25 October 2004 Free-space optics supporting multi-user communications for wireless mesh networks
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For free space optics to support multi user communications, multi-access schemes need to be incorporated. Conventional asynchronous optical code division multiple access (OCDMA) using optical orthogonal codes (OOCs) cannot deliver the required performance due to code interference, which sets a lower bound on the achievable bit error rate. Thus we introduce the use of complementary Walsh Hadamard codes as a promising solution to support synchronous OCDMA, capable of achieving required performance due to inherent interference cancellation, in addition to supporting a higher number of users while maintaining short code lengths, and alleviating some of the stringent requirements on the receiver hardware.
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Belal Y. Hamzeh, Belal Y. Hamzeh, Mohsen Kavehrad, Mohsen Kavehrad, } "Free-space optics supporting multi-user communications for wireless mesh networks", Proc. SPIE 5598, Performance, Quality of Service, and Control of Next-Generation Communication Networks II, (25 October 2004); doi: 10.1117/12.570667; https://doi.org/10.1117/12.570667

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