LPLC通信中HARQ與組合譯碼方法的研究與實現(xiàn)
[Abstract]:With the rapid development of power line carrier communication technology, it has become a hot research topic in the field of science and technology. However, the characteristics of power line channel are large signal interference, complex noise types, strong signal attenuation, and its frequency selective fading characteristics and strong time variability, which seriously affect the reliable communication of data. Error control technology is one of the key technologies to establish reliable low voltage power line carrier communication system. Therefore, this paper mainly studies the error control technology suitable for PLC system. In this paper, after analyzing and comparing the related modulation / demodulation technology, an improved 2FSK demodulation algorithm based on DSTFT is proposed, and the conventional DFT algorithm and the improved DFT algorithm are simulated and compared by MATLAB to verify the effectiveness of the improved algorithm. This improved algorithm can improve the real-time performance of the system on the premise of simplifying the hardware structure of the system. According to the influence of noise on low voltage PLC system, the existing error control technologies are analyzed theoretically and simulated by MATLAB, including CRC error detection code, error correction code, HARQ and combined decoding technology. The power line communication system is modeled and simulated by MATLAB, and the power line carrier system with higher reliability is designed by studying the different combinations of error correction code module, combined decoding module and its ARQ module. These key technologies have low implementation complexity and good anti-interference performance in PLC applications where delay requirements are not strict, carrier frequency is not high and data transmission rate is low. Using TI high performance 32-bit fixed-point DSP chip TMS320F2812 as the core control platform, the core algorithm of the main modules of PLC error control system is programmed, including error correction code, HARQ, combination decoding and CRC error detection code, as well as serial port transceiver module, modulation and demodulation module. Each sub-module is a separate API function to facilitate the call of the main program of the system. The corresponding peripheral circuits, including transmitting power amplifier, coupling, resonance filtering and receiving signal amplification circuit, are designed. The whole system has the characteristics of simple structure, flexibility and so on. These key technologies have low complexity and good anti-interference performance when used in low-voltage power line communication. In practical application, according to different application requirements and hardware and software resource allocation, an error control scheme suitable for low voltage PLC can be designed to meet the requirements of low cost, easy to implement and high reliable communication. A low voltage PLC experimental system is built and tested and analyzed. The experimental data show that the designed error control scheme can effectively resist random errors and burst errors caused by channel noise and improve the anti-interference ability of carrier communication system. The error control technology suitable for PLC provides an alternative for improving the reliability of power line carrier communication.
【學(xué)位授予單位】:福州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN913.6
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