Samsung Electronics Co., Ltd.

Sei-Jei Cho

Soon-Young Yoon

In-Seok Hwang

Hoon Huh

Byung-Ki Kim

Jang-Hoon Yang

Hyun-Su Yoon

Heon-Ki Chae

A method is provided for transmitting a signal in a signal transmission apparatus of a communication system. Upon receiving a signal, the signal transmission apparatus determines a mode of the received signal, in which a power amplifier should amplify the signal; generates a mode control signal corresponding to a single mode, if the mode of the received signal is determined as the single mode; amplifies and transmits the received signal in the single mode according to the mode control signal; generates a mode control signal corresponding to a multi-mode, if the mode of the received signal is the multi-mode; and amplifies and transmits the received signal in the multi-mode according to the mode control signal.

Apparatus and method for transmitting a signal in a communication system

An apparatus and method for controlling a digital AGC in a communication system in which power changes significantly from frame to frame. In the digital AGC controlling apparatus, an SNR estimator estimates an uplink SNR of a next frame. A power measurer measures uplink received power of every frame. A gain calculator estimates uplink power of an nframe using an SNR estimate of an (n&#x2212;1)frame received from the SNR estimator and a received power measurement of the (n&#x2212;1)frame received from the power measurer, and calculates a gain to be applied to the nframe in the digital AGC using the uplink power estimate of the nframe.

Apparatus and method for controlling a digital automatic gain controller in an orthogonal frequency division multiple access communication system

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Seoul, South Korea

Sei-Jei Cho