Xilinx, Inc.
Sort system including normalization

Abstract:

Apparatuses and methods generally relating to a sort system, such as may be used in a data processing kernel, for list decoding of a Polar codeword are described. In one such sort system, a sorter circuit is configured to receive and sort path metrics for coded bits of the Polar codeword. The path metrics are obtained from log-likelihood ratios associated with the coded bits. A limiter circuit is configured to cull the sorted path metrics to provide a list having a subset of the path metrics to limit output paths of a list decoder. A normalizer circuit is configured to subtract a path metric of the path metrics or a threshold metric representing a minimum metric respectively from entries in the list to provide normalized path metrics to decode the Polar codeword.