Communication system over a power line distribution network
View Patent ↗The present disclosure provides a system for receiving signals over a power line distribution. Typically, problems of noise and interference are being solved at the receiver side. Systems of the present disclosure, however, are not limited to the receiver-side solution. Systems according to the present disclosure may also be used at the transmitter side. The receiver comprises a high pass filter, a preselect crossover filter, and an analog front-end receiver architecture.
1. A power line communication system for receiving a power line communication signal being a frequency-division multiplexed signal, the system comprising:
a crossover filter for distributing the received power line communication signal over a number (N) of frequency bands, where N>=2; and
a low-noise amplifier configured to receive the N frequency bands as inputs and generate an output for each of the N frequency bands, the low-noise amplifier comprising:
N attenuators, each attenuator configured with an output switch, wherein each attenuator of the N attenuators is configured to receive one predetermined frequency band of the N frequency bands as an input and generate an attenuated output of the one predetermined frequency band of the N frequency bands, wherein each output switch of the N attenuators is configured to receive and switch the attenuated output;
a single amplifier, placed in parallel with the N attenuators, configured to generate an amplified output for an input frequency band, and
at least N switches configured to switch the input frequency band to the single amplifier between the N frequency bands,
wherein, in response to a given frequency band containing a strong interferer, the low-noise amplifier is configured to provide the attenuated output of an attenuator associated with the given frequency band via the output switch of the attenuator associated with the given frequency band, and
wherein, in response to the given frequency band not containing a strong interferer, the low-noise amplifier is configured to provide the amplified output of the single amplifier for the given frequency band.
2. A power line communication system as in claim 1 , further comprising an analogue-to-digital converter for converting the filtered frequency-division multiplexed signal at the intermediate frequency.
3. A power line communication system as in claim 1 , further comprising a frequency conversion circuit for converting the received power line communication signal to a signal at an intermediate frequency.
4. A power line communication system as in claim 3 further comprising: a low-pass filter, wherein the low-pass filter is adapted for performing channel filtering on the frequency-division multiplexed signal at the intermediate frequency.
5. A power line communication system as in claim 4 , wherein the low-pass filter is a Gm-C filter.
6. A power line communication system as in claim 5 , further comprising a calibration circuit for adapting the cut-off frequency of the Gm-C filter.
7. A power line communication system as in claim 6 , wherein the calibration circuit is a stabilization loop comprising a variable gain amplifier, the stabilization loop being arranged for updating filter parameters due to non-idealities.
8. A power line communication system as in claim 3 , wherein the single amplifier comprises a plurality of gain stages.
9. A power line communication system as in claim 1 , further comprising at least one Variable Gain Amplifier for optimizing the level of the power line communication signal.
10. A power line communication system as in claim 1 , further comprising a high pass filter for pre-filtering the power line communication signal.
11. A power line communication system as in claim 1 , wherein the single amplifier is connected in parallel to the N attenuators.
12. A power line communication system as in claim 11 , wherein at least one attenuator of the N attenuators comprises a ladder network with a plurality of attenuation sections.
13. A power line communication system as in claim 1 further arranged for transmitting a power line communication signal.
14. A power line communication system as in claim 1 , wherein the system is fully integrated on chip.
15. A method for receiving a power line communication signal, over a power line, the communication signal being a frequency-division multiplexed signal, comprising:
filtering the received power line communication signal with a crossover filter for distributing over a plurality of frequency bands; and
for each frequency band of the plurality of frequency bands:
receiving the frequency band as an input for an attenuator dedicated to the frequency band,
generating an amplified output for an input frequency band using a single amplifier,
switching the input frequency band to the single amplifier between the frequency bands,
generating an attenuated output for the frequency band using the attenuator dedicated to the frequency band when the frequency band contains a strong interferer via an output switch, wherein the output switch is configured to receive and switch the attenuated output, and
generating an amplified output for the frequency band when the frequency band does not contains the strong interferer via the single amplifier for all frequency bands of the plurality of frequency bands.
16. The method of claim 15 , further comprising:
amplifying the power line communication signal.
17. The method of claim 15 , further comprising:
switching a low noise amplifier to each of the plurality of frequency bands.
18. The method of claim 15 , further comprising:
adjusting the level of the power line communication signal with a Variable Gain Amplifier.