Friday, July 15, 2011

Diversity combining

Diversity combining is the technique applied to combine the multiple received signals of a diversity reception device into a single improved signal.

Various diversity combining techniques can be distinguished: 
  • Selection combining: Of the N received signals, the strongest signal is selected
  • Switched combining: The receiver switches to another signal when current signal drops below a predefined threshold. This is a less efficient technique than selection combining.
  • Equal gain combining: All the received signals are summed coherently.
  • Maximal-ratio combining is often used in large phased array systems: The received signals are weighted with respect to their SNR and then summed.

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