林茂昭臺灣大學：電信工程學研究所鄭光宏Cheng, Kwang-HongKwang-HongCheng2007-11-272018-07-052007-11-272018-07-052007http://ntur.lib.ntu.edu.tw//handle/246246/58741電力線通訊是指利用電力線來傳輸資料的一種通訊方式。由於具有高便利性和低成本兩大特徵，電力線通訊被認為能夠有效地處理當前最後一哩(Last Mile)接取的問題。然而，由於電力線並不是一種理想的通訊媒介，電力線通訊在傳輸時會受到相當強烈的干擾。 我們設計了一種可應用於電力線傳輸的多重近接架構。和當今流行的Home-Plug 1.0、HomePlug AV等商業規格不同的是，這種架構採用交織多址(IDMA)和正交分頻多工(OFDM)的組合作為系統主幹。除此之外，我們也使用了位元承載(Bit-Loading)技術，以期增進系統整體的傳輸效率。Power-Line Communication(PLC) uses existing electric lines to transmit broadband signals in residential networking environments. Being inexpensive and convenient, PLC is a potential solution to the last-mile access problem. However, the transmission environment in PLC is quite hostile since power-lines are not initially designed for data transmission. Our work deals with a multiple-access system for PLC applications. Unlike the specifications defned in HomePlug 1.0 and HomePlug AV, the proposed system consists of the interleave-division multiple access(IDMA) scheme and the well-known OFDM transceiver. To enhance the system performance, we need to use bit-loading to match the PLC channel which consists of subchannels with great variety. We also develop a bit-loading scheme which can significantly improve the system performance since conventional bit-loading algorithms are not appropriate for IDMA-OFDM systems.1 Introduction 1 2 Basics of Power-Line Communication 3 2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Progress of Commercial Standards . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Modeling : Channel and Noise in PLC . . . . . . . . . . . . . . . . . . . . 6 3 IDMA and Superposition Codes 9 3.1 Interleave-Division Multiple Access . . . . . . . . . . . . . . . . . . . . . . 9 3.1.1 IDMA : Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1.2 IDMA : Transmitter and Receiver . . . . . . . . . . . . . . . . . . 11 3.1.3 IDMA : Performance . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1.4 IDMA for Multipath channels . . . . . . . . . . . . . . . . . . . . . 14 3.2 Superposition Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4 System Under Consideration 19 4.1 IDMA-OFDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.2 Bit-Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.2.1 Conventional Bit-Loading Algorithms . . . . . . . . . . . . . . . . . 23 4.2.2 Proposed Bit-Loading Algorithm . . . . . . . . . . . . . . . . . . . 25 4.2.3 Bit-Loading in Multi-User Environments . . . . . . . . . . . . . . . 28 5 Conclusion 33 Bibliography 34en-US電力線通訊交織多址正交分頻多工位元承載Powerline communicationIDMAOFDMBit-loadingthesis