蘇炫榮臺灣大學：電信工程學研究所劉炫佃Liu, Hsuan-TienHsuan-TienLiu2007-11-272018-07-052007-11-272018-07-052005http://ntur.lib.ntu.edu.tw//handle/246246/58978髒紙通道(Dirty paper channel)是指在一個通道中，除了AWGN的影響，傳送訊號還會遭受到一個干擾訊號影響，而這干擾在傳送端是已知的，也因此在理論上證明了它最大可傳送容量與AWGN通道是相同的。在本篇論文中我們分析髒紙編碼(Dirty paper coding)的傳輸技術，從最簡單的Tomlinson-Harashima前置編碼，到多維的前置編碼，如格子前置編碼(Trellis precoding)跟巢狀晶格前置編碼(Nested lattices precoding)。 接著我們考慮在無線通道環境裡應用髒紙編碼，而藉由使用QR分解(QR decomposition)，我們可以應用之前所提的傳輸架構，解決在無線通道中傳送訊號超過放大器線性範圍所造成的失真問題，並將此系統與正交分頻多工(OFDM)系統做比較，而我們發現在低資料速率時，正交分頻多工系統的表現較佳，相反地，當提高資料速率時，使用髒紙編碼傳輸的系統較佳。The dirty paper channel is a channel model with known interference at the transmitter. It has been proven that the channel model can achieve the clean capacity. In the thesis we study the dirty paper coding (DPC) schemes. A straightforward coding scheme is Tomlinson-Harashima precoding (TH precoding). Though it is a simple scheme, it suffers modulo, power, and shaping losses. In order to rocover the losses, high-dimensional precoding schemes including advanced trellis precoding (ATP) and nested lattices precoding are developed. For wireless channels, the use of QR decomposition makes each subchannel become a dirty paper channel. Therefore, dirty paper coding schemes can be applied in order to avoid clipping. Comparing QR modulation using DPC and orthogonal frequency division multiplexing (OFDM), the performance of OFDM is better than QR modulation using DPC at low data rate. On the contrary, QR modulation using DPC is better at high data rate.CHAPTER 1. PREFACE 1 1.1. INTRODUCTION 1 1.2. THESIS OUTLINE 2 CHAPTER 2. BACKGROUND 3 2.1. DIRTY PAPER CHANNEL MODEL 3 2.2. WRITING ON DIRTY PAPER 4 2.3. LATTICE PRECODING 6 CHAPTER 3. TRANSMISSION SCHEMES 10 3.1. ONE-DIMENSIONAL PRECODING 10 3.1.1. TOMLINSON-HARASHIMA PRECODING 10 3.1.2. PRECODING LOSSES 12 3.1.3. ADVANCED TOMLINSON-HARASHIMA PRECODING 14 3.2. HIGH-DIMENSIONAL PRECODING 15 3.2.1. TRELLIS SHAPING 16 3.2.2. ADVANCED TRELLIS PRECODING 22 3.2.3. NESTED LATTICES PRECODING 31 CHAPTER 4. APPLICATION 35 4.1. WIRELESS CHANNELS 36 4.1.1. THE NARROWBAND FADING CHANNEL 36 4.1.1.1. THE RAYLEIGH FADING CHANNEL 36 4.1.1.2. THE RICIAN FADING CHANNEL 38 4.1.2. THE WIDEBAND FADING CHANNEL 38 4.2. SYSTEM MODEL 40 4.3. ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING 41 4.4. QR MODULATION 43 4.5. BIT LOADING 47 4.6. SIMULATION RESULTS 50 CHAPTER 5. CONCLUSIONS 581317469 bytesapplication/pdfen-US髒紙編碼Dirty paper codinglattice precodingTomlinson-Harashima precodingtrellis shapingtrellis precodingnested lattices precodingmulticarrier modulationdiscrete multitoneorthogonal frequency division multiplexingQR decompositionthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/58978/1/ntu-94-R92942098-1.pdf