Toward New Link Layer Protocols

This paper describes an experimental new link layer protocol for amateur packet radio use. It extends my earlier MACA scheme for dealing with hidden terminals by incorporating a powerful forward error correction (FEC) scheme: convolutional coding with sequential decoding. The resulting hybrid protocol combines the best of the FEC and retransmission (ARQ) techniques. It should perform very well in the presence of hidden terminals, noise and interference, particularly pulsed radar QRM like that often found on the 70cm amateur band. 1. Introduction AX.25 [1] is now 12 years old. Although it has become the universal standard link level protocol for amateur packet radio, it is widely recognized as being far from optimal. The experience of the past decade plus significant advances in the computer technology now available to the radio amateur suggest that we look at much more sophisticated alternatives. These techniques have existed for many years 1 ,but only now have powerful modern PCs b..

Proceedings of the ACM symposium on Communications architectures & protocols [electronic resource].

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