List of Figures |
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xi | |
List of Tables |
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xxv | |
List of Abbreviations |
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xxvii | |
Preface |
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xxxiii | |
About the Authors |
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xxxvii | |
Chapter 1 Introduction: Optical Wireless Communication Systems |
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1 | (38) |
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1.1 Wireless Access Schemes |
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4 | (6) |
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1.2 A Brief History of OWC |
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10 | (3) |
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13 | (1) |
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14 | (9) |
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1.5 OWC Application Areas |
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23 | (2) |
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1.6 Safety and Regulations |
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25 | (3) |
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1.6.1 Maximum Permissible Exposures (MPE) |
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28 | (1) |
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28 | (4) |
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32 | (7) |
Chapter 2 Optical Sources and Detectors |
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39 | (42) |
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39 | (3) |
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2.2 The Light-Emitting Diode |
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42 | (11) |
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45 | (1) |
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2.2.2 Planar and Dome LEDs |
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45 | (1) |
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46 | (2) |
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48 | (4) |
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2.2.4.1 Internal Quantum Efficiency |
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48 | (1) |
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2.2.4.2 External Quantum Efficiency |
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48 | (1) |
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49 | (1) |
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2.2.4.4 Luminous Efficiency |
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49 | (1) |
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2.2.4.5 LED Modulation Bandwidth |
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50 | (2) |
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52 | (1) |
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53 | (1) |
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53 | (10) |
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2.3.1 Operating Principle of a Laser |
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53 | (1) |
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2.3.2 Population Inversion |
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54 | (1) |
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2.3.3 Optical Feedback and Laser Oscillation |
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55 | (1) |
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2.3.4 Properties and Specifications of a Laser |
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56 | (1) |
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2.3.5 Basic Semiconductor Laser Structure |
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57 | (1) |
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2.3.6 The Structure of Common Laser Types |
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58 | (4) |
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2.3.6.1 Fabry-Perot Laser |
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58 | (1) |
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2.3.6.2 Distributed Feedback (DFB) Laser |
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59 | (1) |
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2.3.6.3 Vertical Cavity Surface Emitting Laser (VCSEL) |
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60 | (1) |
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2.3.6.4 Superluminescent Diodes (SLDs) |
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61 | (1) |
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2.3.7 Comparison of LED and Laser Diodes |
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62 | (1) |
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63 | (4) |
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65 | (2) |
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67 | (1) |
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2.5 Photodetection Techniques |
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67 | (5) |
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68 | (1) |
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68 | (4) |
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2.5.2.1 Heterodyne Detection |
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70 | (1) |
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2.5.2.2 Homodyne Detection |
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71 | (1) |
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72 | (4) |
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72 | (1) |
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2.6.2 Dark-Current Shot Noise and Excess Noise |
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73 | (1) |
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2.6.3 Background Radiation |
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74 | (1) |
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75 | (1) |
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2.6.5 Relative Intensity Noise (RIN) |
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75 | (1) |
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2.6.6 Signal-to-Noise Ratio (SNR) |
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76 | (1) |
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2.7 Optical Detection Statistics |
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76 | (2) |
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78 | (3) |
Chapter 3 Channel Modelling |
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81 | (76) |
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3.1 Indoor Optical Wireless Communication Channels |
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81 | (15) |
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3.1.1 LOS Propagation Model |
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84 | (3) |
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3.1.2 Non-LOS Propagation Model |
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87 | (7) |
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3.1.3 Ceiling Bounce Model |
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94 | (1) |
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95 | (1) |
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96 | (1) |
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3.2 Artificial Light Interference |
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96 | (8) |
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99 | (1) |
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3.2.2 Fluorescent Lamp Driven by Conventional Ballast |
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99 | (1) |
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3.2.3 Fluorescent Lamp Model |
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100 | (4) |
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104 | (47) |
