Digital automatic gain control method of communication system and control system thereof
An automatic gain control and communication system technology, applied in wireless communication, power management, electrical components, etc., can solve the problem of large fluctuation in the expected value of the output signal, and achieve the effect of reducing the difficulty of implementation, avoiding fluctuation and accurate gain control
Active Publication Date: 2012-08-29
COMBA TELECOM SYST CHINA LTD
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[0007] In order to solve the problem that the output signal of the digital automatic gain control method of the communication system in the prior art fluctuates greatly relative to the expected value, the present invention provides a digital automatic gain control method of the communication system whose output signal fluctuates less than the expected value
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[0033] In the digital automatic gain control method of the communication system of the present invention, the signal strength of the output signal is sensed and quantified into a measurement value, and the strength level of the output signal is judged according to the measurement value, and then the frequency of occurrence of each strength level is determined during the measurement of the output signal. Statistically, when the occurrence frequency of the intensity level exceeds a certain value, the value of the gain adjustment parameter is triggered to change, and the gain value compensated for the input signal is adjusted according to the value of the gain adjustment parameter. Therefore, the intensity of the output signal can be reflected more accurately, so that the gain control is more accurate. At the same time, the output signal is less disturbed by the noise in the input signal, and the excessive fluctuation of the output signal relative to the expected value is avoided....
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The invention provides a digital automatic gain control method of communication system and a control system thereof. The method comprises the following steps: sensing signal intensity of output signals and quantizing the signal intensity as measured value calculation; judging strength grades of output signals according to the measured value and then carrying out statistics on frequency of occurrences of all strength grades in the process of measuring signal intensity of output signals; triggering value of gain adjustable parameter to change when frequency of occurrences of all strength gradesexceeds a preset value; adjusting gain value compensated to input signals according to the value of the gain adjustable parameter. With the control method and the control system of the invention adopted, output signal can converge to an expected value and tends not to fluctuate much. Meanwhile, as input signal gain value can be calculated by relatively simple operation alone, thus lowering difficulty for realization.
Description
technical field [0001] The invention relates to a digital automatic gain control method of a communication system, and also relates to a digital automatic gain control system of a communication system. Background technique [0002] The mobile communication channel is a complex communication channel, which has the characteristics of fast fading, slow fading and multipath superposition, and the fading depth can reach tens of dB. This fading causes the received signal to have a large power variation range, which deteriorates the demodulation performance of the system. [0003] In the mobile communication channel, DAGC (Digital Automatic Gain Control) is usually used to adjust the power of the input digital signal, so that when the output signal strength changes, the strength of the output signal can basically remain unchanged; and the output signal is truncated , to reduce the implementation burden of the subsequent baseband signal processing algorithm, increase its implementa...
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IPC IPC(8): H04W52/04
Inventor 许鸿辉施英
Owner COMBA TELECOM SYST CHINA LTD