LOG-LIKELIHOOD RATIOLLR COMPUTATION USING PIECEWISE LINEAR APPROXIMATION OF LLR FUNCTIONS

摘要

code bits of the LLR (log-likelihood ratio) to efficiently and accurately describing the calculation and description. Code bit set may be mapped to a modulation symbol in the signal constellation. Different code bits in the code bit set may be associated with different LLR functions. The receiver obtains received symbols for the transmission sent via a communication channel. The receiver is based on at least one of the piecewise linear approximation of the received symbol and the LLR function deriving an LLR for the code bits. The piecewise linear approximation of each LLR function may comprise at least one of a range of at least a linear function of the input value. The receiver may be based on a corresponding received symbol component value, select one of the linear functions for each code bit. Then, the receiver can be based on the linear function selected for the first code bit to derive an LLR for each code bit.