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10. types of small scale fading
- 1. WIRELESS COMMUNICATION SERIES Types of Small Scale Fading
- 2. Lecture Videos are available for this slides at www.youtube.com/gurukula Support by Subscribing to my Channel
- 3. Based on Time Delay Spread Based on Doppler Spread Leads to TIME Dispersion Leads to FREQUENCY Dispersion FLAT FADING FREQUENCY SELECTIVE FADING FAST FADING SLOW FADING BW of signal < BW of Channel Delay Spread < Symbol Period BW of signal > BW of Channel Delay Spread > Symbol Period High Doppler Spread Coherence Time < Symbol Period BW of Channel Varies FASTER than BW of signal Low Doppler Spread Coherence Time > Symbol Period BW of Channel Varies SLOWER than the BW of Signal Bs << Bc 𝝈 𝝉 ≪ Ts Bs >> Bc 𝝈 𝝉 ≫ Ts Tc << Ts Bs << BD Tc >> Ts Bs >> BD
- 4. Based on Time Delay Spread Based on Doppler Spread FLAT FADING FREQUENCY SELECCTIVE FADING FAST FADING SLOW FADING Bs << Bc 𝝈 𝝉 ≪ Ts Bs >> Bc 𝝈 𝝉 ≫ Ts Tc << Ts Bs << BD Tc >> Ts Bs >> BD Ts Ts Bs Bs 𝜎𝜏 Tc Bc BD FLAT FLAT SLOW FAST SLOW FAST FREQ. SEL FREQ. SEL FAST FREQ. SEL SLOW FREQ. SEL FLAT FAST FLAT SLOW MATRIX REPRESENTATION OF FADING AS A FUNCTION OF SYMBOL PERIOD MATRIX REPRESENTATION OF FADING AS A FUNCTION OF SIGNAL BW
- 5. FADING SMALL SCALE FADING MULTIPATH DELAY SPREAD FLAT FADING FREQUENCY SELECTIVE FADING DOPPLER SPREAD FAST FADING SLOW FADING LARGE SCALE FADING PATH LOSS SHADOWING
- 6. Summary of Module – 1 Wireless Channels • Large scale path loss • Path loss models: • Free Space • Two-Ray models • Link Budget design • Log Distance Path Loss Model • Log Normal Shadowing Model • Small scale fading • Parameters of mobile multipath channels • Time dispersion parameters • Coherence bandwidth • Doppler spread & Coherence time, • fading due to Multipath time delay spread • flat fading • frequency selective fading • Fading due to Doppler spread • fast fading • slow fading.