Throughput Study of Cooperative Diversity System Based on Truncated ARQ Protocol
Jiayin Qin · Dianzi xuebao · 2007
In this paper,the throughput of a cooperative diversity communication system based on truncated ARQ protocol is studied.The theoretical throughput expressions of cooperative diversity and two-hop systems are derived.According to the expressions,throughput is affected by the MAC layer parameter data packet length L and physical layer parameter modulation level b,so cross-layer design can be used for throughput optimization.By assuming that L and b are continuous variables,the maximum throughput is evaluated by two-dimension(2-D) continuous optimization algorithms.Then a 2-D discrete optimization algorithm is proposed to find the maximum throughput,which is practical for applications.Furthermore,with the knowledge of signal-to-noise ratio(SNR) information,the 2-D algorithm is simplified into a 1-D algorithm.The 1-D discrete algorithm has only a little performance loss compared with the 2-D algorithm.