Performance analysis of hybrid ARQ protocols in a slotted direct-sequence code division multiple-access network: jamming analysis

The authors examine the performance of Type I hybrid ARQ (automatic repeat request) in a slotted direct-sequence code division multiple-access packet radio network (PRN) operating in a hostile jamming environment. The PRN consists of an arbitrary number of radio units arranged in a paired-off topology. Throughput-delay expressions are derived in terms of the channel cutoff rate. It is shown that, for a given population size, traffic intensity, and bit-energy-to-jammer-noise ratio, there is an optimal probability of retransmission, code rate, and processing gain that maximizes the throughput in the presence of worst-case pulse jamming