Throughout estimation of ARQ protocols for Raleigh fading channel using fade- and interfade-duration statistics

The throughput for a system using Go-Back-N or selective repeat protocols with Rayleigh fading in both directions of transmission is approximated by using fade- and interfade-duration statistics of a multipath channel. The retransmission for Go-Back-N is based on a time-out concept; for selective repeat it is based on either time-out or negative acknowledge. The estimated results on throughput agree well with simulation results. It is found that, for a slow fading channel (e.g. fading rate=1.34 Hz, encountered by a user at 1 mile/hr walking speed and 900-MHz carrier frequency), the throughput of Go-Back-N is only slightly inferior. This comparatively equal performance results from the burstiness of the channel bit errors. On the other hand, for a fast fading channel (e.g. fading rate=80 Hz), the throughput using selective repeat is significantly superior.<>