Affected platforms: ePMP4500/ePMP4500C and ePMP4600
Affected versions: 5.8.0 and newer
Starting with the 5.8 firmware, the ePMP4500/4500C (8x8) and ePMP4600 (4x4) devices leverage the advantages of a multi-chain hardware architecture to significantly improve downlink signals through beamforming. This feature is enabled by default but can be disabled for testing purposes in the Configuration → Radio section of the web interface.
Beamforming in multi-antenna systems is a signal processing technique that directs the transmission of signals in a specific direction. The core idea is to combine signals to constructively interfere in the desired direction, creating a focused beam of radio waves. By carefully controlling the phase and amplitude, signals add up constructively in the intended direction.
Expected downlink beamforming gains:
- ePMP4500/4500C (8x8): up to +6 dB
- ePMP4600 (4x4): up to +3 dB
Note: Beamforming gain is not reflected in the UI (the RSSI level doesn’t increase); it is observed only in the higher modulation and coding schemes (MCSs) during packets transmission
Benefits of Beamforming
- Improved Signal Quality: Increases SINR and enhances the reliability of the signal.
- Increased Range: Extends the coverage area by directing the signal where it is needed.
- Higher Capacity: Allows for more simultaneous data streams, increasing network capacity.
- Better Reliability: Provides a more stable and consistent connection.