In this paper, the effective capacity of cooperative communication (CC)
systems with hybrid Automatic repeat request (HARQ) is derived. The derived
expressions are valid for any channel distribution and with any arbitrary
number of retransmissions by the source and relay for both HARQ-repetition
redundancy (RR) and HARQ-incremental redundancy (IR) over asymmetric channels.
As an example, we use the derived EC expression over Rayleigh fading channels.
Several results are obtained for a low rate and signal-to-noise ratio (SNR). We
can see that the EC attends its maximum value with a small number of
retransmissions. As expected when the relay-destination channel has low SNR, it
is better than the relay does not participate especially when we assign a large
number of transitions at the relay. For high data rates and strict quality of
service (QoS) constraints, it is better to increase the number of relay
transmissions. Finally, when we increase the number of source retransmissions,
the effective capacity improves even for low values.Comment: 30 pages, 6 figure