Digital signal processor (DSP)-based medium-voltage power line carrier communication system

Abstract

The invention discloses a DSP-based medium-voltage power line carrier communication system, which comprises a DSP core control unit, an OFDM modulation-demodulation module, an LSTM channel noise model unit and a signal transmission interface, and is characterized in that each functional unit realizes cooperative linkage through a high-speed hardware bus and a standardized software protocol, realizes subcarrier dynamic distribution through OFDM, and predicts and suppresses noise in real time through LSTM. And the DSP overall module is coordinated. The system can be adapted to a 0.5-2.0 km medium-voltage power line, the transmission rate can be up to 50 Mbits-1, the noise prediction MAPE is only 10.62%, and the system is mainly used for scenes such as intelligent power grid remote monitoring and power data acquisition. According to the invention, the transmission efficiency and the anti-interference capability are greatly improved, the construction cost is reduced by 60%, the operation and maintenance cost is reduced by 30%, the deployment is flexible, and reliable support is provided for intelligent power grid digitization.

Description

Technical Field

[0001] This invention relates to the field of power communication technology, and in particular to a medium-voltage power line carrier communication system based on DSP. Background Technology

[0002] Medium-voltage power line carrier communication is a core supporting technology for the digitalization of smart grids. With the advantage of reusing existing power line transmission media, it is widely used in scenarios such as remote monitoring and data acquisition, which can significantly reduce the construction cost of communication infrastructure.

[0003] However, medium-voltage power line channels suffer from problems such as frequency-selective fading, multipath interference, and dynamic noise, leading to three major bottlenecks in existing technologies: First, low transmission efficiency, with traditional solutions achieving a maximum rate of less than 36 Mbit / s. -1 First, it is difficult to meet the demand for massive real-time data transmission; second, it has weak anti-interference ability, with noise prediction error exceeding 18% and a persistently high bit error rate; third, it has poor channel adaptability, with a communication interruption rate exceeding 0.1%, and cannot be compatible with different types of power lines within a range of 0.5-2.0km.

[0004] While existing technologies have incorporated Orthogonal Frequency Division Multiplexing (OFDM) modulation and Digital Signal Processor (DSP) control units, they have failed to achieve deep synergy between hardware, modulation techniques, and noise suppression algorithms, lacking a dynamic adaptation mechanism. Long Short-Term Memory (LSTM) neural network models possess unique advantages in time-series signal prediction. Integrating LSTM with DSP and OFDM technologies to construct a closed-loop collaborative system represents a key path to overcoming these technological bottlenecks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a DSP-based medium-voltage power line carrier communication system that can achieve accurate prediction and suppression of dynamic noise, adaptive allocation of subcarriers and adaptation to multiple types of medium-voltage power line channels, significantly improving transmission rate, anti-interference capability and communication reliability, thereby overcoming the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A DSP-based medium-voltage power line carrier communication system includes a DSP core control unit, an OFDM modulation and demodulation module, an LSTM channel noise model unit, and a signal transmission interface. Each functional unit achieves coordinated operation through a high-speed hardware bus and standardized software protocols. Its key feature is: The DSP core control unit chip is used to coordinate signal acquisition and preprocessing, noise compensation signal generation, OFDM modulation mode switching, and collaborative control of various modules. The OFDM modulation and demodulation module includes an A / D converter and a D / A converter, is configured with 1024 subcarriers and 128 cyclic prefixes, supports adaptive switching between 64QAM and 16QAM modulation modes, and completes signal modulation and demodulation through IFFT / FFT to achieve dynamic subcarrier allocation. The LSTM channel noise model unit deploys an LSTM model to extract medium-voltage power line channel noise features and predict noise data in real time, and outputs the noise prediction results to the DSP core control unit. The power line signal transmission interface is compatible with JKLYJ-240mm. 2 Type of overhead power line or YJV22-3×240mm 2 Type of power cable, supporting medium-voltage power line signal transmission over a distance of 0.5-2.0km; The system workflow is as follows: Signal acquisition: The medium-voltage power line signal is converted into a digital signal by an AD9288 A / D converter. The DSP core control unit preprocesses the digital signal to separate noise components. Noise suppression: The LSTM channel noise model unit extracts the separated noise features and makes real-time predictions. The DSP core control unit generates compensation signals based on the prediction results to cancel out channel noise interference. OFDM transmission: The DSP core control unit controls the OFDM modulation and demodulation module to switch the modulation mode according to the noise prediction result. After the signal is modulated by IFFT processing, it is sent through the signal transmission interface. The receiving end completes the signal demodulation by FFT processing and equalization correction. Indicator monitoring: Real-time monitoring of key indicators such as transmission rate and bit error rate using spectrum analyzers and oscilloscopes.

[0007] The DSP core control unit establishes real-time data interaction with the OFDM modulation and demodulation module and the LSTM channel noise model unit through a hardware bus, with a data transmission delay of ≤1ms.

[0008] The LSTM channel noise model unit predicts the channel notch point and outputs the notch point location information to the DSP core control unit. The DSP core control unit then drives the OFDM modulation and demodulation module to adjust the transmission parameters of the corresponding subcarrier.

