|Question||What is "Temporal Diversity" and how is it enabled in controller configuration?|
|Environment||This article applies to Aruba Mobility Controllers running ArubaOS version.|
In a typical wireless communication environment, multiple propagation paths often exist from a transmitter to a receiver due to scattering by different objects. Signal copies following different paths can undergo different attenuation, distortions, delays and phase shifts. Constructive and destructive interference can occur at the receiver. When destructive interference occurs, the signal power can be significantly diminished. This phenomenon is called fading.
Diversity techniques can be used to improve system performance in fading channels. Instead of transmitting and receiving the desired signal through one channel, we obtain L copies of the desired signal through M different channels. The idea is that while some copies may undergo deep fades, others may not. We might still be able to obtain enough energy to make the correct decision on the transmitted symbol. There are several different kinds of diversity techniques which are commonly employed in wireless communication systems.
One such technique is called as Temporal diversity where the signal is transmitted repeatedly at multiple times. When this feature is enabled and the client is not responding to 802.11 packets, the AP will launch two hardware retries; if the hardware retries are not successful then it attempts software retries. By default, this setting is disabled in the HT-SSID profile.
"Temporal diversity" configuration is a part of "HT-SSID Profile" and below screenshots show how to enable from GUI and CLI:
From Command Line Interface: