摘要
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。
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.
出处
《南京邮电大学学报（自然科学版）》
北大核心
2014年第6期9-14,21,共7页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
国家自然科学基金(61372125
61401234)
江苏省科技支撑计划(工业)(BE2013019)
江苏省高校自然科学基础研究重大项目(10KJA510037)
南京邮电大学宽带无线通信与传感网技术教育部重点实验室开放研究基金(NYKL201108)
江苏高校优势学科建设工程资助项目
关键词
网络编码
自动重传
无线广播
吞吐量
network coding
automatic repeat request
wireless broadcast
throughput
