A power line communication noise suppression device and a power line communication system

Abstract

The utility model discloses a kind of power line communication noise suppression device and power line communication system, including power line transmitting end module and power line receiving end module;Power line transmitting end module includes the double-stage encoding unit connected in turn, multiplexing modulation unit, mixed noise suppression unit;Double-stage encoding unit includes first stage encoder and second stage encoder, and first stage encoder is Turbo encoder, and second stage encoder is RS encoder;Multiplexing modulation unit includes orthogonal frequency division multiplexing modulator;Power line receiving end module includes iterative decoding unit, and iterative decoding unit includes soft output Viterbi algorithm decoder.The utility model is by designing a kind of fusion based on Turbo encoder and RS encoder double-stage encoding unit and based on soft output Viterbi algorithm decoder iterative decoding unit, and apply the noise suppression device of orthogonal frequency division multiplexing modulator, improve the anti-noise ability of power line communication, optimize the performance of power line communication system.

Description

Technical Field

[0001] This utility model relates to the field of power line communication technology, and in particular to a power line communication noise suppression device and a power line communication system. Background Technology

[0002] Power line communication (PLC) is a communication technology that uses existing power lines as the physical transmission medium to transmit information such as data, voice, and images. Its core idea is to "reuse power infrastructure," upgrading power lines from a single carrier of electrical energy to a comprehensive transmission platform of "electrical energy + information." The birth and development of this technology profoundly reflects the surge in demand for "ubiquitous connectivity" in the information age, as well as the trend of deep integration between traditional infrastructure and emerging information technologies.

[0003] As power line communication technology becomes more widespread in low-voltage power line communication scenarios such as smart grids and smart homes, its shortcomings are gradually becoming apparent. Traditional power line communication systems suffer from severe noise immunity and poor adaptability to dynamic noise, resulting in high consumption of communication resources while maintaining poor communication performance. Furthermore, the currently used single forward error correction coding has a high bit error rate in low signal-to-noise ratio environments, making it difficult to meet the millisecond-level latency requirements of smart grids. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a power line communication noise suppression device and a power line communication system. By designing a noise suppression device that integrates a two-level encoding unit based on a Turbo encoder and an RS encoder and an iterative decoding unit based on a soft-output Viterbi algorithm decoder, and applying an orthogonal frequency division multiplexing modulator and a hybrid noise suppression unit, the noise immunity of power line communication is improved, the performance of the power line communication system is optimized, and it meets the application requirements of smart grids.

[0005] This utility model provides a power line communication noise suppression device, which includes a power line transmitter module and a power line receiver module. The power line transmitter module is disposed at the input end of the power line, and the power line receiver module is disposed at the output end of the power line.

[0006] The power line transmitter module includes a two-level coding unit, a multiplexing modulation unit, and a hybrid noise suppression unit. The output of the two-level coding unit is connected to the input of the multiplexing modulation unit, and the output of the multiplexing modulation unit is connected to the input of the hybrid noise suppression unit.

[0007] The dual-level encoding unit includes a first-level encoder and a second-level encoder, wherein the first-level encoder is a Turbo encoder and the second-level encoder is an RS encoder;

[0008] The multiplexing modulation unit includes an orthogonal frequency division multiplexing modulator;

[0009] The power line receiver module includes an iterative decoding unit, which includes a soft-output Viterbi algorithm decoder.

[0010] Furthermore, the hybrid noise suppression unit includes a noise classification unit and a noise processing unit, wherein the noise classification unit is connected to the noise processing unit.

[0011] Furthermore, the power line transmitter module also includes a dynamic subcarrier allocation unit, which is disposed between the two-level coding unit and the multiplexing modulation unit.

[0012] Furthermore, the dynamic subcarrier allocation unit includes a spectrum sensing unit, an adaptive subcarrier allocation unit, and a subcarrier group redundancy unit. The output of the spectrum sensing unit is connected to the input of the adaptive subcarrier allocation unit, and the output of the adaptive subcarrier allocation unit is connected to the input of the subcarrier group redundancy unit.

