A Simplified Log-Likelihood Ratio Algorithm with Broken Line Analysis
一种基于折线逼近的对数似然比简化算法

In this paper, a novel simplified algorithm with broken line analysis is proposed for the log-likelihood ratio calculation of 16QAM signals. In this novel algorithm several line segments are introduced to approach the LLR curves of 16QAM signals, which results that the complicated nonlinear computations in the optimum algorithm are replaced with simple linear one. The simulation show that the algorithm in this paper can be a perfect approach to the optimum LLR algorithm in calculation results; and the performance will not degrade when it is applied in BITCM systems.