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• W1522464062 abstract "High-speed wireless optical communication links have become more popular forpersonal mobile applications. This is a consequence of the increasing demandfrom the personal information service boom. Compared to the radio frequencydomain, optical wireless communication offers much higher speeds and bit ratesper unit power consumption. As stated by the official infrared standard IrDAoptical communication enjoys much lower power consumption than Bluetooth,with an inherent security feature while in Line of Sight (LOS) applications. Thereare also drawbacks such as the infrared radiation cannot penetrate walls as radiofrequencies do and interference from the background contribute to the channeldispersions.Focus on the modulation aspects of the optical wireless communication, thisthesis try to improve the channel immunity by utilising optimised modulation tothe channel. Modulation schemes such as on off keying (OOK), pulse amplitudemodulation (PAM) and pulse position modulation (PPM) and pulse position andamplitude modulation PAPM schemes have been validated. The combined powerand bandwidth requirements suggest that the adaptive modulation schemes canprovide reliability when deployed in a real time channel, resulting in improvedsystem performance.As a result, an adaptive modulation technique is proposed. Extensive simulationsof severe noise distraction have been carried out to validate the new scheme. Thesimulation results indicate that the new scheme can provide increased immunityagainst channel noise fluctuation at a relatively low complexity. The schemeobtained formed a basis to support reliable mobile optical wirelesscommunication applications.The adaptive scheme also takes the real time channel conditions into account,which is different from existing schemes. Guaranteed system performance can besecured without compromising power and bandwidth efficiency. This is also anew approach to realise reliable optical wireless links. Fuzzy logic controlmodule has been developed to match the adaptive pattern." @default.
• W1522464062 created "2016-06-24" @default.
• W1522464062 creator A5089797140 @default.
• W1522464062 date "2010-04-01" @default.
• W1522464062 modified "2023-09-23" @default.
• W1522464062 title "Adaptive modulation schemes for optical wireless communication systems" @default.
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• W1522464062 hasPublicationYear "2010" @default.
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