BROWSE
Detail
Registered AUTOMATIC GAIN CONTROL APPARATUS AND METHOD IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING
- Inventors
- Yong Su Lee, 박윤옥, Kim Jun-Woo, Kim Daeho
- Application No.
- 10583164 (2004.12.17)
- Publication No.
- 20070248197 (2007.10.25)
- Registration No.
- 7782977 (2010.08.24)
- Country
- UNITED STATES
- Abstract
- 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.
- KSP Keywords
- Automatic Gain Control(AGC), Bit Error Rate(And BER), Control device, DC-offset, Frequency division, Frequency division multiplexing, Gain Control, Input signal, Orthogonal frequency division Multiplexing(OFDM), RC Filter, Reference value, Variable Gain, Variable Gain Amplifier(VGA), bit error, division multiplexing, error rate