Improved Intracluster Cooperation Schemes in Wireless Multicast Systems
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Through the direct communication between users cooperative retransmission has been considered as an effective scheme to solve the problem of packet loss in wireless multicast systems. Focusing on the retransmission energy consumption in the existed intracluster cooperation scheme, two improved intracluster cooperation schemes are proposed in this paper. Firstly, diversity technique is applied to the intracluster cooperation scheme, and a new intracluster cooperation scheme based on transmit diversity is proposed. In the proposed scheme, each user combines the signals from multiple retransmitter to reduce the signal attenuation caused by Rayleigh fading. Secondly, by using network coding in intracluster cooperation scheme, the intracluster cooperation scheme based on network coding is proposed. In the proposed schemes, in order to improve the transmission efficiency, the transmitters of each group encode the packets to be sent by using XOR-based network coding (XOR-NC) or random linear network coding (RLNC). Simulations show that the proposed schemes have lower energy consumption than the original group cooperation scheme.
KeywordsWireless multicast User cooperation Transmit diversity Network coding
Funding was provided by The National Natural Science Foundation of China (Grant No. 61571340) and The Program of Introducing Talents of Discipline to Universities (Grant No. B08038).
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