Performance Analysis of a Generic Cooperative HARQ Algorithm Over Rayleigh Faded Channels
Agota Antal, Vasile Bota · 2018
The relay-assisted Hybrid ARQ technique is regarded as a mean of further improving the coverage and reliability performance of future wireless networks. This paper studies the reliability, spectral efficiency and delay performance of a generic Repetition Redundancy cooperative HARQ (CHARQ) algorithm that uses both the direct source-destination (S-D) link and the source-relay-destination (S-R-D) path, and operates under delay constraint. The analysis is made using practical modulation and channel code over block-faded Rayleigh channels. Its performance is compared to the one provided by a generic HARQ algorithm using only the source-destination link. The results show that CHARQ provides smaller block-error rate (BLER) and ensures target BLER and smaller delay at lower signal-to-noise ratios (SNR) than HARQ, at the expense of smaller spectral efficiency.