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Multipath fading

Multipath fading

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Fading characterizes the effect of random superposition of signal copies received from different propagation paths. These signal replicas may add together constructively or destructively, which leads to a large variation in received signal strength. Multipath fading manifests itself in a much smaller spatial scale than path loss and shadowing, and therefore, is called the small-scale effect of wireless channel. In this chapter, we first develop the general model for multipath fading channels. Then, we discuss the classification of fading channels based on their time domain and frequency domain characteristics. Finally, we present simplified models for two important types of multipath fading channels, which are widely used in the design and analysis of digital wireless transmission systems.

Chapter Contents:

  • 3.1 General fading channel model
  • 3.2 Time-domain variation
  • 3.2.1 Doppler effect
  • 3.2.2 Slow vs fast fading
  • 3.3 Multipath delay spread
  • 3.3.1 Power delay profile
  • 3.3.2 Frequency-flat vs frequency-selective fading
  • 3.4 Simplified models for fading channels
  • 3.4.1 Frequency-flat fading
  • 3.4.2 Autocorrelation of complex channel gain
  • 3.4.3 Frequency-selective fading
  • 3.5 Further readings
  • Problems
  • Bibliography

Inspec keywords: radiowave propagation; RSSI; fading channels; multipath channels; time-domain analysis; frequency-domain analysis

Other keywords: wireless channel; propagation paths; received signal strength; digital wireless transmission systems; signal copies; signal replicas; time domain characteristics; frequency domain characteristics; multipath fading channels; path loss

Subjects: Radiowave propagation; Radio links and equipment; Mathematical analysis

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