Apparatus and method for automatic gain control
An automatic gain control and control device technology, applied in the field of signal processing, can solve problems such as power distortion, no signal transmission, receiver saturation distortion, etc.
Active Publication Date: 2008-02-27
VIA TECH INC
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Problems solved by technology
However, there may be no effective signal transmission in phase B 224, that is, the sudden decrease in RF received signal power 210 occurring in phase B 224 is due to the fact that there is no real burst
At this time, the variable gain amplifier 104 still performs automatic gain control, and a higher amplifier gain value will be maintained, resulting in a waste of energy.
And when the B stage 224 is switched to the C stage 226, due to the high amplifier gain value, there is an effective signal burst again, and the signal power is amplified according to the high amplifier gain value, and a power distortion 242 will appear
This power distortion 242 would exceed the dynamic range of the A / D conversion, causing saturation distortion in the receiver
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[0021] The main purpose of the following description is to enable a person skilled in the art to use and manufacture the invention for specific applications and requirements. Various modifications to this preferred embodiment will be readily apparent to those skilled in the art, and the basic principles defined in the present invention may be applied to other embodiments as well. Therefore, the present invention is not limited to the specific embodiments described below, but only is consistent with the basic principles and novelty of the invention with the broadest scope.
[0022] The present invention proposes a burst signal detection device for radio frequency reception, and jointly calculates the current amplifier gain according to the detection result of the burst signal and the current received signal strength, and continuously updates and calculates the gain, so as to meet the system requirements . 3 to 5 have introduced a specific embodiment of the present invention. ...
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This invention provides a device for automatically controlling gains including: a burst-out signal tester for testing burst-out signals in the received process output result signals, when said signal is tested, the output burst-out indication signal is set to be a first specific value expressing that said effective burst-out signal is received, when the signal is not tested, the output indication signal is set to be the second specific value expressing the signal is not received and a control device for controlling generation of controllable gains, and a counter counts said indication signals of the second specific value and outputs test result used in controlling refreshment and storage of the gain values and then the control device computes gain needed currently based on the indication signals and outputs gain control indication to adjust the gain value of the variable gain amplifier.
Description
technical field [0001] The present invention mainly relates to the signal processing of the receiving end in the wireless communication system, and specifically relates to an automatic gain control receiving device for detecting the signal burst in the received signal. Background technique [0002] During digital reception in a wireless communication system, the dynamic range of the A / D conversion is limited by the signal power. In the wireless receiving device, due to the influence of electrical characteristics and propagation paths, the signal power of the received signal is different. When the power of the digital signal exceeds the dynamic range of the wireless receiving device, distortion or even wrong reception of the received signal will occur. Correspondingly, the power of the received signal needs to be adjusted to adapt to the dynamic range of the analog-to-digital conversion. Therefore, an automatic gain control device (AGC, automatic gain controller) is added to ...
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Login to View More IPC IPC(8): H04B7/005H04B1/12H03G3/20
Inventor 张丽君张剑玮易辉吴晏雷敏
Owner VIA TECH INC