[0013] Furthermore, the power line receiver module also includes an adaptive equalization unit, which is disposed at the input of the iterative decoding unit.

[0014] Furthermore, the adaptive equalization unit includes a subcarrier pilot unit, a minimum mean square error equalizer, and a cyclic prefix dynamic adjustment unit. The output of the subcarrier pilot unit is connected to the input of the minimum mean square error equalizer, and the output of the minimum mean square error equalizer is connected to the input of the cyclic prefix dynamic adjustment unit.

[0015] Furthermore, the power line receiver module also includes a demodulation unit, which is located at the input of the adaptive equalization unit.

[0016] Furthermore, the power line receiver module also includes a data verification unit, which is located at the output of the iterative decoding unit.

[0017] Furthermore, the power line receiving module also includes a data reconstruction unit, which is located at the output of the data verification unit.

[0018] This utility model also provides a power line communication system, which is equipped with the above-mentioned power line communication noise suppression device.

[0019] This invention provides a power line communication noise suppression device and a power line communication system. By designing a noise suppression device that integrates a two-level encoding unit based on a Turbo encoder and an RS encoder and an iterative decoding unit based on a soft-output Viterbi algorithm decoder, and applying an orthogonal frequency division multiplexing modulator and a hybrid noise suppression unit, the noise immunity of power line communication is improved, and the performance of the power line communication system is optimized to meet the application requirements of smart grids. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the power line communication noise suppression device in Embodiment 1 of this utility model;

[0022] Figure 2 This is a diagram of the two-level coding unit architecture in Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of the hybrid noise suppression unit architecture in Embodiment 1 of this utility model;

[0024] Figure 4 This is a diagram of the dynamic subcarrier allocation unit architecture in Embodiment 1 of this utility model;

[0025] Figure 5 This is an architecture diagram of the adaptive equalization unit in Embodiment 1 of this utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] In this invention, it should be understood that terms such as “comprising” or “ / having” are intended to indicate the presence of features, figures, steps, actions, components, portions or combinations thereof disclosed in this specification, and are not intended to exclude the possibility of the presence or addition of one or more other features, figures, steps, actions, components, portions or combinations thereof.

[0028] It should also be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] This utility model provides a power line communication noise suppression device, which includes a power line transmitter module and a power line receiver module. The power line transmitter module is disposed at the input end of the power line, and the power line receiver module is disposed at the output end of the power line. The power line transmitter module includes a two-stage coding unit, a multiplexing modulation unit, and a hybrid noise suppression unit. The output end of the two-stage coding unit is connected to the input end of the multiplexing modulation unit, and the output end of the multiplexing modulation unit is connected to the input end of the hybrid noise suppression unit. The two-stage coding unit includes a first-stage encoder and a second-stage encoder. The first-stage encoder is a Turbo encoder, and the second-stage encoder is an RS encoder. The multiplexing modulation unit includes an orthogonal frequency division multiplexing modulator. The power line receiver module includes an iterative decoding unit, which includes a soft-output Viterbi algorithm decoder.

[0031] In one optional implementation of this embodiment, such as Figure 1 As shown, Figure 1 The diagram shows the architecture of a power line communication noise suppression device according to Embodiment 1 of this utility model. The device includes a power line transmitter module and a power line receiver module. The power line transmitter module is located at the input end of the power line, and the power line receiver module is located at the output end of the power line.

[0032] Specifically, the power line communication noise suppression device includes two main modules: a power line transmitter module and a power line receiver module. The power line transmitter module is located at the input end of the power line coupling circuit and is used to process the data before power line communication transmission, while the power line receiver module is used to process the data after power line communication transmission.

[0033] In one optional implementation of this embodiment, such as Figure 1 As shown, the power line transmitter module includes a two-level coding unit, a multiplexing modulation unit, and a hybrid noise suppression unit. The output of the two-level coding unit is connected to the input of the multiplexing modulation unit, and the output of the multiplexing modulation unit is connected to the input of the hybrid noise suppression unit.

