A communication channel describes how transmitted inputs become received outputs. In a probabilistic model, conditional probabilities specify which outputs each input can produce. A discrete memoryless channel uses the same finite transition law independently on successive symbols; channel capacity quantifies its optimal reliable transmission rate.
Information about earlier received outputs made available to the channel encoder while choosing subsequent inputs. For repeat-until-success coding over an erasure channel, an erasure report tells the sender to repeat the current bit, while a success report tells it to advance. A forward code rate calculation must specify whether this return communication is supplied freely or included in the resource count.
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A communication channel refers to the medium or method used to convey information between individuals or groups. It can encompass a wide range of formats and tools, including: 1. **Verbal Communication**: This includes face-to-face conversations, phone calls, video conferences, and speeches. 2. **Written Communication**: This includes emails, text messages, letters, reports, and social media posts.