Increasing the rate of wireless link when multiple QoS traffics are considered

This document provides a system analysis for hitless flexible data rate adapted to the received power variation with fixed spectrum. In our investigation, we are interested in digital line-of-sight (LOS) microwave links. The channel fading state, the grade of service and the adaptive modulation scheme are examined. Essentially, the flexible communication scheme consists in modifying, from one frame to the next, the modulation level used to communicate on a wireless link. The radio thus provides for significant capacity gains if traffic streams requiring different quality of service are being communicated. Most significant scenarios are considered and quantified to obtain a realistic analysis of the grades of services allocated to each traffic stream. We show as an example, that a 25 Mbit/s carrier grade link (99.9995% availability) may be modified into the sum of a 25 Mbit/s carrier grade link with a 100 Mbit/s data link of 99.9% availability.