IMPROVED SIGNAL QUALITY METRIC
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-15
This invention provides an improved signal quality metric algorithm over the existing method(s). The signal quality metric can be used in any application incorporating a Trellis decoding algorithm. This metric can be and is used as an indi- cation of the quality of the Trellis encoded data. As an example, in a Motorola Astro-TAC voting sys- tem, this metric is used to determine which received signal gets voted as the best signal. DESCRIPTION A Trellis decoder does not, unfortunately, pro- vide one with information as to how many bits were in error in a given transmitted Trellis encoded block of data. It can provide a final Viterbi metric if the Viterbi decoding algorithm is used, but this metric does not provide a good signal quality metric by itself. Other experimental algorithms utilizing aver- age energy in the Trellis encoded block or algo- rithms using the number of common distances in the distance metric table work quite well under static conditions, but are rather poor performers under faded conditions.