Micro-controller, processing method and device for power line carrier signal reception
The present invention provides a micro-controller, a processing method and device for power line carrier signal reception, where the method includes: an analog mixer mixes received power line carrier signals, an analog filter filters the mixed power line carrier signals, an analog-to-digital converter converts the filtered signals, a digital mixer mixes converted signals, a digital filter filters the mixed signals and a digital demodulator demodulates the filtered signals to obtain base band data. The present invention also provides a corresponding device and a micro-controller including the device. The technical solution of the present invention can modulate the carrier signals of any frequency to a fixed frequency through two-stage frequency mixing, so that demodulation of power line carrier signals with any frequency is possible.
1. A processing method for power line carrier signal reception, comprising:
by a low noise amplifier, amplifying received analog signals according to an control signal and sending the amplified signals to an analog mixer;
frequency mixing, by the analog mixer, received power line carrier signals, wherein a frequency of the mixed signals is within a band-pass of an analog filter;
filtering, by the analog filter, the mixed signals;
performing an analog-to-digital conversion of the filtered signals, and frequency mixing, by a digital mixer, the converted signals, wherein a frequency of the mixed signals is within a band-pass of a digital filter;
by the digital filter, filtering the mixed signals, and sending the filtered signals to a digital demodulator;
performing, by the digital demodulator, demodulation of the filtered signals to obtain base band data;
computing, by a parameter collect module, an output energy parameter of the digital demodulator; and
generating, by a gain control module, the control signal for the low noise amplifier according to the output energy parameter.
2. The method according to claim 1 , further comprising:
amplifying, by a programmable gain amplifier, the power line carrier signals immediately before the analog-to-digital conversion according to the control signal.
3. The method according to claim 1 , wherein frequency mixing, by the analog mixer, the received power line carrier signals comprises:
frequency mixing, by the analog mixer, the received power line carrier signals immediately after amplifying, by the low noise amplifier, the received analog signals.
4. A processing device for power line carrier signal reception, comprising:
a low noise amplifier, configured to amplify received power line carrier signals according to an control signal and send the amplified signals to an analog mixer;
the analog mixer, configured to frequency mix received power line carrier signals, wherein a carrier frequency of the mixed signals is within a band-pass of an analog filter;
the analog filter, configured to filter the mixed signals;
an analog-to-digital converter, configured to perform an analog-to-digital conversion of the filtered signals;
a digital mixer, configured to frequency mix the converted signals, wherein a carrier frequency of the mixed signals is within a band-pass of a digital filter;
the digital filter, configured to filter the mixed signals and send the filtered signals to a digital demodulator; and
a parameter collect module, configured to compute an output energy parameter of the digital demodulator; and
an automatic gain control module, configured to generate the control signal for the low noise amplifier according to the output energy parameter.
5. The device according to claim 4 , further comprising:
a programmable gain amplifier, configured to amplify or attenuate the power line carrier signals immediately before the analog-to-digital conversion according to the control signal.
6. The device according to claim 4 , wherein the analog filter is a ceramic filter.
7. The device according to claim 4 , wherein: the analog mixer is further configured to frequency mix received power line carrier signals immediately after the low noise amplifier amplifies the received power line carrier signals.
8. A micro-controller, comprising: a central processing unit, a power line coupling circuit and the processing device for power line carrier signal reception according to claim 4 , wherein the central processing unit is configured to control the processing device for power line carrier signal reception, the power line coupling circuit is configured to separate the power line carrier signals from received power line signals and send the power line carrier signals to the processing device for power line carrier signal reception.
9. The micro-controller according to claim 8 , wherein the central processing unit is configured to control local oscillator frequencies of the analog mixer and the digital mixer.