[0009] The DSP core control unit uses a TITMS320C6748 DSP chip.

[0010] The A / D converter is model AD9288 and the D / A converter is model AD9708.

[0011] The above technical solution has the following beneficial effects: This invention deeply integrates the TITMS320C6748 DSP core control unit, the OFDM modulation and demodulation module integrating AD9288 A / D and AD9708 D / A converters, and the LSTM channel noise modeling unit to construct a closed-loop collaborative mechanism of "noise prediction-subcarrier adaptation-signal processing." This not only achieves wide compatibility with 0.5-2.0km overhead / cable medium-voltage power lines, but also enables the system to achieve a peak transmission rate of 50 Mbit / s at a signal-to-noise ratio of 45dB. -1 The transmission rate is no less than 30 Mbit / s when the signal-to-noise ratio is 20 dB. -1 It significantly improves transmission efficiency compared to traditional technologies; Meanwhile, thanks to the accurate noise prediction by the LSTM model and the adaptive switching of OFDM modulation driven by DSP, the system bit error rate is controlled within 10%. -6 Within this range, the communication interruption rate is reduced to 0.05%, significantly enhancing anti-interference capabilities and communication reliability; Furthermore, the system relies on existing power lines without the need for additional communication lines, which can reduce the construction cost of a single project by more than 60% and the operation and maintenance cost by 30%. It is also flexible in deployment and easy to operate and maintain, effectively supporting remote monitoring of smart grids and real-time collection of power data, improving the stability of grid operation, and providing an efficient and reliable communication solution for the digital upgrade of the power system. Attached Figure Description

[0012] To more clearly illustrate the embodiments of the present invention or the technical solutions in 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 merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0013] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0014] Figure 1 This is a system architecture diagram of the medium-voltage power line carrier communication technology of the present invention; Figure 2 This is a schematic diagram of the OFDM module DSP hardware principle of the present invention; Figure 3 This is a schematic diagram of the OFDM module of the present invention; Figure 4 This is a hardware design diagram of the LSTM channel noise model of the present invention; Figure 5 This is a flowchart of the LSTM model of the present invention. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0016] See Figures 1-5 As shown, this invention discloses a DSP-based medium-voltage power line carrier communication system, including a DSP core control unit, an OFDM modulation and demodulation module, an LSTM channel noise model unit, and a signal transmission interface. Each functional unit achieves coordinated operation through a high-speed hardware bus and a standardized software protocol. Its key feature is: The DSP core control unit uses a TITMS320C6748 DSP chip to coordinate signal acquisition and preprocessing, noise compensation signal generation, OFDM modulation mode switching, and collaborative control of various modules. The OFDM modulation and demodulation module includes an AD9288 A / D converter and an AD9708 D / A converter, configured with 1024 subcarriers and 128 cyclic prefixes, supports adaptive switching between 64QAM and 16QAM modulation modes, and completes signal modulation and demodulation through IFFT / FFT to achieve dynamic subcarrier allocation; The LSTM channel noise model unit deploys an LSTM model to extract medium-voltage power line channel noise features and predict noise data in real time, and outputs the noise prediction results to the DSP core control unit. The power line signal transmission interface is compatible with JKLYJ-240mm. 2 Type of overhead power line or YJV22-3×240mm 2 Type of power cable, supporting medium-voltage power line signal transmission over a distance of 0.5-2.0km; The system workflow is as follows: (1) Signal acquisition: The medium-voltage power line signal is converted into a digital signal by the AD9288 A / D converter. The DSP core control unit preprocesses the digital signal to separate noise components. (2) Noise suppression: The LSTM channel noise model unit extracts the separated noise features and makes real-time predictions. The DSP core control unit generates compensation signals based on the prediction results to cancel out channel noise interference. (3) OFDM transmission: The DSP core control unit controls the OFDM modulation and demodulation module to switch the modulation mode according to the noise prediction result. After the signal is modulated by IFFT, it is sent through the signal transmission interface. The receiving end completes the signal demodulation by FFT processing and equalization correction. (4) Indicator monitoring: Real-time monitoring of key indicators such as transmission rate and bit error rate using spectrum analyzer and oscilloscope.

[0017] The system has a transmission rate of no less than 50 Mbit / s at a signal-to-noise ratio of 45 dB. -1 The transmission rate at a signal-to-noise ratio of 20dB is no less than 30Mbit / s. -1 .

[0018] The noise prediction accuracy of the LSTM channel noise model unit meets the requirements of mean absolute percentage error (MAPE) ≤ 10.62% and root mean square error (RMSE) ≤ 7.20%.

[0019] The system has a bit error rate of ≤10⁻⁶ and a communication interruption rate of ≤0.05%.

[0020] The LSTM channel noise model unit predicts the channel notch point and outputs the notch point location information to the DSP core control unit. The DSP core control unit then drives the OFDM modulation and demodulation module to adjust the transmission parameters of the corresponding subcarrier, thereby improving the adaptability to complex channels.