[0034] Specifically, the input terminal of the dual-level encoding unit is connected to the input data and encodes the data; the multiplexing modulation unit modulates the encoded data; and the hybrid noise suppression unit suppresses the noise in the modulated data before transmitting it to the power line coupled line for transmission.

[0035] In one optional implementation of this embodiment, such as Figure 2 As shown, Figure 2 The diagram shows the architecture of a two-level encoding unit in Embodiment 1 of this utility model. The two-level encoding unit includes a first-level encoder and a second-level encoder. The first-level encoder is a Turbo encoder, and the second-level encoder is an RS encoder.

[0036] Specifically, the Turbo encoder is a communication encoding device that uses Turbo encoding and consists of two recursive system convolutional code encoders connected in parallel through a random interleaver. In this embodiment, a Turbo encoder with an adaptive application code rate of 1 / 3-3 / 4 is used to generate a highly redundant baseband data stream based on the input data and transmit it to the RS encoder of the second-stage encoder.

[0037] More specifically, the RS encoder is an encoder that uses RS code (Reed Solomon) encoding and is applied to the channel coding technology of forward error correction (FEC). It realizes error detection and correction on the input data through polynomial interpolation and redundancy check. In this embodiment, the high-redundancy baseband data stream output by the Turbo encoder of the first stage encoder is interleaved with a group length of 512 bits to disperse burst errors caused by impulse noise.

[0038] In one optional implementation of this embodiment, such as Figure 1 As shown, the power line receiver module includes an iterative decoding unit, which includes a soft-output Viterbi algorithm decoder.

[0039] Specifically, the soft-output Viterbi algorithm decoder is a decoder that uses the soft-output Viterbi algorithm (SOVA), mainly used for soft-decision decoding of Turbo encoding. In this embodiment, the data transmitted via power line is decoded in 6 iterations to obtain the original data.

[0040] Furthermore, in traditional power line transmission, a single forward error correction (FEC) coding scheme (such as convolutional codes) is typically used. However, in the low signal-to-noise ratio scenario of power line transmission lines, a single coding scheme results in an excessively high bit error rate, exceeding 10%. -5This is insufficient to meet the millisecond-level latency requirements of smart grids. Therefore, in this embodiment, a two-stage encoding unit combining a Turbo encoder and an RS encoder is used, along with a two-stage forward error correction mechanism. A soft-output Viterbi algorithm SOVA decoder is employed for multiple iterative decodings. In scenarios with a signal-to-noise ratio greater than 15dB, the bit error rate can be reduced to 10%. -7 This effectively improves the accuracy of power line communication and optimizes the performance of the power line communication system, enabling it to meet the application requirements of smart grids.

[0041] In an optional implementation of this embodiment, the multiplexing modulation unit includes an orthogonal frequency division multiplexing modulator.

[0042] Specifically, the Orthogonal Frequency Division Multiplexing (OFDM) modulator is a modulator that uses the orthogonal frequency division multiplexing modulation method to perform orthogonal frequency division multiplexing on the data output by the two-level coding unit.

[0043] Furthermore, this method employs an orthogonal frequency division multiplexing modulator, combined with a two-level coding unit based on a two-level forward error correction mechanism, which consumes less coding and modulation resources and reduces communication costs.

[0044] In one optional implementation of this embodiment, such as Figure 3 As shown, Figure 3 The diagram shows the architecture of a hybrid noise suppression unit in Embodiment 1 of this utility model. The hybrid noise suppression unit includes a noise classification unit and a noise processing unit, and the noise classification unit is connected to the noise processing unit.

[0045] Specifically, the noise processing unit includes a background noise processing unit, a narrowband interference noise processing unit, and a pulse noise processing unit.

[0046] Furthermore, the noise classification unit is equipped with a noise recognition model based on a convolutional neural network to distinguish background noise, narrowband interference noise, and impulse noise in the modulated data, and transmits them to the corresponding noise processing unit for processing based on targeted suppression strategies. The narrowband interference noise processing unit uses a frequency-domain adaptive notch filter (notch depth > 40dB) for processing, and the impulse noise processing unit uses a time-domain nonlinear clipping filter (clipping threshold = 3σ) for processing.

