Automatic gain control and antenna selection method for a radio communication system
AssigneeRealtek Semiconductor Corp.
InventorsDer-Zheng Liu, Song-Nien Tang, Tai-Cheng Liu, Kuang-Yu Yen
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Abstract
The invention provides an automatic gain control and antenna selection method used in a receiver of a radio communication system. The received signal power is estimated by digital signal processing after analog-to-digital conversion in the system, in order to adjust the gain of the front end analog signal until the magnitude of the analog signal is adjusted to an optimum range of the digital signal processing. In addition, the ADC is utilized to estimate the signal power as the basis of the antenna selection.
Claims15
A method for performing an automatic gain control (AGC) and an antenna selection in a receiver of a radio communication system, the method comprising the steps of:
- receiving an analog receiving signal by one of a first antenna and a second antenna of the receiver;
- amplifying the analog receiving signal by an amplification unit with a gain;
- converting the analog receiving signal into a digital receiving signal by an N-bit analog-to-digital converter (ADC);
- comparing the digital receiving signal with a saturation threshold value;
- decreasing the gain of the amplification unit by an adjusting value if the digital receiving signal is larger than or equal to the saturation threshold value;
- and
- selecting one of the first and the second antenna to receive the analog receiving signal if the digital receiving signal is smaller than the saturation threshold value, wherein the saturation threshold value corresponds to N.
An apparatus for performing an automatic gain control (AGC) and an antenna selection in a receiver of a radio communication system, the apparatus comprising:
- a first antenna;
- a second antenna;
- a switch for selecting one of the first and the second antennas to receive an analog receiving signal;
- an amplification unit with a gain for amplifying the analog receiving signal;
- an N bits ADC for converting the analog receiving signal into a digital receiving signal;
- and
- a DSP module further comprising:
- a gain control unit for decreasing the gain of the amplification unit if the value of the digital receiving signal is larger than N bits;
- and
- a switch control unit for selecting one of the first and the second antenna to receive the analog receiving signal if the value of the digital receiving signal is smaller than N bits.
Dependencies are inferred from the claim text.