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The authors consider downlink Access Point (AP) networks and the corresponding reliable transmission schemes. It is well known that one can protect the network traffic against packet erasures by Forward-Error-Correcting-codes (FEC). In addition to ensuring reliable delivery, FECs could substantially reduce the amount of feedback traffic, which is critical when designing high-performance AP protocols. In this paper, they generalize the FEC-based schemes, also known as intra-flow coding schemes, for multiple downlink flows. In contrast with the classic approach that performs FEC separately on individual flows, they propose a new protocol MU-FEC, which incorporates the recent idea of inter-flow coding to further enhance the achievable throughput.
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