Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/6727
標題: 窄頻電力線通訊之展頻數據機設計與實現
Design and Implementation of Spread Spectrum Scheme Based Modems for Narrowband Power Line Communication
作者: 陳信文
Chen, Shin-Wen
關鍵字: MMFSK;跳頻展頻;FHSS;Narrowband PLC;DSSS;MBOK;FSK;transition counting technique;窄頻電力線通訊;直接序列展頻;M路雙正交調變;頻率鍵移;轉態計數技術
出版社: 電機工程學系所
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摘要: 
使用電力線作為通訊媒介在許多應用上,提供一個便利又低成本的解決之道,因為電力網存取方便且覆蓋率為全球最廣闊。在本論文中,我們針對「智慧型室內電力監控系統」,設計出兩個低複雜度的電力線展頻通訊數據機,其架構分別是直接序列展頻加改良型FSK(Frequency Shift Keying)之展頻數據機與改良型MMFSK(M-levelled M-ary Frequency-shift keying)加改良型直接序列之展頻數據機,兩者各有其優缺點,兩者之直接序列展頻中皆使用修正型沃爾什碼(Modified Walsh Code)來做時間上展頻的動作,而MMFSK中則是使用均勻分布的跳頻碼(Uniformly Distributed Hopping Code, UDHC)來進行時間上與頻率上的展頻。而在改良型FSK的部分則是提高取樣頻率做權重的判斷加強訊號的正確性後,再計算其轉態點數目,藉此判斷其訊號頻率,兩個展頻數據機皆採用無需昂貴的數位類比轉換器(DAC)與類比數位轉換器(ADC)的設計,使硬體成本能較為低廉,並且提供了足夠強健的通訊協定與主僕式網路架構。

在400K Hz的頻寬內,直接序列展頻加改良型FSK之展頻數據機可以達到100Kbps的資料傳送率,而改良型MMFSK加改良型直接序列之展頻數據機可以達到200Kbps的資料傳送率,後者雖然資料傳送率較高,且其抗雜訊能力較強,但其硬體的邏輯閘數為5.6K,而前者僅需2.9K,後者約為前者的兩倍。

最後我們將演算法之硬體架構實現,並在Xilinx FPGA (Field Programmable Gate Array)開發板上將其加入智慧型室內電力監控系統當中,且進行晶片實做並下線的動作,我們設計的智慧型室內電力監控系統可從伺服器端,透過電力線通訊監控各個節點之電器資訊。

Due to the readiness and extensive coverage of power networks, using power-lines as communication media provides a convenient and cost-effective solution for data transmission in many applications. In this thesis, two low complexity power-line modem designs targeting intelligent indoor power monitor and control system are presented. The structures are the direct sequence spread spectrum(DSSS) plus the modified Frequency Shift Keying(FSK) and the improved M-levelled M-ary Frequency shift keying(MMFSK) plus improved direct sequence spread spectrum. Both designs adopt the Modified Walsh Code for direct sequence spread spectrum. The MMFSK scheme adopts Uniformly Distributed Hopping Code and accomplishes spreading in both time and frequency domains. The modified FSK scheme increases the sampling frequency to enhance the signal detection. It calculates the number of transitions points to determine the signal frequency. Two spread spectrum modems do not require expensive DAC or ADC design, so the hardware cost can be relatively cheap. Both designs adopt master-slave-type network architecture and protocols.

At 400K Hz bandwidth, the data rate of the direct sequence spread spectrum plus the modified Frequency Shift Keying is 100Kbps and the data rate of the improved M-levelled M-ary Frequency-shift keying plus improved direct sequence spread spectrum is 200Kbps. Although the data rate of the latter design is twice as large as the former one, its hardware gate count, 5.6K, is almost the double of the previous design (2.9K).

Finally, the entire intelligent power monitoring system is implemented in a Xilinx FPGA (Field Programmable Gate Array) development board. ASICs are also developed. The prototype of an intelligent indoor power monitoring system, which can monitor all node of the electrical information through the power line communications, is also accomplished.
URI: http://hdl.handle.net/11455/6727
其他識別: U0005-1808201120094400
Appears in Collections:電機工程學系所

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