[0021] The DSP core control unit establishes real-time data interaction with the OFDM modulation and demodulation module and the LSTM channel noise model unit through a hardware bus, with a data transmission delay of ≤1ms.

[0022] The working process of this invention: First, the signal acquisition and preprocessing stage begins. The mixed signal in the medium-voltage power line channel is converted from analog to digital signal by the AD9288 A / D converter of the OFDM modulation and demodulation module. The DSP core control unit starts the time-domain filtering and spectrum separation algorithm to process the converted digital signal and achieve accurate separation of effective communication signal and channel noise components. The noise prediction and compensation stage then begins. The LSTM channel noise modeling unit extracts the temporal and frequency domain features of the separated noise components and performs real-time noise prediction using a pre-trained LSTM model. The output noise prediction results have a mean absolute percentage error (MAPE) ≤ 10.62% and a root mean square error (RMSE) ≤ 7.20%. The DSP core control unit generates the corresponding noise compensation signal based on the prediction results using an adaptive filtering algorithm to specifically cancel and suppress channel noise. Next, the OFDM modulation, transmission, and demodulation stage begins. The DSP core control unit dynamically determines the channel quality based on the noise prediction accuracy and drives the OFDM modulation and demodulation module to adaptively switch between 64QAM and 16QAM modulation modes. The modulated signal is processed by IFFT and then sent to the target end through the power line signal transmission interface. The receiving end completes signal demodulation and distortion compensation through FFT transformation and equalization correction algorithm. At the same time, the LSTM channel noise modeling unit will predict the channel notch point through noise feature analysis and output the notch point position coordinate information to the DSP core control unit. The DSP drives the OFDM module to adjust the power allocation and modulation parameters of the corresponding subcarrier, further improving the transmission stability under complex channels. Finally, in the real-time performance monitoring phase, key performance indicators such as the system's transmission rate and bit error rate are monitored and adjusted in real time using a spectrum analyzer and digital storage oscilloscope. This ensures that the system achieves a peak transmission rate of ≥50 Mbit / s with a signal-to-noise ratio of 45 dB in a 0.5-2.0 km medium-voltage power line channel environment. -1 A transmission rate ≥ 30 Mbit / s at a signal-to-noise ratio of 20 dB -1 And the bit error rate is ≤10 -6 Stable operation with a communication interruption rate of ≤0.05%.

[0023] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A DSP-based medium-voltage power line carrier communication system, comprising a DSP core control unit, an OFDM modulation and demodulation module, an LSTM channel noise model unit, and a signal transmission interface, wherein each functional unit achieves coordinated operation through a high-speed hardware bus and a standardized software protocol, characterized in that: The DSP core control unit chip is used to coordinate signal acquisition and preprocessing, noise compensation signal generation, OFDM modulation mode switching, and collaborative control of various modules. The OFDM modulation and demodulation module includes an A / D converter and a D / A converter, is configured with 1024 subcarriers and 128 cyclic prefixes, supports adaptive switching between 64QAM and 16QAM modulation modes, and completes signal modulation and demodulation through IFFT / FFT to achieve dynamic subcarrier allocation. The LSTM channel noise model unit deploys an LSTM model to extract medium-voltage power line channel noise features and predict noise data in real time, and outputs the noise prediction results to the DSP core control unit. The power line signal transmission interface is compatible with JKLYJ-240mm. 2 Type of overhead power line or YJV22-3×240mm 2 Type of power cable, supporting medium-voltage power line signal transmission over a distance of 0.5-2.0km; The system workflow is as follows: 1) Signal acquisition: The medium-voltage power line signal is converted into a digital signal by the AD9288 A / D converter. The DSP core control unit preprocesses the digital signal to separate noise components. 2) Noise suppression: The LSTM channel noise model unit extracts the separated noise features and performs real-time prediction. The DSP core control unit generates a compensation signal based on the prediction results to cancel out channel noise interference. 3) OFDM transmission: The DSP core control unit controls the OFDM modulation and demodulation module to switch the modulation mode according to the noise prediction results. After the signal is modulated by IFFT processing, it is sent through the signal transmission interface. The receiving end completes the signal demodulation by FFT processing and equalization correction. 4) Indicator monitoring: Real-time monitoring of key indicators such as transmission rate and bit error rate using spectrum analyzer and oscilloscope.

2. The DSP-based medium voltage power line carrier communication system of claim 1, wherein: The DSP core control unit establishes real-time data interaction with the OFDM modulation and demodulation module and the LSTM channel noise model unit through a hardware bus, with a data transmission delay of ≤1ms.

3. The DSP-based medium voltage power line carrier communication system of claim 2, wherein: The LSTM channel noise model unit predicts the channel notch point and outputs the notch point location information to the DSP core control unit. The DSP core control unit then drives the OFDM modulation and demodulation module to adjust the transmission parameters of the corresponding subcarrier.

4. The DSP-based medium voltage power line carrier communication system of claim 3, wherein: The DSP core control unit uses a TITMS320C6748 DSP chip.

5. The DSP-based medium voltage power line carrier communication system of claim 4, wherein: The A / D converter is model AD9288 and the D / A converter is model AD9708.

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