Dr. Arti Yardi  published a paper on EBP-GEXIT Charts for M-ary AWGN Channel for Generalized LDPC and Turbo Codes in IEEE Transactions on Communications. The other authors of this paper are Tarik Benaddi, IMT Atlantique, Nantes, France and  Charly Poulliat, IRIT/INPT-ENSEEIHT, Toulouse, France and Iryna Andriyanova, ETIS/ENSEA, UCP, CNRS, Cergy-Pontoise, France.

Research work as explained by the authors: The maximum a posteriori (MAP) threshold corresponds to the fundamental limit that one can hope to achieve with the given channel code ensemble. Apart from theoretical interests, finding this limit is also desirable since spatial-coupled code ensembles approach this MAP threshold due to phenomenon termed as threshold saturation. However finding this MAP threshold, in general, is known to be computationally prohibitive. This work proposes a tractable method for estimating the MAP threshold for various families of sparse-graph code ensembles over non-binary complex-input additive white Gaussian noise (AWGN) channel. Towards this, we provide a method to approximate the extended belief propagation generalized extrinsic information transfer (EBP-GEXIT) chart and estimate the MAP threshold by applying the Maxwell construction to it. To illustrate the validity of our method, we study spatial coupling for serially-concatenated turbo-codes and numerically observe threshold saturation of these codes to the MAP thresholds estimated via our method.

IEEE Transactions on Communications is a monthly peer-reviewed scientific journal published by the IEEE Communications Society that focuses on all aspects of telecommunication technology, including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation. 

Read full paper: https://ieeexplore.ieee.org/abstract/document/9756446