Patent ID: 9647860
Date: 2017-05-09
CPC Classifications: H04L,H04N

Claim:
1. A soft demapper, comprising: a soft data generator, configured to calculate a plurality of first soft data in a multimedia data stream; a scaling factor determination module, configured to search 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; a channel response generation module, configured to determine a first channel response according to the channel information and to perform correlation operation on the first channel response and the found scaling factor to generate a second channel response; and a dynamic channel calibration module, configured to combine the second channel response and the plurality of first soft data to generate a plurality of second soft data; wherein the scaling factor determination module further determines the channel information and the encoding rate information according to Transmission and Multiplexing Configuration Control (TMCC) information carried in the multimedia data stream.