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It is commonly agreed that the next generation of wireless optical communication systems, usually referred to as fourth generation systems, will not be based on a single access technique but it will encompass a number of different complementary access technologies. Communication topics such as modulation, multiplexing, and detection are discussed in relation to optical wireless links. Negative channel effects such as dispersion and absorption are investigated with respect to their impact on the channel and the associated bit error rates. The challenges posed by atmospheric disturbances are considered for free space links.
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