LLR Calculation for Iterative Decoding on Rayleigh Fading Channels using Pade Approximation

摘要

In this paper, approximate calculation of channel log likelihood ratio (LLR) for wireless channels using Pade approximation is devised, Due to the lack of knowledge of the channel state information of a wireless fading channel, such as uncorrelated flat Rayleigh fading channels, calculation of exact LLR for these channels is quite complicated for a practical implementation. By applying the proposed approximation to the iterative decoding and the low-density parity-check codes, we show the effectiveness of the proposed methods.