IR-HARQ vs. Joint Channel-Network coding for Cooperative Wireless Communication
Mohamed S. AbuZeid, Yasmine A. H. Fahmy, Magdy S. El-Soudani · 2011
Abstract—Wireless communication systems demand the use of many coding techniques for data retransmission between sending and receiving end points to achieve the required system capacity over variant channel conditions. Different developed techniques are introduced such as channel coding, network coding and joint coding to achieve this target. As an improvement for wireless communication systems, cooperative wireless communication is illustrated to increase system throughput and enhance system capacity. This paper investigates different data retransmission schemes in cooperative wireless communication systems scenario. More specifically, two considered techniques are compared, Incremental redundancy Hybrid Automatic repeat Request (IR-HARQ) and joint Channel Network coding (NC-HARQ) from throughput and complexity perceptions. The system throughput is derived in both cases to compare the advantages and disadvantages for each technique. Simulations are conducted for different number of end-point receivers to confirm obtained results persistence and trends. Both simulations and theoretical analysis confirm the advantages of the IR-HARQ over the NC-HARQ. Higher throughput and better system capacity is introduced using IR-HARQ when it is compared with NC-HARQ, in addition to decreasing retransmission complexity.