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In terms of overall latency, one of the main bottlenecks of successive cancellation list (SCL) decoding of polar codes is the path pruning unit (PPU), whose goal is to prune $2L$ paths to $L$ paths. To remedy this shortcoming, we propose a two-step metric sorter adapted to a parallel implementation of SCL decoding. We describe our sorter architecture and we show that our proposed solution outperforms...
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