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.