A CONVOLUTIONAL CODED ARQ SCHEME WITH RETRANSMISSION CRITERION BASED ON AN ESTIMATED DECODING ERROR RATE

A new Hybrid-ARQ scheme with a convolutional code and the Viterbi deco ding is proposed, which uses the packet combining technique and a retr ansmission criterion based on an estimated decoding error rate. The th roughput and bit error rate are evaluated by theoretical bounds and co mputer simulations. It is shown that a given error rate tolerance can be attained with good throughput for any signal to noise ratio, i.e. f or the slow time-varying channels. Furthermore, the throughput perform ance can be improved by retransmitting not all but a part of packet.