Reducing Time-Delay Interference in Mission-Critical Situations (.PDF Download)

Critical as voice communications are for first responders, time-delay interference (TDI) is a technical effect that could potentially disrupt this vital link. Reducing the effects of TDI should therefore be a priority for all system integrators and design engineers who want to achieve maximum reliability for voice communications systems used in emergencies. In a distributed antenna system (DAS) for in-building wireless networks, there are several ways to reduce TDI to make sure first responders have a clear voice channel in any situation.

Antenna isolation, system delay, and DAS “dominance” are some of the more important ways of mitigating TDI effects. Those will be explored further, but first, a review of the TDI causes will enable a greater capacity for problem solving.