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Introduction to OFDM

1E225C Lecture 16 OFDM IntroductionEE225 CEE225 CIntroduction to OFDMlBasic idea Using a large number of parallel narrow-band sub-carriers instead of a single wide-band carrier to transport informationlAdvantages Very easy and efficient in dealing with multi-path Robust again narrow-band interferencelDisadvantages Sensitive to frequency offset and phase noise Peak-to-average problem reduces the power efficiency of RF amplifier at the transmitterlAdopted for various standards DSL, , DAB, DVB2 Multipath can be described in two domains: time and frequencytimetimeSinusoidal signal as inputtimetimeSinusoidal signal as outputfFrequency responseTime domain: Impulse responseFrequency domain: Frequency responsetimeImpulse responsetimetimeModulationtechniques: monocarrier vs.

OFDM Introduction EE225C Introduction to OFDM lBasic idea ... – Selective Fading – Very short pulses – ISI iscompartively long – EQs are then very long – Poor spectral efficiency because of band guards Drawbacks ... 2 4 6 8 10 12 14 16-60-55-50-45-40-35-30-25-20-15-10

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