Patent ID: 6973143

Claim:
A device for generating, from incoming signal values (X i,n ), soft-values (Y i,n ) to be input into a channel decoder ( 22 ) of a communication device for use in a wireless communication system, comprising: truncation means ( 24 , 26 , 28 ) for truncating said incoming signal values (X i,n ) to fall within a predetermined limit value range to generate truncated signal values (X t i,n ); and normalization means ( 30 , 32 ) for normalizing said truncated signal values (X t i,n ) to fit to an input range of said channel decoder ( 22 ), wherein said truncation means ( 24 , 26 , 28 ) are adapted to determine the boundaries of said predetermined limit value range in dependence on information representative of a signal-to-noise ratio of said incoming signal values (X i,n ), and in that said truncated signal values (X t i,n ) after normalization, are output as said soft-values (Y i,n ), and wherein said truncation means ( 24 , 26 , 28 ) are adapted to calculate, from said incoming signal values (X i,n ), an absolute mean value (m) and to determine said boundaries of said predetermined limit value range based on said absolute mean value (m) multiplied by a scaling factor (1/α), said truncation means ( 24 , 26 , 28 ) being adapted to determine said scaling factor dependent on said information representative of said signal-to-noise ratio.