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US 2004/0168114 A1Published application
Soft information scaling for iterative decoding
AssigneeQUALCOMM Incorporated
InventorsTom Richardson, Vladimir Novichkov, Hui Jin
Life of this patent
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AssigneeQUALCOMM Incorporated
InventorsTom Richardson, Vladimir Novichkov, Hui Jin
Estimating the term…
Methods and apparatus for scaling soft values as part of an error correction decoding process are described. Accurate decoding depends on use of the appropriate scale factor. Selection and use of the scale factor to scale soft values is designed to improve and/or optimize decoder performance without the need for prior knowledge of the correct scale factor or the actual channel conditions at the time the signal from which the soft values were obtained was transmitted through a communications channel. The techniques of the present invention assume that the soft values to be processed were transmitted through a communications channel having a quality that can be accurately described by a channel quality value. A scale factor is determined from the distribution of soft values to be scaled and an assumption that the channel through which they were transmitted was of the quality corresponding to a preselected channel quality value.
A method of operating an apparatus to scale soft input values obtained, from a signal transmitted through a communications channel, as part of a decoding process, the method comprising:
An apparatus for determining a factor to be used to scale soft input values obtained, from a signal transmitted through a communications channel, comprising:
A machine readable medium comprising;
Dependencies are inferred from the claim text.