AUTOMATIC GAIN CONTROLLER PERFORMING AUTOMATIC GAIN BEFORE MODULATING A TRANSMISSION SYMBOL MODULATED BY A HIGH ORDER QAM(QUADRATURE AMPLITUDE MODULATION) METHOD, OFDM(ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING) RECEIVER USING A HIGH ORDER QAM METHOD, A MANUFACTURING METHOD OF THE DEVICE

摘要

PURPOSE: An automatic gain controller, an OFDM(Orthogonal Frequency Division Multiplexing) receiver using a QAM(Quadrature Amplitude Modulation) method using the device, and a manufacturing method of the device are provided to prevent performance degradation of an OFDM receiver.;CONSTITUTION: An automatic gain controller(500) includes a power calculation unit(510) and a gain control unit(520). The power calculation unit calculates power of a signal received from an OFDM receiver. The power calculation unit receives data about IQ coordinate on a constellation map with respect to a modulated signal using a high order QAM method and calculates power of a received signal. The gain control unit controls a gain of the received signal based on the calculated power. The gain control unit controls the gain of the received signal using the inverse of the square root of power.;COPYRIGHT KIPO 2013;[Reference numerals] (500) Automatic gain controller; (510) Power calculation unit; (520) Gain control unit; (AA) Reception signal; (BB) Power