Graph-Based Bit-Wise Soft Channel Estimation for Superposition Mapping
Zhenyu Shi1, Peter Adam Hoeher, Abdullah A. Saed
Journal of Intelligent Computing, Vol. 4, No. 1, 2013.
DOI: 
Link: http://www.dline.info/jic/fulltext/v4n1/3.pdf
Abstract:
A novel channel estimator which performs channel estimation bit-wise instead of symbol-wise is proposed in this paper. Combined with superposition mapping (SM), the proposed algorithm is able to provide multiple channel estimates for a single channel coefficient. Numerical results indicate that bit-wise soft channel estimation (BWSCE) is able to outperform symbol-wise soft channel estimation (SWSCE) even at lower computational cost.