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Challenges in bit-pattered magnetic recording (BPMR) include two-dimensional (2D) inter-symbol interference (ISI) constituted by both one-dimensional ISI and inter-track interference (ITI), and media noise arising from island position jitter (PJ) and island size fluctuations (SF) in both the down-track and cross-track directions. A LDPC code optimization approach is proposed for BPMR channel with...
Avalanche photo-diodes (APD) are widely employed in visible light communication (VLC) systems. Experiments show that under official illuminance APD shot noise can not be ignored due to the multiplication process. Under VLC dual-purpose illumination, symbols on different constellation points inevitably experience different levels of noise. In such a signal dependent noise channel, traditional log likely-hood...
The protograph LDPC (P-LDPC) coded modulation is an efficient scheme using the variable degree matched mapping (VDMM) based on the protograph structure. We propose a VDMM optimization strategy, as a crucial part for the P-LDPC coded modulation, by checking different permutation patterns between the variable nodes in protograph and the modulated bits. Then, we develop a modified EXIT analysis for evaluating...
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