發(fā)布時(shí)間：2019-03-05 20:49

【摘要】：電力線通信(Power Line Communication,PLC)是實(shí)現(xiàn)電網(wǎng)智能化的關(guān)鍵技術(shù),而智能電網(wǎng)計(jì)劃是國(guó)家的戰(zhàn)略規(guī)劃之一。電力線分布范圍廣、接入方便,越來越受到智能家居和智能小區(qū)解決方案的青睞。電力線主要是為了傳送電能而建設(shè)的,在進(jìn)行通信時(shí)面臨信道噪聲和干擾強(qiáng)、信號(hào)衰減大、阻抗變化不匹配等問題。MIMO技術(shù)能在不增加信號(hào)帶寬的情況下,增大通信系統(tǒng)的傳輸速率,并且能夠有效增強(qiáng)系統(tǒng)的抗干擾能力,因此MIMO技術(shù)在電力線通信系統(tǒng)中的使用和研究,是現(xiàn)在低壓寬帶電力線通信研究的重要方向之一。研究MIMO系統(tǒng)空時(shí)編碼技術(shù),選擇適應(yīng)電力線信道特點(diǎn)的空時(shí)編碼技術(shù)有利于電力線通信系統(tǒng)高效穩(wěn)定運(yùn)行。首先介紹了PLC信道條件,MIMO分集和復(fù)用技術(shù),給出電力線MIMO系統(tǒng)模型和系統(tǒng)容量。然后分析了空時(shí)編碼的設(shè)計(jì)準(zhǔn)則,空時(shí)格碼,空時(shí)分組碼,差分空時(shí)分組碼的編譯碼方法,并對(duì)其性能進(jìn)行了仿真分析,結(jié)果表明空時(shí)格碼譯碼復(fù)雜度隨著傳輸速率呈指數(shù)增加實(shí)現(xiàn)困難,空時(shí)分組碼分集增加能明顯降低系統(tǒng)誤碼率,差分空時(shí)分組編碼同空時(shí)分組碼相比,雖然不用信道估計(jì)實(shí)現(xiàn)譯碼但犧牲了系統(tǒng)信噪比,并不適用于信道環(huán)境多變的PLC網(wǎng)絡(luò)。論文研究了一種新的正交空時(shí)頻編碼方案,并結(jié)合電力線信道的混合噪聲模型,多徑衰減信道模型給出了誤碼性能,結(jié)果表明該編碼方案具有較好的抗干擾能力及較低的噪聲敏感度,并且可以獲得更大的信噪比增益,在此基礎(chǔ)上提出了一種PLC通信系統(tǒng)的空時(shí)頻編碼技術(shù)方案。在構(gòu)建的混合噪聲和多徑信道條件下的MIMO-PLC-OFDM通信系統(tǒng)下對(duì)空時(shí)編碼、空頻編碼、空時(shí)頻編碼的誤碼性能進(jìn)行了仿真比較,結(jié)果表明在電力線這種信道環(huán)境下,空時(shí)頻碼相比另外兩種編碼具有更低的誤碼率,盡管編碼速率有所損失,但是在PLC中性能最好,具有更好的適用性。
[Abstract]:Power line communication (Power Line Communication,PLC) is the key technology to realize the intelligent power grid, and the smart grid plan is one of the national strategic plans. Power line is widely distributed, easy to access, more and more popular smart home and smart community solutions. Power lines are mainly built to transmit electric energy and face strong channel noise and interference, large signal attenuation, impedance mismatch and so on. MIMO technology can not increase the bandwidth of the signal without increasing the bandwidth of the signal. The transmission rate of the communication system is increased and the anti-jamming ability of the system is enhanced effectively. Therefore, the application and research of MIMO technology in the power line communication system is one of the important directions in the research of low-voltage broadband power line communication. The space-time coding technology of MIMO system is studied, and the selection of space-time coding technology adapted to the characteristics of power line channel is beneficial to the efficient and stable operation of power line communication system. Firstly, the PLC channel condition, MIMO diversity and multiplexing technology are introduced, and the power line MIMO system model and system capacity are given. Then the design criteria of space-time codes, space-time trellis codes, space-time block codes and differential space-time block codes are analyzed, and their performance is simulated. The results show that the decoding complexity of space-time trellis codes increases exponentially with the transmission rate. The increase of diversity of space-time block codes can significantly reduce the bit error rate of the system, and the differential space-time block codes are compared with space-time block codes. Although decoding without channel estimation at the expense of the signal-to-noise ratio (SNR) of the system, it is not suitable for PLC networks with variable channel environment. In this paper, a new orthogonal space-time-frequency coding scheme is studied, and combined with the mixed noise model of power line channel, the error performance of multipath attenuation channel model is given. The results show that the coding scheme has better anti-jamming ability and lower noise sensitivity, and can obtain larger signal-to-noise ratio gain. On the basis of this, a space-time-frequency coding scheme for PLC communication system is proposed. The performance of space-time coding, space-frequency coding and space-time-frequency coding is simulated and compared under the condition of mixed noise and multipath channel in MIMO-PLC-OFDM communication system. The results show that in the channel environment of power line, the error performance of space-time coding, space-frequency coding and space-time-frequency coding is compared. Compared with the other two codes, space-time-frequency codes have lower bit error rate (BER). Despite the loss of coding rate, space-time-frequency codes have the best performance and better applicability in PLC.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN919.3

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