An efficient ARQ system for mobile communications

摘要

Two modifications of an ARQ (automatic repeat request) scheme proposed by E.J. Weldon (IEEE Trans. on Comm., vol.COM-30, p.480-486, March 1982) for use in systems with limited receiver buffer is studied. Unlike Weldon's scheme in which all erroneous data packets are discarded, the present schemes make use of copies of the data packet which may contain errors. A number of channel models are considered, namely a binary symmetric channel and a nonfading and a Rayleigh fading channel with additive white Gaussian noise. In all cases, it is found that the throughput can be substantially increased. Under poor channel conditions, the use of forward error correction can lead to further improvement.