signals corresponding to each of the sub-symbols, and estimating a channel response corresponding to each of the divided sub-symbols.

Growing community of inventors

Suwon-si, South Korea

Kyu Man Lee