Wireless Optical Communication Systems (Google eBook)

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Springer Science & Business Media, Jan 16, 2006 - Technology & Engineering - 197 pages
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The use of optical free-space emissions to provide indoor wireless com- nications has been studied extensively since the pioneering work of Gfeller and Bapst in 1979 [1]. These studies have been invariably interdisciplinary - volving such far flung areas such as optics design‚ indoor propagation studies‚ electronics design‚ communications systems design amongothers. The focus of this text is on the design of communications systems for indoor wireless optical channels. Signalling techniques developed for wired fibre optic n- works are seldom efficient since they do not consider the bandwidth restricted nature of the wireless optical channel. Additionally‚ the elegant design meth- ologies developed for electrical channels are not directly applicable due to the amplitude constraints of the optical intensity channel. This text is devoted to presenting optical intensity signalling techniques which are spectrally efficient‚ i. e. ‚ techniques which exploit careful pulse design or spatial degrees of freedom to improve data rates on wireless optical channels. The material presented here is complementary to both the comprehensive work of Barry [2] and to the later book by Otte et al. [3] which focused prim- ily on the design of the optical and electronic sub-systems for indoor wireless optical links. The signalling studies performed in these works focused p- marily on the analysis of popular signalling techniques for optical intensity channels and on the use of conventional electrical modulation techniques with some minor modifications (e. g. ‚ the addition of a bias).
  

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Contents

5A Continuous Approximation of the Power Spectral Density
103
6 CHANNEL CAPACITY
105
62 Problem Definition
108
63 Bandwidth Constraint
109
64 Upper bound on Channel Capacity
110
65 Lower bound on Channel Capacity
114
66 Examples and Discussion
116
67 Conclusions
123

25 Summary
34
3 AN INTRODUCTION TO OPTICAL INTENSITY SIGNALLING
37
32 Bandwidth
46
33 Example Modulation
50
Signalling Design
65
4 OPTICAL INTENSITY SIGNAL SPACE MODEL
66
42 Examples
76
43 Conclusions
80
5 LATTICE CODES
81
51 Definition of Lattice Codes
82
52 Constellation Figure of Merit Gain
85
53 Baseline Constellation
87
55 Gain versus a Baseline Constellation
89
57 Coding Gain
90
58 Shaping Gain
91
Expression
92
PeakSymmetric Schemes
93
511 Opportunistic Secondary Channels
94
513 Conclusions
101
MultiElement Techniques
124
THE MULTIPLEINPUT MULTIPLEOUTPUT WIRELESS OPTICAL CHANNEL
125
71 Previous Work
126
72 The MIMO Wireless Optical Channel
129
73 Design Challenges
135
74 PixelMatched System
137
75 The Pixelated Wireless Optical Channel
139
76 Conclusions
145
PROTOTYPE MIMO OPTICAL CHANNEL MODELLING AND SPATIOTEMPORAL CODING
147
82 Channel Model
152
83 PixelMatched Systems
163
84 Pixelated Wireless Optical Channel
164
85 Conclusions
173
CONCLUSIONS AND FUTURE DIRECTIONS
175
92 Future Work
176
References
180
Index
193
About the Author
195
Copyright

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