[0047] In one optional implementation of this embodiment, such as Figure 1 As shown, the power line transmitter module also includes a dynamic subcarrier allocation unit, which is disposed between the two-level coding unit and the multiplexing modulation unit.

[0048] Specifically, such as Figure 4 As shown, Figure 4 The diagram shows the architecture of a dynamic subcarrier allocation unit according to Embodiment 1 of this utility model. The dynamic subcarrier allocation unit includes a spectrum sensing unit, an adaptive subcarrier allocation unit, and a subcarrier group redundancy unit. The output of the spectrum sensing unit is connected to the input of the adaptive subcarrier allocation unit, and the output of the adaptive subcarrier allocation unit is connected to the input of the subcarrier group redundancy unit.

[0049] In one optional implementation of this embodiment, the spectrum sensing unit is equipped with a spectrum scanner and an FFT Fourier analysis unit to scan the 2MHz-30MHz frequency band in real time and identify the center frequency and bandwidth of narrowband interference in the encoded data through Fourier analysis.

[0050] In one optional implementation of this embodiment, the adaptive subcarrier allocation unit shuts down the interfered subcarriers based on the analysis results of the spectrum sensing unit, dynamically migrates the data therein to high-quality subcarriers, and obtains effective subcarriers by combining orthogonal amplitude modulation (modulation order adaptively switching from BPSK to 64QAM).

[0051] In an optional implementation of this embodiment, the subcarrier group redundancy unit divides the effective subcarrier into multiple subbands and repeatedly transmits the same data block in different subbands to achieve group redundancy.

[0052] Furthermore, this paper considers the presence of time-varying narrowband interference (such as broadcast coupling), impulse noise (such as transient interference from switching equipment), and non-Gaussian noise (background noise) in the power line channel. Existing traditional static subcarrier allocation schemes are difficult to suppress noise in real time. In this embodiment, a hybrid noise suppression unit combined with a dynamic subcarrier allocation unit is used to effectively improve the noise immunity of power line communication.

[0053] In one optional implementation of this embodiment, such as Figure 1 As shown, the power line receiver module further includes an adaptive equalization unit, which is located at the input of the iterative decoding unit.

[0054] Specifically, such as Figure 5 As shown, Figure 5 The diagram shows the architecture of the adaptive equalization unit in Embodiment 1 of this utility model. The adaptive equalization unit includes a subcarrier pilot unit, a minimum mean square error equalizer, and a cyclic prefix dynamic adjustment unit. The output of the subcarrier pilot unit is connected to the input of the minimum mean square error equalizer, and the output of the minimum mean square error equalizer is connected to the input of the cyclic prefix dynamic adjustment unit.

[0055] In an optional implementation of this embodiment, the subcarrier pilot unit performs comb-shaped pilot layout processing on the data transmitted via power line communication (with subcarriers having an interval of ≤8 bits).

[0056] In an optional implementation of this embodiment, the minimum mean square error (MMSE) equalizer compensates for the data processed by the comb pilot layout, thereby compensating for the distortion caused by transmission through the power line channel.

[0057] In an optional implementation of this embodiment, the cyclic prefix dynamic adjustment unit adds a cyclic prefix (CP) code to the data. The length of the CP code must be greater than the maximum multipath delay (typical value 50μs) to eliminate inter-symbol interference in the data.

[0058] In an optional implementation of this embodiment, the power line receiver module further includes a demodulation unit, which is disposed at the input of the adaptive equalization unit.

[0059] Specifically, the demodulation unit includes an orthogonal frequency division multiplexing demodulator.

[0060] In an optional implementation of this embodiment, the power line receiver module further includes a data verification unit, which is disposed at the output of the iterative decoding unit.

[0061] Specifically, the data verification unit includes a Cyclic Redundancy Check (CRC) unit, which is used to verify the data in the erroneous subband.

