Adjusting soft values to reduce bias
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorAndreas Cedergren
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Abstract
A method is described for adjusting soft values in a code block prior to decoding. A count of saturated soft values in a code block is determined and one or more of the soft values in the code block are adjusted based on the count of saturated soft values. The count may be determined by incrementing the count for each positive saturated soft value and decrementing the count of each negative saturated soft value. The soft values may be adjusted by adding an offset computed based on the count to the soft values.
Claims16
A method of adjusting soft values input to a decoder in a wireless receiver, said method comprising:
- determining a count of saturated soft values in a code block containing a plurality of soft values output by a demodulator;
- and
- adjusting said soft values in said code block based on said count of saturated soft values to compensate for bias attributable to bit width limitations of the decoder.
A device for adjusting soft values input to a decoder in a wireless receiver, said device comprising:
- a saturation counter to determine a count of saturated soft values in a code block containing a plurality of soft values output by a demodulator;
- and
- an adjustment unit for adjusting one or more soft values in said code block based on said count to compensate for bias attributable to bit width limitations of the decoder.
Dependencies are inferred from the claim text.