摘要
针对FSO/RF混合链路在雾天强湍流信道环境下的数据可靠传输问题,研究三种不同合并策略下混合自动请求重传(HARQ)方案的中断概率和吞吐量性能。在K分布强湍流信道条件下,采用高斯随机变量的近似方法对单次合并、最大比合并、增量冗余合并三种HARQ协议的性能进行理论计算分析。数值计算结果表明,在雾天强湍流信道条件下,采用增量冗余HARQ协议的系统性能明显优于单次合并、最大比合并方案,通过调整初始码率和重传次数,可显著降低系统中断概率,从而提高FSO/RF混合系统在恶劣环境下数据传输的可靠性。
Aiming at the reliability problem of hybrid FSO/RF system under fog and strong turbulence channel conditions,the outage probability and throughput were investigated theoretically with three different kinds of hybrid automatic repeat request(HARQ)protocols.Their outage probability and throughput performance were calculated and analyzed over strong atmospheric turbulence channel model with K distribution by using Gaussian random variable.The numerical results show that,in the case of fog and strong turbulent conditions,the HARQ with incremental redundancy combination can have obviously better performance than the at least once and maximum ratio combination schemes.The outage probability can be significantly reduced by adjusting the initial bit rate and the number of retransmissions.Therefore,the HARQ protocol with incremental redundancy combination can ensure the reliability of hybrid FSO/RF communication under adverse weather conditions.
作者
邵军虎
孙莹
刘晓楠
周林
SHAO Junhu;SUN Ying;LIU Xiaonan;ZHOU Lin(Faculty of Automation and Information Engineering,Xi'an University of Technology,Xi'an,710048,China;Xiamen Key Laboratory of Mobile Multimedia Communications,Huaqiao University,Xiamen Fujian 361021,China)
出处
《激光杂志》
北大核心
2019年第6期162-166,共5页
Laser Journal
基金
国家自然科学基金(No.61405157,No.61377080)
陕西省自然科学基础研究计划资助项目(No.2017JM6070)
陕西省教育厅科研计划项目资助(No.17JK0575)
陕西省重点产业创新链项目(No.2017ZDCXL-GY-05-03)
厦门市移动多媒体通信重点实验室(华侨大学)开放基金资助(HQUCOM17-02)
关键词
自由空间光通信
混合FSO/RF
混合自动请求重传
中断概率
增量冗余
free-space optical communication
hybrid FSO/RF
hybrid automatic repeat request
outage probability
incremental redundancy