[0062] In an optional implementation of this embodiment, the power line receiving module further includes a data reconstruction unit, which is disposed at the output of the data verification unit.

[0063] Specifically, the data reconstruction unit is used to reconstruct the original data packet and restore the original data.

[0064] In summary, Embodiment 1 of this utility model provides a power line communication noise suppression device. By designing a noise suppression device that integrates a two-level encoding unit based on a Turbo encoder and an RS encoder and an iterative decoding unit based on a soft-output Viterbi algorithm decoder, and applying an orthogonal frequency division multiplexing modulator and a hybrid noise suppression unit, the device improves the noise immunity of power line communication, optimizes the performance of the power line communication system, and enables it to meet the application requirements of smart grids.

[0065] Example 2

[0066] This utility model provides a power line communication system in embodiment two, which is equipped with the power line communication noise suppression device in embodiment one.

[0067] In summary, Embodiment 2 of this utility model provides a power line communication system equipped with the power line communication noise suppression device of Embodiment 1, which effectively improves the noise immunity of power line communication, optimizes the performance of the power line communication system, and meets the application requirements of smart grids.

[0068] The above provides a detailed description of a power line communication noise suppression device and a power line communication system provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A power line communication noise suppression device, characterized in that, The device includes a power line transmitter module and a power line receiver module. The power line transmitter module is located at the input end of the power line, and the power line receiver module is located at the output end of the power line. The power line transmitter module includes a two-level coding unit, a multiplexing modulation unit, and a hybrid noise suppression unit. The output of the two-level coding unit is connected to the input of the multiplexing modulation unit, and the output of the multiplexing modulation unit is connected to the input of the hybrid noise suppression unit. The dual-level encoding unit includes a first-level encoder and a second-level encoder, wherein the first-level encoder is a Turbo encoder and the second-level encoder is an RS encoder; The multiplexing modulation unit includes an orthogonal frequency division multiplexing modulator; The power line receiver module includes an iterative decoding unit, which includes a soft-output Viterbi algorithm decoder.

2. The power line communication noise suppression device as described in claim 1, characterized in that, The hybrid noise suppression unit includes a noise classification unit and a noise processing unit, with the noise classification unit connected to the noise processing unit.

3. The power line communication noise suppression device as described in claim 1, characterized in that, The power line transmitter module also includes a dynamic subcarrier allocation unit, which is disposed between the two-level coding unit and the multiplexing modulation unit.

4. The power line communication noise suppression device as described in claim 3, characterized in that, The dynamic subcarrier allocation unit includes a spectrum sensing unit, an adaptive subcarrier allocation unit, and a subcarrier group redundancy unit. The output of the spectrum sensing unit is connected to the input of the adaptive subcarrier allocation unit, and the output of the adaptive subcarrier allocation unit is connected to the input of the subcarrier group redundancy unit.

5. The power line communication noise suppression device as described in claim 1, characterized in that, The power line receiver module further includes an adaptive equalization unit, which is located at the input of the iterative decoding unit.

6. The power line communication noise suppression device as described in claim 5, characterized in that, The adaptive equalization unit includes a subcarrier pilot unit, a minimum mean square error equalizer, and a cyclic prefix dynamic adjustment unit. The output of the subcarrier pilot unit is connected to the input of the minimum mean square error equalizer, and the output of the minimum mean square error equalizer is connected to the input of the cyclic prefix dynamic adjustment unit.

7. The power line communication noise suppression device as described in claim 6, characterized in that, The power line receiver module further includes a demodulation unit, which is located at the input of the adaptive equalization unit.

8. The power line communication noise suppression device as described in claim 1, characterized in that, The power line receiver module also includes a data verification unit, which is located at the output of the iterative decoding unit.

9. The power line communication noise suppression device as described in claim 8, characterized in that, The power line receiver module also includes a data reconstruction unit, which is located at the output of the data verification unit.

10. A power line communication system, characterized in that, The power line communication system is equipped with the power line communication noise suppression device according to any one of claims 1-9.

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