为解决无人机协作通信中的数据时延问题,将复数域网络编码(complex field network coding, CFNC)引入到协作通信中。针对无人机工作时视距与非视距2种典型场景,提出2种适用于无人机网络的部分连通拓扑结构。将CFNC应用到上述无人机网络...为解决无人机协作通信中的数据时延问题,将复数域网络编码(complex field network coding, CFNC)引入到协作通信中。针对无人机工作时视距与非视距2种典型场景,提出2种适用于无人机网络的部分连通拓扑结构。将CFNC应用到上述无人机网络中,推导基于CFNC的信息传递方案,理论分析结果表明该方案可大幅度提高数据吞吐量性能。最后将CFNC与"RA+BPSK"无人机数据链信号传输体制相结合。基于MATLAB软件的仿真结果表明:CFNC中继方式可以充分获得空间分集增益,相同参数的RA+BPSK+CFNC信号在所提结构中的误符号率明显优于全联通结构。展开更多
Wireless relay and network coding are two critical techniques to increase the reliability and throughput of wireless cooperative communication systems. In this paper, a complex field network coding （CFNC） scheme wit...Wireless relay and network coding are two critical techniques to increase the reliability and throughput of wireless cooperative communication systems. In this paper, a complex field network coding （CFNC） scheme with the K-th best relay selection （KBS） is proposed and investigated, wherein the K-th best relay is selected to forward the multiplexed signal to the destination. First, the upper bound of the symbol error probability （SEP）, the diversity order, and the coding gain are derived for the CFNC scheme with KBS. Then, the coding gain is utilized as the optimized cri- terion to determine the optimal power allocation. It is validated through analysis and simulation that the CFNC scheme with KBS can achieve full diversity only when K=I, while the diversity order decreases with increasing parameter K, and the optimal power allocation can significantly improve the performance of the CFNC scheme with KBS.展开更多
提出了一种正交频分复用(orthogonal frequency division multiplex,OFDM)技术与协作复数域网络编码有机结合的OFDM-协作复数域网络编码(OFDM-cooperative complex field network coding,OFDM-CCFNC)算法。理论分析了该算法的系统误帧...提出了一种正交频分复用(orthogonal frequency division multiplex,OFDM)技术与协作复数域网络编码有机结合的OFDM-协作复数域网络编码(OFDM-cooperative complex field network coding,OFDM-CCFNC)算法。理论分析了该算法的系统误帧率和频谱利用率,仿真结果表明,该算法能够克服无线信道的频率选择性衰落影响,提高系统频谱利用率。另外,基于最小化系统误帧率给出了该算法下的一种最优系统功率分配策略。展开更多
针对卫星通信网络吞吐量不足、可靠性不高的问题,提出一种基于复数域网络编码(Complex Field Network Coding,CFNC)的卫星通信方案。该方案在信号发送前对源信息作预编码处理,即在复数域上选取一个大小合适的参数化空时码与源信号相乘,...针对卫星通信网络吞吐量不足、可靠性不高的问题,提出一种基于复数域网络编码(Complex Field Network Coding,CFNC)的卫星通信方案。该方案在信号发送前对源信息作预编码处理,即在复数域上选取一个大小合适的参数化空时码与源信号相乘,编码后的信号与源信号在复数域上有着一一映射关系。对该方案的吞吐量和成对差错概率(Pairwise Error Probability,PEP)做了详尽的理论分析,结果表明,采用该编码方案的卫星通信系统在终端发射功率不变的情况下,吞吐量比路由模式提高了100%以上,比传统的CFNC方式至少可提高75%。该方案还可以扩展至更多的地面源节点,从而支持多用户网络通信。最后,仿真实验表明,在较高的信噪比下,PEP仿真值逼近于渐近值,验证了理论分析的正确性。展开更多
文摘为解决无人机协作通信中的数据时延问题,将复数域网络编码(complex field network coding, CFNC)引入到协作通信中。针对无人机工作时视距与非视距2种典型场景,提出2种适用于无人机网络的部分连通拓扑结构。将CFNC应用到上述无人机网络中,推导基于CFNC的信息传递方案,理论分析结果表明该方案可大幅度提高数据吞吐量性能。最后将CFNC与"RA+BPSK"无人机数据链信号传输体制相结合。基于MATLAB软件的仿真结果表明:CFNC中继方式可以充分获得空间分集增益,相同参数的RA+BPSK+CFNC信号在所提结构中的误符号率明显优于全联通结构。
基金supported by the Major State Basic Research Development Program of China(973 Program No.2012CB316100)the National Natural Science Foundation of China(Nos.61032002/61271246)the 111 Project(No.111-2-14)
文摘Wireless relay and network coding are two critical techniques to increase the reliability and throughput of wireless cooperative communication systems. In this paper, a complex field network coding （CFNC） scheme with the K-th best relay selection （KBS） is proposed and investigated, wherein the K-th best relay is selected to forward the multiplexed signal to the destination. First, the upper bound of the symbol error probability （SEP）, the diversity order, and the coding gain are derived for the CFNC scheme with KBS. Then, the coding gain is utilized as the optimized cri- terion to determine the optimal power allocation. It is validated through analysis and simulation that the CFNC scheme with KBS can achieve full diversity only when K=I, while the diversity order decreases with increasing parameter K, and the optimal power allocation can significantly improve the performance of the CFNC scheme with KBS.
文摘提出了一种正交频分复用(orthogonal frequency division multiplex,OFDM)技术与协作复数域网络编码有机结合的OFDM-协作复数域网络编码(OFDM-cooperative complex field network coding,OFDM-CCFNC)算法。理论分析了该算法的系统误帧率和频谱利用率,仿真结果表明,该算法能够克服无线信道的频率选择性衰落影响,提高系统频谱利用率。另外,基于最小化系统误帧率给出了该算法下的一种最优系统功率分配策略。
