Soft Demapper, Calculating System, and Method for Calibrating Soft Data of Multimedia Data Stream

摘要

By determining a scaling factor for scaling signals according to a signal having low bit error rates, and by adjusting soft data using the scaling factor, when soft data are simulated using the Gaussian Model having obvious errors with respect to reality, impacts of signals having low bit error rates are effectively amplified so that impacts of signals having high bit error rates are effectively reduced on the contrary. As a result, the obvious errors introduced by using the Gaussian Model and a low broadcast quality of digital television signals caused by said obvious errors can be neutralized.

主权项

1. A method for calibrating soft data in multimedia data streams, comprising:
calculating a plurality of first soft data in a multimedia data stream; searching for a scaling factor in a lookup table, the scaling factor being corresponding to channel information and encoding rate information carried in the multimedia data stream, wherein the lookup table stores multiple combinations of multiple sets of channel information and multiple encoding rates, each of which comprises information of a scaling factor corresponding to a lowest bit error rate; determining a first channel response according to the channel information and performing correlation operation on the first channel response and the found scaling factor to generate a second channel response; and combining the second channel response and the plurality of first soft data to generate a plurality of second soft data.