Abstract
Analog fountain codes (AFC) are a class of near-capacity rateless codes which have a great potential for meeting the requirements of ultra-reliable low latency communication. In this letter, an online feedback scheme is introduced to enhance error performance and achievable rate of AFC. The retransmission messages are chosen according to Euclidean distance between AFC codewords. Our simulation results show that the proposed online AFC can improve achievable rate up to 0.49 bits/symbols at 25 dB, and reduce block error rate by more than one order of magnitude.
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