一种基于并行网络编码的无线广播重传方案

重传能够保证接收端正确地接收到数据,研究表明传统的多播重传机制会导致较低的传输效率.为了在无线广播网络中减少重传的次数,提出了一种基于并行机会式网络编码重传方案,运用并行机制,采用机会式网络编码组合不同的丢失包进行重传,其中机会网络编码重传方案大大减少了重传次数,而并行机制降低了算法复杂度.理论和实验分析说明,该方案在平均吞吐量、平均发送重传次数和平均接收重传次数等性能指标上远远好于传统重传方案,这进一步验证了基于并行网络编码机制的重传方案是有效的,即在降低复杂度的前提下能够大大减少重传次数,从而增加系统的吞吐量.

Wireless Broadcast Retransmission Scheme Based on Parallel Network Coding

The wireless broadcast retransmission scheme is presented to improve the receiving probability of the receiver. Previous studies show that the traditional wireless broadcast retransmission schemes are invalid. In order to improve the retransmission efficiency in wireless broadcast scenario, a parallel network coded retransmission scheme is proposed by using the parallel mechanism to combine the lost packets for retransmission. The network coded retransmission scheme can effectively reduce the retransmissions, and the parallel mechanism can further reduce the complexity of network coding. Theoretical analysis and simulation results show that the suggested scheme can reduce the average retransmission times and improve the average throughput of the wireless broadcast system compared with the existing approaches, thus improving the efficiency of the proposed scheme.