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3.3.1 Atmospheric Channel Loss |
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104 | (3) |
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107 | (8) |
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115 | (4) |
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3.3.4 Optical and Window Loss |
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119 | (1) |
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119 | (2) |
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3.3.6 The Atmospheric Turbulence Models |
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121 | (14) |
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3.3.6.1 Log-Normal Turbulence Model |
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125 | (4) |
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3.3.6.2 Spatial Coherence in Weak Turbulence |
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129 | (2) |
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3.3.6.3 Limit of Log-Normal Turbulence Model |
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131 | (1) |
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3.3.6.4 The Gamma-Gamma Turbulence Model |
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131 | (4) |
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3.3.6.5 The Negative Exponential Turbulence Model |
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135 | (1) |
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3.3.7 Atmospheric Effects on OWC Test Bed |
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135 | (27) |
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3.3.7.1 Calibration of the Test Bed to the Real Outdoor Environment |
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139 | (6) |
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3.3.7.2 Demonstration of Scintillation Effect on Data Carrying Optical Radiation |
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145 | (6) |
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151 | (6) |
Chapter 4 Modulation Techniques |
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157 | (72) |
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157 | (3) |
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4.2 Analogue Intensity Modulation (AIM) |
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160 | (2) |
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4.3 Digital Baseband Modulation Techniques |
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162 | (9) |
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4.3.1 Baseband Modulations |
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162 | (1) |
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4.3.2 PAM and On-Off Keying (OOK) |
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163 | (4) |
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4.3.3 OOK Error Performance in AWGN Channel |
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167 | (4) |
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4.4 Pulse Position Modulation |
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171 | (7) |
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4.4.1 PPM Error Performance |
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173 | (3) |
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176 | (2) |
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177 | (1) |
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178 | (1) |
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4.4.2.3 Differential Amplitude Pulse Position Modulation (DAPPM) |
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178 | (1) |
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4.5 Pulse Interval Modulation (PIM) |
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178 | (14) |
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4.5.1 DPIM Error Performance |
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183 | (5) |
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4.5.1.1 DPIM with No Guard Band |
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186 | (1) |
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4.5.1.2 DPIM with One Guard Slot |
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187 | (1) |
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4.5.2 Optimum Threshold Level |
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188 | (4) |
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4.6 Multilevel DPIM (MDPIM) |
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192 | (2) |
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4.7 Comparisons of Baseband Modulation Schemes |
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194 | (2) |
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194 | (1) |
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4.7.2 Transmission Bandwidth Requirements |
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194 | (1) |
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4.7.3 Transmission Capacity |
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195 | (1) |
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196 | (1) |
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4.7.5 Peak-to-Average Power Ratio (PAPR) |
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196 | (1) |
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4.8 Subcarrier Intensity Modulation |
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196 | (2) |
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197 | (1) |
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4.8.2 Quadrature Amplitude Modulation (QAM) |
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198 | (1) |
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4.9 Multi-Carrier Modulations |
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198 | (13) |
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4.9.1 Multiple-Subcarrier Intensity Modulation (MSIM) |
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199 | (2) |
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4.9.2 Orthogonal Frequency Division Multiplexing (OFDM) |
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201 | (8) |
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4.9.2.1 OFDM High PAPR Reduction Techniques |
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204 | (2) |
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4.9.2.2 Pilot Signal Estimation at the Receiver |
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206 | (3) |
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4.9.3 Carrierless-Amplitude and Phase Modulation (CAP) |
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209 | (2) |
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4.10 Optical Polarisation Shift Keying (PoLSK) |
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211 | (14) |
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213 | (4) |
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4.10.2 Bit Error Rate Analysis |
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217 | (2) |
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219 | (2) |
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4.10.4 Differential Circle Polarisation Shift Keying (DCPoLSK) |
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221 | (2) |
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4.10.5 Error Probability Analysis |
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223 | (1) |
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4.10.6 Comparison of BPOLSK, OOK, and BPSK-Based FSO Links |
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224 | (1) |
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225 | (4) |
Chapter 5 Indoor System Performance Analysis |
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229 | (72) |
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5.1 The Effect of Ambient Light Sources on Indoor OWC Link Performance |
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229 | (1) |
