Samsung Electronics Co., Ltd.

Sungkyunkwan University

Jun-Kyu Kang

Dong-hwan Kim

Dong-In Ha

Wan-Jin Choi

Hoon Jong Kang

Ji-Yun Seol

Jae-Yong Lee

Hun-Kee Kim

Su-Jin Kim

Jung-Ho Park

Bong-Gee Song

Yun-Sang Park

Hyung-Jin Choi

Sang-Min Bae

Tae-Gon Kim

Jae-Hwan Chang

Su-jin Kim

Hee-Jin Roh

In-Tae Kang

Se-Bin Im

Min-Cheol Park

Young-ik Cho

Young-Hak Kim

Su-Jin Yoon

Hae-Dong Yeon

In-Hyoung Kim

Bo-Rham Lee

Hoon Chul Kang

Se-bin Im

Jeoung-Gil Lee

Chang-hyun Baik

Tae-Keun Oh

Jeong-Gil Lee

Dae-Hong Lee

Byung-Yoo Ahn

Chang-Hyun Baik

A method is provided including: detecting an activation of an electronic device; detecting a current location of the electronic device; detecting whether the activation is prohibited at the current location of the electronic device; and shutting down the electronic device when the activation is prohibited.

Restricting the operation of an electronic device

A method and an apparatus for reducing Digital-to-Analog Conversion (DAC) bits at a transmitter of a Frequency Division Multiple Access (FDMA) system reduces a number of the bits for conversion so as to save power and reduce the cost of operation. The method can include generating a digital signal gain control value and an analog signal gain control value using subcarrier allocation information, a required Signal to Noise Ratio (SNR), and a Peak to Average Power Ratio (PAPR); controlling a gain of a signal input to a digital-to-analog converter using the digital signal gain control value; converting a digital signal of the controlled gain to an analog signal using the digital-to-analog converter; and restoring an original signal by controlling a gain of a signal output from the digital-to-analog converter using the analog signal gain control value.

Method and apparatus for reducing digital to analog conversion (DAC) bits in frequency division multiple access (FDMA) system

A correlation apparatus and method for frequency synchronization are provided. A frequency synchronization method of a receiver in a broadband wireless access communication system includes acquiring a highest correlation value by conducting a differential correlation of a variable interval between a received signal and a reference signal and performing a frequency synchronization according to the highest correlation value.

Correlation apparatus and method for frequency synchronization in broadband wireless access communication system

A method for modulating a symbol in a transmitter of an Orthogonal Frequency Division Multiplexing (OFDM) system. The symbol modulation method includes multiplying an input stream of an Inverse Fast Fourier Transform (IFFT) unit by a Twiddling factor for circular-shifting the input stream of the IFFT unit by a Cyclic Prefix (CP) length; performing IFFT on the input stream of the IFFT unit, which is multiplied by the Twiddling factor; buffering data corresponding to the CP length beginning from a front of an output stream of the IFFT unit; and generating an OFDM symbol by forward-copying the buffered data to a back of the output stream of the IFFT unit.

Method and apparatus for modulating symbols in an orthogonal frequency division multiplexing system and transmission apparatus using the same

A method and apparatus for processing time windowing to transmit a signal in a Broadband Wireless Access (BWA) communication system based on Orthogonal Frequency Division Multiple Access (OFDMA). A signal of a first interval included in a previous symbol prior to a current symbol is stored as a signal of a previous symbol interval. The current symbol includes a guard interval and an effective symbol interval subsequent to the guard interval. The current symbol is windowed by overlapping the stored signal of the first interval with a signal of a second interval included in the current symbol subsequent to the previous symbol. A windowed signal is transmitted.

Method and apparatus for transmitting a signal in a communication system

There is provided a built-in single band antenna device and an operating method thereof in a mobile terminal. In the built-in antenna single band antenna device, a built-in single band antenna is formed into a conductive pattern on a board extended from the upper side of a main PCB. A whip antenna is connected to the built-in single band antenna, and contained in the mobile terminal when the whip antenna is retracted. A whip antenna driver extends or retracts the whip antenna. A duplexer separates an RF signal received from the built-in single band antenna from an RF signal to be transmitted to the built-in single band antenna. A controller processes the RF signals received at and transmitted from the duplexer and controls the whip antenna driver to extend the whip antenna in a speech state or upon a call attempt from a user.

Built-in single band antenna device and operating method thereof in mobile terminal

A mobile communication system has a multi-band antenna capable of receiving and processing signals of GPS, CDMA, and PCS bands. In the system, a GPS processing section receives a signal of a first frequency band, so as to generate global positioning information. A communication signal processing section receives signals of a second frequency band lower than the first frequency band and a third frequency band higher than the first frequency band, demodulates the received signals , while modulating signals to be transmitted of the second frequency band and the third frequency band and outputting the modulated signals. The multi-band antenna has a dual-pitch helical antenna which includes first and second helical coil portions having different pitches, so that the first and second helical coil portions have different impedances for the signals of the first to third frequency bands. A frequency band separator section connected between the multi-band antenna and the GPS processing section and communication processing section supplies the signal of the first frequency band to the GPS processing section while supplying the signals of the second and third frequency bands to the communication processing section.

Mobile communication system having multi-band antenna

There is provided a helical antenna structure, which exhibits minimal influence from contact with a human body in a mobile terminal. In the helical antenna structure, a cap protrudes from an upper end of the mobile terminal, and a winding coil is formed within the cap, which is spaced from an outer surface of the cap substantially the same distance from a bottom part of the cap to a top part of the cap.

Helical antenna structure in a mobile terminal

Disclosed are a built-in dual band antenna device and an operating method thereof in a mobile terminal. In the built-in antenna dual band antenna device, a built-in dual band antenna has a first conductive antenna pattern formed on a board extended from the upper side of a main PCB and a second conductive antenna pattern on a board extended at a right angle from the upper side of the main PCB. A whip antenna is connected to the built-in dual band antenna, and contained in the mobile terminal when the whip antenna is retracted. A whip antenna driver extends or retracts the whip antenna. A duplexer separates an RF signal received from the built-in dual band antenna from an RF signal to be transmitted to the built-in dual band antenna. A controller processes the RF signals received at and transmitted from the duplexer and controls the whip antenna driver to extend the whip antenna in a speech state or upon a call attempt from a user.

Built-in dual band antenna device and operating method thereof in a mobile terminal

Growing community of inventors

Seoul, South Korea

Jun-Kyu Kang