Optimal Allocation of Redundancy Between Packet-Level Erasure Coding and Physical-Layer Channel Coding in Fading Channels

A Practical Physical-Layer Network Coding for Fading Channels

Utility Optimal Coding for Packet Transmission over Wireless Networks – Part II: Networks of Packet Erasure Channels

We define a class of multi–hop erasure networks that approximates a wireless multi–hop network. The network carries unicast flows for multiple users, and each information packet within a flow is required to be decoded at the flow destination within a specified delay deadline. The allocation of coding rates amongst flows/users is constrained by network capacity. We propose a proportional fair tr...

Packet-Layer Forward Error Correction Coding for Fading Mitigation

In an on/off-keying atmospheric optical communication system, index of refraction turbulence and PAT (pointing, acquisition and tracking) instabilities create strong and very slow fading compared to the usually used high data-rates. With this channel behavior, forward error correction can only work effectively if the codeword-length is longer than the mean duration of fade. Therefore packet-lay...

Joint Cache-Channel Coding over Erasure Broadcast Channels

We consider a cache-aided communications system in which a transmitter communicates with many receivers over an erasure broadcast channel. The system serves as a basic model for communicating on-demand content during periods of high network congestion, where some content can be preplaced in local caches near the receivers. We formulate the cacheaided communications problem as a joint cache-chan...

Optimal Coding for the Erasure Channel with Arbitrary Alphabet Size

An erasure channel with a fixed alphabet size q, where q ≫ 1, is studied . It is proved that over any erasure channel (with or without memory), Maximum Distance Separable (MDS) codes achieve the minimum probability of error (assuming maximum likelihood decoding). Assuming a memoryless erasure channel, the error exponent of MDS codes are compared with that of random codes and linear random codes...