LOG-LIKELIHOOD RATIO (LLR) COMPUTATION USING PIECEWISE LINEAR APPROXIMATION OF LLR FUNCTIONS

摘要

PROBLEM TO BE SOLVED: To provide techniques for efficiently and accurately computing LLRs for code bits.

SOLUTION: A receiver obtains received symbols for a transmission sent via a communication channel. The receiver derives LLRs for code bits on the basis of the received symbols and piecewise linear approximation of at least one LLR function. The piecewise linear approximation of each LLR function may comprise one or more linear functions for one or more ranges of input values. The receiver may select one of the linear functions for each code bit on the basis of a corresponding received symbol component value. The receiver may then derive an LLR for each code bit on the basis of the linear function selected for that first code bit.

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