摘要
由于卫星通信传输时延大,因此误码造成丢帧后,增加的传输时间严重影响卫星通信。针对卫星通信普遍采用的卫星数字视频传输协议(DVB_S),通过比较分析自动重传(ARQ)、选择性重传(SR_ARQ)和主动性重传(CA_ARQ)3种重传机制的误码率与丢帧率的关系,给出了3种情况的理论延时性能,理论推导和仿真结果都表明CA_ARQ重传机制性能最为稳定,延时最小,更加适合卫星信道应用。
Because the transmission time-delay of satellite communication is long,the increased transmission time will effect heavily satellite communication after the loss of frames caused by BER.For DVB-S protocol adopted by satellite communication,this paper compares and analyzes the relationship among ARQ,SR-ARQ and CA-ARQ,gives the theoretic time-delay evaluations in the three mechanisms.The theoretic derivation and data simulation show that the CA-ARQ has the steadiest performance,the least of time-delay,and is more conformable to satellite channel.
出处
《无线电通信技术》
2010年第6期30-32,共3页
Radio Communications Technology
关键词
误码率
丢帧率
重传机制
传输时延
bit error rate
frame-loss-ratio
retransmission mechanism
transmission time-delay
