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10. types of small scale fading

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JAIGANESH SEKAR
JAIGANESH SEKAR

10. types of small scale fading

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WIRELESS COMMUNICATION SERIES Types of Small Scale Fading
Lecture Videos are available for this slides at www.youtube.com/gurukula Support by Subscribing to my Channel
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
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
FADING SMALL SCALE FADING MULTIPATH DELAY SPREAD FLAT FADING FREQUENCY SELECTIVE FADING DOPPLER SPREAD FAST FADING SLOW FADING LARGE SCALE FADING PATH LOSS SHADOWING
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.

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10. types of small scale fading

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  • 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
  • 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.