The Farrell Law Firm, LLP
Automatic gain control apparatus and method in orthogonal frequency division multiplexing
Disclosed is an automatic gain control device in an orthogonal frequency division multiplexing system. A variable gain amplifier controls a gain of an input signal; an energy calculator calculates an energy of the input signal; a truncator accumulates the calculated energies, finds an average thereof, and generates a DC offset of the input signal; a subtracter subtracts a predefined reference value from the DC offset, and outputs a signal; and an RC filter feeds the value output by the subtracter back to the variable gain amplifier so that the value output by the subtracter may be used for an automatic gain control. The predefined reference value given to be 4.Ov is a reference power generated based on a saturation to RMS ratio for minimizing the bit error rate of the orthogonal frequency division multiplexing system.
Electronics and Telecommunications Research Institute Hanaro Telecom, Inc. KT Corporation KTFreetel Co., Ltd. SK Telecom Co., Ltd. Samsung Electronics Co., Ltd.
H H H
H04L H04L H03G
additional inventional inventional
Dae-Ho Youn-Ok Yong-Su Jun-Woo
Kim Park Lee Kim