Gain automatic correction method and transmitter

Abstract

The invention discloses a gain autocorrection sending machine, which comprises: an input digital power detection module for receiving the baseband signal, obtaining the incoming signal digital power based on the baseband signal; a signal processing module for processing the baseband signal from the input digital power detection module and outputting the radiofrequency signal, a power output module for magnifying and outputting the radiofrequency signal of the signal processing module, and regulating the gain of the radiofrequency signal based on the incoming signal digital power obtained by the input digital power detection module, the output signal digital power obtained by an output power digital detection module; the output power digital detection module for coupling the radiofrequency signal of the power output module, and obtains the output signal digital power based on the radiofrequency signal. The embodiment of the invention overcomes the average effect of the simulate detection in prior art, achieves the gain calibration in real time.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a gain automatic correction method and a transmitter. Background technique [0002] In the communication system, the downlink baseband signal enters the analog channel after being processed by the digital part, and after analog modulation, it is amplified by radio frequency and output to the antenna interface. The wireless characteristics such as the coverage of the base station require that the downlink channel must ensure a stable gain, so as to ensure that the antenna interface outputs a power equal to the expected power, thereby meeting the requirements of the wireless characteristics. However, the devices that make up the downlink channel (signal conversion, shaping filter, digital domain carrier combination, clipping, digital-to-analog conversion (DAC), IQ modulation, and up-conversion) will fluctuate due to factors such as device batches, temperature, and frequency....

AI Technical Summary

Problems solved by technology

However, due to the average effect of the output of the analog power detector, it cannot reflect the output power in real time

For example, in the Wimax system, the power of the preamble area and the data area are not equal. If an analog power detector is used to distinguish the power of the preamble area from the power of the data area, there will be errors in the gain control, and due to the averaging effect, when the power changes, It is also impossible to confirm whether it is caused by a change in the actual power or a change in the duty cycle of the emission; through further research, the inventor also found that the prior art cannot correct temperature changes or frequency changes to the output power detection module as before. Effects on analog power detectors, changes in output power detection due to changes in temperature or frequency can cause fluctuations in gain control, which in turn can cause fluctuations in channel gain due to changes in temperature or frequency

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