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5.2 Fluorescent Light Interference with no Electrical High-Pass Filtering |
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230 | (8) |
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231 | (7) |
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5.3 BLW without Fluorescent Light Interference |
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238 | (8) |
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5.4 Fluorescent Light Interference with Electrical High-Pass Filtering |
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246 | (3) |
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249 | (16) |
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5.5.1 The Continuous Wavelet Transform (CWT) |
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253 | (2) |
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5.5.2 The Discrete Wavelet Transform (DWT) |
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255 | (1) |
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5.5.3 DWT Based Denoising |
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256 | (5) |
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5.5.4 Comparative Study of DWT and HPF |
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261 | (1) |
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5.5.5 Experimental Investigations |
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262 | (3) |
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5.5.5.1 On-Off Keying (OOK) |
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262 | (3) |
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5.6 Link Performance in Multipath Propagations |
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265 | (10) |
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5.6.1 On-Off Keying (OOK) |
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265 | (7) |
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5.6.2 Pulse Position Modulation (PPM) |
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272 | (2) |
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5.6.3 Digital Pulse Internal Modulation (DPIM) |
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274 | (1) |
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5.7 Mitigation Techniques |
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275 | (7) |
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275 | (1) |
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276 | (6) |
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5.7.2.1 The Zero Forcing Equaliser |
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278 | (1) |
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5.7.2.2 The Minimum Mean Square Error Equaliser (MMSE) |
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279 | (2) |
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5.7.2.3 The Decision Feedback Equaliser (DFE) |
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281 | (1) |
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5.8 Equalisation as a Classification Problem |
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282 | (1) |
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5.9 Introduction to Artificial Neural Network |
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282 | (3) |
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283 | (1) |
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284 | (1) |
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285 | (1) |
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5.10.1 Backpropagation Learning (BP) |
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286 | (1) |
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5.11 The Ann-Based Adaptive Equaliser |
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286 | (9) |
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5.11.1 Comparative Study of the ANN- and FIR-Based Equalisers |
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292 | (2) |
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5.11.2 Diversity Techniques |
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294 | (1) |
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295 | (6) |
Chapter 6 FSO Link Performance with Atmospheric Turbulence |
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301 | (46) |
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301 | (6) |
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6.1.1 OOK in a Poisson Atmospheric Optical Channel |
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302 | (2) |
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6.1.2 OOK in a Gaussian Atmospheric Optical Channel |
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304 | (3) |
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6.2 Pulse Position Modulation |
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307 | (4) |
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6.3 Subcarrier Intensity Modulation |
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311 | (24) |
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6.3.1 SIM Generation and Detection |
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312 | (2) |
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6.3.2 SIM-FSO Performance in Log-Normal Atmospheric Channel |
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314 | (4) |
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6.3.3 Bit Error Probability Analysis of SIM-FSO |
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318 | (10) |
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6.3.3.1 BPSK-Modulated Subcarrier |
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319 | (6) |
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6.3.3.2 M-ary PSK-Modulated Subcarrier |
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325 | (1) |
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6.3.3.3 DPSK-Modulated Subcarrier |
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325 | (1) |
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6.3.3.4 Multiple SIM Performance Analysis |
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326 | (2) |
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328 | (4) |
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6.3.4.1 In a Log-Normal Atmospheric Channel |
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330 | (2) |
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6.3.5 SIM-FSO Performance in Gamma-Gamma and Negative Exponential Atmospheric Channels |
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332 | (2) |
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6.3.6 Outage Probability in Negative Exponential Model Atmospheric Channels |
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334 | (1) |
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6.4 Atmospheric Turbulence-Induced Penalty |
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335 | (4) |
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339 | (5) |
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344 | (1) |
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344 | (3) |
Chapter 7 Outdoor OWC Links with Diversity Techniques |
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347 | (50) |
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348 | (2) |
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7.2 Spatial Diversity Techniques |
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350 | (14) |
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353 | (3) |
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7.2.1.1 Adaptive Optics Schemes |
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353 | (1) |
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7.2.1.2 Linear Combining Techniques |
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354 | (2) |
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7.2.2 Maximum Ratio Combining (MRC) |
