Global ETD Search

1	Generalized belief propagation based TDMR detector and decoder Matcha, Chaitanya Kumar, Bahrami, Mohsen, Roy, Shounak, Srinivasa, Shayan Garani, Vasic, Bane 07 1900 (has links) Two dimensional magnetic recording (TDMR) achieves high areal densities by reducing the size of a bit comparable to the size of the magnetic grains resulting in two dimensional (2D) inter symbol interference (ISI) and very high media noise. Therefore, it is critical to handle the media noise along with the 2D ISI detection. In this paper, we tune the generalized belief propagation (GBP) algorithm to handle the media noise seen in TDMR. We also provide an intuition into the nature of hard decisions provided by the GBP algorithm. The performance of the GBP algorithm is evaluated over a Voronoi based TDMR channel model where the soft outputs from the GBP algorithm are used by a belief propagation (BP) algorithm to decode low-density parity check (LDPC) codes. channel capacity channel coding computational geometry intersymbol interference magnetic recording parity check codes LDPC TDMR detector Voronoi based TDMR channel model decoder generalized belief propagation low-density parity check codes magnetic grains media noise two dimensional intersymbol interference two dimensional magnetic recording Algorithm design and analysis Approximation algorithms Channel models Erbium Media Signal processing algorithms Two dimensional displays