Astro Simulcast System Throughput Optimization via Launch Time Offset Auto Calibration
Original Publication Date: 2002-Mar-18
Included in the Prior Art Database: 2002-Mar-18
In current Astro Simulcast Systems, the Launch Time Offset is a static configurable parameter residing in the comparator used to determine how far in the future the station will begin a simulcast transmission. In order to optimize this value, service personnel need to find the simulcast sub-site with highest expected link delay, and manually perform optimization. The link delays will change over time requiring this procedure to be repeated at regular intervals. This is a difficult procedure whose outcome directly impacts system audio throughput delays. The existing manual optimization procedure is cumbersome, time consuming, and does not automatically adapt to changing link delays. The procedure measures link delay between the comparator and the base station. The station's processing latency factor also needs to be considered in order to yield a safe Launch Time Offset value that can be stored in the comparator. As a result, conservative values have been used for the Launch Time Offset resulting in systems being fielded with higher than necessary audio throughput delays and high overall subscriber access times.