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356 | (1) |
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7.2.3 Equal Gain Combining (EGC) |
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357 | (2) |
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7.2.4 Selection Combining (Se1C) |
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359 | (1) |
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7.2.5 Effect of Received Signal Correlation on Error Performance |
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360 | (2) |
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7.2.6 Outage Probability with Receiver Diversity in a Log-Normal Atmospheric Channel |
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362 | (2) |
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7.3 Transmitter Diversity in a Log-Normal Atmospheric Channel |
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364 | (1) |
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7.4 Transmitter-Receiver Diversity in a Log-Normal Atmospheric Channel |
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364 | (1) |
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7.5 Results and Discussions of SIM-FSO with Spatial Diversity in a Log-Normal Atmospheric Channel |
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365 | (3) |
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7.6 SIM-FSO with Receiver Diversity in Gamma-Gamma and Negative Exponential Atmospheric Channels |
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368 | (10) |
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7.6.1 BER and Outage Probability of BPSK-SIM with Spatial Diversity |
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369 | (3) |
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7.6.2 BER and Outage Probability of DPSK-SIM in Negative Exponential Channels |
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372 | (6) |
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7.7 Terrestrial Free-Space Optical Links with Subcarrier Time Diversity |
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378 | (6) |
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7.7.1 Error Performance with STDD |
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378 | (2) |
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7.7.2 Error Performance of Short-Range Links |
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380 | (1) |
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380 | (1) |
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381 | (1) |
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382 | (2) |
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384 | (2) |
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384 | (1) |
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385 | (1) |
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385 | (1) |
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386 | (3) |
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389 | (1) |
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390 | (1) |
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391 | (1) |
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392 | (5) |
Chapter 8 Visible Light Communications |
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397 | (72) |
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397 | (6) |
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403 | (2) |
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405 | (20) |
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408 | (10) |
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8.3.2 Channel Delay Spread |
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418 | (3) |
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8.3.3 Holographic Diffuser |
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421 | (1) |
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422 | (3) |
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8.4 System Implementations |
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425 | (9) |
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8.4.1 On-Off Keying (OOK) with a Forward Error Correction |
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426 | (1) |
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8.4.2 Bit Angle Modulation (BAM) |
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427 | (1) |
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8.4.3 Pulse Modulation Schemes |
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428 | (2) |
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8.4.4 PWM with Discrete Multitone Modulation (DMT) |
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430 | (2) |
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432 | (2) |
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434 | (1) |
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8.5 Multiple-Input, Multiple-Output (MIMO) VLC |
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434 | (6) |
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8.6 Orthogonal Frequency Division Multiplexing (OFDM) |
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440 | (3) |
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8.6.1 Channel Estimation, Equalisations, and Synchronisation |
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440 | (3) |
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443 | (6) |
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449 | (3) |
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452 | (4) |
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456 | (13) |
Chapter 9 Relay-Assisted FSO Communications |
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469 | (22) |
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469 | (3) |
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9.1.1 FSO Network Topologies |
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470 | (2) |
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9.2 Relay-Assisted Communications |
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472 | (4) |
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474 | (1) |
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474 | (1) |
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9.2.3 All-Optical Relay-Assisted FSO Communications |
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475 | (1) |
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9.3 All-Optical Amplify-and-Forward |
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476 | (3) |
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9.3.1 Optical Amplification |
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476 | (3) |
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9.3.1.1 Erbium-Doped Fibre Amplifier |
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|
478 | (1) |
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9.3.1.2 Semiconductor Optical Amplifier |
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478 | (1) |
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9.3.1.3 Comparison of EDFAs and SOAs |
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478 | (1) |
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9.4 All-Optical Regenerate-and-Forward |
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479 | (3) |
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|
479 | (2) |
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9.4.2 SPM-Based Optical Regenerator |
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481 | (1) |
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9.4.3 Highly Nonlinear Fibres |
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482 | (1) |
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9.5 All-Optical Aoaf Relay-Based FSO with Turbulence |
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482 | (4) |
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|
486 | (5) |
Index |
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491 | |